Simple non-secure hash function for JavaScript

Question

Possible Duplicate    Generate a Hash from string in Javascript jQuery       Can anyone suggest a simple  i e  tens of lines of code  not hundreds of lines  hash function written in  browser-compatible  JavaScript   Ideally I d like something that  when passed a string as input  produces something similar to the 32 character hexadecimal string that s the typical output of MD5  SHA1  etc   It doesn t have to be cryptographically secure  just reasonably resistant to collisions    My initial use case is URLs  but I ll probably want to use it on other strings in the future

User · Answer

Check out this MD5 implementation for JavaScript  Its BSD Licensed and really easy to use  Example   md5   hex md5  message to digest

User · Answer

There are many realizations of hash functions written in JS  For example    SHA-1  http   www webtoolkit info javascript-sha1 html SHA-256  http   www webtoolkit info javascript-sha256 html MD5  http   www webtoolkit info javascript-md5 html   If you don t need security  you can also use base64 which is not hash-function  has not fixed output and could be simply decoded by user  but looks more lightweight and could be used for hide values  http   www webtoolkit info javascript-base64 html

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I didn t verify this myself  but you can look at this JavaScript implementation of Java s String hashCode   method  Seems reasonably short      With this prototype you can simply call  hashCode   on any string  e g   some string  hashCode    and receive a numerical hash code  more specifically  a Java equivalent  such as 1395333309    String prototype hashCode   function         var hash   0      if  this length    0            return hash            for  var i   0  i  lt  this length  i              var char   this charCodeAt i           hash     hash lt  lt 5 -hash  char          hash   hash  amp  hash     Convert to 32bit integer           return hash

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Check out these implementations   http   www movable-type co uk scripts sha1 html  SHA-1 algorithm  http   pajhome org uk crypt md5   implementations for SHA-1  MD5  HMAC and others

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Simple object hasher    function          Number prototype toHex   function              var ret     this lt 0 0x8 0    this  gt  gt  28   amp  0x7   toString 16     this  amp  0xfffffff  toString 16           while  ret length  lt  8  ret    0  ret          return ret             Object hashCode   function hashCode o  l            l   l    2          var i  c  r               for  i 0  i lt l  i                r push i 268803292           function stringify o                var i r              if  o     null  return  n               if  o     true  return  t               if  o     false  return  f               if  o instanceof Date  return  d    0 o               i typeof o              if  i      string   return  s   o replace            g     1                if  i      number   return  n   o              if  o instanceof Function  return  m   o toString   replace            g     1                if  o instanceof Array                    r                     for  i 0  i lt o length  i                         r push stringify o i                     return  a   r join                                 r                 for  i in o                    r push i     stringify o i                              return  o   r join                         o   stringify o           for  i 0  i lt o length  i                  for  c 0  c lt r length  c                      r c     r c   lt  lt  13 - r c   gt  gt  19                   r c     o charCodeAt i   lt  lt   r c    24                   r c    r c   amp  r c                                   for  i 0  i lt r length  i                  r i    r i  toHex                      return r join                    The meat here is the stringifier  which simply converts any object into a unique string   hashCode then runs over the object  hashing together the characters of the stringified object   For extra points  export the stringifier and create a parser

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Simple but unreliable function to create string hash by Sergey Shuchkin  t  gmail com    alert  strhash  http   www w3schools com js default asp         6mn6tf7st333r2q4o134o58888888888 function strhash  str         if  str length   32  gt  0  str    Array 33 - str length   32  join  z        var hash       bytes       i   j   k   a   0  dict     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   1   2   3   4   5   6   7   8   9        for  i   0  i  lt  str length  i               ch   str charCodeAt i           bytes j       ch  lt  127    ch  amp  0xFF   127            var chunk len   Math ceil bytes length   32          for  i 0  i lt bytes length  i              j    bytes i           k            if   k    chunk len      i    bytes length-1                 a   Math floor  j   k                if  a  lt  32                  hash     0               else if  a  gt  126                  hash     z               else                 hash    dict   Math floor   a-32    2 76                 j   k   0                      return hash

[javascript] Simple (non-secure) hash function for JavaScript?

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