C语言实现MD5算法

#include <stdio.h>#include <stdlib.h>#include <time.h>#include <string.h>typedef unsigned char *POINTER;typedef unsigned short int UINT2;typedef unsigned long int UINT4;typedef struct{  UINT4 state[4];  UINT4 count[2];  unsigned char buffer[64];} MD5_CTX;void MD5Init(MD5_CTX *);void MD5Update(MD5_CTX *, unsigned char *, unsigned int);void MD5Final(unsigned char [16], MD5_CTX *);#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 21static 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};#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)))#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))#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); }inline void Encode(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);  }}inline void Decode(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);}inline void MD5Transform (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);  FF (a, b, c, d, x[ 0], S11, 0xd76aa478);  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756);  FF (c, d, a, b, x[ 2], S13, 0x242070db);  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee);  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf);  FF (d, a, b, c, x[ 5], S12, 0x4787c62a);  FF (c, d, a, b, x[ 6], S13, 0xa8304613);  FF (b, c, d, a, x[ 7], S14, 0xfd469501);  FF (a, b, c, d, x[ 8], S11, 0x698098d8);  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af);  FF (c, d, a, b, x[10], S13, 0xffff5bb1);  FF (b, c, d, a, x[11], S14, 0x895cd7be);  FF (a, b, c, d, x[12], S11, 0x6b901122);  FF (d, a, b, c, x[13], S12, 0xfd987193);  FF (c, d, a, b, x[14], S13, 0xa679438e);  FF (b, c, d, a, x[15], S14, 0x49b40821);  GG (a, b, c, d, x[ 1], S21, 0xf61e2562);  GG (d, a, b, c, x[ 6], S22, 0xc040b340);  GG (c, d, a, b, x[11], S23, 0x265e5a51);  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa);  GG (a, b, c, d, x[ 5], S21, 0xd62f105d);  GG (d, a, b, c, x[10], S22,   0x2441453);  GG (c, d, a, b, x[15], S23, 0xd8a1e681);  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8);  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6);  GG (d, a, b, c, x[14], S22, 0xc33707d6);  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87);  GG (b, c, d, a, x[ 8], S24, 0x455a14ed);  GG (a, b, c, d, x[13], S21, 0xa9e3e905);  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8);  GG (c, d, a, b, x[ 7], S23, 0x676f02d9);  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a);  HH (a, b, c, d, x[ 5], S31, 0xfffa3942);  HH (d, a, b, c, x[ 8], S32, 0x8771f681);  HH (c, d, a, b, x[11], S33, 0x6d9d6122);  HH (b, c, d, a, x[14], S34, 0xfde5380c);  HH (a, b, c, d, x[ 1], S31, 0xa4beea44);  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9);  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60);  HH (b, c, d, a, x[10], S34, 0xbebfbc70);  HH (a, b, c, d, x[13], S31, 0x289b7ec6);  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa);  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085);  HH (b, c, d, a, x[ 6], S34,   0x4881d05);  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039);  HH (d, a, b, c, x[12], S32, 0xe6db99e5);  HH (c, d, a, b, x[15], S33, 0x1fa27cf8);  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665);  II (a, b, c, d, x[ 0], S41, 0xf4292244);  II (d, a, b, c, x[ 7], S42, 0x432aff97);  II (c, d, a, b, x[14], S43, 0xab9423a7);  II (b, c, d, a, x[ 5], S44, 0xfc93a039);  II (a, b, c, d, x[12], S41, 0x655b59c3);  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92);  II (c, d, a, b, x[10], S43, 0xffeff47d);  II (b, c, d, a, x[ 1], S44, 0x85845dd1);  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f);  II (d, a, b, c, x[15], S42, 0xfe2ce6e0);  II (c, d, a, b, x[ 6], S43, 0xa3014314);  II (b, c, d, a, x[13], S44, 0x4e0811a1);  II (a, b, c, d, x[ 4], S41, 0xf7537e82);  II (d, a, b, c, x[11], S42, 0xbd3af235);  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb);  II (b, c, d, a, x[ 9], S44, 0xeb86d391);  state[0] += a;  state[1] += b;  state[2] += c;  state[3] += d;  memset ((POINTER)x, 0, sizeof (x));  }inline void MD5Init(MD5_CTX *context){  context->count[0] = context->count[1] = 0;  context->state[0] = 0x67452301;  context->state[1] = 0xefcdab89;  context->state[2] = 0x98badcfe;  context->state[3] = 0x10325476;}inline void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputLen){  unsigned int i, index, partLen;  index = (unsigned int)((context->count[0] >> 3) & 0x3F);  if ((context->count[0] += ((UINT4)inputLen << 3))  < ((UINT4)inputLen << 3))  context->count[1]++;  context->count[1] += ((UINT4)inputLen >> 29);  partLen = 64 - index;  if (inputLen >= partLen) {  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;  memcpy((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);}inline void MD5Final(unsigned char digest[16], MD5_CTX *context){  unsigned char bits[8];  unsigned int index, padLen;  Encode (bits, context->count, 8);  index = (unsigned int)((context->count[0] >> 3) & 0x3f);  padLen = (index < 56) ? (56 - index) : (120 - index);  MD5Update (context, PADDING, padLen);  MD5Update (context, bits, 8);  Encode (digest, context->state, 16);  memset ((POINTER)context, 0, sizeof (*context));  }void MD5Digest(char *pszInput, unsigned long nInputSize, char *pszOutPut){  MD5_CTX context;  MD5Init (&context);  MD5Update (&context, (unsigned char *)pszInput, nInputSize);  MD5Final ((unsigned char *)pszOutPut, &context);}#define MAX_SIZE (1024*1024)int main(){ char szDigest[16];  char encrypt[MAX_SIZE];  FILE *fp = fopen("./htxa_update.zip", "rb");  if(fp == NULL)  {      printf("can not open file\n");      return -1;  }  fseek(fp, 0, SEEK_END);  int size = ftell(fp);  fseek(fp, 0, SEEK_SET);  memset(encrypt, 0, sizeof(encrypt));  int len = fread(encrypt, sizeof(char), size, fp);  printf("size:%d,len:%d\n", size, len);  printf("\nencrytion:");  MD5Digest(encrypt, size,szDigest);  int i;  for (i=0;i<16;i++)      printf ("%02X",(unsigned char)szDigest[i]);  //getchar();  return 0;}