dsa-2.0.min.js

/*! dsa-2.0.0.js (c) 2016 Kenji Urushimma | kjur.github.com/jsrsasign/license
 */
if(typeof KJUR=="undefined"||!KJUR){KJUR={}}if(typeof KJUR.crypto=="undefined"||!KJUR.crypto){KJUR.crypto={}}KJUR.crypto.DSA=function(){this.p=null;this.q=null;this.g=null;this.y=null;this.x=null;this.type="DSA";this.setPrivate=function(d,c,b,e,a){this.isPrivate=true;this.p=d;this.q=c;this.g=b;this.y=e;this.x=a};this.setPublic=function(c,b,a,d){this.isPublic=true;this.p=c;this.q=b;this.g=a;this.y=d;this.x=null};this.signWithMessageHash=function(d){var c=this.p;var b=this.q;var f=this.g;var i=this.y;var j=this.x;var e=KJUR.crypto.Util.getRandomBigIntegerMinToMax(BigInteger.ONE.add(BigInteger.ONE),b.subtract(BigInteger.ONE));var l=d.substr(0,b.bitLength()/4);var h=new BigInteger(l,16);var a=(f.modPow(e,c)).mod(b);var n=(e.modInverse(b).multiply(h.add(j.multiply(a)))).mod(b);var m=KJUR.asn1.ASN1Util.jsonToASN1HEX({seq:[{"int":{bigint:a}},{"int":{bigint:n}}]});return m};this.verifyWithMessageHash=function(h,f){var d=this.p;var b=this.q;var j=this.g;var l=this.y;var i=this.parseASN1Signature(f);var a=i[0];var t=i[1];var o=h.substr(0,b.bitLength()/4);var k=new BigInteger(o,16);if(BigInteger.ZERO.compareTo(a)>0||a.compareTo(b)>0){throw"invalid DSA signature"}if(BigInteger.ZERO.compareTo(t)>0||t.compareTo(b)>0){throw"invalid DSA signature"}var m=t.modInverse(b);var e=k.multiply(m).mod(b);var c=a.multiply(m).mod(b);var n=j.modPow(e,d).multiply(l.modPow(c,d)).mod(d).mod(b);return n.compareTo(a)==0};this.parseASN1Signature=function(a){try{var d=new BigInteger(ASN1HEX.getVbyList(a,0,[0],"02"),16);var c=new BigInteger(ASN1HEX.getVbyList(a,0,[1],"02"),16);return[d,c]}catch(b){throw"malformed ASN.1 DSA signature"}}};