1. 急求 MD5的加密解密演算法，用C++實現的源代碼 高分答謝
要代碼，還是要相關的解釋資料？
---------------------------------
要代碼的話：
兩個文件：
--------------------------
1. md5.h：
#pragma once
typedef unsigned long int UINT32;
typedef unsigned short int UINT16;
/* MD5 context. */
typedef struct {
UINT32 state[4]; /* state (ABCD) */
UINT32 count[2]; /* number of bits, molo 2^64 (lsb first) */
unsigned char buffer[64]; /* input buffer */
} MD5_CTX;
void MD5Init (MD5_CTX *);
void MD5Update (MD5_CTX *, unsigned char *, unsigned int);
void MD5Final (unsigned char [16], MD5_CTX *);
--------------------------
2. md5.cpp：
#include "md5.h"
#include "memory.h"
#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 (UINT32 a[4], unsigned char b[64]);
static void Encode (unsigned char *, UINT32 *, unsigned int);
static void Decode (UINT32 *, unsigned char *, 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
};
#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) + (UINT32)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT32)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT32)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT32)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
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;
}
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] += ((UINT32)inputLen << 3))
< ((UINT32)inputLen << 3))
context->count[1]++;
context->count[1] += ((UINT32)inputLen >> 29);
partLen = 64 - index;
if (inputLen >= partLen) {
memcpy((unsigned char *)&context->buffer[index], (unsigned char *)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((unsigned char *)&context->buffer[index], (unsigned char *)&input[i],
inputLen-i);
}
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 ((unsigned char *)context, 0, sizeof (*context));
}
static void MD5Transform (UINT32 state[4], unsigned char block[64])
{
UINT32 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;
memset ((unsigned char *)x, 0, sizeof (x));
}
static void Encode (unsigned char *output, UINT32 *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);
}
}
static void Decode (UINT32 *output, unsigned char *input, unsigned int len)
{
unsigned int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = ((UINT32)input[j]) | (((UINT32)input[j+1]) << 8) |
(((UINT32)input[j+2]) << 16) | (((UINT32)input[j+3]) << 24);
}
--------------------------
就這兩個文件。使用的時候把它們加入工程或者makefile，調用時包含md5.h即可，給個簡單的例子，輸入一個字元串然後計算它的md5值並輸出，在VC6.0和GCC4.4下測試通過：
#include <stdio.h>
#include <string.h>
#include "md5.h"
int main ()
{
char tmp[128];
unsigned char digest[16];
MD5_CTX context;
scanf("%s",tmp);
MD5Init (&context);
MD5Update (&context, (unsigned char*)tmp, strlen(tmp));
MD5Final (digest,&context);
printf("MD5Value:");
for(int i=0; i<16; ++i)
{
printf("%02X",digest[i]);
}
printf("\n");
return 0;
}
2. 求生成MD5碼的c或c++代碼
自己用C語言寫的簡單的MD5演算法實現。
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <math.h>
typedef unsigned char BYTE;
typedef unsigned int UINT;
typedef UINT MD5_SUB_ARRAY[16];
typedef UINT MD5_TRANSORM_FUNC(UINT,UINT,UINT);
typedef struct
{
UINT a;
UINT b;
UINT c;
UINT d;
MD5_SUB_ARRAY sub_array;
}MD5_TRANSFORM_PARAM;
const double MAX_INT = (double)0xFFFFFFFF + 1.0;
const UINT MD5_TRANSFORM_MATRIX[4][16][3] =
{
{
{ 0, 7, 1}, { 1,12, 2}, { 2,17, 3}, { 3,22, 4},
{ 4, 7, 5}, { 5,12, 6}, { 6,17, 7}, { 7,22, 8},
{ 8, 7, 9}, { 9,12,10}, {10,17,11}, {11,22,12},
{12, 7,13}, {13,12,14}, {14,17,15}, {15,22,16},
},
{
{ 1, 5,17}, { 6, 9,18}, {11,14,19}, { 0,20,20},
{ 5, 5,21}, {10, 9,22}, {15,14,23}, { 4,20,24},
{ 9, 5,25}, {14, 9,26}, { 3,14,27}, { 8,20,28},
{13, 5,29}, { 2, 9,30}, { 7,14,31}, {12,20,32},
},
{
{5, 4, 33}, { 8,11,34}, {11,16,35},{14, 23,36},
{1, 4, 37}, { 4,11,38}, { 7,16,39},{10, 23,40},
{13,4, 41}, { 0,11,42}, { 3,16,43},{ 6, 23,44},
{9, 4, 45}, {12,11,46}, {15,16,47},{ 2, 23,48},
},
{
{ 0,6,49}, { 7,10,50}, {14,15,51},{ 5, 21,52},
{12,6,53}, { 3,10,54}, {10,15,55},{ 1, 21,56},
{ 8,6,57}, {15,10,58}, { 6,15,59},{13, 21,60},
{ 4,6,61}, {11,10,62}, { 2,15,63},{ 9, 21,64},
},
};
static UINT MD5_TRANSFORM_ARRAY[65];
void MD5_Init()
{
int x;
for(x = 1; x <= 64; x++)
{
MD5_TRANSFORM_ARRAY[x] = (UINT)(MAX_INT * fabs(sin(x)));
}
}
UINT F(UINT x,UINT y,UINT z)
{
return ((x & y) | ((~x) & z));
}
UINT G(UINT x,UINT y,UINT z)
{
return ((x & z) | (y & (~z)));
}
UINT H(UINT x,UINT y,UINT z)
{
return (x ^ y ^ z);
}
UINT I(UINT x,UINT y,UINT z)
{
return (y ^ (x | (~z)));
}
BYTE* MD5_prepare_data(const BYTE* data,int len,int* new_len)
{
int rest,fill,size;
BYTE* new_data;
UINT bit_len;
// (1) 位元組補齊
rest = len % 56;
if (rest <= 56) fill = 56 - rest;
else fill = (64 - rest) + 56;
new_data = (BYTE*)malloc(len + fill + 8);
if (NULL == new_data) return NULL;
if (len > 0) memcpy(new_data,data,len);
if (fill > 0) memset(new_data + len,0x80,1);
if (fill > 1) memset(new_data + len + 1,0,fill - 1);
size = fill + len;
// (2) 附加數據的比特長度
bit_len = len * 8;
// (64位二進制數表示的)比特長度的低32位
memset(new_data + size + 0,(bit_len & 0x000000FF), 1);
memset(new_data + size + 1,(bit_len & 0x0000FF00) >> 8, 1);
memset(new_data + size + 2,(bit_len & 0x00FF0000) >> 16,1);
memset(new_data + size + 3,(bit_len & 0xFF000000) >> 24,1);
// 不考慮比特長度超出32位無符號數表示範圍,所以高32位總是0
memset(new_data + size + 4,0,4);
*new_len = size + 8;
return new_data;
}
void MD5_transform(MD5_TRANSFORM_PARAM* param,int ring,MD5_TRANSORM_FUNC func)
{
UINT a,b,c,d,s,k,i;
UINT abcd[4];
UINT *X,*T;
int index;
abcd[0] = param->a;
abcd[1] = param->b;
abcd[2] = param->c;
abcd[3] = param->d;
X = param->sub_array;
T = MD5_TRANSFORM_ARRAY;
for(index = 0; index < 16; index++)
{
a = abcd[(3 * index + 0) % 4];
b = abcd[(3 * index + 1) % 4];
c = abcd[(3 * index + 2) % 4];
d = abcd[(3 * index + 3) % 4];
k = MD5_TRANSFORM_MATRIX[ring][index][0];
s = MD5_TRANSFORM_MATRIX[ring][index][1];
i = MD5_TRANSFORM_MATRIX[ring][index][2];
a = a + func(b,c,d) + X[k] + T[i];
a = ( a << s) | ( a >> (32 - s)); // 循環左移
a = a + b;
abcd[(3 * index + 0) % 4] = a;
}
param->a = abcd[0];
param->b = abcd[1];
param->c = abcd[2];
param->d = abcd[3];
}
int MD5(const BYTE* data,int len)
{
int x,y,new_len;
MD5_TRANSFORM_PARAM param;
UINT AA,BB,CC,DD;
BYTE* buf;
MD5_Init();
buf = MD5_prepare_data(data,len,&new_len);
if (buf == NULL) return -1;
AA = 0x67452301;
BB = 0xefcdab89;
CC = 0x98badcfe;
DD = 0x10325476;
for(x = 0; x < new_len / 64; x++)
{
param.a = AA;
param.b = BB;
param.c = CC;
param.d = DD;
for(y = 0; y < 16; y++)
{
param.sub_array[y] = buf[64 * x + 4 * y + 0];
param.sub_array[y] += buf[64 * x + 4 * y + 1] << 8;
param.sub_array[y] += buf[64 * x + 4 * y + 2] << 16;
param.sub_array[y] += buf[64 * x + 4 * y + 3] << 24;
}
MD5_transform(¶m,0,F);
MD5_transform(¶m,1,G);
MD5_transform(¶m,2,H);
MD5_transform(¶m,3,I);
AA += param.a;
BB += param.b;
CC += param.c;
DD += param.d;
}
printf("MD5(\"%s\")=",data);
printf("%02X%02X%02X%02X",
(AA & 0x000000FF),
(AA & 0x0000FF00) >> 8,
(AA & 0x00FF0000) >> 16,
(AA & 0xFF000000) >> 24);
printf("%02X%02X%02X%02X",
(BB & 0x000000FF),
(BB & 0x0000FF00) >> 8,
(BB & 0x00FF0000) >> 16,
(BB & 0xFF000000) >> 24);
printf("%02X%02X%02X%02X",
(CC & 0x000000FF),
(CC & 0x0000FF00) >> 8,
(CC & 0x00FF0000) >> 16,
(CC & 0xFF000000) >> 24);
printf("%02X%02X%02X%02X",
(DD & 0x000000FF),
(DD & 0x0000FF00) >> 8,
(DD & 0x00FF0000) >> 16,
(DD & 0xFF000000) >> 24);
printf("\n");
return 0;
}
int main()
{
MD5("",0);
MD5("a",1);
MD5("abc",3);
MD5("message digest",14);
MD5("abcdefghijklmnopqrstuvwxyz",26);
return 0;
}
3. 求一個簡單的md5加密程序C或C++代碼
C語言實現MD5演算法
#include<stdio.h>
#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 RL(x, y) (((x) << (y)) | ((x) >> (32 - (y)))) //x向左循環移y位
#define PP(x) (x<<24)|((x<<8)&0xff0000)|((x>>8)&0xff00)|(x>>24) //將x高低位互換,例如PP(aabbccdd)=ddccbbaa
#define FF(a, b, c, d, x, s, ac) a = b + (RL((a + F(b,c,d) + x + ac),s))
#define GG(a, b, c, d, x, s, ac) a = b + (RL((a + G(b,c,d) + x + ac),s))
#define HH(a, b, c, d, x, s, ac) a = b + (RL((a + H(b,c,d) + x + ac),s))
#define II(a, b, c, d, x, s, ac) a = b + (RL((a + I(b,c,d) + x + ac),s))
unsigned A,B,C,D,a,b,c,d,i,len,flen[2],x[16]; //i臨時變數,len文件長,flen[2]為64位二進製表示的文件初始長度
char filename[200]; //文件名
FILE *fp;
void md5(){ //MD5核心演算法,供64輪
a=A,b=B,c=C,d=D;
/**//* Round 1 */
FF (a, b, c, d, x[ 0], 7, 0xd76aa478); /**//* 1 */
FF (d, a, b, c, x[ 1], 12, 0xe8c7b756); /**//* 2 */
FF (c, d, a, b, x[ 2], 17, 0x242070db); /**//* 3 */
FF (b, c, d, a, x[ 3], 22, 0xc1bdceee); /**//* 4 */
FF (a, b, c, d, x[ 4], 7, 0xf57c0faf); /**//* 5 */
FF (d, a, b, c, x[ 5], 12, 0x4787c62a); /**//* 6 */
FF (c, d, a, b, x[ 6], 17, 0xa8304613); /**//* 7 */
FF (b, c, d, a, x[ 7], 22, 0xfd469501); /**//* 8 */
FF (a, b, c, d, x[ 8], 7, 0x698098d8); /**//* 9 */
FF (d, a, b, c, x[ 9], 12, 0x8b44f7af); /**//* 10 */
FF (c, d, a, b, x[10], 17, 0xffff5bb1); /**//* 11 */
FF (b, c, d, a, x[11], 22, 0x895cd7be); /**//* 12 */
FF (a, b, c, d, x[12], 7, 0x6b901122); /**//* 13 */
FF (d, a, b, c, x[13], 12, 0xfd987193); /**//* 14 */
FF (c, d, a, b, x[14], 17, 0xa679438e); /**//* 15 */
FF (b, c, d, a, x[15], 22, 0x49b40821); /**//* 16 */
/**//* Round 2 */
GG (a, b, c, d, x[ 1], 5, 0xf61e2562); /**//* 17 */
GG (d, a, b, c, x[ 6], 9, 0xc040b340); /**//* 18 */
GG (c, d, a, b, x[11], 14, 0x265e5a51); /**//* 19 */
GG (b, c, d, a, x[ 0], 20, 0xe9b6c7aa); /**//* 20 */
GG (a, b, c, d, x[ 5], 5, 0xd62f105d); /**//* 21 */
GG (d, a, b, c, x[10], 9, 0x02441453); /**//* 22 */
GG (c, d, a, b, x[15], 14, 0xd8a1e681); /**//* 23 */
GG (b, c, d, a, x[ 4], 20, 0xe7d3fbc8); /**//* 24 */
GG (a, b, c, d, x[ 9], 5, 0x21e1cde6); /**//* 25 */
GG (d, a, b, c, x[14], 9, 0xc33707d6); /**//* 26 */
GG (c, d, a, b, x[ 3], 14, 0xf4d50d87); /**//* 27 */
GG (b, c, d, a, x[ 8], 20, 0x455a14ed); /**//* 28 */
GG (a, b, c, d, x[13], 5, 0xa9e3e905); /**//* 29 */
GG (d, a, b, c, x[ 2], 9, 0xfcefa3f8); /**//* 30 */
GG (c, d, a, b, x[ 7], 14, 0x676f02d9); /**//* 31 */
GG (b, c, d, a, x[12], 20, 0x8d2a4c8a); /**//* 32 */
/**//* Round 3 */
HH (a, b, c, d, x[ 5], 4, 0xfffa3942); /**//* 33 */
HH (d, a, b, c, x[ 8], 11, 0x8771f681); /**//* 34 */
HH (c, d, a, b, x[11], 16, 0x6d9d6122); /**//* 35 */
HH (b, c, d, a, x[14], 23, 0xfde5380c); /**//* 36 */
HH (a, b, c, d, x[ 1], 4, 0xa4beea44); /**//* 37 */
HH (d, a, b, c, x[ 4], 11, 0x4bdecfa9); /**//* 38 */
HH (c, d, a, b, x[ 7], 16, 0xf6bb4b60); /**//* 39 */
HH (b, c, d, a, x[10], 23, 0xbebfbc70); /**//* 40 */
HH (a, b, c, d, x[13], 4, 0x289b7ec6); /**//* 41 */
HH (d, a, b, c, x[ 0], 11, 0xeaa127fa); /**//* 42 */
HH (c, d, a, b, x[ 3], 16, 0xd4ef3085); /**//* 43 */
HH (b, c, d, a, x[ 6], 23, 0x04881d05); /**//* 44 */
HH (a, b, c, d, x[ 9], 4, 0xd9d4d039); /**//* 45 */
HH (d, a, b, c, x[12], 11, 0xe6db99e5); /**//* 46 */
HH (c, d, a, b, x[15], 16, 0x1fa27cf8); /**//* 47 */
HH (b, c, d, a, x[ 2], 23, 0xc4ac5665); /**//* 48 */
/**//* Round 4 */
II (a, b, c, d, x[ 0], 6, 0xf4292244); /**//* 49 */
II (d, a, b, c, x[ 7], 10, 0x432aff97); /**//* 50 */
II (c, d, a, b, x[14], 15, 0xab9423a7); /**//* 51 */
II (b, c, d, a, x[ 5], 21, 0xfc93a039); /**//* 52 */
II (a, b, c, d, x[12], 6, 0x655b59c3); /**//* 53 */
II (d, a, b, c, x[ 3], 10, 0x8f0ccc92); /**//* 54 */
II (c, d, a, b, x[10], 15, 0xffeff47d); /**//* 55 */
II (b, c, d, a, x[ 1], 21, 0x85845dd1); /**//* 56 */
II (a, b, c, d, x[ 8], 6, 0x6fa87e4f); /**//* 57 */
II (d, a, b, c, x[15], 10, 0xfe2ce6e0); /**//* 58 */
II (c, d, a, b, x[ 6], 15, 0xa3014314); /**//* 59 */
II (b, c, d, a, x[13], 21, 0x4e0811a1); /**//* 60 */
II (a, b, c, d, x[ 4], 6, 0xf7537e82); /**//* 61 */
II (d, a, b, c, x[11], 10, 0xbd3af235); /**//* 62 */
II (c, d, a, b, x[ 2], 15, 0x2ad7d2bb); /**//* 63 */
II (b, c, d, a, x[ 9], 21, 0xeb86d391); /**//* 64 */
A += a;
B += b;
C += c;
D += d;
}
main(){
while(1){
printf("Input file:");
gets(filename); //用get函數,避免scanf以空格分割數據,
if (filename[0]==34) filename[strlen(filename)-1]=0,strcpy(filename,filename+1); //支持文件拖曳,但會多出雙引號,這里是處理多餘的雙引號
if (!strcmp(filename,"exit")) exit(0); //輸入exit退出
if (!(fp=fopen(filename,"rb"))) {printf("Can not open this file!\n");continue;} //以二進制打開文件
fseek(fp, 0, SEEK_END); //文件指針轉到文件末尾
if((len=ftell(fp))==-1) {printf("Sorry! Can not calculate files which larger than 2 GB!\n");fclose(fp);continue;} //ftell函數返回long,最大為2GB,超出返回-1
rewind(fp); //文件指針復位到文件頭
A=0x67452301,B=0xefcdab89,C=0x98badcfe,D=0x10325476; //初始化鏈接變數
flen[1]=len/0x20000000; //flen單位是bit
flen[0]=(len%0x20000000)*8;
memset(x,0,64); //初始化x數組為0
fread(&x,4,16,fp); //以4位元組為一組,讀取16組數據
for(i=0;i<len/64;i++){ //循環運算直至文件結束
md5();
memset(x,0,64);
fread(&x,4,16,fp);
}
((char*)x)[len%64]=128; //文件結束補1,補0操作,128二進制即10000000
if(len%64>55) md5(),memset(x,0,64);
memcpy(x+14,flen,8); //文件末尾加入原文件的bit長度
md5();
fclose(fp);
printf("MD5 Code:%08x%08x%08x%08x\n",PP(A),PP(B),PP(C),PP(D)); //高低位逆反輸出
}
}