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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Compute-file-or-string-md5 - C 2 | ================================ 3 | 4 | Compute md5 value of file or string. 5 | 6 | Try the following: 7 | 8 | $ gcc main_md5.c md5.c -Wall -o md5_test 9 | 10 | $ ./md5_test 11 | 12 | // you may get following: 13 | 14 | [file - md5.c] md5 value: 15 | 16 | 2a2caf52cb298f177a57a3211213e141 17 | 18 | [string - gchinaran@gmail.com] md5 value: 19 | 20 | 84701974fb98315895e3ed9053a0b389 21 | 22 | // and you can check by md5sum 23 | 24 | $ md5sum md5.c 25 | 26 | 2a2caf52cb298f177a57a3211213e141 md5.c 27 | 28 | // Last: 16-digit md5 is the middle of 32-digit md5 29 | 30 | -------------------------------------------------------------------------------- /main_md5.c: -------------------------------------------------------------------------------- 1 | #include "md5.h" 2 | 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | 11 | #define READ_DATA_SIZE 1024 12 | #define MD5_SIZE 16 13 | #define MD5_STR_LEN (MD5_SIZE * 2) 14 | 15 | // function declare 16 | int Compute_string_md5(unsigned char *dest_str, unsigned int dest_len, char *md5_str); 17 | int Compute_file_md5(const char *file_path, char *md5_str); 18 | 19 | /************** main test **************/ 20 | int main(int argc, char *argv[]) 21 | { 22 | int ret; 23 | const char *file_path = "md5.c"; 24 | char md5_str[MD5_STR_LEN + 1]; 25 | const char *test_str = "gchinaran@gmail.com"; 26 | 27 | // test file md5 28 | ret = Compute_file_md5(file_path, md5_str); 29 | if (0 == ret) 30 | { 31 | printf("[file - %s] md5 value:\n", file_path); 32 | printf("%s\n", md5_str); 33 | } 34 | 35 | // test string md5 36 | Compute_string_md5((unsigned char *)test_str, strlen(test_str), md5_str); 37 | printf("[string - %s] md5 value:\n", test_str); 38 | printf("%s\n", md5_str); 39 | 40 | return 0; 41 | } 42 | 43 | /** 44 | * compute the value of a string 45 | * @param dest_str 46 | * @param dest_len 47 | * @param md5_str 48 | */ 49 | int Compute_string_md5(unsigned char *dest_str, unsigned int dest_len, char *md5_str) 50 | { 51 | int i; 52 | unsigned char md5_value[MD5_SIZE]; 53 | MD5_CTX md5; 54 | 55 | // init md5 56 | MD5Init(&md5); 57 | 58 | MD5Update(&md5, dest_str, dest_len); 59 | 60 | MD5Final(&md5, md5_value); 61 | 62 | // convert md5 value to md5 string 63 | for(i = 0; i < MD5_SIZE; i++) 64 | { 65 | snprintf(md5_str + i*2, 2+1, "%02x", md5_value[i]); 66 | } 67 | 68 | return 0; 69 | } 70 | 71 | /** 72 | * compute the value of a file 73 | * @param file_path 74 | * @param md5_str 75 | * @return 0: ok, -1: fail 76 | */ 77 | int Compute_file_md5(const char *file_path, char *md5_str) 78 | { 79 | int i; 80 | int fd; 81 | int ret; 82 | unsigned char data[READ_DATA_SIZE]; 83 | unsigned char md5_value[MD5_SIZE]; 84 | MD5_CTX md5; 85 | 86 | fd = open(file_path, O_RDONLY); 87 | if (-1 == fd) 88 | { 89 | perror("open"); 90 | return -1; 91 | } 92 | 93 | // init md5 94 | MD5Init(&md5); 95 | 96 | while (1) 97 | { 98 | ret = read(fd, data, READ_DATA_SIZE); 99 | if (-1 == ret) 100 | { 101 | perror("read"); 102 | close(fd); 103 | return -1; 104 | } 105 | 106 | MD5Update(&md5, data, ret); 107 | 108 | if (0 == ret || ret < READ_DATA_SIZE) 109 | { 110 | break; 111 | } 112 | } 113 | 114 | close(fd); 115 | 116 | MD5Final(&md5, md5_value); 117 | 118 | // convert md5 value to md5 string 119 | for(i = 0; i < MD5_SIZE; i++) 120 | { 121 | snprintf(md5_str + i*2, 2+1, "%02x", md5_value[i]); 122 | } 123 | 124 | return 0; 125 | } 126 | 127 | -------------------------------------------------------------------------------- /md5.c: -------------------------------------------------------------------------------- 1 | #include "md5.h" 2 | #include 3 | 4 | unsigned char PADDING[] = 5 | { 6 | 0x80,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 7 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 8 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 9 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 10 | }; 11 | 12 | void MD5Init(MD5_CTX *context) 13 | { 14 | context->count[0] = 0; 15 | context->count[1] = 0; 16 | context->state[0] = 0x67452301; 17 | context->state[1] = 0xEFCDAB89; 18 | context->state[2] = 0x98BADCFE; 19 | context->state[3] = 0x10325476; 20 | } 21 | 22 | void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen) 23 | { 24 | unsigned int i = 0; 25 | unsigned int index = 0; 26 | unsigned int partlen = 0; 27 | 28 | index = (context->count[0] >> 3) & 0x3F; 29 | partlen = 64 - index; 30 | context->count[0] += inputlen << 3; 31 | 32 | if(context->count[0] < (inputlen << 3)) 33 | context->count[1]++; 34 | context->count[1] += inputlen >> 29; 35 | 36 | if(inputlen >= partlen) 37 | { 38 | memcpy(&context->buffer[index], input,partlen); 39 | MD5Transform(context->state, context->buffer); 40 | 41 | for(i = partlen; i+64 <= inputlen; i+=64) 42 | MD5Transform(context->state, &input[i]); 43 | 44 | index = 0; 45 | } 46 | else 47 | { 48 | i = 0; 49 | } 50 | memcpy(&context->buffer[index], &input[i], inputlen-i); 51 | } 52 | 53 | void MD5Final(MD5_CTX *context, unsigned char digest[16]) 54 | { 55 | unsigned int index = 0,padlen = 0; 56 | unsigned char bits[8]; 57 | 58 | index = (context->count[0] >> 3) & 0x3F; 59 | padlen = (index < 56)?(56-index):(120-index); 60 | MD5Encode(bits, context->count, 8); 61 | MD5Update(context, PADDING, padlen); 62 | MD5Update(context, bits, 8); 63 | MD5Encode(digest, context->state, 16); 64 | } 65 | 66 | void MD5Encode(unsigned char *output,unsigned int *input,unsigned int len) 67 | { 68 | unsigned int i = 0; 69 | unsigned int j = 0; 70 | 71 | while(j < len) 72 | { 73 | output[j] = input[i] & 0xFF; 74 | output[j+1] = (input[i] >> 8) & 0xFF; 75 | output[j+2] = (input[i] >> 16) & 0xFF; 76 | output[j+3] = (input[i] >> 24) & 0xFF; 77 | i++; 78 | j += 4; 79 | } 80 | } 81 | 82 | void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len) 83 | { 84 | unsigned int i = 0; 85 | unsigned int j = 0; 86 | 87 | while(j < len) 88 | { 89 | output[i] = (input[j]) | 90 | (input[j+1] << 8) | 91 | (input[j+2] << 16) | 92 | (input[j+3] << 24); 93 | i++; 94 | j += 4; 95 | } 96 | } 97 | 98 | void MD5Transform(unsigned int state[4], unsigned char block[64]) 99 | { 100 | unsigned int a = state[0]; 101 | unsigned int b = state[1]; 102 | unsigned int c = state[2]; 103 | unsigned int d = state[3]; 104 | unsigned int x[64]; 105 | 106 | MD5Decode(x,block,64); 107 | 108 | FF(a, b, c, d, x[ 0], 7, 0xd76aa478); /* 1 */ 109 | FF(d, a, b, c, x[ 1], 12, 0xe8c7b756); /* 2 */ 110 | FF(c, d, a, b, x[ 2], 17, 0x242070db); /* 3 */ 111 | FF(b, c, d, a, x[ 3], 22, 0xc1bdceee); /* 4 */ 112 | FF(a, b, c, d, x[ 4], 7, 0xf57c0faf); /* 5 */ 113 | FF(d, a, b, c, x[ 5], 12, 0x4787c62a); /* 6 */ 114 | FF(c, d, a, b, x[ 6], 17, 0xa8304613); /* 7 */ 115 | FF(b, c, d, a, x[ 7], 22, 0xfd469501); /* 8 */ 116 | FF(a, b, c, d, x[ 8], 7, 0x698098d8); /* 9 */ 117 | FF(d, a, b, c, x[ 9], 12, 0x8b44f7af); /* 10 */ 118 | FF(c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */ 119 | FF(b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */ 120 | FF(a, b, c, d, x[12], 7, 0x6b901122); /* 13 */ 121 | FF(d, a, b, c, x[13], 12, 0xfd987193); /* 14 */ 122 | FF(c, d, a, b, x[14], 17, 0xa679438e); /* 15 */ 123 | FF(b, c, d, a, x[15], 22, 0x49b40821); /* 16 */ 124 | 125 | /* Round 2 */ 126 | GG(a, b, c, d, x[ 1], 5, 0xf61e2562); /* 17 */ 127 | GG(d, a, b, c, x[ 6], 9, 0xc040b340); /* 18 */ 128 | GG(c, d, a, b, x[11], 14, 0x265e5a51); /* 19 */ 129 | GG(b, c, d, a, x[ 0], 20, 0xe9b6c7aa); /* 20 */ 130 | GG(a, b, c, d, x[ 5], 5, 0xd62f105d); /* 21 */ 131 | GG(d, a, b, c, x[10], 9, 0x2441453); /* 22 */ 132 | GG(c, d, a, b, x[15], 14, 0xd8a1e681); /* 23 */ 133 | GG(b, c, d, a, x[ 4], 20, 0xe7d3fbc8); /* 24 */ 134 | GG(a, b, c, d, x[ 9], 5, 0x21e1cde6); /* 25 */ 135 | GG(d, a, b, c, x[14], 9, 0xc33707d6); /* 26 */ 136 | GG(c, d, a, b, x[ 3], 14, 0xf4d50d87); /* 27 */ 137 | GG(b, c, d, a, x[ 8], 20, 0x455a14ed); /* 28 */ 138 | GG(a, b, c, d, x[13], 5, 0xa9e3e905); /* 29 */ 139 | GG(d, a, b, c, x[ 2], 9, 0xfcefa3f8); /* 30 */ 140 | GG(c, d, a, b, x[ 7], 14, 0x676f02d9); /* 31 */ 141 | GG(b, c, d, a, x[12], 20, 0x8d2a4c8a); /* 32 */ 142 | 143 | /* Round 3 */ 144 | HH(a, b, c, d, x[ 5], 4, 0xfffa3942); /* 33 */ 145 | HH(d, a, b, c, x[ 8], 11, 0x8771f681); /* 34 */ 146 | HH(c, d, a, b, x[11], 16, 0x6d9d6122); /* 35 */ 147 | HH(b, c, d, a, x[14], 23, 0xfde5380c); /* 36 */ 148 | HH(a, b, c, d, x[ 1], 4, 0xa4beea44); /* 37 */ 149 | HH(d, a, b, c, x[ 4], 11, 0x4bdecfa9); /* 38 */ 150 | HH(c, d, a, b, x[ 7], 16, 0xf6bb4b60); /* 39 */ 151 | HH(b, c, d, a, x[10], 23, 0xbebfbc70); /* 40 */ 152 | HH(a, b, c, d, x[13], 4, 0x289b7ec6); /* 41 */ 153 | HH(d, a, b, c, x[ 0], 11, 0xeaa127fa); /* 42 */ 154 | HH(c, d, a, b, x[ 3], 16, 0xd4ef3085); /* 43 */ 155 | HH(b, c, d, a, x[ 6], 23, 0x4881d05); /* 44 */ 156 | HH(a, b, c, d, x[ 9], 4, 0xd9d4d039); /* 45 */ 157 | HH(d, a, b, c, x[12], 11, 0xe6db99e5); /* 46 */ 158 | HH(c, d, a, b, x[15], 16, 0x1fa27cf8); /* 47 */ 159 | HH(b, c, d, a, x[ 2], 23, 0xc4ac5665); /* 48 */ 160 | 161 | /* Round 4 */ 162 | II(a, b, c, d, x[ 0], 6, 0xf4292244); /* 49 */ 163 | II(d, a, b, c, x[ 7], 10, 0x432aff97); /* 50 */ 164 | II(c, d, a, b, x[14], 15, 0xab9423a7); /* 51 */ 165 | II(b, c, d, a, x[ 5], 21, 0xfc93a039); /* 52 */ 166 | II(a, b, c, d, x[12], 6, 0x655b59c3); /* 53 */ 167 | II(d, a, b, c, x[ 3], 10, 0x8f0ccc92); /* 54 */ 168 | II(c, d, a, b, x[10], 15, 0xffeff47d); /* 55 */ 169 | II(b, c, d, a, x[ 1], 21, 0x85845dd1); /* 56 */ 170 | II(a, b, c, d, x[ 8], 6, 0x6fa87e4f); /* 57 */ 171 | II(d, a, b, c, x[15], 10, 0xfe2ce6e0); /* 58 */ 172 | II(c, d, a, b, x[ 6], 15, 0xa3014314); /* 59 */ 173 | II(b, c, d, a, x[13], 21, 0x4e0811a1); /* 60 */ 174 | II(a, b, c, d, x[ 4], 6, 0xf7537e82); /* 61 */ 175 | II(d, a, b, c, x[11], 10, 0xbd3af235); /* 62 */ 176 | II(c, d, a, b, x[ 2], 15, 0x2ad7d2bb); /* 63 */ 177 | II(b, c, d, a, x[ 9], 21, 0xeb86d391); /* 64 */ 178 | state[0] += a; 179 | state[1] += b; 180 | state[2] += c; 181 | state[3] += d; 182 | } 183 | 184 | -------------------------------------------------------------------------------- /md5.h: -------------------------------------------------------------------------------- 1 | #ifndef MD5_H 2 | #define MD5_H 3 | 4 | typedef struct 5 | { 6 | unsigned int count[2]; 7 | unsigned int state[4]; 8 | unsigned char buffer[64]; 9 | } MD5_CTX; 10 | 11 | 12 | #define F(x,y,z) ((x & y) | (~x & z)) 13 | #define G(x,y,z) ((x & z) | (y & ~z)) 14 | #define H(x,y,z) (x^y^z) 15 | #define I(x,y,z) (y ^ (x | ~z)) 16 | #define ROTATE_LEFT(x,n) ((x << n) | (x >> (32-n))) 17 | 18 | #define FF(a,b,c,d,x,s,ac) \ 19 | { \ 20 | a += F(b,c,d) + x + ac; \ 21 | a = ROTATE_LEFT(a,s); \ 22 | a += b; \ 23 | } 24 | #define GG(a,b,c,d,x,s,ac) \ 25 | { \ 26 | a += G(b,c,d) + x + ac; \ 27 | a = ROTATE_LEFT(a,s); \ 28 | a += b; \ 29 | } 30 | #define HH(a,b,c,d,x,s,ac) \ 31 | { \ 32 | a += H(b,c,d) + x + ac; \ 33 | a = ROTATE_LEFT(a,s); \ 34 | a += b; \ 35 | } 36 | #define II(a,b,c,d,x,s,ac) \ 37 | { \ 38 | a += I(b,c,d) + x + ac; \ 39 | a = ROTATE_LEFT(a,s); \ 40 | a += b; \ 41 | } 42 | void MD5Init(MD5_CTX *context); 43 | void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen); 44 | void MD5Final(MD5_CTX *context, unsigned char digest[16]); 45 | void MD5Transform(unsigned int state[4], unsigned char block[64]); 46 | void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len); 47 | void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len); 48 | 49 | #endif 50 | 51 | --------------------------------------------------------------------------------