在线计算md5

https://md5jiami.bmcx.com/

程序参考

#include <stdio.h>
#include <stdint.h>
#include <string.h>#define ROTATELEFT(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))/*** @desc: convert message and mes_bkp string into integer array and store them in w*/
static void md5_process_part1(uint32_t *w, unsigned char *message, uint32_t *pos, uint32_t mes_len, const unsigned char *mes_bkp)
{uint32_t i; // used in for loopfor(i = 0; i <= 15; i++){int32_t count = 0;while(*pos < mes_len && count <= 24){w[i] += (((uint32_t)message[*pos]) << count);(*pos)++;count += 8;}while(count <= 24){w[i] += (((uint32_t)mes_bkp[*pos - mes_len]) << count);(*pos)++;count += 8;}}
}/*** @desc: start encryption based on w*/
static void md5_process_part2(uint32_t abcd[4], uint32_t *w, const uint32_t k[64], const uint32_t s[64])
{uint32_t i; // used in for loopuint32_t a = abcd[0];uint32_t b = abcd[1];uint32_t c = abcd[2];uint32_t d = abcd[3];uint32_t f = 0;uint32_t g = 0;for(i = 0; i < 64; i++){if(i >= 0 && i <= 15){f = (b & c) | ((~b) & d);g = i;}else if(i >= 16 && i <= 31){f = (d & b) | ((~d) & c);g = (5 * i + 1) % 16;}else if(i >= 32 && i <= 47){f = b ^ c ^ d;g = (3 * i + 5) % 16;}else if(i >= 48 && i <= 63){f = c ^ (b | (~d));g = (7 * i) % 16;}uint32_t temp = d;d = c;c = b;b = ROTATELEFT((a + f + k[i] + w[g]), s[i]) + b;a = temp;}abcd[0] += a;abcd[1] += b;abcd[2] += c;abcd[3] += d;
}static const uint32_t k_table[]={0xd76aa478,0xe8c7b756,0x242070db,0xc1bdceee,0xf57c0faf,0x4787c62a,0xa8304613,0xfd469501,0x698098d8,0x8b44f7af,0xffff5bb1,0x895cd7be,0x6b901122,0xfd987193,0xa679438e,0x49b40821,0xf61e2562,0xc040b340,0x265e5a51,0xe9b6c7aa,0xd62f105d,0x02441453,0xd8a1e681,0xe7d3fbc8,0x21e1cde6,0xc33707d6,0xf4d50d87,0x455a14ed,0xa9e3e905,0xfcefa3f8,0x676f02d9,0x8d2a4c8a,0xfffa3942,0x8771f681,0x6d9d6122,0xfde5380c,0xa4beea44,0x4bdecfa9,0xf6bb4b60,0xbebfbc70,0x289b7ec6,0xeaa127fa,0xd4ef3085,0x04881d05,0xd9d4d039,0xe6db99e5,0x1fa27cf8,0xc4ac5665,0xf4292244,0x432aff97,0xab9423a7,0xfc93a039,0x655b59c3,0x8f0ccc92,0xffeff47d,0x85845dd1,0x6fa87e4f,0xfe2ce6e0,0xa3014314,0x4e0811a1,0xf7537e82,0xbd3af235,0x2ad7d2bb,0xeb86d391
};static const uint32_t s_table[]={7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21
};int32_t cal_md5(unsigned char *result, unsigned char *data, int length)
{if (result == NULL){return 1;}uint32_t w[16];uint32_t i; // used in for loopuint32_t mes_len = length;uint32_t looptimes = (mes_len + 8) / 64 + 1;uint32_t abcd[] = {0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476};uint32_t pos = 0; // position pointer for messageuint32_t bkp_len = 64 * looptimes - mes_len; // 经过计算发现不超过72//    unsigned char *bkp_mes = (unsigned char *)calloc(1, bkp_len);unsigned char bkp_mes[80];for(int i = 0; i < 80; i++) //初始化{bkp_mes[i] = 0;}bkp_mes[0] = (unsigned char)(0x80);uint64_t mes_bit_len = ((uint64_t)mes_len) * 8;for(i = 0; i < 8; i++){bkp_mes[bkp_len-i-1] = (unsigned char)((mes_bit_len & (0x00000000000000FF << (8 * (7 - i)))) >> (8 * (7 - i)));}for(i = 0; i < looptimes; i++){for(int j = 0; j < 16; j++) //初始化{w[j] = 0x00000000;}md5_process_part1(w, data, &pos, mes_len, bkp_mes); // compute wmd5_process_part2(abcd, w, k_table, s_table); // calculate md5 and store the result in abcd}for(int i = 0; i < 16; i++){result[i] = ((unsigned char*)abcd)[i];}return 0;
}int32_t main(void)
{uint8_t result[41]={0};int32_t ret = -1;uint32_t i =0;//test 1ret = cal_md5(result, "abcdegfhijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz123", strlen("abcdegfhijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz123"));printf("ret=%d\n", ret);if(ret == 0){printf("get md5 successful!\n");for(i=0; i<strlen(result); i++){printf("%#x ", result[i]);}printf("\n");}else{printf("get md5 failed!\n");}
}

输出结果如下

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32位的md5校验程序

在线计算md5

程序参考

输出结果如下

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