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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