How can I generate an MD5 hash

Question

Is there any method to generate MD5 hash of a string in Java

User · Answer

My not very revealing answer   private String md5 String s        try           MessageDigest m   MessageDigest getInstance  MD5            m update s getBytes    0  s length             BigInteger i   new BigInteger 1 m digest             return String format   1 032x   i                  catch  NoSuchAlgorithmException e            e printStackTrace              return null

User · Answer

If you actually want the answer back as a string as opposed to a byte array  you could always do something like this   String plaintext    your text here   MessageDigest m   MessageDigest getInstance  MD5    m reset    m update plaintext getBytes     byte   digest   m digest    BigInteger bigInt   new BigInteger 1 digest   String hashtext   bigInt toString 16      Now we need to zero pad it if you actually want the full 32 chars  while hashtext length    lt  32      hashtext    0  hashtext

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private String hashuj String dane  throws ServletException      try           MessageDigest m   MessageDigest getInstance  MD5            byte   bufor   dane getBytes            m update bufor 0 bufor length           BigInteger hash   new BigInteger 1 m dige enter code here st             return String format   1 032X   hash          catch  NoSuchAlgorithmException nsae            throw new ServletException  Algorytm szyfrowania nie jest obslugiwany

User · Answer

You could try using Caesar  First option  byte   hash       new Hash          new ImmutableMessageDigest              MessageDigest getInstance  quot MD5 quot                      new PlainText  quot String to hash    quot         asArray     Second option  byte   hash       new ImmutableMessageDigest          MessageDigest getInstance  quot MD5 quot         update          new PlainText  quot String to hash    quot         digest

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You might also want to look at the DigestUtils class of the apache commons codec project  which provides very convenient methods to create MD5 or SHA digests

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I know  that the question is about Java  but I would like to list here an ActionScript 1 source code  here the license  to generate MD5 in a different way than the answers listed at this page   The function below works well and could surely be converted to Java      MD5 implementation from http   www webtoolkit info     function md5 string         function RotateLeft lValue  iShiftBits            return  lValue lt  lt iShiftBits     lValue gt  gt  gt  32-iShiftBits               function AddUnsigned lX lY            var lX4 lY4 lX8 lY8 lResult          lX8    lX  amp  0x80000000           lY8    lY  amp  0x80000000           lX4    lX  amp  0x40000000           lY4    lY  amp  0x40000000           lResult    lX  amp  0x3FFFFFFF   lY  amp  0x3FFFFFFF           if  lX4  amp  lY4                return  lResult   0x80000000   lX8   lY8                     if  lX4   lY4                if  lResult  amp  0x40000000                    return  lResult   0xC0000000   lX8   lY8                 else                   return  lResult   0x40000000   lX8   lY8                           else               return  lResult   lX8   lY8                        function F x y z    return  x  amp  y       x   amp  z         function G x y z    return  x  amp  z     y  amp    z          function H x y z    return  x   y   z         function I x y z    return  y    x     z            function FF a b c d x s ac            a   AddUnsigned a  AddUnsigned AddUnsigned F b  c  d   x   ac            return AddUnsigned RotateLeft a  s   b               function GG a b c d x s ac            a   AddUnsigned a  AddUnsigned AddUnsigned G b  c  d   x   ac            return AddUnsigned RotateLeft a  s   b               function HH a b c d x s ac            a   AddUnsigned a  AddUnsigned AddUnsigned H b  c  d   x   ac            return AddUnsigned RotateLeft a  s   b               function II a b c d x s ac            a   AddUnsigned a  AddUnsigned AddUnsigned I b  c  d   x   ac            return AddUnsigned RotateLeft a  s   b               function ConvertToWordArray string            var lWordCount          var lMessageLength   string length          var lNumberOfWords temp1 lMessageLength   8          var lNumberOfWords temp2  lNumberOfWords temp1- lNumberOfWords temp1   64   64          var lNumberOfWords    lNumberOfWords temp2 1  16          var lWordArray Array lNumberOfWords-1           var lBytePosition   0          var lByteCount   0          while   lByteCount  lt  lMessageLength                 lWordCount    lByteCount- lByteCount   4   4              lBytePosition    lByteCount   4  8              lWordArray lWordCount     lWordArray lWordCount                      string charCodeAt lByteCount  lt  lt lBytePosition                lByteCount                      lWordCount    lByteCount- lByteCount   4   4          lBytePosition    lByteCount   4  8          lWordArray lWordCount    lWordArray lWordCount     0x80 lt  lt lBytePosition           lWordArray lNumberOfWords-2    lMessageLength lt  lt 3          lWordArray lNumberOfWords-1    lMessageLength gt  gt  gt 29          return lWordArray              function WordToHex lValue            var WordToHexValue    WordToHexValue temp    lByte lCount          for  lCount   0 lCount lt  3 lCount                  lByte    lValue gt  gt  gt  lCount 8    amp  255              WordToHexValue temp    0    lByte toString 16               WordToHexValue   WordToHexValue                    WordToHexValue temp substr WordToHexValue temp length-2 2                     return WordToHexValue              function Utf8Encode string             var utftext                for  var n   0  n  lt  string length  n                   var c   string charCodeAt n                if  c  lt  128                    utftext    String fromCharCode c                             else if  c  gt  127   amp  amp   c  lt  2048                     utftext    String fromCharCode  c  gt  gt  6    192                   utftext    String fromCharCode  c  amp  63    128                             else                   utftext    String fromCharCode  c  gt  gt  12    224                   utftext    String fromCharCode   c  gt  gt  6   amp  63    128                   utftext    String fromCharCode  c  amp  63    128                                     return utftext              var x Array        var k AA BB CC DD a b c d      var S11 7  S12 12  S13 17  S14 22      var S21 5  S22 9   S23 14  S24 20      var S31 4  S32 11  S33 16  S34 23      var S41 6  S42 10  S43 15  S44 21       string   Utf8Encode string        x   ConvertToWordArray string        a   0x67452301  b   0xEFCDAB89  c   0x98BADCFE  d   0x10325476       for  k 0 k lt x length k  16            AA a  BB b  CC c  DD d          a FF a b c d x k 0   S11 0xD76AA478           d FF d a b c x k 1   S12 0xE8C7B756           c FF c d a b x k 2   S13 0x242070DB           b FF b c d a x k 3   S14 0xC1BDCEEE           a FF a b c d x k 4   S11 0xF57C0FAF           d FF d a b c x k 5   S12 0x4787C62A           c FF c d a b x k 6   S13 0xA8304613           b FF b c d a x k 7   S14 0xFD469501           a FF a b c d x k 8   S11 0x698098D8           d FF d a b c x k 9   S12 0x8B44F7AF           c FF c d a b x k 10  S13 0xFFFF5BB1           b FF b c d a x k 11  S14 0x895CD7BE           a FF a b c d x k 12  S11 0x6B901122           d FF d a b c x k 13  S12 0xFD987193           c FF c d a b x k 14  S13 0xA679438E           b FF b c d a x k 15  S14 0x49B40821           a GG a b c d x k 1   S21 0xF61E2562           d GG d a b c x k 6   S22 0xC040B340           c GG c d a b x k 11  S23 0x265E5A51           b GG b c d a x k 0   S24 0xE9B6C7AA           a GG a b c d x k 5   S21 0xD62F105D           d GG d a b c x k 10  S22 0x2441453           c GG c d a b x k 15  S23 0xD8A1E681           b GG b c d a x k 4   S24 0xE7D3FBC8           a GG a b c d x k 9   S21 0x21E1CDE6           d GG d a b c x k 14  S22 0xC33707D6           c GG c d a b x k 3   S23 0xF4D50D87           b GG b c d a x k 8   S24 0x455A14ED           a GG a b c d x k 13  S21 0xA9E3E905           d GG d a b c x k 2   S22 0xFCEFA3F8           c GG c d a b x k 7   S23 0x676F02D9           b GG b c d a x k 12  S24 0x8D2A4C8A           a HH a b c d x k 5   S31 0xFFFA3942           d HH d a b c x k 8   S32 0x8771F681           c HH c d a b x k 11  S33 0x6D9D6122           b HH b c d a x k 14  S34 0xFDE5380C           a HH a b c d x k 1   S31 0xA4BEEA44           d HH d a b c x k 4   S32 0x4BDECFA9           c HH c d a b x k 7   S33 0xF6BB4B60           b HH b c d a x k 10  S34 0xBEBFBC70           a HH a b c d x k 13  S31 0x289B7EC6           d HH d a b c x k 0   S32 0xEAA127FA           c HH c d a b x k 3   S33 0xD4EF3085           b HH b c d a x k 6   S34 0x4881D05           a HH a b c d x k 9   S31 0xD9D4D039           d HH d a b c x k 12  S32 0xE6DB99E5           c HH c d a b x k 15  S33 0x1FA27CF8           b HH b c d a x k 2   S34 0xC4AC5665           a II a b c d x k 0   S41 0xF4292244           d II d a b c x k 7   S42 0x432AFF97           c II c d a b x k 14  S43 0xAB9423A7           b II b c d a x k 5   S44 0xFC93A039           a II a b c d x k 12  S41 0x655B59C3           d II d a b c x k 3   S42 0x8F0CCC92           c II c d a b x k 10  S43 0xFFEFF47D           b II b c d a x k 1   S44 0x85845DD1           a II a b c d x k 8   S41 0x6FA87E4F           d II d a b c x k 15  S42 0xFE2CE6E0           c II c d a b x k 6   S43 0xA3014314           b II b c d a x k 13  S44 0x4E0811A1           a II a b c d x k 4   S41 0xF7537E82           d II d a b c x k 11  S42 0xBD3AF235           c II c d a b x k 2   S43 0x2AD7D2BB           b II b c d a x k 9   S44 0xEB86D391           a AddUnsigned a AA           b AddUnsigned b BB           c AddUnsigned c CC           d AddUnsigned d DD              var temp   WordToHex a  WordToHex b  WordToHex c  WordToHex d        return temp toLowerCase

User · Answer

You need java security MessageDigest   Call MessageDigest getInstance  MD5   to get a MD5 instance of MessageDigest you can use   The compute the hash by doing one of    Feed the entire input as a byte   and calculate the hash in one operation with md digest bytes   Feed the MessageDigest one byte   chunk at a time by calling md update bytes   When you re done adding input bytes  calculate the hash with  md digest      The byte   returned by md digest   is the MD5 hash

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This is what I came here for- a handy scala function that returns string of MD5 hash    def md5 text  String    String   java security MessageDigest getInstance  MD5   digest text getBytes    map 0xFF  amp     map     02x  format      foldLeft

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Bombe s answer is correct  however note that unless you absolutely must use MD5  e g  forced on you for interoperability   a better choice is SHA1 as MD5 has weaknesses for long term use   I should add that SHA1 also has theoretical vulnerabilities  but not as severe  The current state of the art in hashing is that there are a number of candidate replacement hash functions but none have yet emerged as the standard best practice to replace SHA1  So  depending on your needs you would be well advised to make your hash algorithm configurable so it can be replaced in future

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Found this   public String MD5 String md5       try           java security MessageDigest md   java security MessageDigest getInstance  MD5            byte   array   md digest md5 getBytes             StringBuffer sb   new StringBuffer            for  int i   0  i  lt  array length    i              sb append Integer toHexString  array i   amp  0xFF    0x100  substring 1 3                     return sb toString          catch  java security NoSuchAlgorithmException e              return null      on the site below  I take no credit for it  but its a solution that works  For me lots of other code didnt work properly  I ended up missing 0s in the hash  This one seems to be the same as PHP has  source  http   m2tec be blog 2010 02 03 java-md5-hex-0093

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If you actually want the answer back as a string as opposed to a byte array  you could always do something like this   String plaintext    your text here   MessageDigest m   MessageDigest getInstance  MD5    m reset    m update plaintext getBytes     byte   digest   m digest    BigInteger bigInt   new BigInteger 1 digest   String hashtext   bigInt toString 16      Now we need to zero pad it if you actually want the full 32 chars  while hashtext length    lt  32      hashtext    0  hashtext

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MD5 is perfectly fine if you don t need the best security  and if you re doing something like checking file integrity then security is not a consideration   In such as case you might want to consider something simpler and faster  such as Adler32  which is also supported by the Java libraries

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No need to make it too complicated  DigestUtils works fine and makes you comfortable while working with md5 hashes   DigestUtils md5Hex  hash     or  DigestUtils md5  hash     Either you can use any other encryption methods such as sha or md

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I ve found this to be the most clear and concise way to do it   MessageDigest md5   MessageDigest getInstance  MD5    md5 update StandardCharsets UTF 8 encode string    return String format   032x   new BigInteger 1  md5 digest

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Unlike PHP where you can do an MD5 hashing of your text by just calling md5 function ie md5  text   in Java it was made little bit complicated  I usually implemented it by calling a function which returns the md5 hash text   Here is how I implemented it  First create a function named md5hashing inside your main class as given below    public static String md5hashing String text          String hashtext   null          try                        String plaintext   text              MessageDigest m   MessageDigest getInstance  MD5                m reset                m update plaintext getBytes                 byte   digest   m digest                BigInteger bigInt   new BigInteger 1 digest               hashtext   bigInt toString 16                  Now we need to zero pad it if you actually want the full 32 chars              while hashtext length    lt  32                  hashtext    0  hashtext                             catch  Exception e1                            TODO  handle exception             JOptionPane showMessageDialog null e1 getClass   getName            e1 getMessage                          return hashtext               Now call the function whenever you needed as given below   String text   textFieldName getText    String pass   md5hashing text     Here you can see that hashtext is appended with a zero to make it match with md5 hashing in PHP

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Bombe s answer is correct  however note that unless you absolutely must use MD5  e g  forced on you for interoperability   a better choice is SHA1 as MD5 has weaknesses for long term use   I should add that SHA1 also has theoretical vulnerabilities  but not as severe  The current state of the art in hashing is that there are a number of candidate replacement hash functions but none have yet emerged as the standard best practice to replace SHA1  So  depending on your needs you would be well advised to make your hash algorithm configurable so it can be replaced in future

User · Answer

You might also want to look at the DigestUtils class of the apache commons codec project  which provides very convenient methods to create MD5 or SHA digests

User · Answer

No need to make it too complicated  DigestUtils works fine and makes you comfortable while working with md5 hashes   DigestUtils md5Hex  hash     or  DigestUtils md5  hash     Either you can use any other encryption methods such as sha or md

User · Answer

You could try using Caesar  First option  byte   hash       new Hash          new ImmutableMessageDigest              MessageDigest getInstance  quot MD5 quot                      new PlainText  quot String to hash    quot         asArray     Second option  byte   hash       new ImmutableMessageDigest          MessageDigest getInstance  quot MD5 quot         update          new PlainText  quot String to hash    quot         digest

User · Answer

You need java security MessageDigest   Call MessageDigest getInstance  MD5   to get a MD5 instance of MessageDigest you can use   The compute the hash by doing one of    Feed the entire input as a byte   and calculate the hash in one operation with md digest bytes   Feed the MessageDigest one byte   chunk at a time by calling md update bytes   When you re done adding input bytes  calculate the hash with  md digest      The byte   returned by md digest   is the MD5 hash

User · Answer

You need java security MessageDigest   Call MessageDigest getInstance  MD5   to get a MD5 instance of MessageDigest you can use   The compute the hash by doing one of    Feed the entire input as a byte   and calculate the hash in one operation with md digest bytes   Feed the MessageDigest one byte   chunk at a time by calling md update bytes   When you re done adding input bytes  calculate the hash with  md digest      The byte   returned by md digest   is the MD5 hash

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The MessageDigest class can provide you with an instance of the MD5 digest   When working with strings and the crypto classes be sure to always specify the encoding you want the byte representation in  If you just use string getBytes   it will use the platform default   Not all platforms use the same defaults   import java security         byte   bytesOfMessage   yourString getBytes  UTF-8     MessageDigest md   MessageDigest getInstance  MD5    byte   thedigest   md digest bytesOfMessage     If you have a lot of data take a look at the  update byte    method which can be called repeatedly  Then call  digest   to obtain the resulting hash

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My not very revealing answer   private String md5 String s        try           MessageDigest m   MessageDigest getInstance  MD5            m update s getBytes    0  s length             BigInteger i   new BigInteger 1 m digest             return String format   1 032x   i                  catch  NoSuchAlgorithmException e            e printStackTrace              return null

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You can try following  See details and download codes here  http   jkssweetlife com java-hashgenerator-md5-sha-1   import java security MessageDigest  import java security NoSuchAlgorithmException   public class MD5Example    public static void main String   args  throws Exception        final String inputString    Hello MD5        System out println  MD5 hex for      inputString               System out println getMD5Hex inputString       public static String getMD5Hex final String inputString  throws NoSuchAlgorithmException        MessageDigest md   MessageDigest getInstance  MD5        md update inputString getBytes          byte   digest   md digest         return convertByteToHex digest      private static String convertByteToHex byte   byteData         StringBuilder sb   new StringBuilder        for  int i   0  i  lt  byteData length  i              sb append Integer toString  byteData i   amp  0xff    0x100  16  substring 1               return sb toString

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You can generate MD5 hash for a given text by making use of the methods in the MessageDigest class in the java security package  Below is the complete code snippet   import java security MessageDigest  import java security NoSuchAlgorithmException  import javax xml bind DatatypeConverter   public class MD5HashGenerator        public static void main String args    throws NoSuchAlgorithmException             String stringToHash    MyJavaCode           MessageDigest messageDigest   MessageDigest getInstance  MD5           messageDigest update stringToHash getBytes            byte   digiest   messageDigest digest           String hashedOutput   DatatypeConverter printHexBinary digiest          System out println hashedOutput            The output from the MD5 function is a 128 bit hash represented by 32 hexadecimal numbers   In case  if you are using a database like MySQL  you can do this in a more simpler way as well  The query Select MD5    text here     will return the MD5 hash of the text in the bracket

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The MessageDigest class can provide you with an instance of the MD5 digest   When working with strings and the crypto classes be sure to always specify the encoding you want the byte representation in  If you just use string getBytes   it will use the platform default   Not all platforms use the same defaults   import java security         byte   bytesOfMessage   yourString getBytes  UTF-8     MessageDigest md   MessageDigest getInstance  MD5    byte   thedigest   md digest bytesOfMessage     If you have a lot of data take a look at the  update byte    method which can be called repeatedly  Then call  digest   to obtain the resulting hash

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Another implementation  Fast MD5 Implementation in Java  String hash   MD5 asHex MD5 getHash new File filename

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Take a look at the following link  the Example gets an MD5 Hash of a supplied image  MD5 Hash of an Image

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You can try following  See details and download codes here  http   jkssweetlife com java-hashgenerator-md5-sha-1   import java security MessageDigest  import java security NoSuchAlgorithmException   public class MD5Example    public static void main String   args  throws Exception        final String inputString    Hello MD5        System out println  MD5 hex for      inputString               System out println getMD5Hex inputString       public static String getMD5Hex final String inputString  throws NoSuchAlgorithmException        MessageDigest md   MessageDigest getInstance  MD5        md update inputString getBytes          byte   digest   md digest         return convertByteToHex digest      private static String convertByteToHex byte   byteData         StringBuilder sb   new StringBuilder        for  int i   0  i  lt  byteData length  i              sb append Integer toString  byteData i   amp  0xff    0x100  16  substring 1               return sb toString

User · Answer

MD5 is perfectly fine if you don t need the best security  and if you re doing something like checking file integrity then security is not a consideration   In such as case you might want to consider something simpler and faster  such as Adler32  which is also supported by the Java libraries

User · Answer

MD5 is perfectly fine if you don t need the best security  and if you re doing something like checking file integrity then security is not a consideration   In such as case you might want to consider something simpler and faster  such as Adler32  which is also supported by the Java libraries

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Another option is to use the Guava Hashing methods   Hasher hasher   Hashing md5   newHasher    hasher putString  my string    byte   md5   hasher hash   asBytes      Handy if you are already using Guava  which if you re not  you probably should be

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I have a Class  Hash  to convert plain text in hash in formats  md5 or sha1  simillar that php functions  md5  sha1    public class Hash                           param txt  text in plain format         param hashType MD5 OR SHA1         return hash in hashType              public static String getHash String txt  String hashType            try                       java security MessageDigest md   java security MessageDigest getInstance hashType                       byte   array   md digest txt getBytes                         StringBuffer sb   new StringBuffer                        for  int i   0  i  lt  array length    i                            sb append Integer toHexString  array i   amp  0xFF    0x100  substring 1 3                                           return sb toString                  catch  java security NoSuchAlgorithmException e                      error action                           return null             public static String md5 String txt            return Hash getHash txt   MD5               public static String sha1 String txt            return Hash getHash txt   SHA1              Testing with JUnit and PHP  PHP Script    lt  php  echo  MD5      md5  Hello World       n   echo  SHA1     sha1  Hello World       n     Output PHP script   MD5  b10a8db164e0754105b7a99be72e3fe5 SHA1 0a4d55a8d778e5022fab701977c5d840bbc486d0   Using example and Testing with JUnit       public class HashTest         Test     public void test             String txt    Hello World           assertEquals  b10a8db164e0754105b7a99be72e3fe5   Hash md5 txt            assertEquals  0a4d55a8d778e5022fab701977c5d840bbc486d0   Hash sha1 txt               Code in GitHub     https   github com fitorec java-hashes

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Unlike PHP where you can do an MD5 hashing of your text by just calling md5 function ie md5  text   in Java it was made little bit complicated  I usually implemented it by calling a function which returns the md5 hash text   Here is how I implemented it  First create a function named md5hashing inside your main class as given below    public static String md5hashing String text          String hashtext   null          try                        String plaintext   text              MessageDigest m   MessageDigest getInstance  MD5                m reset                m update plaintext getBytes                 byte   digest   m digest                BigInteger bigInt   new BigInteger 1 digest               hashtext   bigInt toString 16                  Now we need to zero pad it if you actually want the full 32 chars              while hashtext length    lt  32                  hashtext    0  hashtext                             catch  Exception e1                            TODO  handle exception             JOptionPane showMessageDialog null e1 getClass   getName            e1 getMessage                          return hashtext               Now call the function whenever you needed as given below   String text   textFieldName getText    String pass   md5hashing text     Here you can see that hashtext is appended with a zero to make it match with md5 hashing in PHP

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this one gives the exact md5 as you get from mysql s md5 function or php s md5 functions etc  This is the one I use  you can change according to your needs   public static String md5  String input         try           java security MessageDigest md   java security MessageDigest getInstance  MD5            byte   array   md digest input getBytes   UTF-8              StringBuffer sb   new StringBuffer            for  int i   0  i  lt  array length  i                  sb append  String format    02x   array i                       return sb toString          catch   NoSuchAlgorithmException   UnsupportedEncodingException e            return null

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This is what I came here for- a handy scala function that returns string of MD5 hash    def md5 text  String    String   java security MessageDigest getInstance  MD5   digest text getBytes    map 0xFF  amp     map     02x  format      foldLeft

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Another option is to use the Guava Hashing methods   Hasher hasher   Hashing md5   newHasher    hasher putString  my string    byte   md5   hasher hash   asBytes      Handy if you are already using Guava  which if you re not  you probably should be

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import java security MessageDigest  val digest   MessageDigest getInstance  MD5      Quick MD5 of text val text    MD5 this text   val md5hash1   digest digest text getBytes  map   02x  format     mkString    MD5 of text with updates digest update  MD5   getBytes    digest update  this   getBytes    digest update  text   getBytes    val md5hash2   digest digest   map 0xFF  amp     map   02x  format     mkString    Output println md5hash1     should be the same as     md5hash2

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import java security MessageDigest  val digest   MessageDigest getInstance  MD5      Quick MD5 of text val text    MD5 this text   val md5hash1   digest digest text getBytes  map   02x  format     mkString    MD5 of text with updates digest update  MD5   getBytes    digest update  this   getBytes    digest update  text   getBytes    val md5hash2   digest digest   map 0xFF  amp     map   02x  format     mkString    Output println md5hash1     should be the same as     md5hash2

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You might also want to look at the DigestUtils class of the apache commons codec project  which provides very convenient methods to create MD5 or SHA digests

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There is a DigestUtils class in Spring also   http   static springsource org spring docs 3 0 x javadoc-api org springframework util DigestUtils html  This class contains the method md5DigestAsHex   that does the job

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Bombe s answer is correct  however note that unless you absolutely must use MD5  e g  forced on you for interoperability   a better choice is SHA1 as MD5 has weaknesses for long term use   I should add that SHA1 also has theoretical vulnerabilities  but not as severe  The current state of the art in hashing is that there are a number of candidate replacement hash functions but none have yet emerged as the standard best practice to replace SHA1  So  depending on your needs you would be well advised to make your hash algorithm configurable so it can be replaced in future

User · Answer

You can generate MD5 hash for a given text by making use of the methods in the MessageDigest class in the java security package  Below is the complete code snippet   import java security MessageDigest  import java security NoSuchAlgorithmException  import javax xml bind DatatypeConverter   public class MD5HashGenerator        public static void main String args    throws NoSuchAlgorithmException             String stringToHash    MyJavaCode           MessageDigest messageDigest   MessageDigest getInstance  MD5           messageDigest update stringToHash getBytes            byte   digiest   messageDigest digest           String hashedOutput   DatatypeConverter printHexBinary digiest          System out println hashedOutput            The output from the MD5 function is a 128 bit hash represented by 32 hexadecimal numbers   In case  if you are using a database like MySQL  you can do this in a more simpler way as well  The query Select MD5    text here     will return the MD5 hash of the text in the bracket

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I did this    Seems to work ok - I m sure somebody will point out mistakes though     public final class MD5   public enum SaltOption       BEFORE  AFTER  BOTH  NONE    private static final String ALG    MD5     For conversion to 2-char hex private static final char   digits          0     1     2     3     4     5         6     7     8     9     a     b         c     d     e     f     g     h         i     j     k     l     m     n         o     p     q     r     s     t         u     v     w     x     y     z      private SaltOption opt          Added the SaltOption constructor since everybody    has their own standards when it comes to salting    hashes         This gives the developer the option            param option The salt option to use  BEFORE  AFTER  BOTH or NONE      public MD5 final SaltOption option          TODO  Add Char Encoding options too    I was too lazy      this opt   option                Returns the salted MD5 checksum of the text passed in as an argument         If the salt is an empty byte array - no salt is applied          param txt The text to run through the MD5 algorithm      param salt The salt value in bytes      return The salted MD5 checksum as a  lt code gt byte   lt  code gt      throws NoSuchAlgorithmException     private byte   createChecksum final String txt  final byte   salt  throws NoSuchAlgorithmException       final MessageDigest complete   MessageDigest getInstance ALG       if opt equals SaltOption BEFORE     opt equals SaltOption BOTH             complete update salt             complete update txt getBytes         if opt equals SaltOption AFTER     opt equals SaltOption BOTH             complete update salt             return complete digest                  Returns the salted MD5 checksum of the file passed in as an argument         If the salt is an empty byte array - no salt is applied          param fle The file to run through the MD5 algorithm      param salt The salt value in bytes      return The salted MD5 checksum as a  lt code gt byte   lt  code gt      throws IOException     throws NoSuchAlgorithmException     private byte   createChecksum final File fle  final byte   salt          throws IOException  NoSuchAlgorithmException       final byte   buffer   new byte 1024       final MessageDigest complete   MessageDigest getInstance ALG               if opt equals SaltOption BEFORE     opt equals SaltOption BOTH                 complete update salt                 int numRead      InputStream fis   null      try           fis   new FileInputStream fle           do               numRead   fis read buffer               if  numRead  gt  0                    complete update buffer  0  numRead                           while  numRead    -1         finally       if  fis    null                fis close                                if opt equals SaltOption AFTER     opt equals SaltOption BOTH                 complete update salt                 return complete digest                  Efficiently converts a byte array to its 2 char per byte hex equivalent         This was adapted from JDK code in the Integer class  I just didn t like    having to use substrings once I got the result           param b The byte array to convert     return The converted String  2 chars per byte        private String convertToHex final byte   b        int x      int charPos      int radix      int mask      final char   buf   new char 32       final char   tmp   new char 3       final StringBuilder md5   new StringBuilder        for  int i   0  i  lt  b length  i              x    b i   amp  0xFF    0x100          charPos   32          radix   1  lt  lt  4          mask   radix - 1          do               buf --charPos    digits x  amp  mask               x  gt  gt  gt   4            while  x    0           System arraycopy buf  charPos  tmp  0   32 - charPos            md5 append Arrays copyOfRange tmp  1  3              return md5 toString                  Returns the salted MD5 checksum of the file passed in as an argument          param fle The file you want want to run through the MD5 algorithm      param salt The salt value in bytes     return The salted MD5 checksum as a 2 char per byte HEX  lt code gt String lt  code gt      throws NoSuchAlgorithmException     throws IOException     public String getMD5Checksum final File fle  final byte   salt          throws NoSuchAlgorithmException  IOException       return convertToHex createChecksum fle  salt                  Returns the MD5 checksum of the file passed in as an argument          param fle The file you want want to run through the MD5 algorithm      return The MD5 checksum as a 2 char per byte HEX  lt code gt String lt  code gt      throws NoSuchAlgorithmException     throws IOException     public String getMD5Checksum final File fle          throws NoSuchAlgorithmException  IOException       return convertToHex createChecksum fle  new byte 0                   Returns the salted MD5 checksum of the text passed in as an argument          param txt The text you want want to run through the MD5 algorithm      param salt The salt value in bytes      return The salted MD5 checksum as a 2 char per byte HEX  lt code gt String lt  code gt      throws NoSuchAlgorithmException     throws IOException     public String getMD5Checksum final String txt  final byte   salt          throws NoSuchAlgorithmException       return convertToHex createChecksum txt  salt                  Returns the MD5 checksum of the text passed in as an argument          param txt The text you want want to run through the MD5 algorithm      return The MD5 checksum as a 2 char per byte HEX  lt code gt String lt  code gt      throws NoSuchAlgorithmException     throws IOException     public String getMD5Checksum final String txt          throws NoSuchAlgorithmException        return convertToHex createChecksum txt  new byte 0

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import java math BigInteger   import java security MessageDigest   import java security NoSuchAlgorithmException         MD5 encryption      author Hongten      public class MD5     public static void main String   args         System out println MD5 getMD5  123456                  Use md5 encoded code value          param sInput     clearly       return md5 encrypted password       public static String getMD5 String sInput          String algorithm            if  sInput    null             return  null               try            algorithm   System getProperty  MD5 algorithm    MD5           catch  SecurityException se                MessageDigest md   null       try            md   MessageDigest getInstance algorithm          catch  NoSuchAlgorithmException e             e printStackTrace                byte buffer     sInput getBytes          for  int count   0  count  lt  sInput length    count               md update buffer  0  count               byte bDigest     md digest         BigInteger bi   new BigInteger bDigest        return  bi toString 16           There is an article on Codingkit about that  Check out  http   codingkit com a JAVA 2013 1020 2216 html

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The MessageDigest class can provide you with an instance of the MD5 digest   When working with strings and the crypto classes be sure to always specify the encoding you want the byte representation in  If you just use string getBytes   it will use the platform default   Not all platforms use the same defaults   import java security         byte   bytesOfMessage   yourString getBytes  UTF-8     MessageDigest md   MessageDigest getInstance  MD5    byte   thedigest   md digest bytesOfMessage     If you have a lot of data take a look at the  update byte    method which can be called repeatedly  Then call  digest   to obtain the resulting hash

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I do not know if this is relevant for anyone reading this  but I just had the problem that I wanted to   download a file from a given URL and compare its MD5 to a known value    I wanted to do it with JRE classes only  no Apache Commons or similar   A quick web search did not show me sample code snippets doing both at the same time  only each task separately  Because this requires to read the same file twice  I figured it might be worth the while to write some code which unifies both tasks  calculating the checksum on the fly while downloading the file  This is my result  sorry if it is not perfect Java  but I guess you get the idea anyway    import java io FileOutputStream  import java io IOException  import java math BigInteger  import java net URL  import java nio ByteBuffer  import java nio channels Channels  import java nio channels ReadableByteChannel  import java nio channels WritableByteChannel  import java security DigestOutputStream            new import java security MessageDigest  import java security NoSuchAlgorithmException   void downloadFile String fromURL  String toFile  BigInteger md5      throws IOException  NoSuchAlgorithmException       ReadableByteChannel in   Channels newChannel new URL fromURL  openStream         MessageDigest md5Digest   MessageDigest getInstance  MD5        WritableByteChannel out   Channels newChannel            new FileOutputStream toFile        old         new DigestOutputStream new FileOutputStream toFile   md5Digest        new     ByteBuffer buffer   ByteBuffer allocate 1024   1024       1 MB      while  in read buffer     -1            buffer flip              md5Digest update buffer asReadOnlyBuffer         old         out write buffer           buffer clear               BigInteger md5Actual   new BigInteger 1  md5Digest digest          if    md5Actual equals md5           throw new RuntimeException               MD5 mismatch for file     toFile                  expected     md5 toString 16                   got     md5Actual toString 16

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You might also want to look at the DigestUtils class of the apache commons codec project  which provides very convenient methods to create MD5 or SHA digests

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I just downloaded commons-codec jar and got perfect php like md5  Here is manual   Just import it to your project and use  String Url    your url    System out println  DigestUtils md5Hex  Url        and there you have it

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import java security    import javax xml bind     byte   bytesOfMessage   yourString getBytes  UTF-8    MessageDigest md   MessageDigest getInstance  MD5    byte   bytesOfDigest   md digest bytesOfMessage   String digest   DatatypeConverter printHexBinary bytesOfDigest  toLowerCase

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Found this   public String MD5 String md5       try           java security MessageDigest md   java security MessageDigest getInstance  MD5            byte   array   md digest md5 getBytes             StringBuffer sb   new StringBuffer            for  int i   0  i  lt  array length    i              sb append Integer toHexString  array i   amp  0xFF    0x100  substring 1 3                     return sb toString          catch  java security NoSuchAlgorithmException e              return null      on the site below  I take no credit for it  but its a solution that works  For me lots of other code didnt work properly  I ended up missing 0s in the hash  This one seems to be the same as PHP has  source  http   m2tec be blog 2010 02 03 java-md5-hex-0093

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I know  that the question is about Java  but I would like to list here an ActionScript 1 source code  here the license  to generate MD5 in a different way than the answers listed at this page   The function below works well and could surely be converted to Java      MD5 implementation from http   www webtoolkit info     function md5 string         function RotateLeft lValue  iShiftBits            return  lValue lt  lt iShiftBits     lValue gt  gt  gt  32-iShiftBits               function AddUnsigned lX lY            var lX4 lY4 lX8 lY8 lResult          lX8    lX  amp  0x80000000           lY8    lY  amp  0x80000000           lX4    lX  amp  0x40000000           lY4    lY  amp  0x40000000           lResult    lX  amp  0x3FFFFFFF   lY  amp  0x3FFFFFFF           if  lX4  amp  lY4                return  lResult   0x80000000   lX8   lY8                     if  lX4   lY4                if  lResult  amp  0x40000000                    return  lResult   0xC0000000   lX8   lY8                 else                   return  lResult   0x40000000   lX8   lY8                           else               return  lResult   lX8   lY8                        function F x y z    return  x  amp  y       x   amp  z         function G x y z    return  x  amp  z     y  amp    z          function H x y z    return  x   y   z         function I x y z    return  y    x     z            function FF a b c d x s ac            a   AddUnsigned a  AddUnsigned AddUnsigned F b  c  d   x   ac            return AddUnsigned RotateLeft a  s   b               function GG a b c d x s ac            a   AddUnsigned a  AddUnsigned AddUnsigned G b  c  d   x   ac            return AddUnsigned RotateLeft a  s   b               function HH a b c d x s ac            a   AddUnsigned a  AddUnsigned AddUnsigned H b  c  d   x   ac            return AddUnsigned RotateLeft a  s   b               function II a b c d x s ac            a   AddUnsigned a  AddUnsigned AddUnsigned I b  c  d   x   ac            return AddUnsigned RotateLeft a  s   b               function ConvertToWordArray string            var lWordCount          var lMessageLength   string length          var lNumberOfWords temp1 lMessageLength   8          var lNumberOfWords temp2  lNumberOfWords temp1- lNumberOfWords temp1   64   64          var lNumberOfWords    lNumberOfWords temp2 1  16          var lWordArray Array lNumberOfWords-1           var lBytePosition   0          var lByteCount   0          while   lByteCount  lt  lMessageLength                 lWordCount    lByteCount- lByteCount   4   4              lBytePosition    lByteCount   4  8              lWordArray lWordCount     lWordArray lWordCount                      string charCodeAt lByteCount  lt  lt lBytePosition                lByteCount                      lWordCount    lByteCount- lByteCount   4   4          lBytePosition    lByteCount   4  8          lWordArray lWordCount    lWordArray lWordCount     0x80 lt  lt lBytePosition           lWordArray lNumberOfWords-2    lMessageLength lt  lt 3          lWordArray lNumberOfWords-1    lMessageLength gt  gt  gt 29          return lWordArray              function WordToHex lValue            var WordToHexValue    WordToHexValue temp    lByte lCount          for  lCount   0 lCount lt  3 lCount                  lByte    lValue gt  gt  gt  lCount 8    amp  255              WordToHexValue temp    0    lByte toString 16               WordToHexValue   WordToHexValue                    WordToHexValue temp substr WordToHexValue temp length-2 2                     return WordToHexValue              function Utf8Encode string             var utftext                for  var n   0  n  lt  string length  n                   var c   string charCodeAt n                if  c  lt  128                    utftext    String fromCharCode c                             else if  c  gt  127   amp  amp   c  lt  2048                     utftext    String fromCharCode  c  gt  gt  6    192                   utftext    String fromCharCode  c  amp  63    128                             else                   utftext    String fromCharCode  c  gt  gt  12    224                   utftext    String fromCharCode   c  gt  gt  6   amp  63    128                   utftext    String fromCharCode  c  amp  63    128                                     return utftext              var x Array        var k AA BB CC DD a b c d      var S11 7  S12 12  S13 17  S14 22      var S21 5  S22 9   S23 14  S24 20      var S31 4  S32 11  S33 16  S34 23      var S41 6  S42 10  S43 15  S44 21       string   Utf8Encode string        x   ConvertToWordArray string        a   0x67452301  b   0xEFCDAB89  c   0x98BADCFE  d   0x10325476       for  k 0 k lt x length k  16            AA a  BB b  CC c  DD d          a FF a b c d x k 0   S11 0xD76AA478           d FF d a b c x k 1   S12 0xE8C7B756           c FF c d a b x k 2   S13 0x242070DB           b FF b c d a x k 3   S14 0xC1BDCEEE           a FF a b c d x k 4   S11 0xF57C0FAF           d FF d a b c x k 5   S12 0x4787C62A           c FF c d a b x k 6   S13 0xA8304613           b FF b c d a x k 7   S14 0xFD469501           a FF a b c d x k 8   S11 0x698098D8           d FF d a b c x k 9   S12 0x8B44F7AF           c FF c d a b x k 10  S13 0xFFFF5BB1           b FF b c d a x k 11  S14 0x895CD7BE           a FF a b c d x k 12  S11 0x6B901122           d FF d a b c x k 13  S12 0xFD987193           c FF c d a b x k 14  S13 0xA679438E           b FF b c d a x k 15  S14 0x49B40821           a GG a b c d x k 1   S21 0xF61E2562           d GG d a b c x k 6   S22 0xC040B340           c GG c d a b x k 11  S23 0x265E5A51           b GG b c d a x k 0   S24 0xE9B6C7AA           a GG a b c d x k 5   S21 0xD62F105D           d GG d a b c x k 10  S22 0x2441453           c GG c d a b x k 15  S23 0xD8A1E681           b GG b c d a x k 4   S24 0xE7D3FBC8           a GG a b c d x k 9   S21 0x21E1CDE6           d GG d a b c x k 14  S22 0xC33707D6           c GG c d a b x k 3   S23 0xF4D50D87           b GG b c d a x k 8   S24 0x455A14ED           a GG a b c d x k 13  S21 0xA9E3E905           d GG d a b c x k 2   S22 0xFCEFA3F8           c GG c d a b x k 7   S23 0x676F02D9           b GG b c d a x k 12  S24 0x8D2A4C8A           a HH a b c d x k 5   S31 0xFFFA3942           d HH d a b c x k 8   S32 0x8771F681           c HH c d a b x k 11  S33 0x6D9D6122           b HH b c d a x k 14  S34 0xFDE5380C           a HH a b c d x k 1   S31 0xA4BEEA44           d HH d a b c x k 4   S32 0x4BDECFA9           c HH c d a b x k 7   S33 0xF6BB4B60           b HH b c d a x k 10  S34 0xBEBFBC70           a HH a b c d x k 13  S31 0x289B7EC6           d HH d a b c x k 0   S32 0xEAA127FA           c HH c d a b x k 3   S33 0xD4EF3085           b HH b c d a x k 6   S34 0x4881D05           a HH a b c d x k 9   S31 0xD9D4D039           d HH d a b c x k 12  S32 0xE6DB99E5           c HH c d a b x k 15  S33 0x1FA27CF8           b HH b c d a x k 2   S34 0xC4AC5665           a II a b c d x k 0   S41 0xF4292244           d II d a b c x k 7   S42 0x432AFF97           c II c d a b x k 14  S43 0xAB9423A7           b II b c d a x k 5   S44 0xFC93A039           a II a b c d x k 12  S41 0x655B59C3           d II d a b c x k 3   S42 0x8F0CCC92           c II c d a b x k 10  S43 0xFFEFF47D           b II b c d a x k 1   S44 0x85845DD1           a II a b c d x k 8   S41 0x6FA87E4F           d II d a b c x k 15  S42 0xFE2CE6E0           c II c d a b x k 6   S43 0xA3014314           b II b c d a x k 13  S44 0x4E0811A1           a II a b c d x k 4   S41 0xF7537E82           d II d a b c x k 11  S42 0xBD3AF235           c II c d a b x k 2   S43 0x2AD7D2BB           b II b c d a x k 9   S44 0xEB86D391           a AddUnsigned a AA           b AddUnsigned b BB           c AddUnsigned c CC           d AddUnsigned d DD              var temp   WordToHex a  WordToHex b  WordToHex c  WordToHex d        return temp toLowerCase

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import java security    import javax xml bind     byte   bytesOfMessage   yourString getBytes  UTF-8    MessageDigest md   MessageDigest getInstance  MD5    byte   bytesOfDigest   md digest bytesOfMessage   String digest   DatatypeConverter printHexBinary bytesOfDigest  toLowerCase

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Take a look at the following link  the Example gets an MD5 Hash of a supplied image  MD5 Hash of an Image

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I do not know if this is relevant for anyone reading this  but I just had the problem that I wanted to   download a file from a given URL and compare its MD5 to a known value    I wanted to do it with JRE classes only  no Apache Commons or similar   A quick web search did not show me sample code snippets doing both at the same time  only each task separately  Because this requires to read the same file twice  I figured it might be worth the while to write some code which unifies both tasks  calculating the checksum on the fly while downloading the file  This is my result  sorry if it is not perfect Java  but I guess you get the idea anyway    import java io FileOutputStream  import java io IOException  import java math BigInteger  import java net URL  import java nio ByteBuffer  import java nio channels Channels  import java nio channels ReadableByteChannel  import java nio channels WritableByteChannel  import java security DigestOutputStream            new import java security MessageDigest  import java security NoSuchAlgorithmException   void downloadFile String fromURL  String toFile  BigInteger md5      throws IOException  NoSuchAlgorithmException       ReadableByteChannel in   Channels newChannel new URL fromURL  openStream         MessageDigest md5Digest   MessageDigest getInstance  MD5        WritableByteChannel out   Channels newChannel            new FileOutputStream toFile        old         new DigestOutputStream new FileOutputStream toFile   md5Digest        new     ByteBuffer buffer   ByteBuffer allocate 1024   1024       1 MB      while  in read buffer     -1            buffer flip              md5Digest update buffer asReadOnlyBuffer         old         out write buffer           buffer clear               BigInteger md5Actual   new BigInteger 1  md5Digest digest          if    md5Actual equals md5           throw new RuntimeException               MD5 mismatch for file     toFile                  expected     md5 toString 16                   got     md5Actual toString 16

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I did this    Seems to work ok - I m sure somebody will point out mistakes though     public final class MD5   public enum SaltOption       BEFORE  AFTER  BOTH  NONE    private static final String ALG    MD5     For conversion to 2-char hex private static final char   digits          0     1     2     3     4     5         6     7     8     9     a     b         c     d     e     f     g     h         i     j     k     l     m     n         o     p     q     r     s     t         u     v     w     x     y     z      private SaltOption opt          Added the SaltOption constructor since everybody    has their own standards when it comes to salting    hashes         This gives the developer the option            param option The salt option to use  BEFORE  AFTER  BOTH or NONE      public MD5 final SaltOption option          TODO  Add Char Encoding options too    I was too lazy      this opt   option                Returns the salted MD5 checksum of the text passed in as an argument         If the salt is an empty byte array - no salt is applied          param txt The text to run through the MD5 algorithm      param salt The salt value in bytes      return The salted MD5 checksum as a  lt code gt byte   lt  code gt      throws NoSuchAlgorithmException     private byte   createChecksum final String txt  final byte   salt  throws NoSuchAlgorithmException       final MessageDigest complete   MessageDigest getInstance ALG       if opt equals SaltOption BEFORE     opt equals SaltOption BOTH             complete update salt             complete update txt getBytes         if opt equals SaltOption AFTER     opt equals SaltOption BOTH             complete update salt             return complete digest                  Returns the salted MD5 checksum of the file passed in as an argument         If the salt is an empty byte array - no salt is applied          param fle The file to run through the MD5 algorithm      param salt The salt value in bytes      return The salted MD5 checksum as a  lt code gt byte   lt  code gt      throws IOException     throws NoSuchAlgorithmException     private byte   createChecksum final File fle  final byte   salt          throws IOException  NoSuchAlgorithmException       final byte   buffer   new byte 1024       final MessageDigest complete   MessageDigest getInstance ALG               if opt equals SaltOption BEFORE     opt equals SaltOption BOTH                 complete update salt                 int numRead      InputStream fis   null      try           fis   new FileInputStream fle           do               numRead   fis read buffer               if  numRead  gt  0                    complete update buffer  0  numRead                           while  numRead    -1         finally       if  fis    null                fis close                                if opt equals SaltOption AFTER     opt equals SaltOption BOTH                 complete update salt                 return complete digest                  Efficiently converts a byte array to its 2 char per byte hex equivalent         This was adapted from JDK code in the Integer class  I just didn t like    having to use substrings once I got the result           param b The byte array to convert     return The converted String  2 chars per byte        private String convertToHex final byte   b        int x      int charPos      int radix      int mask      final char   buf   new char 32       final char   tmp   new char 3       final StringBuilder md5   new StringBuilder        for  int i   0  i  lt  b length  i              x    b i   amp  0xFF    0x100          charPos   32          radix   1  lt  lt  4          mask   radix - 1          do               buf --charPos    digits x  amp  mask               x  gt  gt  gt   4            while  x    0           System arraycopy buf  charPos  tmp  0   32 - charPos            md5 append Arrays copyOfRange tmp  1  3              return md5 toString                  Returns the salted MD5 checksum of the file passed in as an argument          param fle The file you want want to run through the MD5 algorithm      param salt The salt value in bytes     return The salted MD5 checksum as a 2 char per byte HEX  lt code gt String lt  code gt      throws NoSuchAlgorithmException     throws IOException     public String getMD5Checksum final File fle  final byte   salt          throws NoSuchAlgorithmException  IOException       return convertToHex createChecksum fle  salt                  Returns the MD5 checksum of the file passed in as an argument          param fle The file you want want to run through the MD5 algorithm      return The MD5 checksum as a 2 char per byte HEX  lt code gt String lt  code gt      throws NoSuchAlgorithmException     throws IOException     public String getMD5Checksum final File fle          throws NoSuchAlgorithmException  IOException       return convertToHex createChecksum fle  new byte 0                   Returns the salted MD5 checksum of the text passed in as an argument          param txt The text you want want to run through the MD5 algorithm      param salt The salt value in bytes      return The salted MD5 checksum as a 2 char per byte HEX  lt code gt String lt  code gt      throws NoSuchAlgorithmException     throws IOException     public String getMD5Checksum final String txt  final byte   salt          throws NoSuchAlgorithmException       return convertToHex createChecksum txt  salt                  Returns the MD5 checksum of the text passed in as an argument          param txt The text you want want to run through the MD5 algorithm      return The MD5 checksum as a 2 char per byte HEX  lt code gt String lt  code gt      throws NoSuchAlgorithmException     throws IOException     public String getMD5Checksum final String txt          throws NoSuchAlgorithmException        return convertToHex createChecksum txt  new byte 0

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private String hashuj String dane  throws ServletException      try           MessageDigest m   MessageDigest getInstance  MD5            byte   bufor   dane getBytes            m update bufor 0 bufor length           BigInteger hash   new BigInteger 1 m dige enter code here st             return String format   1 032X   hash          catch  NoSuchAlgorithmException nsae            throw new ServletException  Algorytm szyfrowania nie jest obslugiwany

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Bombe s answer is correct  however note that unless you absolutely must use MD5  e g  forced on you for interoperability   a better choice is SHA1 as MD5 has weaknesses for long term use   I should add that SHA1 also has theoretical vulnerabilities  but not as severe  The current state of the art in hashing is that there are a number of candidate replacement hash functions but none have yet emerged as the standard best practice to replace SHA1  So  depending on your needs you would be well advised to make your hash algorithm configurable so it can be replaced in future

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Another implementation   import javax xml bind DatatypeConverter   String hash   DatatypeConverter printHexBinary              MessageDigest getInstance  MD5   digest  SOMESTRING  getBytes  UTF-8

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You need java security MessageDigest   Call MessageDigest getInstance  MD5   to get a MD5 instance of MessageDigest you can use   The compute the hash by doing one of    Feed the entire input as a byte   and calculate the hash in one operation with md digest bytes   Feed the MessageDigest one byte   chunk at a time by calling md update bytes   When you re done adding input bytes  calculate the hash with  md digest      The byte   returned by md digest   is the MD5 hash

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Found this solution which is much cleaner in terms of getting a String representation back from an MD5 hash   import java security    import java math     public class MD5       public static void main String args    throws Exception          String s  This is a test           MessageDigest m MessageDigest getInstance  MD5            m update s getBytes   0 s length             System out println  MD5    new BigInteger 1 m digest    toString 16              The code was extracted from here

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I have a Class  Hash  to convert plain text in hash in formats  md5 or sha1  simillar that php functions  md5  sha1    public class Hash                           param txt  text in plain format         param hashType MD5 OR SHA1         return hash in hashType              public static String getHash String txt  String hashType            try                       java security MessageDigest md   java security MessageDigest getInstance hashType                       byte   array   md digest txt getBytes                         StringBuffer sb   new StringBuffer                        for  int i   0  i  lt  array length    i                            sb append Integer toHexString  array i   amp  0xFF    0x100  substring 1 3                                           return sb toString                  catch  java security NoSuchAlgorithmException e                      error action                           return null             public static String md5 String txt            return Hash getHash txt   MD5               public static String sha1 String txt            return Hash getHash txt   SHA1              Testing with JUnit and PHP  PHP Script    lt  php  echo  MD5      md5  Hello World       n   echo  SHA1     sha1  Hello World       n     Output PHP script   MD5  b10a8db164e0754105b7a99be72e3fe5 SHA1 0a4d55a8d778e5022fab701977c5d840bbc486d0   Using example and Testing with JUnit       public class HashTest         Test     public void test             String txt    Hello World           assertEquals  b10a8db164e0754105b7a99be72e3fe5   Hash md5 txt            assertEquals  0a4d55a8d778e5022fab701977c5d840bbc486d0   Hash sha1 txt               Code in GitHub     https   github com fitorec java-hashes

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try this   public static String getHashMD5 String string        try           MessageDigest md   MessageDigest getInstance  MD5            BigInteger bi   new BigInteger 1  md digest string getBytes              return bi toString 16         catch  NoSuchAlgorithmException ex            Logger getLogger MD5Utils class                  getName    log Level SEVERE  null  ex            return

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Another implementation   import javax xml bind DatatypeConverter   String hash   DatatypeConverter printHexBinary              MessageDigest getInstance  MD5   digest  SOMESTRING  getBytes  UTF-8

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Here is how I use it   final MessageDigest messageDigest   MessageDigest getInstance  MD5    messageDigest reset    messageDigest update string getBytes Charset forName  UTF8      final byte   resultByte   messageDigest digest    final String result   new String Hex encodeHex resultByte      where Hex is  org apache commons codec binary Hex from the Apache Commons project

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I just downloaded commons-codec jar and got perfect php like md5  Here is manual   Just import it to your project and use  String Url    your url    System out println  DigestUtils md5Hex  Url        and there you have it

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For what it s worth  I stumbled upon this because I want to synthesize GUIDs from a natural key for a program that will install COM components  I want to syhthesize so as not to manage GUID lifecycle  I ll use MD5 and then use the UUID class to get a string out of it   http   stackoverflow com questions 2190890 how-can-i-generate-guid-for-a-string-values 12867439 raises this issue    In any case  java util UUID can get you a nice String from the MD5 bytes   return UUID nameUUIDFromBytes md5Bytes  toString

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try this   public static String getHashMD5 String string        try           MessageDigest md   MessageDigest getInstance  MD5            BigInteger bi   new BigInteger 1  md digest string getBytes              return bi toString 16         catch  NoSuchAlgorithmException ex            Logger getLogger MD5Utils class                  getName    log Level SEVERE  null  ex            return

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There is a DigestUtils class in Spring also   http   static springsource org spring docs 3 0 x javadoc-api org springframework util DigestUtils html  This class contains the method md5DigestAsHex   that does the job

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For what it s worth  I stumbled upon this because I want to synthesize GUIDs from a natural key for a program that will install COM components  I want to syhthesize so as not to manage GUID lifecycle  I ll use MD5 and then use the UUID class to get a string out of it   http   stackoverflow com questions 2190890 how-can-i-generate-guid-for-a-string-values 12867439 raises this issue    In any case  java util UUID can get you a nice String from the MD5 bytes   return UUID nameUUIDFromBytes md5Bytes  toString

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Another implementation  Fast MD5 Implementation in Java  String hash   MD5 asHex MD5 getHash new File filename

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Take a look at the following link  the Example gets an MD5 Hash of a supplied image  MD5 Hash of an Image

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Take a look at the following link  the Example gets an MD5 Hash of a supplied image  MD5 Hash of an Image

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If you actually want the answer back as a string as opposed to a byte array  you could always do something like this   String plaintext    your text here   MessageDigest m   MessageDigest getInstance  MD5    m reset    m update plaintext getBytes     byte   digest   m digest    BigInteger bigInt   new BigInteger 1 digest   String hashtext   bigInt toString 16      Now we need to zero pad it if you actually want the full 32 chars  while hashtext length    lt  32      hashtext    0  hashtext

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I ve found this to be the most clear and concise way to do it   MessageDigest md5   MessageDigest getInstance  MD5    md5 update StandardCharsets UTF 8 encode string    return String format   032x   new BigInteger 1  md5 digest

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Found this solution which is much cleaner in terms of getting a String representation back from an MD5 hash   import java security    import java math     public class MD5       public static void main String args    throws Exception          String s  This is a test           MessageDigest m MessageDigest getInstance  MD5            m update s getBytes   0 s length             System out println  MD5    new BigInteger 1 m digest    toString 16              The code was extracted from here

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import java math BigInteger   import java security MessageDigest   import java security NoSuchAlgorithmException         MD5 encryption      author Hongten      public class MD5     public static void main String   args         System out println MD5 getMD5  123456                  Use md5 encoded code value          param sInput     clearly       return md5 encrypted password       public static String getMD5 String sInput          String algorithm            if  sInput    null             return  null               try            algorithm   System getProperty  MD5 algorithm    MD5           catch  SecurityException se                MessageDigest md   null       try            md   MessageDigest getInstance algorithm          catch  NoSuchAlgorithmException e             e printStackTrace                byte buffer     sInput getBytes          for  int count   0  count  lt  sInput length    count               md update buffer  0  count               byte bDigest     md digest         BigInteger bi   new BigInteger bDigest        return  bi toString 16           There is an article on Codingkit about that  Check out  http   codingkit com a JAVA 2013 1020 2216 html

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MD5 is perfectly fine if you don t need the best security  and if you re doing something like checking file integrity then security is not a consideration   In such as case you might want to consider something simpler and faster  such as Adler32  which is also supported by the Java libraries

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this one gives the exact md5 as you get from mysql s md5 function or php s md5 functions etc  This is the one I use  you can change according to your needs   public static String md5  String input         try           java security MessageDigest md   java security MessageDigest getInstance  MD5            byte   array   md digest input getBytes   UTF-8              StringBuffer sb   new StringBuffer            for  int i   0  i  lt  array length  i                  sb append  String format    02x   array i                       return sb toString          catch   NoSuchAlgorithmException   UnsupportedEncodingException e            return null

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I have made this using php as follows    lt  php  goodtext    Not found      If there is no parameter  this code is all skipped if   isset   GET  md5             time pre   microtime true        md5     GET  md5           This is our alphabet      txt    0123456789        show   15         Outer loop go go through the alphabet for the        first position in our  possible  pre-hash        text     for  i 0   i lt strlen  txt    i                ch1    txt  i        The first of two characters            Our inner loop Note the use of new variables             j and  ch2          for  j 0   j lt strlen  txt    j                    ch2    txt  j       Our second character             for  k 0   k lt strlen  txt    k                        ch3    txt  k                   for  l 0   l lt strlen  txt    l                          ch4    txt  l                          Concatenate the two characters together to                         form the  possible  pre-hash text                      try    ch1  ch2  ch3  ch4                         Run the hash and then check to see if we match                      check   hash  md5    try                       if    check     md5                              goodtext    try                          break       Exit the inner loop                                              Debug output until  show hits 0                     if    show  gt  0                             print   check  try n                            show    show - 1                                            if  goodtext     try                           break                                                          if  goodtext     try                       break                                              if  goodtext     try                    break                                    if  goodtext     try               break                         Compute ellapsed time      time post   microtime true       print  Ellapsed time         print  time post- time pre      print   n       gt    you may refer this - source

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The MessageDigest class can provide you with an instance of the MD5 digest   When working with strings and the crypto classes be sure to always specify the encoding you want the byte representation in  If you just use string getBytes   it will use the platform default   Not all platforms use the same defaults   import java security         byte   bytesOfMessage   yourString getBytes  UTF-8     MessageDigest md   MessageDigest getInstance  MD5    byte   thedigest   md digest bytesOfMessage     If you have a lot of data take a look at the  update byte    method which can be called repeatedly  Then call  digest   to obtain the resulting hash

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I have made this using php as follows    lt  php  goodtext    Not found      If there is no parameter  this code is all skipped if   isset   GET  md5             time pre   microtime true        md5     GET  md5           This is our alphabet      txt    0123456789        show   15         Outer loop go go through the alphabet for the        first position in our  possible  pre-hash        text     for  i 0   i lt strlen  txt    i                ch1    txt  i        The first of two characters            Our inner loop Note the use of new variables             j and  ch2          for  j 0   j lt strlen  txt    j                    ch2    txt  j       Our second character             for  k 0   k lt strlen  txt    k                        ch3    txt  k                   for  l 0   l lt strlen  txt    l                          ch4    txt  l                          Concatenate the two characters together to                         form the  possible  pre-hash text                      try    ch1  ch2  ch3  ch4                         Run the hash and then check to see if we match                      check   hash  md5    try                       if    check     md5                              goodtext    try                          break       Exit the inner loop                                              Debug output until  show hits 0                     if    show  gt  0                             print   check  try n                            show    show - 1                                            if  goodtext     try                           break                                                          if  goodtext     try                       break                                              if  goodtext     try                    break                                    if  goodtext     try               break                         Compute ellapsed time      time post   microtime true       print  Ellapsed time         print  time post- time pre      print   n       gt    you may refer this - source

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If you actually want the answer back as a string as opposed to a byte array  you could always do something like this   String plaintext    your text here   MessageDigest m   MessageDigest getInstance  MD5    m reset    m update plaintext getBytes     byte   digest   m digest    BigInteger bigInt   new BigInteger 1 digest   String hashtext   bigInt toString 16      Now we need to zero pad it if you actually want the full 32 chars  while hashtext length    lt  32      hashtext    0  hashtext

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Here is how I use it   final MessageDigest messageDigest   MessageDigest getInstance  MD5    messageDigest reset    messageDigest update string getBytes Charset forName  UTF8      final byte   resultByte   messageDigest digest    final String result   new String Hex encodeHex resultByte      where Hex is  org apache commons codec binary Hex from the Apache Commons project

[java] How can I generate an MD5 hash?

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