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Aceix::Code

By: aceix on Oct 18th, 2012  |  syntax: C++  |  size: 11.41 KB  |  views: 13  |  expires: Never
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  1. #ifndef MD5_H
  2. #define MD5_H
  3.  
  4. // Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
  5. // rights reserved.
  6.  
  7. // License to copy and use this software is granted provided that it
  8. // is identified as the "RSA Data Security, Inc. MD5 Message-Digest
  9. // Algorithm" in all material mentioning or referencing this software
  10. // or this function.
  11. //
  12. // License is also granted to make and use derivative works provided
  13. // that such works are identified as "derived from the RSA Data
  14. // Security, Inc. MD5 Message-Digest Algorithm" in all material
  15. // mentioning or referencing the derived work.
  16. //
  17. // RSA Data Security, Inc. makes no representations concerning either
  18. // the merchantability of this software or the suitability of this
  19. // software for any particular purpose. It is provided "as is"
  20. // without express or implied warranty of any kind.
  21. //
  22. // These notices must be retained in any copies of any part of this
  23. // documentation and/or software.
  24.  
  25.  
  26.  
  27. // The original md5 implementation avoids external libraries.
  28. // This version has dependency on stdio.h for file input and
  29. // string.h for memcpy.
  30. #include <stdio.h>
  31. #include <string.h>
  32.  
  33. #pragma region MD5 defines
  34. // Constants for MD5Transform routine.
  35. #define S11 7
  36. #define S12 12
  37. #define S13 17
  38. #define S14 22
  39. #define S21 5
  40. #define S22 9
  41. #define S23 14
  42. #define S24 20
  43. #define S31 4
  44. #define S32 11
  45. #define S33 16
  46. #define S34 23
  47. #define S41 6
  48. #define S42 10
  49. #define S43 15
  50. #define S44 21
  51.  
  52.  
  53.  
  54.  
  55.  
  56.  
  57. static unsigned char PADDING[64] = {
  58.   0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  59.   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  60.   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  61. };
  62.  
  63. // F, G, H and I are basic MD5 functions.
  64. #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  65. #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
  66. #define H(x, y, z) ((x) ^ (y) ^ (z))
  67. #define I(x, y, z) ((y) ^ ((x) | (~z)))
  68.  
  69. // ROTATE_LEFT rotates x left n bits.
  70. #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  71.  
  72. // FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
  73. // Rotation is separate from addition to prevent recomputation.
  74. #define FF(a, b, c, d, x, s, ac) { \
  75.   (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
  76.   (a) = ROTATE_LEFT ((a), (s)); \
  77.   (a) += (b); \
  78.   }
  79. #define GG(a, b, c, d, x, s, ac) { \
  80.   (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
  81.   (a) = ROTATE_LEFT ((a), (s)); \
  82.   (a) += (b); \
  83.   }
  84. #define HH(a, b, c, d, x, s, ac) { \
  85.   (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
  86.   (a) = ROTATE_LEFT ((a), (s)); \
  87.   (a) += (b); \
  88.   }
  89. #define II(a, b, c, d, x, s, ac) { \
  90.   (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
  91.   (a) = ROTATE_LEFT ((a), (s)); \
  92.   (a) += (b); \
  93.   }
  94. #pragma endregion
  95.  
  96. typedef unsigned char BYTE ;
  97.  
  98. // POINTER defines a generic pointer type
  99. typedef unsigned char *POINTER;
  100.  
  101. // UINT2 defines a two byte word
  102. typedef unsigned short int UINT2;
  103.  
  104. // UINT4 defines a four byte word
  105. typedef unsigned long int UINT4;
  106.  
  107.  
  108. // convenient object that wraps
  109. // the C-functions for use in C++ only
  110. class MD5
  111. {
  112. private:
  113.   struct __context_t {
  114.     UINT4 state[4];                                   /* state (ABCD) */
  115.     UINT4 count[2];        /* number of bits, modulo 2^64 (lsb first) */
  116.     unsigned char buffer[64];                         /* input buffer */
  117.   } context ;
  118.  
  119.   #pragma region static helper functions
  120.   // The core of the MD5 algorithm is here.
  121.   // MD5 basic transformation. Transforms state based on block.
  122.   static void MD5Transform( UINT4 state[4], unsigned char block[64] )
  123.   {
  124.     UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
  125.  
  126.     Decode (x, block, 64);
  127.  
  128.     /* Round 1 */
  129.     FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
  130.     FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
  131.     FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
  132.     FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
  133.     FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
  134.     FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
  135.     FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
  136.     FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
  137.     FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
  138.     FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
  139.     FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  140.     FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  141.     FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  142.     FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  143.     FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  144.     FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
  145.  
  146.     /* Round 2 */
  147.     GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
  148.     GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
  149.     GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  150.     GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
  151.     GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
  152.     GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
  153.     GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  154.     GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
  155.     GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
  156.     GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  157.     GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
  158.     GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
  159.     GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  160.     GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
  161.     GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
  162.     GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
  163.  
  164.     /* Round 3 */
  165.     HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
  166.     HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
  167.     HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  168.     HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  169.     HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
  170.     HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
  171.     HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
  172.     HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  173.     HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  174.     HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
  175.     HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
  176.     HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
  177.     HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
  178.     HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  179.     HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  180.     HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
  181.  
  182.     /* Round 4 */
  183.     II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
  184.     II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
  185.     II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  186.     II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
  187.     II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  188.     II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
  189.     II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  190.     II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
  191.     II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
  192.     II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  193.     II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
  194.     II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
  195.     II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
  196.     II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  197.     II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
  198.     II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
  199.  
  200.     state[0] += a;
  201.     state[1] += b;
  202.     state[2] += c;
  203.     state[3] += d;
  204.  
  205.     // Zeroize sensitive information.
  206.     memset((POINTER)x, 0, sizeof (x));
  207.   }
  208.  
  209.   // Encodes input (UINT4) into output (unsigned char). Assumes len is
  210.   // a multiple of 4.
  211.   static void Encode( unsigned char *output, UINT4 *input, unsigned int len )
  212.   {
  213.     unsigned int i, j;
  214.  
  215.     for (i = 0, j = 0; j < len; i++, j += 4) {
  216.       output[j] = (unsigned char)(input[i] & 0xff);
  217.       output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
  218.       output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
  219.       output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
  220.     }
  221.   }
  222.  
  223.   // Decodes input (unsigned char) into output (UINT4). Assumes len is
  224.   // a multiple of 4.
  225.   static void Decode( UINT4 *output, unsigned char *input, unsigned int len )
  226.   {
  227.     unsigned int i, j;
  228.  
  229.     for (i = 0, j = 0; j < len; i++, j += 4)
  230.       output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
  231.       (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
  232.   }
  233.   #pragma endregion
  234.  
  235.  
  236. public:
  237.   // MAIN FUNCTIONS
  238.   MD5()
  239.   {
  240.     Init() ;
  241.   }
  242.  
  243.   // MD5 initialization. Begins an MD5 operation, writing a new context.
  244.   void Init()
  245.   {
  246.     context.count[0] = context.count[1] = 0;
  247.  
  248.     // Load magic initialization constants.
  249.     context.state[0] = 0x67452301;
  250.     context.state[1] = 0xefcdab89;
  251.     context.state[2] = 0x98badcfe;
  252.     context.state[3] = 0x10325476;
  253.   }
  254.  
  255.   // MD5 block update operation. Continues an MD5 message-digest
  256.   // operation, processing another message block, and updating the
  257.   // context.
  258.   void Update(
  259.     unsigned char *input,   // input block
  260.     unsigned int inputLen ) // length of input block
  261.   {
  262.     unsigned int i, index, partLen;
  263.  
  264.     // Compute number of bytes mod 64
  265.     index = (unsigned int)((context.count[0] >> 3) & 0x3F);
  266.  
  267.     // Update number of bits
  268.     if ((context.count[0] += ((UINT4)inputLen << 3))
  269.       < ((UINT4)inputLen << 3))
  270.       context.count[1]++;
  271.     context.count[1] += ((UINT4)inputLen >> 29);
  272.  
  273.     partLen = 64 - index;
  274.  
  275.     // Transform as many times as possible.
  276.     if (inputLen >= partLen) {
  277.       memcpy((POINTER)&context.buffer[index], (POINTER)input, partLen);
  278.       MD5Transform (context.state, context.buffer);
  279.  
  280.       for (i = partLen; i + 63 < inputLen; i += 64)
  281.         MD5Transform (context.state, &input[i]);
  282.  
  283.       index = 0;
  284.     }
  285.     else
  286.       i = 0;
  287.  
  288.     /* Buffer remaining input */
  289.     memcpy((POINTER)&context.buffer[index], (POINTER)&input[i], inputLen-i);
  290.   }
  291.  
  292.   // MD5 finalization. Ends an MD5 message-digest operation, writing the
  293.   // the message digest and zeroizing the context.
  294.   // Writes to digestRaw
  295.   void Final()
  296.   {
  297.     unsigned char bits[8];
  298.     unsigned int index, padLen;
  299.  
  300.     // Save number of bits
  301.     Encode( bits, context.count, 8 );
  302.  
  303.     // Pad out to 56 mod 64.
  304.     index = (unsigned int)((context.count[0] >> 3) & 0x3f);
  305.     padLen = (index < 56) ? (56 - index) : (120 - index);
  306.     Update( PADDING, padLen );
  307.  
  308.     // Append length (before padding)
  309.     Update( bits, 8 );
  310.  
  311.     // Store state in digest
  312.     Encode( digestRaw, context.state, 16);
  313.  
  314.     // Zeroize sensitive information.
  315.     memset((POINTER)&context, 0, sizeof (context));
  316.  
  317.     writeToString() ;
  318.   }
  319.  
  320.   /// Buffer must be 32+1 (nul) = 33 chars long at least
  321.   void writeToString()
  322.   {
  323.     int pos ;
  324.  
  325.     for( pos = 0 ; pos < 16 ; pos++ )
  326.       sprintf( digestChars+(pos*2), "%02x", digestRaw[pos] ) ;
  327.   }
  328.  
  329.  
  330. public:
  331.   // an MD5 digest is a 16-byte number (32 hex digits)
  332.   BYTE digestRaw[ 16 ] ;
  333.  
  334.   // This version of the digest is actually
  335.   // a "printf'd" version of the digest.
  336.   char digestChars[ 33 ] ;
  337.  
  338.   /// Load a file from disk and digest it
  339.   // Digests a file and returns the result.
  340.   char* digestFile( char *filename )
  341.   {
  342.     Init() ;
  343.  
  344.     FILE *file;
  345.  
  346.     int len;
  347.     unsigned char buffer[1024] ;
  348.  
  349.     if( (file = fopen (filename, "rb")) == NULL )
  350.       printf( "%s can't be opened\n", filename ) ;
  351.     else
  352.     {
  353.       while( len = (fread( buffer, 1, 1024, file )) )
  354.         Update( buffer, len ) ;
  355.       Final();
  356.  
  357.       fclose( file );
  358.     }
  359.  
  360.     return digestChars ;
  361.   }
  362.  
  363.   /// Digests a byte-array already in memory
  364.   char* digestMemory( BYTE *memchunk, int len )
  365.   {
  366.     Init() ;
  367.     Update( memchunk, len ) ;
  368.     Final() ;
  369.  
  370.     return digestChars ;
  371.   }
  372.  
  373.   // Digests a string and prints the result.
  374.   char* digestString( char *string )
  375.   {
  376.     Init() ;
  377.     Update( (unsigned char*)string, strlen(string) ) ;
  378.     Final() ;
  379.  
  380.     return digestChars ;
  381.   }
  382. } ;
  383.  
  384. #endif
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