rm ECKey/ECPubKey
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84
src/eckey.js
84
src/eckey.js
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var assert = require('assert')
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var base58check = require('bs58check')
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var ecdsa = require('./ecdsa')
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var networks = require('./networks')
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var randomBytes = require('randombytes')
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var typeForce = require('typeforce')
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var BigInteger = require('bigi')
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var ECPubKey = require('./ecpubkey')
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var ecurve = require('ecurve')
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var secp256k1 = ecurve.getCurveByName('secp256k1')
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function ECKey (d, compressed) {
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assert(d.signum() > 0, 'Private key must be greater than 0')
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assert(d.compareTo(ECKey.curve.n) < 0, 'Private key must be less than the curve order')
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var Q = ECKey.curve.G.multiply(d)
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this.d = d
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this.pub = new ECPubKey(Q, compressed)
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}
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// Constants
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ECKey.curve = secp256k1
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// Static constructors
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ECKey.fromWIF = function (string) {
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var payload = base58check.decode(string)
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var compressed = false
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// Ignore the version byte
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payload = payload.slice(1)
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if (payload.length === 33) {
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assert.strictEqual(payload[32], 0x01, 'Invalid compression flag')
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// Truncate the compression flag
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payload = payload.slice(0, -1)
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compressed = true
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}
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assert.equal(payload.length, 32, 'Invalid WIF payload length')
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var d = BigInteger.fromBuffer(payload)
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return new ECKey(d, compressed)
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}
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ECKey.makeRandom = function (compressed, rng) {
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rng = rng || randomBytes
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var buffer = rng(32)
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typeForce('Buffer', buffer)
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assert.equal(buffer.length, 32, 'Expected 256-bit Buffer from RNG')
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var d = BigInteger.fromBuffer(buffer)
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d = d.mod(ECKey.curve.n)
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return new ECKey(d, compressed)
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}
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// Export functions
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ECKey.prototype.toWIF = function (network) {
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network = network || networks.bitcoin
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var bufferLen = this.pub.compressed ? 34 : 33
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var buffer = new Buffer(bufferLen)
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buffer.writeUInt8(network.wif, 0)
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this.d.toBuffer(32).copy(buffer, 1)
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if (this.pub.compressed) {
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buffer.writeUInt8(0x01, 33)
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}
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return base58check.encode(buffer)
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}
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// Operations
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ECKey.prototype.sign = function (hash) {
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return ecdsa.sign(ECKey.curve, hash, this.d)
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}
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module.exports = ECKey
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var crypto = require('./crypto')
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var ecdsa = require('./ecdsa')
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var typeForce = require('typeforce')
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var networks = require('./networks')
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var Address = require('./address')
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var ecurve = require('ecurve')
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var secp256k1 = ecurve.getCurveByName('secp256k1')
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function ECPubKey (Q, compressed) {
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if (compressed === undefined) {
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compressed = true
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}
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typeForce('Point', Q)
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typeForce('Boolean', compressed)
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this.compressed = compressed
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this.Q = Q
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}
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// Constants
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ECPubKey.curve = secp256k1
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// Static constructors
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ECPubKey.fromBuffer = function (buffer) {
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var Q = ecurve.Point.decodeFrom(ECPubKey.curve, buffer)
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return new ECPubKey(Q, Q.compressed)
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}
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ECPubKey.fromHex = function (hex) {
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return ECPubKey.fromBuffer(new Buffer(hex, 'hex'))
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}
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// Operations
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ECPubKey.prototype.getAddress = function (network) {
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network = network || networks.bitcoin
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return new Address(crypto.hash160(this.toBuffer()), network.pubKeyHash)
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}
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ECPubKey.prototype.verify = function (hash, signature) {
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return ecdsa.verify(ECPubKey.curve, hash, signature, this.Q)
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}
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// Export functions
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ECPubKey.prototype.toBuffer = function () {
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return this.Q.getEncoded(this.compressed)
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}
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ECPubKey.prototype.toHex = function () {
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return this.toBuffer().toString('hex')
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}
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module.exports = ECPubKey
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