C语言生成MD5校验码

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作者：super_bert@csdn

C语言生成MD5校验码源码，从Linux命令源码md5sum移植，MS Windows VS2010环境可用。

头文件md5.h

#ifndef MD5_H
#define MD5_H

#ifdef __alpha
typedef unsigned int uint32;
#else
typedef unsigned long uint32;
#endif

#define FOPRTXT "r"


struct MD5Context {
	uint32 buf[4];
	uint32 bits[2];
	unsigned char in[64];
};

void MD5Init(struct MD5Context *context);
void MD5Update(struct MD5Context *context, unsigned char const *buf, unsigned len);
void MD5Final(unsigned char digest[16], struct MD5Context *context);
void MD5Transform(uint32 buf[4], uint32 const in[16]);

/*
 * This is needed to make RSAREF happy on some MS-DOS compilers.
 */
typedef struct MD5Context MD5_CTX;


/*add by super bert 2014-09-29*/
//生成文件MD5
int mdfile(FILE *fp, unsigned char *digest);

int md5sum(const char *file, char *digest );

void print_digest(unsigned char *p, char *md5code);

#endif /* !MD5_H */

源文件md5.cpp

/*
 * This code implements the MD5 message-digest algorithm.
 * The algorithm is due to Ron Rivest.  This code was
 * written by Colin Plumb in 1993, no copyright is claimed.
 * This code is in the public domain; do with it what you wish.
 *
 * Equivalent code is available from RSA Data Security, Inc.
 * This code has been tested against that, and is equivalent,
 * except that you don't need to include two pages of legalese
 * with every copy.
 *
 * To compute the message digest of a chunk of bytes, declare an
 * MD5Context structure, pass it to MD5Init, call MD5Update as
 * needed on buffers full of bytes, and then call MD5Final, which
 * will fill a supplied 16-byte array with the digest.
 */

#include "stdafx.h"

#include <string.h>		/* for memcpy() */
#include "md5.h"

void byteReverse(unsigned char *buf, unsigned longs);

enum { UNKNOWN, MSB1st, LSB1st } byteOrder = UNKNOWN;

void setByteOrder(void) {
	union {
		unsigned short int usi;
		unsi