Dart Documentation › crypto › MD5

MD5 class

MD5 hash function implementation.

WARNING: MD5 has known collisions and should only be used when required for backwards compatibility.

class MD5 extends _HashBase {
 MD5() : super(16, 4, false) {
   _h[0] = 0x67452301;
   _h[1] = 0xefcdab89;
   _h[2] = 0x98badcfe;
   _h[3] = 0x10325476;
 }

 // Returns a new instance of this Hash.
 MD5 newInstance() {
   return new MD5();
 }

 static const _k = const [
   0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a,
   0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
   0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340,
   0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
   0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
   0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
   0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa,
   0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
   0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
   0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
   0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 ];

 static const _r = const [
   7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5,  9, 14,
   20, 5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20, 4, 11, 16, 23, 4, 11,
   16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6,
   10, 15, 21, 6, 10, 15, 21 ];

 // Compute one iteration of the MD5 algorithm with a chunk of
 // 16 32-bit pieces.
 void _updateHash(List<int> m) {
   assert(m.length == 16);

   var a = _h[0];
   var b = _h[1];
   var c = _h[2];
   var d = _h[3];

   var t0;
   var t1;

   for (var i = 0; i < 64; i++) {
     if (i < 16) {
       t0 = (b & c) | ((~b & _MASK_32) & d);
       t1 = i;
     } else if (i < 32) {
       t0 = (d & b) | ((~d & _MASK_32) & c);
       t1 = ((5 * i) + 1) % 16;
     } else if (i < 48) {
       t0 = b ^ c ^ d;
       t1 = ((3 * i) + 5) % 16;
     } else {
       t0 = c ^ (b | (~d & _MASK_32));
       t1 = (7 * i) % 16;
     }

     var temp = d;
     d = c;
     c = b;
     b = _add32(b, _rotl32(_add32(_add32(a, t0),
                                  _add32(_k[i], m[t1])),
                           _r[i]));
     a = temp;
   }

   _h[0] = _add32(a, _h[0]);
   _h[1] = _add32(b, _h[1]);
   _h[2] = _add32(c, _h[2]);
   _h[3] = _add32(d, _h[3]);
 }
}

Extends

_HashBase > MD5

Constructors

new MD5() #

Creates a new Object instance.

Object instances have no meaningful state, and are only useful through their identity. An Object instance is equal to itself only.

docs inherited from Object 
MD5() : super(16, 4, false) {
 _h[0] = 0x67452301;
 _h[1] = 0xefcdab89;
 _h[2] = 0x98badcfe;
 _h[3] = 0x10325476;
}

Properties

final int blockSize #

inherited from _HashBase

Internal block size of the hash in bytes.

This is exposed for use by the HMAC class which needs to know the block size for the Hash it is using.

docs inherited from Hash 
int get blockSize {
 return _chunkSizeInWords * _BYTES_PER_WORD;
}

Methods

dynamic add(List<int> data) #

inherited from _HashBase

Add a list of bytes to the hash computation.

docs inherited from Hash 
add(List<int> data) {
 if (_digestCalled) {
   throw new StateError(
       'Hash update method called after digest was retrieved');
 }
 _lengthInBytes += data.length;
 _pendingData.addAll(data);
 _iterate();
}

List<int> close() #

inherited from _HashBase

Finish the hash computation and extract the message digest as a list of bytes.

docs inherited from Hash 
List<int> close() {
 if (_digestCalled) {
   return _resultAsBytes();
 }
 _digestCalled = true;
 _finalizeData();
 _iterate();
 assert(_pendingData.length == 0);
 return _resultAsBytes();
}

MD5 newInstance() #

Returns a new instance of this hash function.

docs inherited from Hash 
MD5 newInstance() {
 return new MD5();
}