JS常用加密编码与算法实例总结
本文实例讲述了JS常用加密编码与算法。分享给大家供大家参考，具体如下：
一：UTF8编码函数
functionURLEncode(Str){
if(Str==null||Str=="")
return"";
varnewStr="";
functiontoCase(sStr){
returnsStr.toString(16).toUpperCase();
}
for(vari=0,icode,len=Str.length;i<len;i++){
icode=Str.charCodeAt(i);
if(icode<0x10)
newStr+="%0"+icode.toString(16).toUpperCase();
elseif(icode<0x80){
if(icode==0x20)
newStr+="+";
elseif((icode>=0x30&&icode<=0x39)||(icode>=0x41&&icode<=0x5A)||(icode>=0x61&&icode<=0x7A))
newStr+=Str.charAt(i);
else
newStr+="%"+toCase(icode);
}
elseif(icode<0x800){
newStr+="%"+toCase(0xC0+(icode>>6));
newStr+="%"+toCase(0x80+icode%0x40);
}
else{
newStr+="%"+toCase(0xE0+(icode>>12));
newStr+="%"+toCase(0x80+(icode>>6)%0x40);
newStr+="%"+toCase(0x80+icode%0x40);
}
}
returnnewStr;
}
二：Base64编码,解码函数
varbase64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
varbase64DecodeChars=newArray(
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,
-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,
15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,
-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1);
functionbase64encode(str){
varout,i,len;
varc1,c2,c3;
len=str.length;
i=0;
out="";
while(i<len){
c1=str.charCodeAt(i++)&0xff;
if(i==len)
{
out+=base64EncodeChars.charAt(c1>>2);
out+=base64EncodeChars.charAt((c1&0x3)<<4);
out+="==";
break;
}
c2=str.charCodeAt(i++);
if(i==len)
{
out+=base64EncodeChars.charAt(c1>>2);
out+=base64EncodeChars.charAt(((c1&0x3)<<4)|((c2&0xF0)>>4));
out+=base64EncodeChars.charAt((c2&0xF)<<2);
out+="=";
break;
}
c3=str.charCodeAt(i++);
out+=base64EncodeChars.charAt(c1>>2);
out+=base64EncodeChars.charAt(((c1&0x3)<<4)|((c2&0xF0)>>4));
out+=base64EncodeChars.charAt(((c2&0xF)<<2)|((c3&0xC0)>>6));
out+=base64EncodeChars.charAt(c3&0x3F);
}
returnout;
}
functionbase64decode(str){
varc1,c2,c3,c4;
vari,len,out;
len=str.length;
i=0;
out="";
while(i<len){
/*c1*/
do{
c1=base64DecodeChars[str.charCodeAt(i++)&0xff];
}while(i<len&&c1==-1);
if(c1==-1)
break;
/*c2*/
do{
c2=base64DecodeChars[str.charCodeAt(i++)&0xff];
}while(i<len&&c2==-1);
if(c2==-1)
break;
out+=String.fromCharCode((c1<<2)|((c2&0x30)>>4));
/*c3*/
do{
c3=str.charCodeAt(i++)&0xff;
if(c3==61)
returnout;
c3=base64DecodeChars[c3];
}while(i<len&&c3==-1);
if(c3==-1)
break;
out+=String.fromCharCode(((c2&0XF)<<4)|((c3&0x3C)>>2));
/*c4*/
do{
c4=str.charCodeAt(i++)&0xff;
if(c4==61)
returnout;
c4=base64DecodeChars[c4];
}while(i<len&&c4==-1);
if(c4==-1)
break;
out+=String.fromCharCode(((c3&0x03)<<6)|c4);
}
returnout;
}
functionutf16to8(str){
varout,i,len,c;
out="";
len=str.length;
for(i=0;i<len;i++){
c=str.charCodeAt(i);
if((c>=0x0001)&&(c<=0x007F)){
out+=str.charAt(i);
}elseif(c>0x07FF){
out+=String.fromCharCode(0xE0|((c>>12)&0x0F));
out+=String.fromCharCode(0x80|((c>>6)&0x3F));
out+=String.fromCharCode(0x80|((c>>0)&0x3F));
}else{
out+=String.fromCharCode(0xC0|((c>>6)&0x1F));
out+=String.fromCharCode(0x80|((c>>0)&0x3F));
}
}
returnout;
}
functionutf8to16(str){
varout,i,len,c;
varchar2,char3;
out="";
len=str.length;
i=0;
while(i<len){
c=str.charCodeAt(i++);
switch(c>>4)
{
case0:case1:case2:case3:case4:case5:case6:case7:
//0xxxxxxx
out+=str.charAt(i-1);
break;
case12:case13:
//110xxxxx10xxxxxx
char2=str.charCodeAt(i++);
out+=String.fromCharCode(((c&0x1F)<<6)|(char2&0x3F));
break;
case14:
//1110xxxx10xxxxxx10xxxxxx
char2=str.charCodeAt(i++);
char3=str.charCodeAt(i++);
out+=String.fromCharCode(((c&0x0F)<<12)|
((char2&0x3F)<<6)|
((char3&0x3F)<<0));
break;
}
}
returnout;
}
functiondoit(){
varf=document.f
f.output.value=base64encode(utf16to8(f.source.value))
f.decode.value=utf8to16(base64decode(f.output.value))
}
三：MD5
/*
*AJavaScriptimplementationoftheRSADataSecurity,Inc.MD5Message
*DigestAlgorithm,asdefinedinRFC1321.
*Version2.1Copyright(C)PaulJohnston1999-2002.
*Othercontributors:GregHolt,AndrewKepert,Ydnar,Lostinet
*DistributedundertheBSDLicense
*Seehttp://pajhome.org.uk/crypt/md5formoreinfo.
*/
/*
*Configurablevariables.Youmayneedtotweakthesetobecompatiblewith
*theserver-side,butthedefaultsworkinmostcases.
*/
varhexcase=0;/*hexoutputformat.0-lowercase;1-uppercase*/
varb64pad="";/*base-64padcharacter."="forstrictRFCcompliance*/
varchrsz=8;/*bitsperinputcharacter.8-ASCII;16-Unicode*/
/*
*Thesearethefunctionsyou'llusuallywanttocall
*Theytakestringargumentsandreturneitherhexorbase-64encodedstrings
*/
functionhex_md5(s){returnbinl2hex(core_md5(str2binl(s),s.length*chrsz));}
functionb64_md5(s){returnbinl2b64(core_md5(str2binl(s),s.length*chrsz));}
functionstr_md5(s){returnbinl2str(core_md5(str2binl(s),s.length*chrsz));}
functionhex_hmac_md5(key,data){returnbinl2hex(core_hmac_md5(key,data));}
functionb64_hmac_md5(key,data){returnbinl2b64(core_hmac_md5(key,data));}
functionstr_hmac_md5(key,data){returnbinl2str(core_hmac_md5(key,data));}
/*
*Performasimpleself-testtoseeiftheVMisworking
*/
functionmd5_vm_test()
{
returnhex_md5("abc")=="900150983cd24fb0d6963f7d28e17f72";
}
/*
*CalculatetheMD5ofanarrayoflittle-endianwords,andabitlength
*/
functioncore_md5(x,len)
{
/*appendpadding*/
x[len>>5]|=0x80<<((len)%32);
x[(((len+64)>>>9)<<4)+14]=len;
vara=1732584193;
varb=-271733879;
varc=-1732584194;
vard=271733878;
for(vari=0;i<x.length;i+=16)
{
varolda=a;
varoldb=b;
varoldc=c;
varoldd=d;
a=md5_ff(a,b,c,d,x[i+0],7,-680876936);
d=md5_ff(d,a,b,c,x[i+1],12,-389564586);
c=md5_ff(c,d,a,b,x[i+2],17,606105819);
b=md5_ff(b,c,d,a,x[i+3],22,-1044525330);
a=md5_ff(a,b,c,d,x[i+4],7,-176418897);
d=md5_ff(d,a,b,c,x[i+5],12,1200080426);
c=md5_ff(c,d,a,b,x[i+6],17,-1473231341);
b=md5_ff(b,c,d,a,x[i+7],22,-45705983);
a=md5_ff(a,b,c,d,x[i+8],7,1770035416);
d=md5_ff(d,a,b,c,x[i+9],12,-1958414417);
c=md5_ff(c,d,a,b,x[i+10],17,-42063);
b=md5_ff(b,c,d,a,x[i+11],22,-1990404162);
a=md5_ff(a,b,c,d,x[i+12],7,1804603682);
d=md5_ff(d,a,b,c,x[i+13],12,-40341101);
c=md5_ff(c,d,a,b,x[i+14],17,-1502002290);
b=md5_ff(b,c,d,a,x[i+15],22,1236535329);
a=md5_gg(a,b,c,d,x[i+1],5,-165796510);
d=md5_gg(d,a,b,c,x[i+6],9,-1069501632);
c=md5_gg(c,d,a,b,x[i+11],14,643717713);
b=md5_gg(b,c,d,a,x[i+0],20,-373897302);
a=md5_gg(a,b,c,d,x[i+5],5,-701558691);
d=md5_gg(d,a,b,c,x[i+10],9,38016083);
c=md5_gg(c,d,a,b,x[i+15],14,-660478335);
b=md5_gg(b,c,d,a,x[i+4],20,-405537848);
a=md5_gg(a,b,c,d,x[i+9],5,568446438);
d=md5_gg(d,a,b,c,x[i+14],9,-1019803690);
c=md5_gg(c,d,a,b,x[i+3],14,-187363961);
b=md5_gg(b,c,d,a,x[i+8],20,1163531501);
a=md5_gg(a,b,c,d,x[i+13],5,-1444681467);
d=md5_gg(d,a,b,c,x[i+2],9,-51403784);
c=md5_gg(c,d,a,b,x[i+7],14,1735328473);
b=md5_gg(b,c,d,a,x[i+12],20,-1926607734);
a=md5_hh(a,b,c,d,x[i+5],4,-378558);
d=md5_hh(d,a,b,c,x[i+8],11,-2022574463);
c=md5_hh(c,d,a,b,x[i+11],16,1839030562);
b=md5_hh(b,c,d,a,x[i+14],23,-35309556);
a=md5_hh(a,b,c,d,x[i+1],4,-1530992060);
d=md5_hh(d,a,b,c,x[i+4],11,1272893353);
c=md5_hh(c,d,a,b,x[i+7],16,-155497632);
b=md5_hh(b,c,d,a,x[i+10],23,-1094730640);
a=md5_hh(a,b,c,d,x[i+13],4,681279174);
d=md5_hh(d,a,b,c,x[i+0],11,-358537222);
c=md5_hh(c,d,a,b,x[i+3],16,-722521979);
b=md5_hh(b,c,d,a,x[i+6],23,76029189);
a=md5_hh(a,b,c,d,x[i+9],4,-640364487);
d=md5_hh(d,a,b,c,x[i+12],11,-421815835);
c=md5_hh(c,d,a,b,x[i+15],16,530742520);
b=md5_hh(b,c,d,a,x[i+2],23,-995338651);
a=md5_ii(a,b,c,d,x[i+0],6,-198630844);
d=md5_ii(d,a,b,c,x[i+7],10,1126891415);
c=md5_ii(c,d,a,b,x[i+14],15,-1416354905);
b=md5_ii(b,c,d,a,x[i+5],21,-57434055);
a=md5_ii(a,b,c,d,x[i+12],6,1700485571);
d=md5_ii(d,a,b,c,x[i+3],10,-1894986606);
c=md5_ii(c,d,a,b,x[i+10],15,-1051523);
b=md5_ii(b,c,d,a,x[i+1],21,-2054922799);
a=md5_ii(a,b,c,d,x[i+8],6,1873313359);
d=md5_ii(d,a,b,c,x[i+15],10,-30611744);
c=md5_ii(c,d,a,b,x[i+6],15,-1560198380);
b=md5_ii(b,c,d,a,x[i+13],21,1309151649);
a=md5_ii(a,b,c,d,x[i+4],6,-145523070);
d=md5_ii(d,a,b,c,x[i+11],10,-1120210379);
c=md5_ii(c,d,a,b,x[i+2],15,718787259);
b=md5_ii(b,c,d,a,x[i+9],21,-343485551);
a=safe_add(a,olda);
b=safe_add(b,oldb);
c=safe_add(c,oldc);
d=safe_add(d,oldd);
}
returnArray(a,b,c,d);
}
/*
*Thesefunctionsimplementthefourbasicoperationsthealgorithmuses.
*/
functionmd5_cmn(q,a,b,x,s,t)
{
returnsafe_add(bit_rol(safe_add(safe_add(a,q),safe_add(x,t)),s),b);
}
functionmd5_ff(a,b,c,d,x,s,t)
{
returnmd5_cmn((b&c)|((~b)&d),a,b,x,s,t);
}
functionmd5_gg(a,b,c,d,x,s,t)
{
returnmd5_cmn((b&d)|(c&(~d)),a,b,x,s,t);
}
functionmd5_hh(a,b,c,d,x,s,t)
{
returnmd5_cmn(b^c^d,a,b,x,s,t);
}
functionmd5_ii(a,b,c,d,x,s,t)
{
returnmd5_cmn(c^(b|(~d)),a,b,x,s,t);
}
/*
*CalculatetheHMAC-MD5,ofakeyandsomedata
*/
functioncore_hmac_md5(key,data)
{
varbkey=str2binl(key);
if(bkey.length>16)bkey=core_md5(bkey,key.length*chrsz);
varipad=Array(16),opad=Array(16);
for(vari=0;i<16;i++)
{
ipad[i]=bkey[i]^0x36363636;
opad[i]=bkey[i]^0x5C5C5C5C;
}
varhash=core_md5(ipad.concat(str2binl(data)),512+data.length*chrsz);
returncore_md5(opad.concat(hash),512+128);
}
/*
*Addintegers,wrappingat2^32.Thisuses16-bitoperationsinternally
*toworkaroundbugsinsomeJSinterpreters.
*/
functionsafe_add(x,y)
{
varlsw=(x&0xFFFF)+(y&0xFFFF);
varmsw=(x>>16)+(y>>16)+(lsw>>16);
return(msw<<16)|(lsw&0xFFFF);
}
/*
*Bitwiserotatea32-bitnumbertotheleft.
*/
functionbit_rol(num,cnt)
{
return(num<<cnt)|(num>>>(32-cnt));
}
/*
*Convertastringtoanarrayoflittle-endianwords
*IfchrszisASCII,characters>255havetheirhi-bytesilentlyignored.
*/
functionstr2binl(str)
{
varbin=Array();
varmask=(1<<chrsz)-1;
for(vari=0;i<str.length*chrsz;i+=chrsz)
bin[i>>5]|=(str.charCodeAt(i/chrsz)&mask)<<(i%32);
returnbin;
}
/*
*Convertanarrayoflittle-endianwordstoastring
*/
functionbinl2str(bin)
{
varstr="";
varmask=(1<<chrsz)-1;
for(vari=0;i<bin.length*32;i+=chrsz)
str+=String.fromCharCode((bin[i>>5]>>>(i%32))&mask);
returnstr;
}
/*
*Convertanarrayoflittle-endianwordstoahexstring.
*/
functionbinl2hex(binarray)
{
varhex_tab=hexcase?"0123456789ABCDEF":"0123456789abcdef";
varstr="";
for(vari=0;i<binarray.length*4;i++)
{
str+=hex_tab.charAt((binarray[i>>2]>>((i%4)*8+4))&0xF)+
hex_tab.charAt((binarray[i>>2]>>((i%4)*8))&0xF);
}
returnstr;
}
/*
*Convertanarrayoflittle-endianwordstoabase-64string
*/
functionbinl2b64(binarray)
{
vartab="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
varstr="";
for(vari=0;i<binarray.length*4;i+=3)
{
vartriplet=(((binarray[i>>2]>>8*(i%4))&0xFF)<<16)
|(((binarray[i+1>>2]>>8*((i+1)%4))&0xFF)<<8)
|((binarray[i+2>>2]>>8*((i+2)%4))&0xFF);
for(varj=0;j<4;j++)
{
if(i*8+j*6>binarray.length*32)str+=b64pad;
elsestr+=tab.charAt((triplet>>6*(3-j))&0x3F);
}
}
returnstr;
}
MD4算法
/*
*AJavaScriptimplementationoftheRSADataSecurity,Inc.MD4Message
*DigestAlgorithm,asdefinedinRFC1320.
*Version2.1Copyright(C)JerradPierce,PaulJohnston1999-2002.
*Othercontributors:GregHolt,AndrewKepert,Ydnar,Lostinet
*DistributedundertheBSDLicense
*Seehttp://pajhome.org.uk/crypt/md5formoreinfo.
*/
/*
*Configurablevariables.Youmayneedtotweakthesetobecompatiblewith
*theserver-side,butthedefaultsworkinmostcases.
*/
varhexcase=0;/*hexoutputformat.0-lowercase;1-uppercase*/
varb64pad="";/*base-64padcharacter."="forstrictRFCcompliance*/
varchrsz=8;/*bitsperinputcharacter.8-ASCII;16-Unicode*/
/*
*Thesearethefunctionsyou'llusuallywanttocall
*/
functionhex_md4(s){returnbinl2hex(core_md4(str2binl(s),s.length*chrsz));}
functionb64_md4(s){returnbinl2b64(core_md4(str2binl(s),s.length*chrsz));}
functionstr_md4(s){returnbinl2str(core_md4(str2binl(s),s.length*chrsz));}
functionhex_hmac_md4(key,data){returnbinl2hex(core_hmac_md4(key,data));}
functionb64_hmac_md4(key,data){returnbinl2b64(core_hmac_md4(key,data));}
functionstr_hmac_md4(key,data){returnbinl2str(core_hmac_md4(key,data));}
/*
*Performasimpleself-testtoseeiftheVMisworking
*/
functionmd4_vm_test()
{
returnhex_md4("abc")=="a448017aaf21d8525fc10ae87aa6729d";
}
/*
*CalculatetheMD4ofanarrayoflittle-endianwords,andabitlength
*/
functioncore_md4(x,len)
{
/*appendpadding*/
x[len>>5]|=0x80<<(len%32);
x[(((len+64)>>>9)<<4)+14]=len;
vara=1732584193;
varb=-271733879;
varc=-1732584194;
vard=271733878;
for(vari=0;i<x.length;i+=16)
{
varolda=a;
varoldb=b;
varoldc=c;
varoldd=d;
a=md4_ff(a,b,c,d,x[i+0],3);
d=md4_ff(d,a,b,c,x[i+1],7);
c=md4_ff(c,d,a,b,x[i+2],11);
b=md4_ff(b,c,d,a,x[i+3],19);
a=md4_ff(a,b,c,d,x[i+4],3);
d=md4_ff(d,a,b,c,x[i+5],7);
c=md4_ff(c,d,a,b,x[i+6],11);
b=md4_ff(b,c,d,a,x[i+7],19);
a=md4_ff(a,b,c,d,x[i+8],3);
d=md4_ff(d,a,b,c,x[i+9],7);
c=md4_ff(c,d,a,b,x[i+10],11);
b=md4_ff(b,c,d,a,x[i+11],19);
a=md4_ff(a,b,c,d,x[i+12],3);
d=md4_ff(d,a,b,c,x[i+13],7);
c=md4_ff(c,d,a,b,x[i+14],11);
b=md4_ff(b,c,d,a,x[i+15],19);
a=md4_gg(a,b,c,d,x[i+0],3);
d=md4_gg(d,a,b,c,x[i+4],5);
c=md4_gg(c,d,a,b,x[i+8],9);
b=md4_gg(b,c,d,a,x[i+12],13);
a=md4_gg(a,b,c,d,x[i+1],3);
d=md4_gg(d,a,b,c,x[i+5],5);
c=md4_gg(c,d,a,b,x[i+9],9);
b=md4_gg(b,c,d,a,x[i+13],13);
a=md4_gg(a,b,c,d,x[i+2],3);
d=md4_gg(d,a,b,c,x[i+6],5);
c=md4_gg(c,d,a,b,x[i+10],9);
b=md4_gg(b,c,d,a,x[i+14],13);
a=md4_gg(a,b,c,d,x[i+3],3);
d=md4_gg(d,a,b,c,x[i+7],5);
c=md4_gg(c,d,a,b,x[i+11],9);
b=md4_gg(b,c,d,a,x[i+15],13);
a=md4_hh(a,b,c,d,x[i+0],3);
d=md4_hh(d,a,b,c,x[i+8],9);
c=md4_hh(c,d,a,b,x[i+4],11);
b=md4_hh(b,c,d,a,x[i+12],15);
a=md4_hh(a,b,c,d,x[i+2],3);
d=md4_hh(d,a,b,c,x[i+10],9);
c=md4_hh(c,d,a,b,x[i+6],11);
b=md4_hh(b,c,d,a,x[i+14],15);
a=md4_hh(a,b,c,d,x[i+1],3);
d=md4_hh(d,a,b,c,x[i+9],9);
c=md4_hh(c,d,a,b,x[i+5],11);
b=md4_hh(b,c,d,a,x[i+13],15);
a=md4_hh(a,b,c,d,x[i+3],3);
d=md4_hh(d,a,b,c,x[i+11],9);
c=md4_hh(c,d,a,b,x[i+7],11);
b=md4_hh(b,c,d,a,x[i+15],15);
a=safe_add(a,olda);
b=safe_add(b,oldb);
c=safe_add(c,oldc);
d=safe_add(d,oldd);
}
returnArray(a,b,c,d);
}
/*
*Thesefunctionsimplementthebasicoperationforeachroundofthe
*algorithm.
*/
functionmd4_cmn(q,a,b,x,s,t)
{
returnsafe_add(rol(safe_add(safe_add(a,q),safe_add(x,t)),s),b);
}
functionmd4_ff(a,b,c,d,x,s)
{
returnmd4_cmn((b&c)|((~b)&d),a,0,x,s,0);
}
functionmd4_gg(a,b,c,d,x,s)
{
returnmd4_cmn((b&c)|(b&d)|(c&d),a,0,x,s,1518500249);
}
functionmd4_hh(a,b,c,d,x,s)
{
returnmd4_cmn(b^c^d,a,0,x,s,1859775393);
}
/*
*CalculatetheHMAC-MD4,ofakeyandsomedata
*/
functioncore_hmac_md4(key,data)
{
varbkey=str2binl(key);
if(bkey.length>16)bkey=core_md4(bkey,key.length*chrsz);
varipad=Array(16),opad=Array(16);
for(vari=0;i<16;i++)
{
ipad[i]=bkey[i]^0x36363636;
opad[i]=bkey[i]^0x5C5C5C5C;
}
varhash=core_md4(ipad.concat(str2binl(data)),512+data.length*chrsz);
returncore_md4(opad.concat(hash),512+128);
}
/*
*Addintegers,wrappingat2^32.Thisuses16-bitoperationsinternally
*toworkaroundbugsinsomeJSinterpreters.
*/
functionsafe_add(x,y)
{
varlsw=(x&0xFFFF)+(y&0xFFFF);
varmsw=(x>>16)+(y>>16)+(lsw>>16);
return(msw<<16)|(lsw&0xFFFF);
}
/*
*Bitwiserotatea32-bitnumbertotheleft.
*/
functionrol(num,cnt)
{
return(num<<cnt)|(num>>>(32-cnt));
}
/*
*Convertastringtoanarrayoflittle-endianwords
*IfchrszisASCII,characters>255havetheirhi-bytesilentlyignored.
*/
functionstr2binl(str)
{
varbin=Array();
varmask=(1<<chrsz)-1;
for(vari=0;i<str.length*chrsz;i+=chrsz)
bin[i>>5]|=(str.charCodeAt(i/chrsz)&mask)<<(i%32);
returnbin;
}
/*
*Convertanarrayoflittle-endianwordstoastring
*/
functionbinl2str(bin)
{
varstr="";
varmask=(1<<chrsz)-1;
for(vari=0;i<bin.length*32;i+=chrsz)
str+=String.fromCharCode((bin[i>>5]>>>(i%32))&mask);
returnstr;
}
/*
*Convertanarrayoflittle-endianwordstoahexstring.
*/
functionbinl2hex(binarray)
{
varhex_tab=hexcase?"0123456789ABCDEF":"0123456789abcdef";
varstr="";
for(vari=0;i<binarray.length*4;i++)
{
str+=hex_tab.charAt((binarray[i>>2]>>((i%4)*8+4))&0xF)+
hex_tab.charAt((binarray[i>>2]>>((i%4)*8))&0xF);
}
returnstr;
}
/*
*Convertanarrayoflittle-endianwordstoabase-64string
*/
functionbinl2b64(binarray)
{
vartab="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
varstr="";
for(vari=0;i<binarray.length*4;i+=3)
{
vartriplet=(((binarray[i>>2]>>8*(i%4))&0xFF)<<16)
|(((binarray[i+1>>2]>>8*((i+1)%4))&0xFF)<<8)
|((binarray[i+2>>2]>>8*((i+2)%4))&0xFF);
for(varj=0;j<4;j++)
{
if(i*8+j*6>binarray.length*32)str+=b64pad;
elsestr+=tab.charAt((triplet>>6*(3-j))&0x3F);
}
}
returnstr;
}
SHA1算法
/*
*AJavaScriptimplementationoftheSecureHashAlgorithm,SHA-1,asdefined
*inFIPSPUB180-1
*Version2.1aCopyrightPaulJohnston2000-2002.
*Othercontributors:GregHolt,AndrewKepert,Ydnar,Lostinet
*DistributedundertheBSDLicense
*Seehttp://pajhome.org.uk/crypt/md5fordetails.
*/
/*
*Configurablevariables.Youmayneedtotweakthesetobecompatiblewith
*theserver-side,butthedefaultsworkinmostcases.
*/
varhexcase=0;/*hexoutputformat.0-lowercase;1-uppercase*/
varb64pad="";/*base-64padcharacter."="forstrictRFCcompliance*/
varchrsz=8;/*bitsperinputcharacter.8-ASCII;16-Unicode*/
/*
*Thesearethefunctionsyou'llusuallywanttocall
*Theytakestringargumentsandreturneitherhexorbase-64encodedstrings
*/
functionhex_sha1(s){returnbinb2hex(core_sha1(str2binb(s),s.length*chrsz));}
functionb64_sha1(s){returnbinb2b64(core_sha1(str2binb(s),s.length*chrsz));}
functionstr_sha1(s){returnbinb2str(core_sha1(str2binb(s),s.length*chrsz));}
functionhex_hmac_sha1(key,data){returnbinb2hex(core_hmac_sha1(key,data));}
functionb64_hmac_sha1(key,data){returnbinb2b64(core_hmac_sha1(key,data));}
functionstr_hmac_sha1(key,data){returnbinb2str(core_hmac_sha1(key,data));}
/*
*Performasimpleself-testtoseeiftheVMisworking
*/
functionsha1_vm_test()
{
returnhex_sha1("abc")=="a9993e364706816aba3e25717850c26c9cd0d89d";
}
/*
*CalculatetheSHA-1ofanarrayofbig-endianwords,andabitlength
*/
functioncore_sha1(x,len)
{
/*appendpadding*/
x[len>>5]|=0x80<<(24-len%32);
x[((len+64>>9)<<4)+15]=len;
varw=Array(80);
vara=1732584193;
varb=-271733879;
varc=-1732584194;
vard=271733878;
vare=-1009589776;
for(vari=0;i<x.length;i+=16)
{
varolda=a;
varoldb=b;
varoldc=c;
varoldd=d;
varolde=e;
for(varj=0;j<80;j++)
{
if(j<16)w[j]=x[i+j];
elsew[j]=rol(w[j-3]^w[j-8]^w[j-14]^w[j-16],1);
vart=safe_add(safe_add(rol(a,5),sha1_ft(j,b,c,d)),
safe_add(safe_add(e,w[j]),sha1_kt(j)));
e=d;
d=c;
c=rol(b,30);
b=a;
a=t;
}
a=safe_add(a,olda);
b=safe_add(b,oldb);
c=safe_add(c,oldc);
d=safe_add(d,oldd);
e=safe_add(e,olde);
}
returnArray(a,b,c,d,e);
}
/*
*Performtheappropriatetripletcombinationfunctionforthecurrent
*iteration
*/
functionsha1_ft(t,b,c,d)
{
if(t<20)return(b&c)|((~b)&d);
if(t<40)returnb^c^d;
if(t<60)return(b&c)|(b&d)|(c&d);
returnb^c^d;
}
/*
*Determinetheappropriateadditiveconstantforthecurrentiteration
*/
functionsha1_kt(t)
{
return(t<20)?1518500249:(t<40)?1859775393:
(t<60)?-1894007588:-899497514;
}
/*
*CalculatetheHMAC-SHA1ofakeyandsomedata
*/
functioncore_hmac_sha1(key,data)
{
varbkey=str2binb(key);
if(bkey.length>16)bkey=core_sha1(bkey,key.length*chrsz);
varipad=Array(16),opad=Array(16);
for(vari=0;i<16;i++)
{
ipad[i]=bkey[i]^0x36363636;
opad[i]=bkey[i]^0x5C5C5C5C;
}
varhash=core_sha1(ipad.concat(str2binb(data)),512+data.length*chrsz);
returncore_sha1(opad.concat(hash),512+160);
}
/*
*Addintegers,wrappingat2^32.Thisuses16-bitoperationsinternally
*toworkaroundbugsinsomeJSinterpreters.
*/
functionsafe_add(x,y)
{
varlsw=(x&0xFFFF)+(y&0xFFFF);
varmsw=(x>>16)+(y>>16)+(lsw>>16);
return(msw<<16)|(lsw&0xFFFF);
}
/*
*Bitwiserotatea32-bitnumbertotheleft.
*/
functionrol(num,cnt)
{
return(num<<cnt)|(num>>>(32-cnt));
}
/*
*Convertan8-bitor16-bitstringtoanarrayofbig-endianwords
*In8-bitfunction,characters>255havetheirhi-bytesilentlyignored.
*/
functionstr2binb(str)
{
varbin=Array();
varmask=(1<<chrsz)-1;
for(vari=0;i<str.length*chrsz;i+=chrsz)
bin[i>>5]|=(str.charCodeAt(i/chrsz)&mask)<<(32-chrsz-i%32);
returnbin;
}
/*
*Convertanarrayofbig-endianwordstoastring
*/
functionbinb2str(bin)
{
varstr="";
varmask=(1<<chrsz)-1;
for(vari=0;i<bin.length*32;i+=chrsz)
str+=String.fromCharCode((bin[i>>5]>>>(32-chrsz-i%32))&mask);
returnstr;
}
/*
*Convertanarrayofbig-endianwordstoahexstring.
*/
functionbinb2hex(binarray)
{
varhex_tab=hexcase?"0123456789ABCDEF":"0123456789abcdef";
varstr="";
for(vari=0;i<binarray.length*4;i++)
{
str+=hex_tab.charAt((binarray[i>>2]>>((3-i%4)*8+4))&0xF)+
hex_tab.charAt((binarray[i>>2]>>((3-i%4)*8))&0xF);
}
returnstr;
}
/*
*Convertanarrayofbig-endianwordstoabase-64string
*/
functionbinb2b64(binarray)
{
vartab="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
varstr="";
for(vari=0;i<binarray.length*4;i+=3)
{
vartriplet=(((binarray[i>>2]>>8*(3-i%4))&0xFF)<<16)
|(((binarray[i+1>>2]>>8*(3-(i+1)%4))&0xFF)<<8)
|((binarray[i+2>>2]>>8*(3-(i+2)%4))&0xFF);
for(varj=0;j<4;j++)
{
if(i*8+j*6>binarray.length*32)str+=b64pad;
elsestr+=tab.charAt((triplet>>6*(3-j))&0x3F);
}
}
returnstr;
}
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更多关于JavaScript相关内容可查看本站专题：《JavaScript加密解密技巧汇总》、《JavaScript切换特效与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》
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