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2021/12/25
[C/C++ 演算法]-純C 檔案MD5計算
資料來源:http://people.csail.mit.edu/rivest/Md5.c
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#ifndef MD5_H_INCLUDED #define MD5_H_INCLUDED /* ********************************************************************** ** md5.h — Header file for implementation of MD5 ** ** RSA Data Security, Inc. MD5 Message Digest Algorithm ** ** Created: 2/17/90 RLR ** ** Revised: 12/27/90 SRD,AJ,BSK,JT Reference C version ** ** Revised (for MD5): RLR 4/27/91 ** ** — G modified to have y&~z instead of y&z ** ** — FF, GG, HH modified to add in last register done ** ** — Access pattern: round 2 works mod 5, round 3 works mod 3 ** ** — distinct additive constant for each step ** ** — round 4 added, working mod 7 ** ********************************************************************** */
/* ********************************************************************** ** 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. ** ********************************************************************** */
/* typedef a 32 bit type */ typedefunsignedlongint UINT4;
/* Data structure for MD5 (Message Digest) computation */ typedefstruct{ UINT4 i[2]; /* number of _bits_ handled mod 2^64 */ UINT4 buf[4]; /* scratch buffer */ unsignedchar in[64]; /* input buffer */ unsignedchar digest[16]; /* actual digest after MD5Final call */ } MD5_CTX;
void MD5Init (); void MD5Update (); void MD5Final ();
#endif // MD5_H_INCLUDED
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/* ********************************************************************** ** 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. ** ********************************************************************** */
/* — include the following line if the md5.h header file is separate — */ /* #include “md5.h” */
/* forward declaration */ #include “md5.h“ staticvoid Transform ();
staticunsignedchar 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 (mdContext) 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 (mdContext, inBuf, inLen) MD5_CTX *mdContext; unsignedchar*inBuf; unsignedint inLen; { UINT4 in[16]; int mdi; unsignedint 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 (mdContext) MD5_CTX *mdContext; { UINT4 in[16]; int mdi; unsignedint i, ii; unsignedint 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]=(unsignedchar)(mdContext->buf[i]&0xFF); mdContext->digest[ii+1]= (unsignedchar)((mdContext->buf[i]>>8)&0xFF); mdContext->digest[ii+2]= (unsignedchar)((mdContext->buf[i]>>16)&0xFF); mdContext->digest[ii+3]= (unsignedchar)((mdContext->buf[i]>>24)&0xFF); } }
/* Basic MD5 step. Transform buf based on in. */ staticvoid Transform (buf, in) 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 ( d, a, b, c, in[1], S12,3905402710);/* 2 */ FF ( c, d, a, b, in[2], S13, 606105819);/* 3 */ FF ( b, c, d, a, in[3], S14,3250441966);/* 4 */ FF ( a, b, c, d, in[4], S11,4118548399);/* 5 */ FF ( d, a, b, c, in[5], S12,1200080426);/* 6 */ FF ( c, d, a, b, in[6], S13,2821735955);/* 7 */ FF ( b, c, d, a, in[7], S14,4249261313);/* 8 */ FF ( a, b, c, d, in[8], S11,1770035416);/* 9 */ FF ( d, a, b, c, in[9], S12,2336552879);/* 10 */ FF ( c, d, a, b, in[10], S13,4294925233);/* 11 */ FF ( b, c, d, a, in[11], S14,2304563134);/* 12 */ FF ( a, b, c, d, in[12], S11,1804603682);/* 13 */ FF ( d, a, b, c, in[13], S12,4254626195);/* 14 */ FF ( c, d, a, b, in[14], S13,2792965006);/* 15 */ FF ( b, c, d, a, in[15], S14,1236535329);/* 16 */
/* Round 2 */ #define S21 5 #define S22 9 #define S23 14 #define S24 20 GG ( a, b, c, d, in[1], S21,4129170786);/* 17 */ GG ( d, a, b, c, in[6], S22,3225465664);/* 18 */ GG ( c, d, a, b, in[11], S23, 643717713);/* 19 */ GG ( b, c, d, a, in[0], S24,3921069994);/* 20 */ GG ( a, b, c, d, in[5], S21,3593408605);/* 21 */ GG ( d, a, b, c, in[10], S22, 38016083);/* 22 */ GG ( c, d, a, b, in[15], S23,3634488961);/* 23 */ GG ( b, c, d, a, in[4], S24,3889429448);/* 24 */ GG ( a, b, c, d, in[9], S21, 568446438);/* 25 */ GG ( d, a, b, c, in[14], S22,3275163606);/* 26 */ GG ( c, d, a, b, in[3], S23,4107603335);/* 27 */ GG ( b, c, d, a, in[8], S24,1163531501);/* 28 */ GG ( a, b, c, d, in[13], S21,2850285829);/* 29 */ GG ( d, a, b, c, in[2], S22,4243563512);/* 30 */ GG ( c, d, a, b, in[7], S23,1735328473);/* 31 */ GG ( b, c, d, a, in[12], S24,2368359562);/* 32 */
/* Round 3 */ #define S31 4 #define S32 11 #define S33 16 #define S34 23 HH ( a, b, c, d, in[5], S31,4294588738);/* 33 */ HH ( d, a, b, c, in[8], S32,2272392833);/* 34 */ HH ( c, d, a, b, in[11], S33,1839030562);/* 35 */ HH ( b, c, d, a, in[14], S34,4259657740);/* 36 */ HH ( a, b, c, d, in[1], S31,2763975236);/* 37 */ HH ( d, a, b, c, in[4], S32,1272893353);/* 38 */ HH ( c, d, a, b, in[7], S33,4139469664);/* 39 */ HH ( b, c, d, a, in[10], S34,3200236656);/* 40 */ HH ( a, b, c, d, in[13], S31, 681279174);/* 41 */ HH ( d, a, b, c, in[0], S32,3936430074);/* 42 */ HH ( c, d, a, b, in[3], S33,3572445317);/* 43 */ HH ( b, c, d, a, in[6], S34, 76029189);/* 44 */ HH ( a, b, c, d, in[9], S31,3654602809);/* 45 */ HH ( d, a, b, c, in[12], S32,3873151461);/* 46 */ HH ( c, d, a, b, in[15], S33, 530742520);/* 47 */ HH ( b, c, d, a, in[2], S34,3299628645);/* 48 */
/* Round 4 */ #define S41 6 #define S42 10 #define S43 15 #define S44 21 II ( a, b, c, d, in[0], S41,4096336452);/* 49 */ II ( d, a, b, c, in[7], S42,1126891415);/* 50 */ II ( c, d, a, b, in[14], S43,2878612391);/* 51 */ II ( b, c, d, a, in[5], S44,4237533241);/* 52 */ II ( a, b, c, d, in[12], S41,1700485571);/* 53 */ II ( d, a, b, c, in[3], S42,2399980690);/* 54 */ II ( c, d, a, b, in[10], S43,4293915773);/* 55 */ II ( b, c, d, a, in[1], S44,2240044497);/* 56 */ II ( a, b, c, d, in[8], S41,1873313359);/* 57 */ II ( d, a, b, c, in[15], S42,4264355552);/* 58 */ II ( c, d, a, b, in[6], S43,2734768916);/* 59 */ II ( b, c, d, a, in[13], S44,1309151649);/* 60 */ II ( a, b, c, d, in[4], S41,4149444226);/* 61 */ II ( d, a, b, c, in[11], S42,3174756917);/* 62 */ II ( c, d, a, b, in[2], S43, 718787259);/* 63 */ II ( b, c, d, a, in[9], S44,3951481745);/* 64 */
buf[0]+= a; buf[1]+= b; buf[2]+= c; buf[3]+= d; }
/* ********************************************************************** ** End of md5.c ** ******************************* (cut) ******************************** */
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#include <stdio.h> #include <sys/types.h> #include <time.h> #include <string.h> #include "md5.h" //資料來源:http://people.csail.mit.edu/rivest/Md5.c
/* Prints message digest buffer in mdContext as 32 hexadecimal digits.
Order is from low-order byte to high-order byte of digest.
Each byte is printed with high-order hexadecimal digit first.
*/
staticvoid MDPrint (MD5_CTX *mdContext) {
int i;
for(i =0; i <16; i++) printf("x", mdContext->digest[i]); }
/* size of test block */
#define TEST_BLOCK_SIZE 1000
/* number of blocks to process */
#define TEST_BLOCKS 10000
/* number of test bytes = TEST_BLOCK_SIZE * TEST_BLOCKS */
staticlong TEST_BYTES =(long)TEST_BLOCK_SIZE *(long)TEST_BLOCKS;
/* A time trial routine, to measure the speed of MD5.
Measures wall time required to digest TEST_BLOCKS * TEST_BLOCK_SIZE
characters.
*/
staticvoid MDTimeTrial () {
MD5_CTX mdContext; time_t endTime, startTime; unsignedchar data[TEST_BLOCK_SIZE]; unsignedint i;
/* initialize test data */ for(i =0; i < TEST_BLOCK_SIZE; i++) data[i]=(unsignedchar)(i &0xFF);
/* start timer */ printf("MD5 time trial. Processing %ld characters...\n", TEST_BYTES); time(&startTime);
/* digest data in TEST_BLOCK_SIZE byte blocks */ MD5Init (&mdContext); for(i = TEST_BLOCKS; i >0; i--) MD5Update (&mdContext, data, TEST_BLOCK_SIZE); MD5Final (&mdContext);
/* stop timer, get time difference */ time(&endTime); MDPrint (&mdContext); printf(" is digest of test input.\n"); printf ("Seconds to process test input: %ld\n",(long)(endTime-startTime)); printf ("Characters processed per second: %ld\n", TEST_BYTES/(endTime-startTime)); }
/* Computes the message digest for string inString.
Prints out message digest, a space, the string (in quotes) and a
carriage return.
*/
staticvoid MDString (char*inString) {
MD5_CTX mdContext; unsignedint len =strlen(inString);
MD5Init (&mdContext); MD5Update (&mdContext, inString, len); MD5Final (&mdContext); MDPrint (&mdContext); printf("\"%s\"\n\n", inString); }
/* Computes the message digest for a specified file.
Prints out message digest, a space, the file name, and a carriage
return.
*/
staticvoid MDFile (char*filename)
{
FILE*inFile =fopen(filename,"rb"); MD5_CTX mdContext; int bytes; unsignedchar data[1024];
if(inFile ==NULL){ printf("%s can't be opened.\n", filename); return; }
MD5Init (&mdContext); while((bytes =fread(data,1,1024, inFile))!=0) MD5Update (&mdContext, data, bytes); MD5Final (&mdContext); MDPrint (&mdContext); printf("%s\n", filename); fclose(inFile); }
/* Writes the message digest of the data from stdin onto stdout,
followed by a carriage return.
*/
staticvoid MDFilter () {
MD5_CTX mdContext; int bytes; unsignedchar data[16];
MD5Init (&mdContext); while((bytes =fread(data,1,16,stdin))!=0) MD5Update (&mdContext, data, bytes); MD5Final (&mdContext); MDPrint (&mdContext); printf("\n"); }
/* Runs a standard suite of test data.
*/
staticvoid MDTestSuite () {
printf("MD5 test suite results:\n\n"); MDString (""); MDString ("a"); MDString ("abc"); MDString ("message digest"); MDString ("abcdefghijklmnopqrstuvwxyz"); MDString
("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"); MDString
("1234567890123456789012345678901234567890\ 1234567890123456789012345678901234567890"); /* Contents of file foo are "abc" */ MDFile ("foo"); }
intmain(int argc,char*argv[]) {
int i;
/* For each command line argument in turn: ** filename -- prints message digest and name of file
** -sstring -- prints message digest and contents of string
** -t -- prints time trial statistics for 1M characters
** -x -- execute a standard suite of test data
** (no args) -- writes messages digest of stdin onto stdout
*/
/* //原始寫法 if (argc == 1)
MDFilter ();
else
for (i = 1; i < argc; i++)
if (argv[i][0] == '-' && argv[i][1] == 's')
MDString (argv[i] + 2);
else if (strcmp (argv[i], "-t") == 0)
MDTimeTrial ();
else if (strcmp (argv[i], "-x") == 0)
MDTestSuite ();
else MDFile (argv[i]);
*/
MDFile (argv[1]);//JASH modify return0; }
/*
**********************************************************************
** End of md5driver.c **
******************************* (cut) ********************************
*/
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