JavaScript实现的MD5算法完整实例
本文实例讲述了JavaScript实现MD5算法的方法。分享给大家供大家参考，具体如下：
/**
*
*MD5(Message-DigestAlgorithm)
*http://www.webtoolkit.info/
*
**/
varMD5=function(string){
functionRotateLeft(lValue,iShiftBits){
return(lValue<<iShiftBits)|(lValue>>>(32-iShiftBits));
}
functionAddUnsigned(lX,lY){
varlX4,lY4,lX8,lY8,lResult;
lX8=(lX&0x80000000);
lY8=(lY&0x80000000);
lX4=(lX&0x40000000);
lY4=(lY&0x40000000);
lResult=(lX&0x3FFFFFFF)+(lY&0x3FFFFFFF);
if(lX4&lY4){
return(lResult^0x80000000^lX8^lY8);
}
if(lX4|lY4){
if(lResult&0x40000000){
return(lResult^0xC0000000^lX8^lY8);
}else{
return(lResult^0x40000000^lX8^lY8);
}
}else{
return(lResult^lX8^lY8);
}
}
functionF(x,y,z){return(x&y)|((~x)&z);}
functionG(x,y,z){return(x&z)|(y&(~z));}
functionH(x,y,z){return(x^y^z);}
functionI(x,y,z){return(y^(x|(~z)));}
functionFF(a,b,c,d,x,s,ac){
a=AddUnsigned(a,AddUnsigned(AddUnsigned(F(b,c,d),x),ac));
returnAddUnsigned(RotateLeft(a,s),b);
};
functionGG(a,b,c,d,x,s,ac){
a=AddUnsigned(a,AddUnsigned(AddUnsigned(G(b,c,d),x),ac));
returnAddUnsigned(RotateLeft(a,s),b);
};
functionHH(a,b,c,d,x,s,ac){
a=AddUnsigned(a,AddUnsigned(AddUnsigned(H(b,c,d),x),ac));
returnAddUnsigned(RotateLeft(a,s),b);
};
functionII(a,b,c,d,x,s,ac){
a=AddUnsigned(a,AddUnsigned(AddUnsigned(I(b,c,d),x),ac));
returnAddUnsigned(RotateLeft(a,s),b);
};
functionConvertToWordArray(string){
varlWordCount;
varlMessageLength=string.length;
varlNumberOfWords_temp1=lMessageLength+8;
varlNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1%64))/64;
varlNumberOfWords=(lNumberOfWords_temp2+1)*16;
varlWordArray=Array(lNumberOfWords-1);
varlBytePosition=0;
varlByteCount=0;
while(lByteCount<lMessageLength){
lWordCount=(lByteCount-(lByteCount%4))/4;
lBytePosition=(lByteCount%4)*8;
lWordArray[lWordCount]=(lWordArray[lWordCount]|(string.charCodeAt(lByteCount)<<lBytePosition));
lByteCount++;
}
lWordCount=(lByteCount-(lByteCount%4))/4;
lBytePosition=(lByteCount%4)*8;
lWordArray[lWordCount]=lWordArray[lWordCount]|(0x80<<lBytePosition);
lWordArray[lNumberOfWords-2]=lMessageLength<<3;
lWordArray[lNumberOfWords-1]=lMessageLength>>>29;
returnlWordArray;
};
functionWordToHex(lValue){
varWordToHexValue="",WordToHexValue_temp="",lByte,lCount;
for(lCount=0;lCount<=3;lCount++){
lByte=(lValue>>>(lCount*8))&255;
WordToHexValue_temp="0"+lByte.toString(16);
WordToHexValue=WordToHexValue+WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
}
returnWordToHexValue;
};
functionUtf8Encode(string){
string=string.replace(/\r\n/g,"\n");
varutftext="";
for(varn=0;n<string.length;n++){
varc=string.charCodeAt(n);
if(c<128){
utftext+=String.fromCharCode(c);
}
elseif((c>127)&&(c<2048)){
utftext+=String.fromCharCode((c>>6)|192);
utftext+=String.fromCharCode((c&63)|128);
}
else{
utftext+=String.fromCharCode((c>>12)|224);
utftext+=String.fromCharCode(((c>>6)&63)|128);
utftext+=String.fromCharCode((c&63)|128);
}
}
returnutftext;
};
varx=Array();
vark,AA,BB,CC,DD,a,b,c,d;
varS11=7,S12=12,S13=17,S14=22;
varS21=5,S22=9,S23=14,S24=20;
varS31=4,S32=11,S33=16,S34=23;
varS41=6,S42=10,S43=15,S44=21;
string=Utf8Encode(string);
x=ConvertToWordArray(string);
a=0x67452301;b=0xEFCDAB89;c=0x98BADCFE;d=0x10325476;
for(k=0;k<x.length;k+=16){
AA=a;BB=b;CC=c;DD=d;
a=FF(a,b,c,d,x[k+0],S11,0xD76AA478);
d=FF(d,a,b,c,x[k+1],S12,0xE8C7B756);
c=FF(c,d,a,b,x[k+2],S13,0x242070DB);
b=FF(b,c,d,a,x[k+3],S14,0xC1BDCEEE);
a=FF(a,b,c,d,x[k+4],S11,0xF57C0FAF);
d=FF(d,a,b,c,x[k+5],S12,0x4787C62A);
c=FF(c,d,a,b,x[k+6],S13,0xA8304613);
b=FF(b,c,d,a,x[k+7],S14,0xFD469501);
a=FF(a,b,c,d,x[k+8],S11,0x698098D8);
d=FF(d,a,b,c,x[k+9],S12,0x8B44F7AF);
c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
a=GG(a,b,c,d,x[k+1],S21,0xF61E2562);
d=GG(d,a,b,c,x[k+6],S22,0xC040B340);
c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
b=GG(b,c,d,a,x[k+0],S24,0xE9B6C7AA);
a=GG(a,b,c,d,x[k+5],S21,0xD62F105D);
d=GG(d,a,b,c,x[k+10],S22,0x2441453);
c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
b=GG(b,c,d,a,x[k+4],S24,0xE7D3FBC8);
a=GG(a,b,c,d,x[k+9],S21,0x21E1CDE6);
d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
c=GG(c,d,a,b,x[k+3],S23,0xF4D50D87);
b=GG(b,c,d,a,x[k+8],S24,0x455A14ED);
a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
d=GG(d,a,b,c,x[k+2],S22,0xFCEFA3F8);
c=GG(c,d,a,b,x[k+7],S23,0x676F02D9);
b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
a=HH(a,b,c,d,x[k+5],S31,0xFFFA3942);
d=HH(d,a,b,c,x[k+8],S32,0x8771F681);
c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
a=HH(a,b,c,d,x[k+1],S31,0xA4BEEA44);
d=HH(d,a,b,c,x[k+4],S32,0x4BDECFA9);
c=HH(c,d,a,b,x[k+7],S33,0xF6BB4B60);
b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
d=HH(d,a,b,c,x[k+0],S32,0xEAA127FA);
c=HH(c,d,a,b,x[k+3],S33,0xD4EF3085);
b=HH(b,c,d,a,x[k+6],S34,0x4881D05);
a=HH(a,b,c,d,x[k+9],S31,0xD9D4D039);
d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
b=HH(b,c,d,a,x[k+2],S34,0xC4AC5665);
a=II(a,b,c,d,x[k+0],S41,0xF4292244);
d=II(d,a,b,c,x[k+7],S42,0x432AFF97);
c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
b=II(b,c,d,a,x[k+5],S44,0xFC93A039);
a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
d=II(d,a,b,c,x[k+3],S42,0x8F0CCC92);
c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
b=II(b,c,d,a,x[k+1],S44,0x85845DD1);
a=II(a,b,c,d,x[k+8],S41,0x6FA87E4F);
d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
c=II(c,d,a,b,x[k+6],S43,0xA3014314);
b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
a=II(a,b,c,d,x[k+4],S41,0xF7537E82);
d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
c=II(c,d,a,b,x[k+2],S43,0x2AD7D2BB);
b=II(b,c,d,a,x[k+9],S44,0xEB86D391);
a=AddUnsigned(a,AA);
b=AddUnsigned(b,BB);
c=AddUnsigned(c,CC);
d=AddUnsigned(d,DD);
}
vartemp=WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
returntemp.toLowerCase();
}
PS：这里再为大家提供2款MD5加密工具，需要的朋友可以参考一下：
MD5在线加密工具：
http://tools.jb51.net/password/CreateMD5Password
在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：
http://tools.jb51.net/password/hash_md5_sha
更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript数据结构与算法技巧总结》及《JavaScript数学运算用法总结》
希望本文所述对大家JavaScript程序设计有所帮助。