user-0 提问: 求 VC C++ MD5加密算法及计算实例

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user: user-1
content: #include "global.h" #include "md5.h"  /* Constants for MD5Transform routine. */ #define S11 7 #define S12 12 #define S13 17 #define S14 22 #define S21 5 #define S22 9 #define S23 14 #define S24 20 #define S31 4 #define S32 11 #define S33 16 #define S34 23 #define S41 6 #define S42 10 #define S43 15 #define S44 21  static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64])); static void Encode PROTO_LIST   ((unsigned char *, UINT4 *, unsigned int)); static void Decode PROTO_LIST   ((UINT4 *, unsigned char *, unsigned int)); static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int)); static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));  static unsigned char PADDING[64] = {   0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };  /* F, G, H and I are basic MD5 functions. */ #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) #define H(x, y, z) ((x) ^ (y) ^ (z)) #define I(x, y, z) ((y) ^ ((x) | (~z)))  /* ROTATE_LEFT rotates x left n bits. */ #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))  /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent recomputation. */ #define FF(a, b, c, d, x, s, ac) { \ (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \   } #define GG(a, b, c, d, x, s, ac) { \ (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \   } #define HH(a, b, c, d, x, s, ac) { \ (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \   } #define II(a, b, c, d, x, s, ac) { \ (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \   }  /* MD5 initialization. Begins an MD5 operation, writing a new context. */ void MD5Init (context) MD5_CTX *context;                                        /* context */ {   context->count[0] = context->count[1] = 0;   /* Load magic initialization constants. */   context->state[0] = 0x67452301;   context->state[1] = 0xefcdab89;   context->state[2] = 0x98badcfe;   context->state[3] = 0x10325476; }  /* MD5 block update operation. Continues an MD5 message-digest   operation, processing another message block, and updating the   context. */ void MD5Update (context, input, inputLen) MD5_CTX *context;                                        /* context */ unsigned char *input;                                /* input block */ unsigned int inputLen;                    /* length of input block */ {   unsigned int i, index, partLen;    /* Compute number of bytes mod 64 */   index = (unsigned int)((context->count[0] >> 3) & 0x3F);    /* Update number of bits */   if ((context->count[0] += ((UINT4)inputLen << 3))   < ((UINT4)inputLen << 3)) context->count[1]++;   context->count[1] += ((UINT4)inputLen >> 29);    partLen = 64 - index;    /* Transform as many times as possible. */   if (inputLen >= partLen) { MD5_memcpy   ((POINTER)&context->buffer[index], (POINTER)input, partLen); MD5Transform (context->state, context->buffer);  for (i = partLen; i + 63 < inputLen; i += 64)   MD5Transform (context->state, &input[i]);  index = 0;   }   else i = 0;    /* Buffer remaining input */   MD5_memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i],   inputLen-i); }  /* MD5 finalization. Ends an MD5 message-digest operation, writing the   the message digest and zeroizing the context. */ void MD5Final (digest, context) unsigned char digest[16];                        /* message digest */ MD5_CTX *context;                                      /* context */ {   unsigned char bits[8];   unsigned int index, padLen;    /* Save number of bits */   Encode (bits, context->count, 8);    /* Pad out to 56 mod 64. */   index = (unsigned int)((context->count[0] >> 3) & 0x3f);   padLen = (index < 56) ? (56 - index) : (120 - index);   MD5Update (context, PADDING, padLen);    /* Append length (before padding) */   MD5Update (context, bits, 8);   /* Store state in digest */   Encode (digest, context->state, 16);    /* Zeroize sensitive information. */   MD5_memset ((POINTER)context, 0, sizeof (*context)); }  /* MD5 basic transformation. Transforms state based on block. */ static void MD5Transform (state, block) UINT4 state[4]; unsigned char block[64]; {   UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];    Decode (x, block, 64);    /* Round 1 */   FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */   FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */   FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */   FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */   FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */   FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */   FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */   FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */   FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */   FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */   FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */   FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */   FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */   FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */   FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */   FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */  /* Round 2 */   GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */   GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */   GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */   GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */   GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */   GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */   GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */   GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */   GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */   GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */   GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */   GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */   GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */   GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */   GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */   GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */    /* Round 3 */   HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */   HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */   HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */   HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */   HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */   HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */   HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */   HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */   HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */   HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */   HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */   HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */   HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */   HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */   HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */   HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */    /* Round 4 */   II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */   II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */   II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */   II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */   II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */   II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */   II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */   II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */   II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */   II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */   II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */   II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */   II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */   II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */   II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */   II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */    state[0] += a;   state[1] += b;   state[2] += c;   state[3] += d;    /* Zeroize sensitive information. */   MD5_memset ((POINTER)x, 0, sizeof (x)); }  /* Encodes input (UINT4) into output (unsigned char). Assumes len is   a multiple of 4. */ static void Encode (output, input, len) unsigned char *output; UINT4 *input; unsigned int len; {   unsigned int i, j;    for (i = 0, j = 0; j < len; i++, j += 4) { output[j] = (unsigned char)(input[i] & 0xff); output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);   } }  /* Decodes input (unsigned char) into output (UINT4). Assumes len is   a multiple of 4. */ static void Decode (output, input, len) UINT4 *output; unsigned char *input; unsigned int len; {   unsigned int i, j;    for (i = 0, j = 0; j < len; i++, j += 4) output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |   (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); }  /* Note: Replace "for loop" with standard memcpy if possible. */  static void MD5_memcpy (output, input, len) POINTER output; POINTER input; unsigned int len; {   unsigned int i;    for (i = 0; i < len; i++) output[i] = input[i]; }  /* Note: Replace "for loop" with standard memset if possible. */ static void MD5_memset (output, value, len) POINTER output; int value; unsigned int len; {   unsigned int i;    for (i = 0; i < len; i++) ((char *)output)[i] = (char)value; }