Fast and simple String encrypt decrypt in JAVA

Question

I need fast and simple way to encrypt decrypt a  lot  of String data  I tried jasypt but it crashes on my Android phone  I have about 2000 records  strings    BasicTextEncryptor textEncryptor   new BasicTextEncryptor    textEncryptor setPassword  password    String myEncryptedText   textEncryptor encrypt input     Is there some other way  I don t need extremely high security  it needs to be fast

User · Answer

Simplest way is to add this JAVA library using Gradle:

compile 'se.simbio.encryption:library:2.0.0'

You can use it as simple as this:

Encryption encryption = Encryption.getDefault("Key", "Salt", new byte[16]);
String encrypted = encryption.encryptOrNull("top secret string");
String decrypted = encryption.decryptOrNull(encrypted);

User · Answer

If you are using Android then you can use android util Base64 class   Encode   passwd   Base64 encodeToString  passwd getBytes    Base64 DEFAULT      Decode   passwd   new String  Base64 decode  passwd  Base64 DEFAULT        A simple and fast single line solution

User · Answer

Update the library already have Java Kotlin support  see github   Original To simplify I did a class to be used simply  I added it on Encryption library to use it you just do as follow  Add the gradle library  compile  se simbio encryption library 2 0 0   and use it  Encryption encryption   Encryption getDefault  quot Key quot    quot Salt quot   new byte 16    String encrypted   encryption encryptOrNull  quot top secret string quot    String decrypted   encryption decryptOrNull encrypted     if you not want add the Encryption library you can just copy the following class to your project  If you are in an android project you need to import android Base64 in this class  if you are in a pure java project you need to add this class manually you can get it here Encryption java package se simbio encryption   import java io UnsupportedEncodingException  import java security InvalidAlgorithmParameterException  import java security InvalidKeyException  import java security MessageDigest  import java security NoSuchAlgorithmException  import java security SecureRandom  import java security spec InvalidKeySpecException  import java security spec KeySpec   import javax crypto BadPaddingException  import javax crypto Cipher  import javax crypto IllegalBlockSizeException  import javax crypto NoSuchPaddingException  import javax crypto SecretKey  import javax crypto SecretKeyFactory  import javax crypto spec IvParameterSpec  import javax crypto spec PBEKeySpec  import javax crypto spec SecretKeySpec          A class to make more easy and simple the encrypt routines  this is the core of Encryption library     public class Encryption                   The Builder used to create the Encryption instance and that contains the information about        encryption specifications  this instance need to be private and careful managed             private final Builder mBuilder                  The private and unique constructor  you should use the Encryption Builder to build your own        instance or get the default proving just the sensible information about encryption             private Encryption Builder builder            mBuilder   builder                         return an default encryption instance or   code null  if occur some Exception  you can        create yur own Encryption instance using the Encryption Builder             public static Encryption getDefault String key  String salt  byte   iv            try               return Builder getDefaultBuilder key  salt  iv  build              catch  NoSuchAlgorithmException e                e printStackTrace                return null                                  Encrypt a String                param data the String to be encrypted                return the encrypted String or   code null  if you send the data as   code null                 throws UnsupportedEncodingException       if the Builder charset name is not supported or if                                                   the Builder charset name is not supported         throws NoSuchAlgorithmException           if the Builder digest algorithm is not available                                                   or if this has no installed provider that can                                                   provide the requested by the Builder secret key                                                   type or it is   code null   empty or in an invalid                                                   format         throws NoSuchPaddingException             if no installed provider can provide the padding                                                   scheme in the Builder digest algorithm         throws InvalidAlgorithmParameterException if the specified parameters are inappropriate for                                                   the cipher         throws InvalidKeyException                if the specified key can not be used to initialize                                                   the cipher instance         throws InvalidKeySpecException            if the specified key specification cannot be used                                                   to generate a secret key         throws BadPaddingException                if the padding of the data does not match the                                                   padding scheme         throws IllegalBlockSizeException          if the size of the resulting bytes is not a                                                   multiple of the cipher block size         throws NullPointerException               if the Builder digest algorithm is   code null  or                                                   if the specified Builder secret key type is                                                     code null          throws IllegalStateException              if the cipher instance is not initialized for                                                   encryption or decryption             public String encrypt String data  throws UnsupportedEncodingException  NoSuchAlgorithmException  NoSuchPaddingException  InvalidAlgorithmParameterException  InvalidKeyException  InvalidKeySpecException  BadPaddingException  IllegalBlockSizeException           if  data    null  return null          SecretKey secretKey   getSecretKey hashTheKey mBuilder getKey              byte   dataBytes   data getBytes mBuilder getCharsetName             Cipher cipher   Cipher getInstance mBuilder getAlgorithm             cipher init Cipher ENCRYPT MODE  secretKey  mBuilder getIvParameterSpec    mBuilder getSecureRandom             return Base64 encodeToString cipher doFinal dataBytes   mBuilder getBase64Mode                           This is a sugar method that calls encrypt method and catch the exceptions returning          code null  when it occurs and logging the error                param data the String to be encrypted                return the encrypted String or   code null  if you send the data as   code null              public String encryptOrNull String data            try               return encrypt data             catch  Exception e                e printStackTrace                return null                                  This is a sugar method that calls encrypt method in background  it is a good idea to use this        one instead the default method because encryption can take several time and with this method        the process occurs in a AsyncTask  other advantage is the Callback with separated methods         one for success and other for the exception                param data     the String to be encrypted         param callback the Callback to handle the results             public void encryptAsync final String data  final Callback callback            if  callback    null  return          new Thread new Runnable                  Override             public void run                     try                       String encrypt   encrypt data                       if  encrypt    null                            callback onError new Exception  quot Encrypt return null  it normally occurs when you send a null data quot                                               callback onSuccess encrypt                     catch  Exception e                        callback onError e                                              start                          Decrypt a String                param data the String to be decrypted                return the decrypted String or   code null  if you send the data as   code null                 throws UnsupportedEncodingException       if the Builder charset name is not supported or if                                                   the Builder charset name is not supported         throws NoSuchAlgorithmException           if the Builder digest algorithm is not available                                                   or if this has no installed provider that can                                                   provide the requested by the Builder secret key                                                   type or it is   code null   empty or in an invalid                                                   format         throws NoSuchPaddingException             if no installed provider can provide the padding                                                   scheme in the Builder digest algorithm         throws InvalidAlgorithmParameterException if the specified parameters are inappropriate for                                                   the cipher         throws InvalidKeyException                if the specified key can not be used to initialize                                                   the cipher instance         throws InvalidKeySpecException            if the specified key specification cannot be used                                                   to generate a secret key         throws BadPaddingException                if the padding of the data does not match the                                                   padding scheme         throws IllegalBlockSizeException          if the size of the resulting bytes is not a                                                   multiple of the cipher block size         throws NullPointerException               if the Builder digest algorithm is   code null  or                                                   if the specified Builder secret key type is                                                     code null          throws IllegalStateException              if the cipher instance is not initialized for                                                   encryption or decryption             public String decrypt String data  throws UnsupportedEncodingException  NoSuchAlgorithmException  InvalidKeySpecException  NoSuchPaddingException  InvalidAlgorithmParameterException  InvalidKeyException  BadPaddingException  IllegalBlockSizeException           if  data    null  return null          byte   dataBytes   Base64 decode data  mBuilder getBase64Mode             SecretKey secretKey   getSecretKey hashTheKey mBuilder getKey              Cipher cipher   Cipher getInstance mBuilder getAlgorithm             cipher init Cipher DECRYPT MODE  secretKey  mBuilder getIvParameterSpec    mBuilder getSecureRandom             byte   dataBytesDecrypted    cipher doFinal dataBytes            return new String dataBytesDecrypted                         This is a sugar method that calls decrypt method and catch the exceptions returning          code null  when it occurs and logging the error                param data the String to be decrypted                return the decrypted String or   code null  if you send the data as   code null              public String decryptOrNull String data            try               return decrypt data             catch  Exception e                e printStackTrace                return null                                  This is a sugar method that calls decrypt method in background  it is a good idea to use this        one instead the default method because decryption can take several time and with this method        the process occurs in a AsyncTask  other advantage is the Callback with separated methods         one for success and other for the exception                param data     the String to be decrypted         param callback the Callback to handle the results             public void decryptAsync final String data  final Callback callback            if  callback    null  return          new Thread new Runnable                  Override             public void run                     try                       String decrypt   decrypt data                       if  decrypt    null                            callback onError new Exception  quot Decrypt return null  it normally occurs when you send a null data quot                                               callback onSuccess decrypt                     catch  Exception e                        callback onError e                                              start                          creates a 128bit salted aes key                param key encoded input key                return aes 128 bit salted key                throws NoSuchAlgorithmException     if no installed provider that can provide the requested                                             by the Builder secret key type         throws UnsupportedEncodingException if the Builder charset name is not supported         throws InvalidKeySpecException      if the specified key specification cannot be used to                                             generate a secret key         throws NullPointerException         if the specified Builder secret key type is   code null              private SecretKey getSecretKey char   key  throws NoSuchAlgorithmException  UnsupportedEncodingException  InvalidKeySpecException           SecretKeyFactory factory   SecretKeyFactory getInstance mBuilder getSecretKeyType             KeySpec spec   new PBEKeySpec key  mBuilder getSalt   getBytes mBuilder getCharsetName     mBuilder getIterationCount    mBuilder getKeyLength             SecretKey tmp   factory generateSecret spec           return new SecretKeySpec tmp getEncoded    mBuilder getKeyAlgorithm                           takes in a simple string and performs an sha1 hash        that is 128 bits long   we then base64 encode it        and return the char array                param key simple inputted string                return sha1 base64 encoded representation                throws UnsupportedEncodingException if the Builder charset name is not supported         throws NoSuchAlgorithmException     if the Builder digest algorithm is not available         throws NullPointerException         if the Builder digest algorithm is   code null              private char   hashTheKey String key  throws UnsupportedEncodingException  NoSuchAlgorithmException           MessageDigest messageDigest   MessageDigest getInstance mBuilder getDigestAlgorithm             messageDigest update key getBytes mBuilder getCharsetName              return Base64 encodeToString messageDigest digest    Base64 NO PADDING  toCharArray                          When you encrypt or decrypt in callback mode you get noticed of result using this interface             public interface Callback                           Called when encrypt or decrypt job ends and the process was a success                        param result the encrypted or decrypted String                     void onSuccess String result                           Called when encrypt or decrypt job ends and has occurred an error in the process                        param exception the Exception related to the error                     void onError Exception exception                          This class is used to create an Encryption instance  you should provide ALL data or start        with the Default Builder provided by the getDefaultBuilder method             public static class Builder            private byte   mIv          private int mKeyLength          private int mBase64Mode          private int mIterationCount          private String mSalt          private String mKey          private String mAlgorithm          private String mKeyAlgorithm          private String mCharsetName          private String mSecretKeyType          private String mDigestAlgorithm          private String mSecureRandomAlgorithm          private SecureRandom mSecureRandom          private IvParameterSpec mIvParameterSpec                           return an default builder with the follow defaults             the default char set is UTF-8            the default base mode is Base64            the Secret Key Type is the PBKDF2WithHmacSHA1            the default salt is  quot some salt quot  but can be anything            the default length of key is 128            the default iteration count is 65536            the default algorithm is AES in CBC mode and PKCS 5 Padding            the default secure random algorithm is SHA1PRNG            the default message digest algorithm SHA1                     public static Builder getDefaultBuilder String key  String salt  byte   iv                return new Builder                        setIv iv                       setKey key                       setSalt salt                       setKeyLength 128                       setKeyAlgorithm  quot AES quot                        setCharsetName  quot UTF8 quot                        setIterationCount 1                       setDigestAlgorithm  quot SHA1 quot                        setBase64Mode Base64 DEFAULT                       setAlgorithm  quot AES CBC PKCS5Padding quot                        setSecureRandomAlgorithm  quot SHA1PRNG quot                        setSecretKeyType  quot PBKDF2WithHmacSHA1 quot                                      Build the Encryption with the provided information                        return a new Encryption instance with provided information                        throws NoSuchAlgorithmException if the specified SecureRandomAlgorithm is not available             throws NullPointerException     if the SecureRandomAlgorithm is   code null  or if the                                             IV byte array is null                     public Encryption build   throws NoSuchAlgorithmException               setSecureRandom SecureRandom getInstance getSecureRandomAlgorithm                  setIvParameterSpec new IvParameterSpec getIv                  return new Encryption this                                      return the charset name                     private String getCharsetName                 return mCharsetName                                     param charsetName the new charset name                        return this instance to follow the Builder patter                     public Builder setCharsetName String charsetName                mCharsetName   charsetName              return this                                     return the algorithm                     private String getAlgorithm                 return mAlgorithm                                     param algorithm the algorithm to be used                        return this instance to follow the Builder patter                     public Builder setAlgorithm String algorithm                mAlgorithm   algorithm              return this                                     return the key algorithm                     private String getKeyAlgorithm                 return mKeyAlgorithm                                     param keyAlgorithm the keyAlgorithm to be used in keys                        return this instance to follow the Builder patter                     public Builder setKeyAlgorithm String keyAlgorithm                mKeyAlgorithm   keyAlgorithm              return this                                     return the Base 64 mode                     private int getBase64Mode                 return mBase64Mode                                     param base64Mode set the base 64 mode                        return this instance to follow the Builder patter                     public Builder setBase64Mode int base64Mode                mBase64Mode   base64Mode              return this                                     return the type of aes key that will be created  on KITKAT  the API has changed  if you            are getting problems please  see  lt a href  quot http   android-developers blogspot com br 2013 12 changes-to-secretkeyfactory-api-in html quot  gt http   android-developers blogspot com br 2013 12 changes-to-secretkeyfactory-api-in html lt  a gt                      private String getSecretKeyType                 return mSecretKeyType                                     param secretKeyType the type of AES key that will be created  on KITKAT  the API has                                 changed  if you are getting problems please  see  lt a href  quot http   android-developers blogspot com br 2013 12 changes-to-secretkeyfactory-api-in html quot  gt http   android-developers blogspot com br 2013 12 changes-to-secretkeyfactory-api-in html lt  a gt                         return this instance to follow the Builder patter                     public Builder setSecretKeyType String secretKeyType                mSecretKeyType   secretKeyType              return this                                     return the value used for salting                     private String getSalt                 return mSalt                                     param salt the value used for salting                        return this instance to follow the Builder patter                     public Builder setSalt String salt                mSalt   salt              return this                                     return the key                     private String getKey                 return mKey                                     param key the key                         return this instance to follow the Builder patter                     public Builder setKey String key                mKey   key              return this                                     return the length of key                     private int getKeyLength                 return mKeyLength                                     param keyLength the length of key                        return this instance to follow the Builder patter                     public Builder setKeyLength int keyLength                mKeyLength   keyLength              return this                                     return the number of times the password is hashed                     private int getIterationCount                 return mIterationCount                                     param iterationCount the number of times the password is hashed                        return this instance to follow the Builder patter                     public Builder setIterationCount int iterationCount                mIterationCount   iterationCount              return this                                     return the algorithm used to generate the secure random                     private String getSecureRandomAlgorithm                 return mSecureRandomAlgorithm                                     param secureRandomAlgorithm the algorithm to generate the secure random                        return this instance to follow the Builder patter                     public Builder setSecureRandomAlgorithm String secureRandomAlgorithm                mSecureRandomAlgorithm   secureRandomAlgorithm              return this                                     return the IvParameterSpec bytes array                     private byte   getIv                 return mIv                                     param iv the byte array to create a new IvParameterSpec                        return this instance to follow the Builder patter                     public Builder setIv byte   iv                mIv   iv              return this                                     return the SecureRandom                     private SecureRandom getSecureRandom                 return mSecureRandom                                     param secureRandom the Secure Random                        return this instance to follow the Builder patter                     public Builder setSecureRandom SecureRandom secureRandom                mSecureRandom   secureRandom              return this                                     return the IvParameterSpec                     private IvParameterSpec getIvParameterSpec                 return mIvParameterSpec                                     param ivParameterSpec the IvParameterSpec                        return this instance to follow the Builder patter                     public Builder setIvParameterSpec IvParameterSpec ivParameterSpec                mIvParameterSpec   ivParameterSpec              return this                                     return the message digest algorithm                     private String getDigestAlgorithm                 return mDigestAlgorithm                                     param digestAlgorithm the algorithm to be used to get message digest instance                        return this instance to follow the Builder patter                     public Builder setDigestAlgorithm String digestAlgorithm                mDigestAlgorithm   digestAlgorithm              return this

User · Answer

Java - encrypt   decrypt user name and password from a configuration file  Code from above link  DESKeySpec keySpec   new DESKeySpec  Your secret Key phrase  getBytes  UTF8     SecretKeyFactory keyFactory   SecretKeyFactory getInstance  DES    SecretKey key   keyFactory generateSecret keySpec   sun misc BASE64Encoder base64encoder   new BASE64Encoder    sun misc BASE64Decoder base64decoder   new BASE64Decoder                  ENCODE plainTextPassword String byte   cleartext   plainTextPassword getBytes  UTF8           Cipher cipher   Cipher getInstance  DES       cipher is not thread safe cipher init Cipher ENCRYPT MODE  key   String encryptedPwd   base64encoder encode cipher doFinal cleartext       now you can store it             DECODE encryptedPwd String byte   encrypedPwdBytes   base64decoder decodeBuffer encryptedPwd    Cipher cipher   Cipher getInstance  DES      cipher is not thread safe cipher init Cipher DECRYPT MODE  key   byte   plainTextPwdBytes    cipher doFinal encrypedPwdBytes

[java] Fast and simple String encrypt/decrypt in JAVA

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