md5.h

md5 加密的C/C++完美实现。 估计是现在最好的md5加密实现了

/*
 * md5.h
 *
 * header file for md5.cpp
 */
#ifndef _MD5_H_
#define _MD5_H_

#ifndef NULL
#define NULL 0
#endif //NULL

typedef unsigned char      BYTE;
typedef unsigned short int UINT2;
typedef unsigned long int  UINT4;

// MD5 context.
typedef struct _MD5_CTX {
	UINT4 state[4];    // state(ABCD)
	UINT4 count[2];    // number of bits, modulo 2^64) (lsb first)
	BYTE  buffer[64];  // input buffer
} MD5_CTX;

// MD5 initialization. Begins an MD5 operation, writing a new context.
// context: MD5_CTX.
void MD5Init(MD5_CTX* context);

// MD5 block update operation. Continues an MD5 message-digest operation,
// processing another message block, and updating the context.
// context:  MD5_CTX
// input:    input block
// inputLen: length of input block
void MD5Update(MD5_CTX* context, const BYTE* input, UINT4 inputLen);

// MD5 finalization. Ends an MD5 message-digest operation,
// writing the message digest and zeroizing the context.
// digest:  message digest.
// context: MD5_CTX.
void MD5Final(BYTE digest[16], MD5_CTX* context);

#endif //_MD5_H_