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JS: Crypto: Fix ECDSA DER signature encoding.

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This commit is contained in:
Stefan Thomas
2013-02-08 02:38:15 +01:00
parent 75ade94f1c
commit dd43969183
1 changed files with 11 additions and 5 deletions
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16
src/js/sjcl-custom/sjcl-ecdsa-der.js
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@@ -5,12 +5,18 @@ sjcl.ecc.ecdsa.secretKey.prototype.signDER = function(hash, paranoia) {
sjcl.ecc.ecdsa.secretKey.prototype.encodeDER = function(rs) {
var w = sjcl.bitArray,
R = this._curve.r,
l = R.bitLength(),
r = sjcl.bn.fromBits(w.bitSlice(rs,0,l)).toBits(),
s = sjcl.bn.fromBits(w.bitSlice(rs,l,2*l)).toBits();
l = R.bitLength();
var rb = sjcl.codec.bytes.fromBits(r),
sb = sjcl.codec.bytes.fromBits(s);
var rb = sjcl.codec.bytes.fromBits(w.bitSlice(rs,0,l)),
sb = sjcl.codec.bytes.fromBits(w.bitSlice(rs,l,2*l));
// Drop empty leading bytes
while (!rb[0] && rb.length) rb.shift();
while (!sb[0] && sb.length) sb.shift();
// If high bit is set, prepend an extra zero byte (DER signed integer)
if (rb[0] & 0x80) rb.unshift(0);
if (sb[0] & 0x80) sb.unshift(0);
var buffer = [].concat(
0x30,