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C语言 MD5源码
md5c.h:
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/* POINTER defines a generic pointer type */
typedefunsigned char* POINTER;
/* UINT2 defines a two byte word */
//typedef unsigned short int UINT2;
/* UINT4 defines a four byte word */
typedefunsigned longintUINT4;
/* MD5 context. */
typedefstruct{
UINT4 state[4]; /* state (ABCD) */
UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */
unsignedcharbuffer[64]; /* input buffer */
} MD5_CTX;
voidMD5Init (MD5_CTX *context);
voidMD5Update (MD5_CTX *context, unsigned char*input, unsigned intinputLen);
voidMD5UpdaterString(MD5_CTX *context,constchar*string);
int MD5FileUpdateFile (MD5_CTX *context,char*filename);
voidMD5Final (unsigned chardigest[16], MD5_CTX *context);
voidMDString (char*string,unsigned chardigest[16]);
int MD5File (char *filename,unsigned char digest[16]);
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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
staticvoidMD5_memcpy (POINTER output, POINTER input, unsignedintlen);
staticvoidMD5Transform (UINT4 state[4], unsignedcharblock[64]);
staticvoidEncode (unsignedchar*output, UINT4 *input, unsignedintlen);
staticvoidMD5_memset (POINTER output,intvalue, unsignedintlen);
staticvoidDecode (UINT4 *output, unsignedchar*input, unsignedintlen);
staticunsigned charPADDING[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.
*/
voidMD5Init (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.
*/
voidMD5Update (MD5_CTX *context, unsigned char*input, unsigned intinputLen)
{
unsignedinti, index, partLen;
/* Compute number of bytes mod 64 */
index = (unsignedint)((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.
*/
voidMD5Final (unsigned chardigest[16], MD5_CTX *context)
{
unsignedcharbits[8];
unsignedintindex, padLen;
/* Save number of bits */
Encode (bits, context->count, 8);
/* Pad out to 56 mod 64.
*/
index = (unsignedint)((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.
*/
staticvoidMD5Transform (UINT4 state[4], unsignedcharblock[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.
*/
staticvoidEncode (unsignedchar*output, UINT4 *input, unsignedintlen)
{
unsignedinti, j;
for(i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (unsignedchar)(input[i] & 0xff);
output[j+1] = (unsignedchar)((input[i] >> 8) & 0xff);
output[j+2] = (unsignedchar)((input[i] >> 16) & 0xff);
output[j+3] = (unsignedchar)((input[i] >> 24) & 0xff);
}
}
/* Decodes input (unsigned char) into output (UINT4). Assumes len is
a multiple of 4.
*/
staticvoidDecode (UINT4 *output, unsignedchar*input, unsignedintlen)
{
unsignedinti, 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.
*/
staticvoidMD5_memcpy (POINTER output, POINTER input, unsignedintlen)
{
unsignedinti;
for(i = 0; i < len; i++)
output[i] = input[i];
}
/* Note: Replace "for loop" with standard memset if possible.
*/
staticvoidMD5_memset (POINTER output,intvalue, unsignedintlen)
{
unsignedinti;
for(i = 0; i < len; i++)
((char*)output)[i] = (char)value;
}
/* Digests a string and prints the result.
*/
voidMDString (char*string,unsigned chardigest[16])
{
MD5_CTX context;
unsignedintlen = strlen(string);
MD5Init (&context);
MD5Update (&context, (unsignedchar*)string, len);
MD5Final (digest, &context);
}
/* Digests a file and prints the result.
*/
intMD5File (char*filename,unsigned chardigest[16])
{
FILE*file;
MD5_CTX context;
intlen;
unsignedcharbuffer[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);
}
return0;
}
voidMD5UpdaterString(MD5_CTX *context,constchar*string)
{
unsignedintlen = strlen(string);
MD5Update (context, (unsignedchar*)string, len);
}
intMD5FileUpdateFile (MD5_CTX *context,char*filename)
{
FILE*file;
intlen;
unsignedcharbuffer[1024];
if((file = fopen(filename, "rb")) == NULL)
return-1;
else{
while(len = fread(buffer, 1, 1024, file))
MD5Update (context, buffer, len);
fclose(file);
}
return0;
}
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用法:
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void main(void)
{
unsignedchardigest[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
}
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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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