C语言 MD5的源码实例详解
C语言MD5源码
md5c.h:
/*POINTERdefinesagenericpointertype*/
typedefunsignedchar*POINTER;
/*UINT2definesatwobyteword*/
//typedefunsignedshortintUINT2;
/*UINT4definesafourbyteword*/
typedefunsignedlongintUINT4;
/*MD5context.*/
typedefstruct{
UINT4state[4];/*state(ABCD)*/
UINT4count[2];/*numberofbits,modulo2^64(lsbfirst)*/
unsignedcharbuffer[64];/*inputbuffer*/
}MD5_CTX;
voidMD5Init(MD5_CTX*context);
voidMD5Update(MD5_CTX*context,unsignedchar*input,unsignedintinputLen);
voidMD5UpdaterString(MD5_CTX*context,constchar*string);
intMD5FileUpdateFile(MD5_CTX*context,char*filename);
voidMD5Final(unsignedchardigest[16],MD5_CTX*context);
voidMDString(char*string,unsignedchardigest[16]);
intMD5File(char*filename,unsignedchardigest[16]);
md5c.c:
/*MD5C.C-RSADataSecurity,Inc.,MD5message-digestalgorithm
*/
/*Copyright(C)1991-2,RSADataSecurity,Inc.Created1991.All
rightsreserved.
Licensetocopyandusethissoftwareisgrantedprovidedthatit
isidentifiedasthe"RSADataSecurity,Inc.MD5Message-Digest
Algorithm"inallmaterialmentioningorreferencingthissoftware
orthisfunction.
Licenseisalsograntedtomakeandusederivativeworksprovided
thatsuchworksareidentifiedas"derivedfromtheRSAData
Security,Inc.MD5Message-DigestAlgorithm"inallmaterial
mentioningorreferencingthederivedwork.
RSADataSecurity,Inc.makesnorepresentationsconcerningeither
themerchantabilityofthissoftwareorthesuitabilityofthis
softwareforanyparticularpurpose.Itisprovided"asis"
withoutexpressorimpliedwarrantyofanykind.
Thesenoticesmustberetainedinanycopiesofanypartofthis
documentationand/orsoftware.
*/
#include"md5c.h"
#include<string.h>
#include<stdio.h>
/*ConstantsforMD5Transformroutine.
*/
#defineS117
#defineS1212
#defineS1317
#defineS1422
#defineS215
#defineS229
#defineS2314
#defineS2420
#defineS314
#defineS3211
#defineS3316
#defineS3423
#defineS416
#defineS4210
#defineS4315
#defineS4421
staticvoidMD5_memcpy(POINTERoutput,POINTERinput,unsignedintlen);
staticvoidMD5Transform(UINT4state[4],unsignedcharblock[64]);
staticvoidEncode(unsignedchar*output,UINT4*input,unsignedintlen);
staticvoidMD5_memset(POINTERoutput,intvalue,unsignedintlen);
staticvoidDecode(UINT4*output,unsignedchar*input,unsignedintlen);
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
};
/*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);\
}
/*MD5initialization.BeginsanMD5operation,writinganewcontext.
*/
voidMD5Init(MD5_CTX*context)/*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.
*/
voidMD5Update(MD5_CTX*context,unsignedchar*input,unsignedintinputLen)
{
unsignedinti,index,partLen;
/*Computenumberofbytesmod64*/
index=(unsignedint)((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+63<inputLen;i+=64)
MD5Transform(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.
*/
voidMD5Final(unsignedchardigest[16],MD5_CTX*context)
{
unsignedcharbits[8];
unsignedintindex,padLen;
/*Savenumberofbits*/
Encode(bits,context->count,8);
/*Padoutto56mod64.
*/
index=(unsignedint)((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.
*/
staticvoidMD5Transform(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));
}
/*Encodesinput(UINT4)intooutput(unsignedchar).Assumeslenis
amultipleof4.
*/
staticvoidEncode(unsignedchar*output,UINT4*input,unsignedintlen)
{
unsignedinti,j;
for(i=0,j=0;j<len;i++,j+=4){
output[j]=(unsignedchar)(input[i]&0xff);
output[j+1]=(unsignedchar)((input[i]>>8)&0xff);
output[j+2]=(unsignedchar)((input[i]>>16)&0xff);
output[j+3]=(unsignedchar)((input[i]>>24)&0xff);
}
}
/*Decodesinput(unsignedchar)intooutput(UINT4).Assumeslenis
amultipleof4.
*/
staticvoidDecode(UINT4*output,unsignedchar*input,unsignedintlen)
{
unsignedinti,j;
for(i=0,j=0;j<len;i++,j+=4)
output[i]=((UINT4)input[j])|(((UINT4)input[j+1])<<8)|
(((UINT4)input[j+2])<<16)|(((UINT4)input[j+3])<<24);
}
/*Note:Replace"forloop"withstandardmemcpyifpossible.
*/
staticvoidMD5_memcpy(POINTERoutput,POINTERinput,unsignedintlen)
{
unsignedinti;
for(i=0;i<len;i++)
output[i]=input[i];
}
/*Note:Replace"forloop"withstandardmemsetifpossible.
*/
staticvoidMD5_memset(POINTERoutput,intvalue,unsignedintlen)
{
unsignedinti;
for(i=0;i<len;i++)
((char*)output)[i]=(char)value;
}
/*Digestsastringandprintstheresult.
*/
voidMDString(char*string,unsignedchardigest[16])
{
MD5_CTXcontext;
unsignedintlen=strlen(string);
MD5Init(&context);
MD5Update(&context,(unsignedchar*)string,len);
MD5Final(digest,&context);
}
/*Digestsafileandprintstheresult.
*/
intMD5File(char*filename,unsignedchardigest[16])
{
FILE*file;
MD5_CTXcontext;
intlen;
unsignedcharbuffer[1024];
if((file=fopen(filename,"rb"))==NULL)
return-1;
else{
MD5Init(&context);
while(len=fread(buffer,1,1024,file))
MD5Update(&context,buffer,len);
MD5Final(digest,&context);
fclose(file);
}
return0;
}
voidMD5UpdaterString(MD5_CTX*context,constchar*string)
{
unsignedintlen=strlen(string);
MD5Update(context,(unsignedchar*)string,len);
}
intMD5FileUpdateFile(MD5_CTX*context,char*filename)
{
FILE*file;
intlen;
unsignedcharbuffer[1024];
if((file=fopen(filename,"rb"))==NULL)
return-1;
else{
while(len=fread(buffer,1,1024,file))
MD5Update(context,buffer,len);
fclose(file);
}
return0;
}
用法:
voidmain(void)
{
unsignedchardigest[16];//存放结果
//第一种用法:
MD5_CTXmd5c;
MD5Init(&md5c);//初始化
MD5UpdaterString(&md5c,"你要测试的字符串");
MD5FileUpdateFile(&md5c,"你要测试的文件路径");
MD5Final(digest,&md5c);
//第二种用法:
MDString("你要测试的字符串",digest);//直接输入字符串并得出结果
//第三种用法:
MD5File("你要测试的文件路径",digest);//直接输入文件路径并得出结果
}
相关文章：
C++MD5源码：https://www.nhooo.com/article/103113.htm
C语言MD5源码：https://www.nhooo.com/article/103108.htm
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