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C语言MD5源码及实例[通俗易懂]

老牧童 • • C语言

C语言MD5源码及实例[通俗易懂]C语言MD5源码md5c.h:?123456789101112131415161718192021222324/*POINTERdefinesagenericpointertype*/ typedefunsignedcha

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C语言 MD5源码

md5c.h:


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/* POINTER defines a generic pointer type */ 
typedef
unsigned
char
* POINTER; 
   
/* UINT2 defines a two byte word */ 
//typedef unsigned short int UINT2; 
   
/* UINT4 defines a four byte word */ 
typedef
unsigned
long
int
UINT4; 
   
   
/* MD5 context. */ 
typedef
struct
{ 
 
UINT4 state[4];        
/* state (ABCD) */ 
 
UINT4 count[2]; 
/* number of bits, modulo 2^64 (lsb first) */ 
 
unsigned
char
buffer[64];      
/* input buffer */ 
} MD5_CTX; 
   
void
MD5Init (MD5_CTX *context); 
void
MD5Update (MD5_CTX *context, unsigned
char
*input, unsigned
int
inputLen); 
void
MD5UpdaterString(MD5_CTX *context,
const
char
*string); 
int
MD5FileUpdateFile (MD5_CTX *context,
char
*filename); 
void
MD5Final (unsigned
char
digest[16], MD5_CTX *context); 
void
MDString (
char
*string,unsigned
char
digest[16]); 
int
MD5File (
char
*filename,unsigned
char
digest[16]);

md5c.c:


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/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm 
 
*/ 
   
/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All 
rights reserved. 
   
License to copy and use this software is granted provided that it 
is identified as the "RSA Data Security, Inc. MD5 Message-Digest 
Algorithm" in all material mentioning or referencing this software 
or this function. 
   
License is also granted to make and use derivative works provided 
that such works are identified as "derived from the RSA Data 
Security, Inc. MD5 Message-Digest Algorithm" in all material 
mentioning or referencing the derived work. 
   
RSA Data Security, Inc. makes no representations concerning either 
the merchantability of this software or the suitability of this 
software for any particular purpose. It is provided "as is" 
without express or implied warranty of any kind. 
   
These notices must be retained in any copies of any part of this 
documentation and/or software. 
 
*/ 
#include "md5c.h" 
#include <string.h> 
#include <stdio.h> 
   
/* Constants for MD5Transform routine. 
*/ 
   
   
#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
MD5_memcpy (POINTER output, POINTER input, unsigned
int
len); 
static
void
MD5Transform (UINT4 state[4], unsigned
char
block[64]); 
static
void
Encode (unsigned
char
*output, UINT4 *input, unsigned
int
len); 
static
void
MD5_memset (POINTER output,
int
value, unsigned
int
len); 
static
void
Decode (UINT4 *output, unsigned
char
*input, unsigned
int
len); 
   
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 
}; 
   
/* F, G, H and I are basic MD5 functions. 
*/ 
#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))) 
   
/* ROTATE_LEFT rotates x left n bits. 
*/ 
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 
   
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 
Rotation is separate from addition to prevent recomputation. 
*/ 
#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); \ 
 
} 
   
/* MD5 initialization. Begins an MD5 operation, writing a new context. 
 
*/ 
void
MD5Init (MD5_CTX *context)         
/* context */ 
{ 
 
context->count[0] = context->count[1] = 0; 
 
/* Load magic initialization constants. 
 
*/ 
 
context->state[0] = 0x67452301; 
 
context->state[1] = 0xefcdab89; 
 
context->state[2] = 0x98badcfe; 
 
context->state[3] = 0x10325476; 
} 
   
/* MD5 block update operation. Continues an MD5 message-digest 
 
operation, processing another message block, and updating the 
 
context. 
 
*/ 
void
MD5Update (MD5_CTX *context, unsigned
char
*input, unsigned
int
inputLen) 
   
{ 
 
unsigned
int
i, index, partLen; 
   
 
/* Compute number of bytes mod 64 */ 
 
index = (unsigned
int
)((context->count[0] >> 3) & 0x3F); 
   
 
/* Update number of bits */ 
 
if
((context->count[0] += ((UINT4)inputLen << 3)) 
  
< ((UINT4)inputLen << 3)) 
  
context->count[1]++; 
 
context->count[1] += ((UINT4)inputLen >> 29); 
   
 
partLen = 64 - index; 
   
 
/* Transform as many times as possible. 
 
*/ 
 
if
(inputLen >= partLen) { 
  
MD5_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; 
   
 
/* Buffer remaining input */ 
 
MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],inputLen-i); 
} 
   
/* MD5 finalization. Ends an MD5 message-digest operation, writing the 
 
the message digest and zeroizing the context. 
 
*/ 
void
MD5Final (unsigned
char
digest[16], MD5_CTX *context)         
{ 
 
unsigned
char
bits[8]; 
 
unsigned
int
index, padLen; 
   
 
/* Save number of bits */ 
 
Encode (bits, context->count, 8); 
   
 
/* Pad out to 56 mod 64. 
 
*/ 
 
index = (unsigned
int
)((context->count[0] >> 3) & 0x3f); 
 
padLen = (index < 56) ? (56 - index) : (120 - index); 
 
MD5Update (context, PADDING, padLen); 
   
 
/* Append length (before padding) */ 
 
MD5Update (context, bits, 8); 
   
 
/* Store state in digest */ 
 
Encode (digest, context->state, 16); 
   
 
/* Zeroize sensitive information. 
 
*/ 
 
MD5_memset ((POINTER)context, 0,
sizeof
(*context)); 
} 
   
/* MD5 basic transformation. Transforms state based on block. 
 
*/ 
static
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); 
   
 
/* 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; 
   
 
/* Zeroize sensitive information. 
 
*/ 
 
MD5_memset ((POINTER)x, 0,
sizeof
(x)); 
} 
   
/* Encodes input (UINT4) into output (unsigned char). Assumes len is 
 
a multiple of 4. 
 
*/ 
static
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); 
 
} 
} 
   
/* Decodes input (unsigned char) into output (UINT4). Assumes len is 
 
a multiple of 4. 
 
*/ 
static
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); 
} 
   
/* Note: Replace "for loop" with standard memcpy if possible. 
 
*/ 
   
static
void
MD5_memcpy (POINTER output, POINTER input, unsigned
int
len) 
{ 
 
unsigned
int
i; 
   
 
for
(i = 0; i < len; i++) 
  
output[i] = input[i]; 
} 
   
/* Note: Replace "for loop" with standard memset if possible. 
 
*/ 
static
void
MD5_memset (POINTER output,
int
value, unsigned
int
len) 
{ 
 
unsigned
int
i; 
   
 
for
(i = 0; i < len; i++) 
  
((
char
*)output)[i] = (
char
)value; 
} 
/* Digests a string and prints the result. 
 
*/ 
void
MDString (
char
*string,unsigned
char
digest[16]) 
{ 
 
MD5_CTX context; 
 
unsigned
int
len =
strlen
(string); 
   
 
MD5Init (&context); 
 
MD5Update (&context, (unsigned
char
*)string, len); 
 
MD5Final (digest, &context); 
} 
/* Digests a file and prints the result. 
 
*/ 
int
MD5File (
char
*filename,unsigned
char
digest[16]) 
{ 
 
FILE
*file; 
 
MD5_CTX context; 
 
int
len; 
 
unsigned
char
buffer[1024]; 
   
 
if
((file =
fopen
(filename,
"rb"
)) == NULL) 
  
return
-1; 
 
else
{ 
  
MD5Init (&context); 
  
while
(len =
fread
(buffer, 1, 1024, file)) 
   
MD5Update (&context, buffer, len); 
  
MD5Final (digest, &context); 
   
  
fclose
(file); 
 
} 
 
return
0; 
} 
void
MD5UpdaterString(MD5_CTX *context,
const
char
*string) 
{ 
 
unsigned
int
len =
strlen
(string); 
 
MD5Update (context, (unsigned
char
*)string, len); 
} 
int
MD5FileUpdateFile (MD5_CTX *context,
char
*filename) 
{ 
 
FILE
*file; 
 
int
len; 
 
unsigned
char
buffer[1024]; 
   
 
if
((file =
fopen
(filename,
"rb"
)) == NULL) 
  
return
-1; 
 
else
{ 
  
while
(len =
fread
(buffer, 1, 1024, file)) 
   
MD5Update (context, buffer, len); 
  
fclose
(file); 
 
} 
 
return
0; 
}

用法:


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void
main(
void
) 
{ 
  
unsigned
char
digest[16];
//存放结果 
   
  
//第一种用法: 
   
  
MD5_CTX md5c; 
  
MD5Init(&md5c);
//初始化 
  
MD5UpdaterString(&md5c,
"你要测试的字符串"
); 
  
MD5FileUpdateFile(&md5c,
"你要测试的文件路径"
); 
  
MD5Final(digest,&md5c); 
   
  
//第二种用法: 
  
MDString(
"你要测试的字符串"
,digest);
//直接输入字符串并得出结果 
   
 
//第三种用法: 
 
MD5File(
"你要测试的文件路径"
,digest);
//直接输入文件路径并得出结果 
}

相关文章：

C++ MD5源码：http://www.jb51.net/article/103113.htm

C语言 MD5源码：http://www.jb51.net/article/103108.htm

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