136 lines
4.2 KiB
JavaScript
136 lines
4.2 KiB
JavaScript
/* global describe, it */
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var assert = require('assert')
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var bcrypto = require('../src/crypto')
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var ecdsa = require('../src/ecdsa')
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var sinon = require('sinon')
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var BigInteger = require('bigi')
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var ECSignature = require('../src/ecsignature')
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var curve = ecdsa.__curve
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var fixtures = require('./fixtures/ecdsa.json')
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describe('ecdsa', function () {
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describe('deterministicGenerateK', function () {
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function checkSig () {
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return true
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}
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fixtures.valid.ecdsa.forEach(function (f) {
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it('for "' + f.message + '"', function () {
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var x = BigInteger.fromHex(f.d).toBuffer(32)
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var h1 = bcrypto.sha256(f.message)
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var k = ecdsa.deterministicGenerateK(h1, x, checkSig)
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assert.strictEqual(k.toHex(), f.k)
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})
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})
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it('loops until an appropriate k value is found', sinon.test(function () {
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this.mock(BigInteger).expects('fromBuffer')
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.exactly(3)
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.onCall(0).returns(new BigInteger('0')) // < 1
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.onCall(1).returns(curve.n) // > n-1
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.onCall(2).returns(new BigInteger('42')) // valid
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var x = new BigInteger('1').toBuffer(32)
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var h1 = new Buffer(32)
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var k = ecdsa.deterministicGenerateK(h1, x, checkSig)
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assert.strictEqual(k.toString(), '42')
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}))
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it('loops until a suitable signature is found', sinon.test(function () {
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this.mock(BigInteger).expects('fromBuffer')
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.exactly(4)
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.onCall(0).returns(new BigInteger('0')) // < 1
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.onCall(1).returns(curve.n) // > n-1
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.onCall(2).returns(new BigInteger('42')) // valid, but 'bad' signature
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.onCall(3).returns(new BigInteger('53')) // valid, good signature
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var checkSig = this.mock()
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checkSig.exactly(2)
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checkSig.onCall(0).returns(false) // bad signature
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checkSig.onCall(1).returns(true) // good signature
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var x = new BigInteger('1').toBuffer(32)
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var h1 = new Buffer(32)
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var k = ecdsa.deterministicGenerateK(h1, x, checkSig)
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assert.strictEqual(k.toString(), '53')
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}))
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fixtures.valid.rfc6979.forEach(function (f) {
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it('produces the expected k values for ' + f.message + " if k wasn't suitable", function () {
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var x = BigInteger.fromHex(f.d).toBuffer(32)
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var h1 = bcrypto.sha256(f.message)
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var results = []
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ecdsa.deterministicGenerateK(h1, x, function (k) {
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results.push(k)
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return results.length === 16
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})
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assert.strictEqual(results[0].toHex(), f.k0)
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assert.strictEqual(results[1].toHex(), f.k1)
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assert.strictEqual(results[15].toHex(), f.k15)
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})
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})
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})
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describe('sign', function () {
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fixtures.valid.ecdsa.forEach(function (f) {
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it('produces a deterministic signature for "' + f.message + '"', function () {
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var d = BigInteger.fromHex(f.d)
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var hash = bcrypto.sha256(f.message)
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var signature = ecdsa.sign(hash, d).toDER()
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assert.strictEqual(signature.toString('hex'), f.signature)
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})
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})
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it('should sign with low S value', function () {
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var hash = bcrypto.sha256('Vires in numeris')
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var sig = ecdsa.sign(hash, BigInteger.ONE)
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// See BIP62 for more information
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var N_OVER_TWO = curve.n.shiftRight(1)
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assert(sig.s.compareTo(N_OVER_TWO) <= 0)
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})
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})
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describe('verify', function () {
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fixtures.valid.ecdsa.forEach(function (f) {
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it('verifies a valid signature for "' + f.message + '"', function () {
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var d = BigInteger.fromHex(f.d)
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var H = bcrypto.sha256(f.message)
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var signature = ECSignature.fromDER(new Buffer(f.signature, 'hex'))
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var Q = curve.G.multiply(d)
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assert(ecdsa.verify(H, signature, Q))
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})
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})
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fixtures.invalid.verify.forEach(function (f) {
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it('fails to verify with ' + f.description, function () {
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var H = bcrypto.sha256(f.message)
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var d = BigInteger.fromHex(f.d)
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var signature
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if (f.signature) {
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signature = ECSignature.fromDER(new Buffer(f.signature, 'hex'))
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} else if (f.signatureRaw) {
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signature = new ECSignature(new BigInteger(f.signatureRaw.r, 16), new BigInteger(f.signatureRaw.s, 16))
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}
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var Q = curve.G.multiply(d)
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assert.strictEqual(ecdsa.verify(H, signature, Q), false)
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})
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})
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})
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})
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