MD5算法MFC实现

MD5算法MFC实现

由 rfc1321 中实现的示范代码改写而来

/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. 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.
*/

 

// MD5Crypt.h: interface for the CMD5Crypt class.
// Author:WSAATool
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_MD5CRYPT_H__8D1E322D_1EF6_4954_A9CF_BAD85BDD1E90__INCLUDED_)
#define AFX_MD5CRYPT_H__8D1E322D_1EF6_4954_A9CF_BAD85BDD1E90__INCLUDED_

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

class CMD5Crypt 
{
private:
    /* MD5 context. */
    typedef struct {
        UINT  state[4];        /* state (ABCD) */
        UINT  count[2];        /* number of bits, modulo 2^64 (lsb first) */
        UCHAR buffer[64];      /* input buffer */
    } MD5_CTX;

    MD5_CTX *context; 

 

public:

    CMD5Crypt();

    virtual ~CMD5Crypt();

 

    //c风格接口,功能和rfc1321中原文的实现代码接口相同

    void Init(void);

    void Update(unsigned char *input, unsigned int inputLen);

    void Final(unsigned char digest[16]);

 

    //MFC风格接口,可以直接使用,不需要调用Init,Update和Final接口

    VOID GetMd5String(OUT CString &strMD5,IN char *input,IN int inputlen);

    VOID GetMd5String(OUT CString &strMD5,IN CString strInput);

private:
 VOID Encode(unsigned char *output,unsigned int *input,unsigned int len);
 VOID Decode(unsigned int *output,unsigned char *input,unsigned int len);
 VOID MD5Transform(unsigned int state[4],unsigned char block[64]);
};

#endif // !defined(AFX_MD5CRYPT_H__8D1E322D_1EF6_4954_A9CF_BAD85BDD1E90__INCLUDED_)

 

 

 

// MD5Crypt.cpp: implementation of the CMD5Crypt class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "MD5Crypt.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

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

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CMD5Crypt::CMD5Crypt()
{
    context=new MD5_CTX;
}

CMD5Crypt::~CMD5Crypt()
{
    if (context)
        delete context;
}

void CMD5Crypt::GetMd5String(CString &strMD5, char *input, int inputlen)
{
    unsigned char digest[16];
   
    Init();
    Update((unsigned char*)input,(unsigned int)inputlen);
    Final((unsigned char*)digest);
   
    CString strTemp;
    for(int i=0;i<16;i++)
    {
        strTemp.Format("%02x",digest[i]);
        strMD5+=strTemp;
    }
}

VOID CMD5Crypt::GetMd5String(CString &strMD5, CString strInput)
{
    int len;
    len=strInput.GetLength();
    GetMd5String(strMD5,strInput.GetBuffer(len),len);
}

VOID CMD5Crypt::Init()
{
    context->count[0] = context->count[1] = 0;
    /* Load magic initialization constants.
    */
    context->state[0] = 0x67452301;
    context->state[1] = 0xefcdab89;
    context->state[2] = 0x98badcfe;
    context->state[3] = 0x10325476;
}

VOID CMD5Crypt::Update(unsigned char *input, unsigned int inputLen)
{
    unsigned int i, index, partLen;
   
    /* Compute number of bytes mod 64 */
    index = (unsigned int)((context->count[0] >> 3) & 0x3F);
   
    /* Update number of bits */
    if ((context->count[0] += ((UINT)inputLen << 3))
        < ((UINT)inputLen << 3))
        context->count[1]++;
    context->count[1] += ((UINT)inputLen >> 29);
   
    partLen = 64 - index;
   
    /* Transform as many times as possible. */
    if (inputLen >= partLen) {
        memcpy(&context->buffer[index], input, partLen);
        MD5Transform (context->state, context->buffer);
       
        for (i = partLen; i + 63 < inputLen; i += 64)
            MD5Transform (context->state, &input[i]);
       
        index = 0;
    }
    else
        i = 0;
   
    /* Buffer remaining input */
    memcpy(&context->buffer[index], &input[i],inputLen-i);
}

VOID CMD5Crypt::Final(UCHAR digest[16])
{
    static unsigned char PADDING[64] = {
        0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
    };

    unsigned char bits[8];
    unsigned int index, padLen;
   
    /* Save number of bits */
    Encode (bits, context->count, 8);
   
    /* Pad out to 56 mod 64.
    */
    index = (unsigned int)((context->count[0] >> 3) & 0x3f);
    padLen = (index < 56) ? (56 - index) : (120 - index);
    Update ( PADDING, padLen);
   
    /* Append length (before padding) */
    Update (bits, 8);
    /* Store state in digest */
    Encode (digest, context->state, 16);
   
    /* Zeroize sensitive information.
    */
    memset (context, 0, sizeof (*context));

}

//////////////////////////////////////////////////////////////////////////
//private:
VOID CMD5Crypt::MD5Transform(UINT state[4],UCHAR block[64])
{
    UINT a = state[0], b = state[1], c = state[2], d = state[3], x[16];
   
    Decode (x, block, 64);
   
    /* Round 1 */
    FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
    FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
    FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
    FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
    FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
    FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
    FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
    FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
    FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
    FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
    FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
    FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
    FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
    FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
    FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
    FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
   
    /* Round 2 */
    GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
    GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
    GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
    GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
    GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
    GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
    GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
    GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
    GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
    GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
    GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
   
    GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
    GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
    GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
    GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
    GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
   
    /* Round 3 */
    HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
    HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
    HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
    HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
    HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
    HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
    HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
    HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
    HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
    HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
    HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
    HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
    HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
    HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
    HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
    HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
   
    /* Round 4 */
    II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
    II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
    II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
    II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
    II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
    II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
    II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
    II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
    II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
    II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
    II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
    II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
    II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
    II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
    II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
    II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
   
    state[0] += a;
    state[1] += b;
    state[2] += c;
    state[3] += d;
   
    /* Zeroize sensitive information.
    */
    memset (x, 0, sizeof (x));
}

VOID CMD5Crypt::Encode(UCHAR *output,UINT *input,UINT len)
{
    unsigned int i, j;
   
    for (i = 0, j = 0; j < len; i++, j += 4) {
        output[j] = (unsigned char)(input[i] & 0xff);
        output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
        output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
        output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
    }
}

VOID CMD5Crypt::Decode(UINT *output,UCHAR *input,UINT len)
{
    unsigned int i, j;
   
    for (i = 0, j = 0; j < len; i++, j += 4)
        output[i] = ((UINT)input[j]) | (((UINT)input[j+1]) << 8) |
        (((UINT)input[j+2]) << 16) | (((UINT)input[j+3]) << 24);
}