78 lines
1.8 KiB
JavaScript
78 lines
1.8 KiB
JavaScript
var assert = require('assert')
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var base58check = require('./base58check')
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var ecdsa = require('./ecdsa')
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var networks = require('./networks')
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var secureRandom = require('secure-random')
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var BigInteger = require('bigi')
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var ECPubKey = require('./ecpubkey')
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var sec = require('./sec')
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var ecparams = sec('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(ecparams.getN()) < 0, 'Private key must be less than the curve order')
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var Q = ecparams.getG().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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// 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 || secureRandom
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var buffer = new Buffer(rng(32))
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var D = BigInteger.fromBuffer(buffer)
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D = D.mod(ecparams.getN())
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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(ecparams, hash, this.D)
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}
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module.exports = ECKey
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