_md5.cpp

MD5的加密解密在C++buidler中的使用

//---------------------------------------------------------------------------


#pragma hdrstop

#include "_MD5.h"

#include "mem.h"
#include "string.h"
#include "Classes.hpp"

#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 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 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 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 int)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
//---------------------------------------------------------------------------

#pragma package(smart_init)
unsigned char MD5Coder::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
};

/* Encodes input (unsigned int) into output (unsigned char). Assumes len is
  a multiple of 4.
 */
void MD5Coder::Encode(unsigned char *output,unsigned int *input,unsigned int len)
{
        //TODO: Add your source code here
        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);
        }
}

/* Decodes input (unsigned char) into output (unsigned int). Assumes len is
  a multiple of 4.
 */
void MD5Coder::Decode(unsigned int * output, unsigned char * input, unsigned int len)
{
        //TODO: Add your source code here
        unsigned int i, j;

        for (i = 0, j = 0; j < len; i++, j += 4)
                output[i] = ((unsigned int)input[j]) | (((unsigned int)input[j+1]) << 8) |
                                (((unsigned int)input[j+2]) << 16) | (((unsigned int)input[j+3]) << 24);
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
 */
void MD5Coder::MD5Init(MD5_CTX * context)
{
        //TODO: Add your source code here
        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;
}

/* MD5 block update operation. Continues an MD5 message-digest
  operation, processing another message block, and updating the
  context.
 */
void MD5Coder::MD5Update(MD5_CTX * context, unsigned char * input, unsigned int inputLen)
{
        //TODO: Add your source code here
        unsigned int i, index, partLen;
        /* Compute number of bytes mod 64 */
        index = ((context->count[0] >> 3) & 0x3F);

        /* Update number of bits */
        if ((context->count[0] += (inputLen << 3)) < (inputLen << 3))
                context->count[1]++;
        context->count[1] += (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);
}

/* MD5 finalization. Ends an MD5 message-digest operation, writing the
  the message digest and zeroizing the context.
 */
void MD5Coder::MD5Final(unsigned char digest[16], MD5_CTX * context)
{
        //TODO: Add your source code here
        unsigned char bits[8];
        unsigned int index, padLen;

        /* Save number of bits */
        Encode (bits, context->count, 8);

        /* Pad out to 56 mod 64.
        */
        index = ((context->count[0] >> 3) & 0x3f);
        padLen = (index < 56) ? (56 - index) : (120 - index);
        MD5Update (context, PADDING, padLen);

        /* Append length (before padding) */
        MD5Update (context, bits, 8);

        /* Store state in digest */
        Encode (digest, context->state, 16);

        /* Zeroize sensitive information.
        */
        memset (context, 0, sizeof (*context));
}

/* MD5 basic transformation. Transforms state based on block.
 */
void MD5Coder::MD5Transform(unsigned int state[4], unsigned char block[64])
{
        //TODO: Add your source code here
        unsigned int 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));
}

AnsiString MD5Coder::MD5String(char *in)
{
        //TODO: Add your source code here
        unsigned int len = strlen(in);

        MD5_CTX context;
        unsigned char digest[16];
        unsigned char out[33];
        AnsiString rtn;

        MD5Init(&context);
        MD5Update(&context,(unsigned char *)in, len);
        MD5Final((unsigned char *)digest, &context);

        BinToHex(digest,out,32);
        out[32] = '\0';
        rtn.printf(out);
        return rtn;
}

void MD5Coder::MD5Buff(char *in,int length,char *out)//outΪchar[16]
{
        unsigned int len = length;

        MD5_CTX context;

        MD5Init(&context);
        MD5Update(&context,(unsigned char *)in, len);
        MD5Final((unsigned char *)out, &context);
}

AnsiString MD5Coder::MD5File(AnsiString filename)
{
        //TODO: Add your source code here
        TFileStream * fs = new TFileStream(filename,fmOpenRead);
        MD5_CTX context;
        int len;
        unsigned char buffer[40960], digest[16],out[33];
        AnsiString rtn;

        MD5Init (&context);
        while((len = fs->Read(buffer,40960)) != 0)
                MD5Update (&context, buffer, len);
        MD5Final (digest, &context);

        delete fs;

        BinToHex(digest,out,32);
        out[32] = '\0';
        rtn.printf(out);
        return rtn;
}