加密与解密
C语言实现MD5算法：#ifndef _MD5_H
#define _MD5_H
#ifndef PROTOTYPES
# if __STDC__
#define PROTOTYPES 1
# else
#define PROTOTYPES 0
# endif
#endif
typedefunsignedchar*POINTER;
typedefunsignedshortintUINT2;
#if defined(__alpha) && (defined(__osf__) || defined(__linux__))
typedefunsignedintUINT4;
#else
typedefunsignedlongintUINT4;
#endif
#ifPROTOTYPES
#definePROTO_LIST(list)list
#else
#definePROTO_LIST(list)()
#endif
typedefstruct{
UINT4state;
UINT4count;
unsignedcharbuffer;
}MD5_CTX;
voidMD5InitPROTO_LIST((MD5_CTX*));
voidMD5UpdatePROTO_LIST
((MD5_CTX*,unsignedchar*,unsignedint));
voidMD5FinalPROTO_LIST((unsignedchar,MD5_CTX*,unsignedchar*));
#endif
#include"md5.h"
#defineS117
#defineS1212
#defineS1317
#defineS1422
#defineS215
#defineS229
#defineS2314
#defineS2420
#defineS314
#defineS3211
#defineS3316
#defineS3423
#defineS416
#defineS4210
#defineS4315
#defineS4421
voidMD5TransformPROTO_LIST((UINT4,unsignedchar));
voidEncodePROTO_LIST
((unsignedchar*,UINT4*,unsignedint));
voidDecodePROTO_LIST
((UINT4*,unsignedchar*,unsignedint));
voidMD5_memcpyPROTO_LIST((POINTER,POINTER,unsignedint));
voidMD5_memsetPROTO_LIST((POINTER,int,unsignedint));
#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)))
#defineROTATE_LEFT(x,n)(((x)>(32-(n))) )
#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); }
voidMD5Init(context)
MD5_CTX*context;
{
context->count=context->count=0;
context->state=0x67452301;
context->state=0xefcdab89;
context->state=0x98badcfe;
context->state=0x10325476;
}
voidMD5Update(context,input,inputLen)
MD5_CTX*context;
unsignedchar*input;
unsignedintinputLen;
{unsignedinti,index,partLen;
index=(unsignedint)((context->count>>3)&0x3F);
if((context->count+=((UINT4)inputLencount++;
context->count+=((UINT4)inputLen>>29);
partLen=64-index;
if(inputLen>=partLen){
MD5_memcpy
((POINTER)&context->buffer,(POINTER)input,partLen);
MD5Transform(context->state,context->buffer);
for(i=partLen;i+63state,&input);
index=0;
}
else
i=0;
MD5_memcpy
((POINTER)&context->buffer,(POINTER)&input,
inputLen-i);
}
voidMD5Final(digest,context,padding)
unsignedchardigest;
MD5_CTX*context;
unsignedchar*padding;
{unsignedcharbits;
unsignedintindex,padLen;
Encode(bits,context->count,8);
index=(unsignedint)((context->count>>3)&0x3f);
padLen=(indexstate,16);
MD5_memset((POINTER)context,0,sizeof(*context));
}
voidMD5Transform(state,block)
UINT4state;
unsignedcharblock;
{
UINT4a=state,b=state,c=state,d=state,x;
Decode(x,block,64);
FF(a,b,c,d,x,S11,0xd76aa478);/*1*/
FF(d,a,b,c,x,S12,0xe8c7b756);/*2*/
FF(c,d,a,b,x,S13,0x242070db);/*3*/
FF(b,c,d,a,x,S14,0xc1bdceee);/*4*/
FF(a,b,c,d,x,S11,0xf57c0faf);/*5*/
FF(d,a,b,c,x,S12,0x4787c62a);/*6*/
FF(c,d,a,b,x,S13,0xa8304613);/*7*/
FF(b,c,d,a,x,S14,0xfd469501);/*8*/
FF(a,b,c,d,x,S11,0x698098d8);/*9*/
FF(d,a,b,c,x,S12,0x8b44f7af);/*10*/
FF(c,d,a,b,x,S13,0xffff5bb1);/*11*/
FF(b,c,d,a,x,S14,0x895cd7be);/*12*/
FF(a,b,c,d,x,S11,0x6b901122);/*13*/
FF(d,a,b,c,x,S12,0xfd987193);/*14*/
FF(c,d,a,b,x,S13,0xa679438e);/*15*/
FF(b,c,d,a,x,S14,0x49b40821);/*16*/
GG(a,b,c,d,x,S21,0xf61e2562);/*17*/
GG(d,a,b,c,x,S22,0xc040b340);/*18*/
GG(c,d,a,b,x,S23,0x265e5a51);/*19*/
GG(b,c,d,a,x,S24,0xe9b6c7aa);/*20*/
GG(a,b,c,d,x,S21,0xd62f105d);/*21*/
GG(d,a,b,c,x,S22,0x2441453);/*22*/
GG(c,d,a,b,x,S23,0xd8a1e681);/*23*/
GG(b,c,d,a,x,S24,0xe7d3fbc8);/*24*/
GG(a,b,c,d,x,S21,0x21e1cde6);/*25*/
GG(d,a,b,c,x,S22,0xc33707d6);/*26*/
GG(c,d,a,b,x,S23,0xf4d50d87);/*27*/
GG(b,c,d,a,x,S24,0x455a14ed);/*28*/
GG(a,b,c,d,x,S21,0xa9e3e905);/*29*/
GG(d,a,b,c,x,S22,0xfcefa3f8);/*30*/
GG(c,d,a,b,x,S23,0x676f02d9);/*31*/
GG(b,c,d,a,x,S24,0x8d2a4c8a);/*32*/
HH(a,b,c,d,x,S31,0xfffa3942);/*33*/
HH(d,a,b,c,x,S32,0x8771f681);/*34*/
HH(c,d,a,b,x,S33,0x6d9d6122);/*35*/
HH(b,c,d,a,x,S34,0xfde5380c);/*36*/
HH(a,b,c,d,x,S31,0xa4beea44);/*37*/
HH(d,a,b,c,x,S32,0x4bdecfa9);/*38*/
HH(c,d,a,b,x,S33,0xf6bb4b60);/*39*/
HH(b,c,d,a,x,S34,0xbebfbc70);/*40*/
HH(a,b,c,d,x,S31,0x289b7ec6);/*41*/
HH(d,a,b,c,x,S32,0xeaa127fa);/*42*/
HH(c,d,a,b,x,S33,0xd4ef3085);/*43*/
HH(b,c,d,a,x,S34,0x4881d05);/*44*/
HH(a,b,c,d,x,S31,0xd9d4d039);/*45*/
HH(d,a,b,c,x,S32,0xe6db99e5);/*46*/
HH(c,d,a,b,x,S33,0x1fa27cf8);/*47*/
HH(b,c,d,a,x,S34,0xc4ac5665);/*48*/
II(a,b,c,d,x,S41,0xf4292244);/*49*/
II(d,a,b,c,x,S42,0x432aff97);/*50*/
II(c,d,a,b,x,S43,0xab9423a7);/*51*/
II(b,c,d,a,x,S44,0xfc93a039);/*52*/
II(a,b,c,d,x,S41,0x655b59c3);/*53*/
II(d,a,b,c,x,S42,0x8f0ccc92);/*54*/
II(c,d,a,b,x,S43,0xffeff47d);/*55*/
II(b,c,d,a,x,S44,0x85845dd1);/*56*/
II(a,b,c,d,x,S41,0x6fa87e4f);/*57*/
II(d,a,b,c,x,S42,0xfe2ce6e0);/*58*/
II(c,d,a,b,x,S43,0xa3014314);/*59*/
II(b,c,d,a,x,S44,0x4e0811a1);/*60*/
II(a,b,c,d,x,S41,0xf7537e82);/*61*/
II(d,a,b,c,x,S42,0xbd3af235);/*62*/
II(c,d,a,b,x,S43,0x2ad7d2bb);/*63*/
II(b,c,d,a,x,S44,0xeb86d391);/*64*/
state+=a;
state+=b;
state+=c;
state+=d;
MD5_memset((POINTER)x,0,sizeof(x));
}
voidEncode(output,input,len)
unsignedchar*output;
UINT4*input;
unsignedintlen;
{unsignedinti,j;
for(i=0,j=0;j>8)&0xff);
output=(unsignedchar)((input>>16)&0xff);
output=(unsignedchar)((input>>24)&0xff);
}
}
voidDecode(output,input,len)
UINT4*output;
unsignedchar*input;
unsignedintlen;
{unsignedinti,j;
for(i=0,j=0;j<len;i++,j+=4)
output=((UINT4)input)|(((UINT4)input)<<8)|
(((UINT4)input)<<16)|(((UINT4)input)<<24);
}
voidMD5_memcpy(output,input,len)
POINTERoutput;
POINTERinput;
unsignedintlen;
{unsignedinti;
for(i=0;i<len;i++)
output=input;
}
voidMD5_memset(output,value,len)
POINTERoutput;
intvalue;
unsignedintlen;
{ unsignedinti;
for(i=0;i<len;i++)
((char*)output)=(char)value;
}
voidcalculateMd5Digits(char*md5buf,char*passout,intlength)
{MD5_CTX context;
unsignedcharpadding={
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
};
MD5Init(&context);
MD5Update(&context,md5buf,length);
MD5Final(passout,&context,padding);
}
有点晕 O(∩_∩)O"
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