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Fix #221: ecdsa-modified: fix bias and omission of zero in getBigRandom() #631

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Fix #221: ecdsa-modified: fix bias and omission of zero in getBigRandom() #631

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12 changes: 8 additions & 4 deletions src/ecdsa-modified-1.0.js
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Original file line number Diff line number Diff line change
Expand Up @@ -95,11 +95,15 @@ KJUR.crypto.ECDSA = function(params) {
//===========================
// PUBLIC METHODS
//===========================
/*
* Generate uniformly distributed big random integer in 0 <= x < limit
*/
this.getBigRandom = function (limit) {
return new _BigInteger(limit.bitLength(), rng)
.mod(limit.subtract(_BigInteger.ONE))
.add(_BigInteger.ONE)
;
var bitLength = limit.subtract(_BigInteger.ONE).bitLength();
do {
var result = new _BigInteger(bitLength, rng);
} while (result.compareTo(limit) >= 0);
return result;
};

this.setNamedCurve = function(curveName) {
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