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Adds assertion messages

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This commit is contained in:
Daniel Cousens 2014-04-26 02:37:48 +10:00
parent c3e9d568c5
commit 89cf731ac7
1 changed files with 10 additions and 10 deletions
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20
src/ecdsa.js
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@ -40,12 +40,11 @@ var ecdsa = {
return crypto.createHmac('sha256', secret).update(buffer).digest()
}
assert(Buffer.isBuffer(hash))
assert.equal(hash.length, 32)
assert(Buffer.isBuffer(hash), 'Hash must be a Buffer')
assert.equal(hash.length, 32, 'Hash must be 256 bit')
assert(D instanceof BigInteger, 'Private key must be a BigInteger')
assert(D instanceof BigInteger)
var x = D.toBuffer(32)
var k = new Buffer(32)
var v = new Buffer(32)
k.fill(0)
@ -58,11 +57,12 @@ var ecdsa = {
v = HmacSHA256(v, k)
v = HmacSHA256(v, k)
var kBN = BigInteger.fromBuffer(v)
assert(kBN.compareTo(BigInteger.ONE) > 0)
assert(kBN.compareTo(ecparams.getN()) < 0)
var n = ecparams.getN()
var kB = BigInteger.fromBuffer(v).mod(n)
assert(kB.compareTo(BigInteger.ONE) > 0, 'Invalid k value')
assert(kB.compareTo(ecparams.getN()) < 0, 'Invalid k value')
return kBN
return kB
},
sign: function (hash, D) {
@ -74,10 +74,10 @@ var ecdsa = {
var e = BigInteger.fromBuffer(hash)
var r = Q.getX().toBigInteger().mod(n)
assert.notEqual(r.signum(), 0)
assert.notEqual(r.signum(), 0, 'Invalid R value')
var s = k.modInverse(n).multiply(e.add(D.multiply(r))).mod(n)
assert.notEqual(s.signum(), 0)
assert.notEqual(s.signum(), 0, 'Invalid S value')
var N_OVER_TWO = n.divide(BigInteger.valueOf(2))