JavaScript SHA-256加密算法详细代码
本文实例为大家分享了JavaScriptSHA-256加密算法，供大家参考，具体内容如下
/*
*AJavaScriptimplementationoftheSecureHashAlgorithm,SHA-256,asdefined
*inFIPS180-2
*Version2.2CopyrightAngelMarin,PaulJohnston2000-2009.
*Othercontributors:GregHolt,AndrewKepert,Ydnar,Lostinet
*DistributedundertheBSDLicense
*Seehttp://pajhome.org.uk/crypt/md5fordetails.
*Alsohttp://anmar.eu.org/projects/jssha2/
*/
/*
*Configurablevariables.Youmayneedtotweakthesetobecompatiblewith
*theserver-side,butthedefaultsworkinmostcases.
*/
varhexcase=0;/*hexoutputformat.0-lowercase;1-uppercase*/
varb64pad="";/*base-64padcharacter."="forstrictRFCcompliance*/
/*
*Thesearethefunctionsyou'llusuallywanttocall
*Theytakestringargumentsandreturneitherhexorbase-64encodedstrings
*/
functionhex_sha256(s){returnrstr2hex(rstr_sha256(str2rstr_utf8(s)));}
functionb64_sha256(s){returnrstr2b64(rstr_sha256(str2rstr_utf8(s)));}
functionany_sha256(s,e){returnrstr2any(rstr_sha256(str2rstr_utf8(s)),e);}
functionhex_hmac_sha256(k,d)
{returnrstr2hex(rstr_hmac_sha256(str2rstr_utf8(k),str2rstr_utf8(d)));}
functionb64_hmac_sha256(k,d)
{returnrstr2b64(rstr_hmac_sha256(str2rstr_utf8(k),str2rstr_utf8(d)));}
functionany_hmac_sha256(k,d,e)
{returnrstr2any(rstr_hmac_sha256(str2rstr_utf8(k),str2rstr_utf8(d)),e);}
/*
*Performasimpleself-testtoseeiftheVMisworking
*/
functionsha256_vm_test()
{
returnhex_sha256("abc").toLowerCase()==
"ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad";
}
/*
*Calculatethesha256ofarawstring
*/
functionrstr_sha256(s)
{
returnbinb2rstr(binb_sha256(rstr2binb(s),s.length*8));
}
/*
*CalculatetheHMAC-sha256ofakeyandsomedata(rawstrings)
*/
functionrstr_hmac_sha256(key,data)
{
varbkey=rstr2binb(key);
if(bkey.length>16)bkey=binb_sha256(bkey,key.length*8);
varipad=Array(16),opad=Array(16);
for(vari=0;i<16;i++)
{
ipad[i]=bkey[i]^0x36363636;
opad[i]=bkey[i]^0x5C5C5C5C;
}
varhash=binb_sha256(ipad.concat(rstr2binb(data)),512+data.length*8);
returnbinb2rstr(binb_sha256(opad.concat(hash),512+256));
}
/*
*Convertarawstringtoahexstring
*/
functionrstr2hex(input)
{
try{hexcase}catch(e){hexcase=0;}
varhex_tab=hexcase?"0123456789ABCDEF":"0123456789abcdef";
varoutput="";
varx;
for(vari=0;i<input.length;i++)
{
x=input.charCodeAt(i);
output+=hex_tab.charAt((x>>>4)&0x0F)
+hex_tab.charAt(x&0x0F);
}
returnoutput;
}
/*
*Convertarawstringtoabase-64string
*/
functionrstr2b64(input)
{
try{b64pad}catch(e){b64pad='';}
vartab="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
varoutput="";
varlen=input.length;
for(vari=0;i<len;i+=3)
{
vartriplet=(input.charCodeAt(i)<<16)
|(i+1<len?input.charCodeAt(i+1)<<8:0)
|(i+2<len?input.charCodeAt(i+2):0);
for(varj=0;j<4;j++)
{
if(i*8+j*6>input.length*8)output+=b64pad;
elseoutput+=tab.charAt((triplet>>>6*(3-j))&0x3F);
}
}
returnoutput;
}
/*
*Convertarawstringtoanarbitrarystringencoding
*/
functionrstr2any(input,encoding)
{
vardivisor=encoding.length;
varremainders=Array();
vari,q,x,quotient;
/*Converttoanarrayof16-bitbig-endianvalues,formingthedividend*/
vardividend=Array(Math.ceil(input.length/2));
for(i=0;i<dividend.length;i++)
{
dividend[i]=(input.charCodeAt(i*2)<<8)|input.charCodeAt(i*2+1);
}
/*
*Repeatedlyperformalongdivision.Thebinaryarrayformsthedividend,
*thelengthoftheencodingisthedivisor.Oncecomputed,thequotient
*formsthedividendforthenextstep.Westopwhenthedividendiszero.
*Allremaindersarestoredforlateruse.
*/
while(dividend.length>0)
{
quotient=Array();
x=0;
for(i=0;i<dividend.length;i++)
{
x=(x<<16)+dividend[i];
q=Math.floor(x/divisor);
x-=q*divisor;
if(quotient.length>0||q>0)
quotient[quotient.length]=q;
}
remainders[remainders.length]=x;
dividend=quotient;
}
/*Converttheremainderstotheoutputstring*/
varoutput="";
for(i=remainders.length-1;i>=0;i--)
output+=encoding.charAt(remainders[i]);
/*Appendleadingzeroequivalents*/
varfull_length=Math.ceil(input.length*8/
(Math.log(encoding.length)/Math.log(2)))
for(i=output.length;i<full_length;i++)
output=encoding[0]+output;
returnoutput;
}
/*
*Encodeastringasutf-8.
*Forefficiency,thisassumestheinputisvalidutf-16.
*/
functionstr2rstr_utf8(input)
{
varoutput="";
vari=-1;
varx,y;
while(++i<input.length)
{
/*Decodeutf-16surrogatepairs*/
x=input.charCodeAt(i);
y=i+1<input.length?input.charCodeAt(i+1):0;
if(0xD800<=x&&x<=0xDBFF&&0xDC00<=y&&y<=0xDFFF)
{
x=0x10000+((x&0x03FF)<<10)+(y&0x03FF);
i++;
}
/*Encodeoutputasutf-8*/
if(x<=0x7F)
output+=String.fromCharCode(x);
elseif(x<=0x7FF)
output+=String.fromCharCode(0xC0|((x>>>6)&0x1F),
0x80|(x&0x3F));
elseif(x<=0xFFFF)
output+=String.fromCharCode(0xE0|((x>>>12)&0x0F),
0x80|((x>>>6)&0x3F),
0x80|(x&0x3F));
elseif(x<=0x1FFFFF)
output+=String.fromCharCode(0xF0|((x>>>18)&0x07),
0x80|((x>>>12)&0x3F),
0x80|((x>>>6)&0x3F),
0x80|(x&0x3F));
}
returnoutput;
}
/*
*Encodeastringasutf-16
*/
functionstr2rstr_utf16le(input)
{
varoutput="";
for(vari=0;i<input.length;i++)
output+=String.fromCharCode(input.charCodeAt(i)&0xFF,
(input.charCodeAt(i)>>>8)&0xFF);
returnoutput;
}
functionstr2rstr_utf16be(input)
{
varoutput="";
for(vari=0;i<input.length;i++)
output+=String.fromCharCode((input.charCodeAt(i)>>>8)&0xFF,
input.charCodeAt(i)&0xFF);
returnoutput;
}
/*
*Convertarawstringtoanarrayofbig-endianwords
*Characters>255havetheirhigh-bytesilentlyignored.
*/
functionrstr2binb(input)
{
varoutput=Array(input.length>>2);
for(vari=0;i<output.length;i++)
output[i]=0;
for(vari=0;i<input.length*8;i+=8)
output[i>>5]|=(input.charCodeAt(i/8)&0xFF)<<(24-i%32);
returnoutput;
}
/*
*Convertanarrayofbig-endianwordstoastring
*/
functionbinb2rstr(input)
{
varoutput="";
for(vari=0;i<input.length*32;i+=8)
output+=String.fromCharCode((input[i>>5]>>>(24-i%32))&0xFF);
returnoutput;
}
/*
*Mainsha256function,withitssupportfunctions
*/
functionsha256_S(X,n){return(X>>>n)|(X<<(32-n));}
functionsha256_R(X,n){return(X>>>n);}
functionsha256_Ch(x,y,z){return((x&y)^((~x)&z));}
functionsha256_Maj(x,y,z){return((x&y)^(x&z)^(y&z));}
functionsha256_Sigma0256(x){return(sha256_S(x,2)^sha256_S(x,13)^sha256_S(x,22));}
functionsha256_Sigma1256(x){return(sha256_S(x,6)^sha256_S(x,11)^sha256_S(x,25));}
functionsha256_Gamma0256(x){return(sha256_S(x,7)^sha256_S(x,18)^sha256_R(x,3));}
functionsha256_Gamma1256(x){return(sha256_S(x,17)^sha256_S(x,19)^sha256_R(x,10));}
functionsha256_Sigma0512(x){return(sha256_S(x,28)^sha256_S(x,34)^sha256_S(x,39));}
functionsha256_Sigma1512(x){return(sha256_S(x,14)^sha256_S(x,18)^sha256_S(x,41));}
functionsha256_Gamma0512(x){return(sha256_S(x,1)^sha256_S(x,8)^sha256_R(x,7));}
functionsha256_Gamma1512(x){return(sha256_S(x,19)^sha256_S(x,61)^sha256_R(x,6));}
varsha256_K=newArray
(
1116352408,1899447441,-1245643825,-373957723,961987163,1508970993,
-1841331548,-1424204075,-670586216,310598401,607225278,1426881987,
1925078388,-2132889090,-1680079193,-1046744716,-459576895,-272742522,
264347078,604807628,770255983,1249150122,1555081692,1996064986,
-1740746414,-1473132947,-1341970488,-1084653625,-958395405,-710438585,
113926993,338241895,666307205,773529912,1294757372,1396182291,
1695183700,1986661051,-2117940946,-1838011259,-1564481375,-1474664885,
-1035236496,-949202525,-778901479,-694614492,-200395387,275423344,
430227734,506948616,659060556,883997877,958139571,1322822218,
1537002063,1747873779,1955562222,2024104815,-2067236844,-1933114872,
-1866530822,-1538233109,-1090935817,-965641998
);
functionbinb_sha256(m,l)
{
varHASH=newArray(1779033703,-1150833019,1013904242,-1521486534,
1359893119,-1694144372,528734635,1541459225);
varW=newArray(64);
vara,b,c,d,e,f,g,h;
vari,j,T1,T2;
/*appendpadding*/
m[l>>5]|=0x80<<(24-l%32);
m[((l+64>>9)<<4)+15]=l;
for(i=0;i<m.length;i+=16)
{
a=HASH[0];
b=HASH[1];
c=HASH[2];
d=HASH[3];
e=HASH[4];
f=HASH[5];
g=HASH[6];
h=HASH[7];
for(j=0;j<64;j++)
{
if(j<16)W[j]=m[j+i];
elseW[j]=safe_add(safe_add(safe_add(sha256_Gamma1256(W[j-2]),W[j-7]),
sha256_Gamma0256(W[j-15])),W[j-16]);
T1=safe_add(safe_add(safe_add(safe_add(h,sha256_Sigma1256(e)),sha256_Ch(e,f,g)),
sha256_K[j]),W[j]);
T2=safe_add(sha256_Sigma0256(a),sha256_Maj(a,b,c));
h=g;
g=f;
f=e;
e=safe_add(d,T1);
d=c;
c=b;
b=a;
a=safe_add(T1,T2);
}
HASH[0]=safe_add(a,HASH[0]);
HASH[1]=safe_add(b,HASH[1]);
HASH[2]=safe_add(c,HASH[2]);
HASH[3]=safe_add(d,HASH[3]);
HASH[4]=safe_add(e,HASH[4]);
HASH[5]=safe_add(f,HASH[5]);
HASH[6]=safe_add(g,HASH[6]);
HASH[7]=safe_add(h,HASH[7]);
}
returnHASH;
}
functionsafe_add(x,y)
{
varlsw=(x&0xFFFF)+(y&0xFFFF);
varmsw=(x>>16)+(y>>16)+(lsw>>16);
return(msw<<16)|(lsw&0xFFFF);
}
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