md5信息摘要算法 c++
接上,用c++实现md5算法:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
#include <string.h> #include <stdio.h> #include <math.h> #include <stdlib.h> #include <float.h> #include <limits.h> #include <ctype.h> #include "md5.h" unsigned char PADDING[] = { 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 }; void MD5Init(MD5_CTX *context) { context->count[0] = 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 = 0, index = 0, partlen = 0; index = (context->count[0] >> 3) & 0x3F; partlen = 64 - index; context->count[0] += inputlen << 3; if (context->count[0] < (inputlen << 3)) context->count[1]++; context->count[1] += inputlen >> 29; if (inputlen >= partlen) { memcpy(&context->buffer[index], input, partlen); MD5Transform(context->state, context->buffer); for (i = partlen; i + 64 <= inputlen; i += 64) MD5Transform(context->state, &input[i]); index = 0; } else { i = 0; } memcpy(&context->buffer[index], &input[i], inputlen - i); } void MD5Final(MD5_CTX *context, unsigned char digest[16]) { unsigned int index = 0, padlen = 0; unsigned char bits[8]; index = (context->count[0] >> 3) & 0x3F; padlen = (index < 56) ? (56 - index) : (120 - index); MD5Encode(bits, context->count, 8); MD5Update(context, PADDING, padlen); MD5Update(context, bits, 8); MD5Encode(digest, context->state, 16); } void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len) { unsigned int i = 0, j = 0; while (j < len) { output[j] = input[i] & 0xFF; output[j + 1] = (input[i] >> 8) & 0xFF; output[j + 2] = (input[i] >> 16) & 0xFF; output[j + 3] = (input[i] >> 24) & 0xFF; i++; j += 4; } } void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len) { unsigned int i = 0, j = 0; while (j < len) { output[i] = (input[j]) | ((unsigned int)input[j + 1] << 8) | ((unsigned int)input[j + 2] << 16) | ((unsigned int)input[j + 3] << 24); i++; j += 4; } } void MD5Transform(unsigned int state[4], unsigned char block[64]) { unsigned int a = state[0]; unsigned int b = state[1]; unsigned int c = state[2]; unsigned int d = state[3]; unsigned int x[64]; MD5Decode(x, block, 64); 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, 0x2441453); /* 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, 0x4881d05); /* 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 */ state[0] += a; state[1] += b; state[2] += c; state[3] += d; } void md5_test(unsigned char *pInputBuf,unsigned int inputLength, unsigned char *pOutputBuf) { //object define MD5_CTX my_md5; //init object MD5Init(&my_md5); //encoding MD5Update(&my_md5, pInputBuf, inputLength); MD5Final(&my_md5, pOutputBuf); } //==================== end of file ========================
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
#ifndef MD5_H #define MD5_H typedef struct { unsigned int count[2]; unsigned int state[4]; unsigned char buffer[64]; }MD5_CTX; #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 + ac; \ a = ROTATE_LEFT(a, s); \ a += b; \ } #define GG(a,b,c,d,x,s,ac) \ { \ a += G(b, c, d) + x + ac; \ a = ROTATE_LEFT(a, s); \ a += b; \ } #define HH(a,b,c,d,x,s,ac) \ { \ a += H(b, c, d) + x + ac; \ a = ROTATE_LEFT(a, s); \ a += b; \ } #define II(a,b,c,d,x,s,ac) \ { \ a += I(b, c, d) + x + ac; \ a = ROTATE_LEFT(a, s); \ a += b; \ } void MD5Init(MD5_CTX *context); void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen); void MD5Final(MD5_CTX *context, unsigned char digest[16]); void MD5Transform(unsigned int state[4], unsigned char block[64]); void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len); void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len); void md5_test(unsigned char *pInputBuf, unsigned int inputLength, unsigned char *pOutputBuf); #endif //================ end of file =====================
应用:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
#include<iostream> #include <iomanip> #include <string> #include <stdio.h> #include <time.h> #include <windows.h> //user includer #include "md5.h" using namespace std; unsigned char plaintext_bytes[] = "admin";//after encoding: 21232f297a57a5a743894a0e4a801fc3 unsigned char ciphertext_bytes[16]; int main(int argc, char* argv[]) { unsigned char checksum = 0x5; md5_test(plaintext_bytes, strlen((char*)plaintext_bytes), ciphertext_bytes); cout << plaintext_bytes << endl; for each (unsigned int var in ciphertext_bytes) { cout.fill('0'); cout.width(2); cout << setiosflags(ios::uppercase) << hex << var; } cout << endl; system("pause"); return 0; }
运行:
谢谢.
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