MD5算法.docx
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MD5算法
//MD5.h
/*
使用方法:
CMD5md5;
CStringcsMd5Buffer=md5.MD5("astring");
执行完成之后csMd5Buffer中即存储了由"astring"计算得到的MD5值:
3a315533c0f34762e0c45e3d4e9d525c
*/
#definePROTO_LIST(list)list
/*
ConstantsforMD5Transformroutine.
*/
#defineS117
#defineS1212
#defineS1317
#defineS1422
#defineS215
#defineS229
#defineS2314
#defineS2420
#defineS314
#defineS3211
#defineS3316
#defineS3423
#defineS416
#defineS4210
#defineS4315
#defineS4421
/*
F,G,HandIarebasicMD5functions.
*/
#defineF(x,y,z)(((x)&(y))|((~x)&(z)))
#defineG(x,y,z)(((x)&(z))|((y)&(~z)))
#defineH(x,y,z)((x)^(y)^(z))
#defineI(x,y,z)((y)^((x)|(~z)))
/*
ROTATE_LEFTrotatesxleftnbits.
*/
#defineROTATE_LEFT(x,n)(((x)<<(n))|((x)>>(32-(n))))
/*
FF,GG,HH,andIItransformationsforrounds1,2,3,and4.
Rotationisseparatefromadditiontopreventrecomputation.
*/
#defineFF(a,b,c,d,x,s,ac){(a)+=F((b),(c),(d))+(x)+(UINT4)(ac);(a)=ROTATE_LEFT((a),(s));(a)+=(b);}
#defineGG(a,b,c,d,x,s,ac){(a)+=G((b),(c),(d))+(x)+(UINT4)(ac);(a)=ROTATE_LEFT((a),(s));(a)+=(b);}
#defineHH(a,b,c,d,x,s,ac){(a)+=H((b),(c),(d))+(x)+(UINT4)(ac);(a)=ROTATE_LEFT((a),(s));(a)+=(b);}
#defineII(a,b,c,d,x,s,ac){(a)+=I((b),(c),(d))+(x)+(UINT4)(ac);(a)=ROTATE_LEFT((a),(s));(a)+=(b);}
#defineTEST_BLOCK_LEN1000
#defineTEST_BLOCK_COUNT1000
staticunsignedcharPADDING[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,
};
//CMD5类
classCMD5
{
private:
/*POINTERdefinesagenericpointertype*/
typedefunsignedchar*POINTER;
/*UINT2definesatwobyteword*/
typedefunsignedshortintUINT2;
/*UINT4definesafourbyteword*/
typedefunsignedlongintUINT4;
/*MD5context.*/
typedefstruct_MD5_CTX
{
UINT4state[4];/*state(ABCD)*/
UINT4count[2];/*numberofbits,modulo2^64(lsbfirst)*/
unsignedcharbuffer[64];/*inputbuffer*/
}MD5_CTX;
public:
CMD5(void);
~CMD5(void);
public:
CStringMD5(INconstchar*szText);
private:
CMD5(CMD5&ObjMd5);//禁用拷贝构造函数
CMD5&operator=(CMD5&ObjMd5);//禁用等号
private:
voidMD5TransformPROTO_LIST((UINT4[4],unsignedchar[64]));
voidMD5_memcpyPROTO_LIST((POINTER,POINTER,size_t));
voidMD5_memsetPROTO_LIST((POINTER,int,size_t));
voidMD5InitPROTO_LIST((MD5_CTX*));
voidMD5UpdatePROTO_LIST((MD5_CTX*,unsignedchar*,size_t));
voidMD5FinalPROTO_LIST((unsignedchar[16],MD5_CTX*));
voidStringAddOnePROTO_LIST((char*));
voidEncodePROTO_LIST((unsignedchar*,UINT4*,size_t));
voidDecodePROTO_LIST((UINT4*,unsignedchar*,size_t));
};
//MD5.cpp//
//MD5.cpp:
定义DLL应用程序的入口点。
//
#include"stdafx.h"
#include
#include
#include
#include
#include
#include"MD5.h"
//有关类定义的信息,请参阅MD5.h
CMD5:
:
CMD5()
{
}
CMD5:
:
~CMD5(void)
{
}
/*
Digestsastringandprintstheresult.
*/
CStringCMD5:
:
MD5(INconstchar*szText)
{
charszMD5StringBuffer[33];
memset(szMD5StringBuffer,0,33);
MD5_CTXcontext;
MD5Init(&context);
MD5Update(&context,(unsignedchar*)szText,strlen(szText));
unsignedchardigest[16];
MD5Final(digest,&context);
for(inti=0;i<16;i++)
{
sprintf(&(szMD5StringBuffer[2*i]),"%02x",(unsignedchar)digest[i]);
}
returnCString(szMD5StringBuffer);
}
/*
MD5initialization.BeginsanMD5operation,writinganewcontext.
*/
voidCMD5:
:
MD5Init(MD5_CTX*context)
{
context->count[0]=context->count[1]=0;
/*
Loadmagicinitializationconstants.
*/
context->state[0]=0x67452301;
context->state[1]=0xefcdab89;
context->state[2]=0x98badcfe;
context->state[3]=0x10325476;
}
/*
MD5blockupdateoperation.ContinuesanMD5message-digest
operation,processinganothermessageblock,andupdatingthe
context.
*/
voidCMD5:
:
MD5Update(
MD5_CTX*context,/*context*/
unsignedchar*input,/*inputblock*/
size_tinputLen/*lengthofinputblock*/
)
{
size_ti,index,partLen;
/*Computenumberofbytesmod64*/
index=(size_t)((context->count[0]>>3)&0x3F);
/*Updatenumberofbits*/
if((context->count[0]+=((UINT4)inputLen<<3))
<((UINT4)inputLen<<3))
context->count[1]++;
context->count[1]+=((UINT4)inputLen>>29);
partLen=64-index;
/*Transformasmanytimesaspossible.*/
if(inputLen>=partLen){
MD5_memcpy
((POINTER)&context->buffer[index],(POINTER)input,partLen);
MD5Transform(context->state,context->buffer);
for(i=partLen;i+63MD5Transform(context->state,&input[i]);
index=0;
}
else
i=0;
/*Bufferremaininginput*/
MD5_memcpy
((POINTER)&context->buffer[index],(POINTER)&input[i],
inputLen-i);
}
/*
MD5finalization.EndsanMD5message-digestoperation,writingthe
themessagedigestandzeroizingthecontext.
*/
voidCMD5:
:
MD5Final(
unsignedchardigest[16],/*messagedigest*/
MD5_CTX*context/*context*/
)
{
unsignedcharbits[8];
size_tindex,padLen;
/*Savenumberofbits*/
Encode(bits,context->count,8);
/*Padoutto56mod64.*/
index=(size_t)((context->count[0]>>3)&0x3f);
padLen=(index<56)?
(56-index):
(120-index);
MD5Update(context,PADDING,padLen);
/*Appendlength(beforepadding)*/
MD5Update(context,bits,8);
/*Storestateindigest*/
Encode(digest,context->state,16);
/*Zeroizesensitiveinformation.*/
MD5_memset((POINTER)context,0,sizeof(*context));
}
/*
MD5basictransformation.Transformsstatebasedonblock.
*/
voidCMD5:
:
MD5Transform(
UINT4state[4],
unsignedcharblock[64]
)
{
UINT4a=state[0],b=state[1],c=state[2],d=state[3],x[16];
Decode(x,block,64);
/*Round1*/
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*/
/*Round2*/
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*/
/*Round3*/
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*/
/*Round4*/
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;
/*Zeroizesensitiveinformation.*/
MD5_memset((POINTER)x,0,sizeof(x));
}
/*
Encode