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ECKey: fix modulo bias in makeRandom

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This commit is contained in:
Daniel Cousens 2015-08-21 16:56:11 +10:00
parent d50d49bd29
commit b89c82b9a6
1 changed files with 8 additions and 5 deletions
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13
src/eckey.js
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@ -49,12 +49,15 @@ ECKey.fromWIF = function (string) {
ECKey.makeRandom = function (compressed, rng) { ECKey.makeRandom = function (compressed, rng) {
rng = rng || randomBytes rng = rng || randomBytes
var buffer = rng(32) var d
typeForce('Buffer', buffer)
assert.equal(buffer.length, 32, 'Expected 256-bit Buffer from RNG')
var d = BigInteger.fromBuffer(buffer) do {
d = d.mod(ECKey.curve.n) var buffer = rng(32)
typeForce('Buffer', buffer)
assert.equal(buffer.length, 32, 'Expected 256-bit Buffer from RNG')
d = BigInteger.fromBuffer(buffer)
} while (d.compareTo(ECKey.curve) >= 0)
return new ECKey(d, compressed) return new ECKey(d, compressed)
} }