85 lines
2.5 KiB
JavaScript
85 lines
2.5 KiB
JavaScript
var assert = require('assert')
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var sec = require('../src/sec')
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var ecparams = sec('secp256k1')
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var BigInteger = require('bigi')
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var ECPointFp = require('../src/ec').ECPointFp
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var fixtures = require('./fixtures/ec.json')
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describe('ec', function() {
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describe('ECPointFp', function() {
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it('behaves correctly', function() {
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var G = ecparams.getG()
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var n = ecparams.getN()
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assert.ok(G.multiply(n).isInfinity(), "Gn is infinite")
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var k = BigInteger.ONE
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var P = G.multiply(k)
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assert.ok(!P.isInfinity(), "kG is not infinite")
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assert.ok(P.isOnCurve(), "kG on curve")
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assert.ok(P.multiply(n).isInfinity(), "kGn is infinite")
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assert.ok(P.validate(), "kG validates as a public key")
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})
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describe('getEncoded', function() {
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it('encodes a point correctly', function() {
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fixtures.valid.ECPointFp.forEach(function(f) {
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var curve = ecparams.getCurve()
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var Q = new ECPointFp(
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curve,
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curve.fromBigInteger(new BigInteger(f.x)),
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curve.fromBigInteger(new BigInteger(f.y))
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)
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var encoded = Q.getEncoded(f.compressed)
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assert.equal(encoded.toString('hex'), f.hex)
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})
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})
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})
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describe('decodeFrom', function() {
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it('decodes the correct point', function() {
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fixtures.valid.ECPointFp.forEach(function(f) {
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var curve = ecparams.getCurve()
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var buffer = new Buffer(f.hex, 'hex')
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var decoded = ECPointFp.decodeFrom(curve, buffer)
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assert.equal(decoded.Q.getX().toBigInteger().toString(), f.x)
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assert.equal(decoded.Q.getY().toBigInteger().toString(), f.y)
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assert.equal(decoded.compressed, f.compressed)
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})
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})
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fixtures.invalid.ECPointFp.forEach(function(f) {
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it('throws on ' + f.description, function() {
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var curve = ecparams.getCurve()
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var buffer = new Buffer(f.hex, 'hex')
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assert.throws(function() {
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ECPointFp.decodeFrom(curve, buffer)
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})
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})
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})
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it('supports other curves', function() {
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var f = fixtures.valid.ECPointFp[1]
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var ecparams2 = sec('secp256r1')
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var curve = ecparams2.getCurve()
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var D = BigInteger.ONE
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var Q = ecparams2.getG().multiply(D)
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var buffer = Q.getEncoded(true)
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var decoded = ECPointFp.decodeFrom(curve, buffer)
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assert(Q.equals(decoded.Q))
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assert(decoded.compressed, true)
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})
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})
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})
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})
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