xmd5.cpp

BCB的学习资料

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


#pragma hdrstop

#include "XMD5.h"

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

#pragma package(smart_init)
namespace zdhsoft
{
#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

XDWord XMD5::F(XDWord X, XDWord Y, XDWord Z)
{
    return (X&Y)|((~X)&Z);
}
XDWord XMD5::G(XDWord X, XDWord Y, XDWord Z)
{
    return (X&Z)|(Y&(~Z));
}
XDWord XMD5::H(XDWord X, XDWord Y, XDWord Z)
{
    return X^Y^Z;
}
XDWord XMD5::I(XDWord X, XDWord Y, XDWord Z)
{
    return Y^(X|(~Z));
}

XDWord XMD5::ROTATE_LEFT(XDWord X,XDWord N)
{
    return (X<<N)|(X>>(32-N));
}


XDWord XMD5::FF(XDWord A,XDWord B,XDWord C,XDWord D,XDWord X,XDWord L,XDWord AC)
{
    A+=F(B,C,D)+X+AC;
    A=ROTATE_LEFT(A,L);
    return A+B;
}
XDWord XMD5::GG(XDWord A,XDWord B,XDWord C,XDWord D,XDWord X,XDWord L,XDWord AC)
{
    A+=G(B,C,D)+X+AC;
    A=ROTATE_LEFT(A,L);
    return A+B;
}
XDWord XMD5::HH(XDWord A,XDWord B,XDWord C,XDWord D,XDWord X,XDWord L,XDWord AC)
{
    A+=H(B,C,D)+X+AC;
    A=ROTATE_LEFT(A,L);
    return A+B;
}
XDWord XMD5::II(XDWord A,XDWord B,XDWord C,XDWord D,XDWord X,XDWord L,XDWord AC)
{
    A+=I(B,C,D)+X+AC;
    A=ROTATE_LEFT(A,L);
    return A+B;
}
void XMD5::MD5Init()
{
    FContext.count[0]=0;
    FContext.count[1]=0;
    FContext.state[0]=0x67452301L;
    FContext.state[1]=0xefcdab89L;
    FContext.state[2]=0x98badcfeL;
    FContext.state[3]=0x10325476L;
}
void XMD5::MD5Update(XByte * lpInput,XDWord dwLength)
{
    XDWord i, index, partLen;
    index = (FContext.count[0] >> 3) & 0x3F;

    XDWord tmp1,tmp2;

    tmp1=dwLength<<3;
    tmp2=tmp1+FContext.count[0];
    FContext.count[0]=tmp2;
    if(tmp2<tmp1)
    {
        FContext.count[1]++;
    }
    FContext.count[1]+=dwLength>>29;
    partLen = 64 - index;

    if(dwLength>=partLen)
    {
        MD5MemCpy(&FContext.buff[index],lpInput,partLen);
        MD5Transform(FContext.buff);
        for(i=partLen;i+63<dwLength;i+=64)
        {
            MD5Transform(&lpInput[i]);
        }
        index=0;
    }
    else
    {
        i=0;
    }
    MD5MemCpy(&FContext.buff[index],&lpInput[i],dwLength-i);
}
void XMD5::MD5MemSet(XByte * lpOutput, XByte btValue, XDWord dwLength)
{
    for(XDWord i=0;i<dwLength;i++)
    {
        *lpOutput=btValue;
        lpOutput++;
    }
}
void XMD5::MD5MemCpy(XByte * lpOutput, XByte * lpInput, XDWord dwLength)
{
    for(XDWord i=0;i<dwLength;i++)
    {
        *lpOutput=*lpInput;
        lpOutput++;
        lpInput++;
    }
}
void XMD5::MD5Transform (XByte *lpInput)
{
  //UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
  XDWord a,b,c,d,x[16];
  a=FContext.state[0];
  b=FContext.state[1];
  c=FContext.state[2];
  d=FContext.state[3];
  Decode (x, lpInput, 64);

  /* Round 1 */
  a = FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
  d = FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
  c = FF(c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
  b = FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
  a = FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
  d = FF(d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
  c = FF(c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
  b = FF(b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
  a = FF(a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
  d = FF(d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
  c = FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  b = FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  a = FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  d = FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  c = FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  b = FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

 /* Round 2 */
  a = GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
  d = GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
  c = GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  b = GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
  a = GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
  d = GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
  c = GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  b = GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
  a = GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
  d = GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  c = GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
  b = GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
  a = GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  d = GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
  c = GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
  b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

  /* Round 3 */
  a = HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
  d = HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
  c = HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  b = HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  a = HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
  d = HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
  c = HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
  b = HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  a = HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  d = HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
  c = HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
  b = HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
  a = HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
  d = HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  b = HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

  /* Round 4 */
  a = II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
  d = II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
  c = II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  b = II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */

  a = II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  d = II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
  c = II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  b = II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */

  a = II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
  d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  c = II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
  b = II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */

  a = II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
  d = II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  c = II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
  b = II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

  FContext.state[0]+=a;
  FContext.state[1]+=b;
  FContext.state[2]+=c;
  FContext.state[3]+=d;

}
void XMD5::Encode(XByte *lpOutput,XDWord *lpInput,XDWord dwLength)
{
    XDWord j, tmp;
    for(j=0;j<dwLength;j+=4)
    {
        tmp=*lpInput++;
        *lpOutput++=(XByte)(tmp&0xff);
        tmp=tmp>>8;
        *lpOutput++=(XByte)(tmp&0xff);
        tmp=tmp>>8;
        *lpOutput++=(XByte)(tmp&0xff);
        tmp=tmp>>8;
        *lpOutput++=(XByte)(tmp&0xff);
    }
}

void XMD5::Decode(XDWord *lpOutput,XByte *lpInput,XDWord dwLength)
{
    XDWord j;
    for(j=0; j<dwLength; j+=4)
    {
        *lpOutput=(XDWord)(*lpInput++);
        *lpOutput|=(((XDWord)(*lpInput++))<<8);
        *lpOutput|=(((XDWord)(*lpInput++))<<16);
        *lpOutput|=(((XDWord)(*lpInput++))<<24);
        lpOutput++;
    }
}
void XMD5::MD5Final()
{
    XByte 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
    };
    XByte bits[8];
    XDWord index,padLen;
    Encode(bits,FContext.count,8);
    index=(FContext.count[0]>>3)&0x3f;
    padLen = (index < 56) ? (56 - index) : (120 - index);
    MD5Update(PADDING,padLen);
    MD5Update(bits,8);
}
/*
    Name: XMD5::GetMD5Str
    Description: 取得某一个串的MD5编码
    Version 1.0
    Date 2003-11-18
    Author: zdhosft
    Param:
        <in> lpInput<char *>输入的串 [串的内容不会被改变]
        <in> iInputLen<int> 输入的串的长度。
        <out> lpOutput<char *>生成编码存放的地方，因为编码要有32个字符，
                              再加上一个串结束符，所以需要至少33个字符。
    Return
        <char *>返回lpOutput的地址。
*/
char * XMD5::GetMD5OfStr(char * lpInput,int iInputLen,char * lpOutput)
{
    XByte bits[16];
    XByte btTmp;
    MD5Init();
    MD5Update((XByte *)lpInput,(XDWord)iInputLen);
    MD5Final();
    Encode(bits,FContext.state,16);
    char *p=lpOutput;
    for(int i=0;i<16;i++)
    {
        btTmp=bits[i];
        *p++=GetChar((XByte)((btTmp>>4)&0xf));
        *p++=GetChar((XByte)(btTmp&0xf));
    }
    *p=0;
    return lpOutput;
}
char XMD5::GetChar(XByte btValue)
{
    if(btValue<10) return (char)('0'+btValue);
    else return (char)('A'+btValue-10);
}

}