md5_ctx.h

一个MD5校验工具

// MD5_CTX.h: interface for the CMD5_CTX class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_MD5_CTX_H__87B27E9D_EF28_4708_82CC_A277F088B67E__INCLUDED_)
#define AFX_MD5_CTX_H__87B27E9D_EF28_4708_82CC_A277F088B67E__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#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

/* 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) + (unsigned long int)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
	(a) += G ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
	(a) += H ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
	(a) += I ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}

class CMD5_CTX  
{
public:
	CMD5_CTX();
	virtual ~CMD5_CTX();
	
	void MD5Update ( unsigned char *input, unsigned int inputLen);
	void MD5Final (unsigned char digest[16]);
	
	void MD5Print(unsigned char digest[16]);
	void MD5String( char *string, unsigned char result[16] );
	void MD5File( char *filename, unsigned char result[16] );
private:
	unsigned long int state[4];     /* state (ABCD) */
	unsigned long int count[2];     /* number of bits, modulo 2^64 (lsb first) */
	unsigned char buffer[64];       /* input buffer */
	unsigned char PADDING[64];  /* What? */
	
private:
	void MD5Init ();
	void MD5Transform (unsigned long int state[4], unsigned char block[64]);
	void MD5_memcpy (unsigned char* output, unsigned char* input,unsigned int len);
	void Encode (unsigned char *output, unsigned long int *input,unsigned int len);
	void Decode (unsigned long int *output, unsigned char *input, unsigned int len);
	void MD5_memset (unsigned char* output,int value,unsigned int len);
};

#endif // !defined(AFX_MD5_CTX_H__87B27E9D_EF28_4708_82CC_A277F088B67E__INCLUDED_)