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JS: Override SJCL ECDSA with a standards-compliant version.

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This commit is contained in:
Stefan Thomas
2013-02-08 02:37:38 +01:00
parent aaad2f6edb
commit 1af930fbd1
2 changed files with 31 additions and 0 deletions
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1
grunt.js
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@@ -36,6 +36,7 @@ module.exports = function(grunt) {
"src/js/sjcl-custom/sjcl-secp256k1.js",
"src/js/sjcl-custom/sjcl-ripemd160.js",
"src/js/sjcl-custom/sjcl-extramath.js",
"src/js/sjcl-custom/sjcl-validecc.js",
"src/js/sjcl-custom/sjcl-ecdsa-der.js"
],
dest: 'build/sjcl.js'

30
src/js/sjcl-custom/sjcl-validecc.js Normal file
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@@ -0,0 +1,30 @@
sjcl.ecc.ecdsa.secretKey.prototype = {
sign: function(hash, paranoia) {
var R = this._curve.r,
l = R.bitLength(),
k = sjcl.bn.random(R.sub(1), paranoia).add(1),
r = this._curve.G.mult(k).x.mod(R),
s = sjcl.bn.fromBits(hash).add(r.mul(this._exponent)).mul(k.inverseMod(R)).mod(R);
return sjcl.bitArray.concat(r.toBits(l), s.toBits(l));
}
};
sjcl.ecc.ecdsa.publicKey.prototype = {
verify: function(hash, rs) {
var w = sjcl.bitArray,
R = this._curve.r,
l = R.bitLength(),
r = sjcl.bn.fromBits(w.bitSlice(rs,0,l)),
s = sjcl.bn.fromBits(w.bitSlice(rs,l,2*l)),
sInv = s.modInverse(R),
hG = sjcl.bn.fromBits(hash).mul(sInv).mod(R),
hA = r.mul(sInv).mod(R),
r2 = this._curve.G.mult2(hG, hA, this._point).x;
if (r.equals(0) || s.equals(0) || r.greaterEquals(R) || s.greaterEquals(R) || !r2.equals(r)) {
throw (new sjcl.exception.corrupt("signature didn't check out"));
}
return true;
}
};