?? md5driver.c
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#include <stdio.h>#include <sys/types.h>#include <time.h>#include <string.h>/* typedef a 32 bit type */typedef unsigned long int UINT4;/* Data structure for MD5 (Message Digest) computation */typedef struct { UINT4 i[2]; /* number of _bits_ handled mod 2^64 */ UINT4 buf[4]; /* scratch buffer */ unsigned char in[64]; /* input buffer */ unsigned char digest[16]; /* actual digest after MD5Final call */} MD5_CTX;//void MD5Init(MD5_CTX *mdContext);//void MD5Final (MD5_CTX *mdContext);//void MD5Final (MD5_CTX *mdContext);/* ********************************************************************** ** End of md5.h ** ******************************* (cut) ******************************** ********************************************************************** ** md5.c ** ** RSA Data Security, Inc. MD5 Message Digest Algorithm ** ** Created: 2/17/90 RLR ** ** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version ** ********************************************************************** *//* ********************************************************************** ** Copyright (C) 1990, RSA Data Security, Inc. 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. ** ********************************************************************** *//* forward declaration */static void Transform (UINT4 *buf,UINT4 *in);static unsigned char PADDING[64] = { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};/* F, G and H are basic MD5 functions: selection, majority, parity */#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); \ }void MD5Init (MD5_CTX *mdContext){ mdContext->i[0] = mdContext->i[1] = (UINT4)0; /* Load magic initialization constants. */ mdContext->buf[0] = (UINT4)0x67452301; mdContext->buf[1] = (UINT4)0xefcdab89; mdContext->buf[2] = (UINT4)0x98badcfe; mdContext->buf[3] = (UINT4)0x10325476;}void MD5Update (MD5_CTX *mdContext,unsigned char *inBuf,unsigned int inLen){ UINT4 in[16]; int mdi; unsigned int i, ii; /* compute number of bytes mod 64 */ mdi = (int)((mdContext->i[0] >> 3) & 0x3F); /* update number of bits */ if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0]) mdContext->i[1]++; mdContext->i[0] += ((UINT4)inLen << 3); mdContext->i[1] += ((UINT4)inLen >> 29); while (inLen--) { /* add new character to buffer, increment mdi */ mdContext->in[mdi++] = *inBuf++; /* transform if necessary */ if (mdi == 0x40) { for (i = 0, ii = 0; i < 16; i++, ii += 4) in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | (((UINT4)mdContext->in[ii+2]) << 16) | (((UINT4)mdContext->in[ii+1]) << 8) | ((UINT4)mdContext->in[ii]); Transform (mdContext->buf, in); mdi = 0; } }}void MD5Final (MD5_CTX *mdContext){ UINT4 in[16]; int mdi; unsigned int i, ii; unsigned int padLen; /* save number of bits */ in[14] = mdContext->i[0]; in[15] = mdContext->i[1]; /* compute number of bytes mod 64 */ mdi = (int)((mdContext->i[0] >> 3) & 0x3F); /* pad out to 56 mod 64 */ padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi); MD5Update (mdContext, PADDING, padLen); /* append length in bits and transform */ for (i = 0, ii = 0; i < 14; i++, ii += 4) in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | (((UINT4)mdContext->in[ii+2]) << 16) | (((UINT4)mdContext->in[ii+1]) << 8) | ((UINT4)mdContext->in[ii]); Transform (mdContext->buf, in); /* store buffer in digest */ for (i = 0, ii = 0; i < 4; i++, ii += 4) { mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF); mdContext->digest[ii+1] = (unsigned char)((mdContext->buf[i] >> 8) & 0xFF); mdContext->digest[ii+2] = (unsigned char)((mdContext->buf[i] >> 16) & 0xFF); mdContext->digest[ii+3] = (unsigned char)((mdContext->buf[i] >> 24) & 0xFF); }}/* Basic MD5 step. Transform buf based on in. */static void Transform (UINT4 *buf,UINT4 *in){ UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3]; /* Round 1 */#define S11 7#define S12 12#define S13 17#define S14 22 //FF ( a, b, c, d, in[ 0], S11, 3614090360); /* 1 */ FF ( a, b, c, d, in[ 0], S11, 0xd76aa478); /* 1 */ FF ( d, a, b, c, in[ 1], S12, 0xe8c7b756); /* 2 */ FF ( c, d, a, b, in[ 2], S13, 0x242070db); /* 3 */ FF ( b, c, d, a, in[ 3], S14, 0xc1bdceee); /* 4 */ FF ( a, b, c, d, in[ 4], S11, 0xf57c0faf); /* 5 */ FF ( d, a, b, c, in[ 5], S12, 0x4787c62a); /* 6 */ FF ( c, d, a, b, in[ 6], S13, 0xa8304613); /* 7 */ FF ( b, c, d, a, in[ 7], S14, 0xfd469501); /* 8 */ FF ( a, b, c, d, in[ 8], S11, 0x698098d8); /* 9 */ FF ( d, a, b, c, in[ 9], S12, 0x8b44f7af); /* 10 */ FF ( c, d, a, b, in[10], S13, 0xffff5bb1); /* 11 */ FF ( b, c, d, a, in[11], S14, 0x895cd7be); /* 12 */ FF ( a, b, c, d, in[12], S11, 0x6b901122); /* 13 */ FF ( d, a, b, c, in[13], S12, 0xfd987193); /* 14 */ FF ( c, d, a, b, in[14], S13, 0xa679438e); /* 15 */ FF ( b, c, d, a, in[15], S14, 0x49b40821); /* 16 */ /* Round 2 */#define S21 5#define S22 9#define S23 14#define S24 20 GG ( a, b, c, d, in[ 1], S21, 0xf61e2562); /* 17 */ GG ( d, a, b, c, in[ 6], S22, 0xc040b340); /* 18 */ GG ( c, d, a, b, in[11], S23, 0x265e5a51); /* 19 */ GG ( b, c, d, a, in[ 0], S24, 0xe9b6c7aa); /* 20 */ GG ( a, b, c, d, in[ 5], S21, 0xd62f105d); /* 21 */ GG ( d, a, b, c, in[10], S22, 0x2441453); /* 22 */ GG ( c, d, a, b, in[15], S23, 0xd8a1e681); /* 23 */ GG ( b, c, d, a, in[ 4], S24, 0xe7d3fbc8); /* 24 */ GG ( a, b, c, d, in[ 9], S21, 0x21e1cde6); /* 25 */ GG ( d, a, b, c, in[14], S22, 0xc33707d6); /* 26 */?? 快捷鍵說明
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