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69 lines
1.7 KiB
69 lines
1.7 KiB
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 decode = base58check.decode(string)
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var payload = decode.payload
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var compressed = false
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if (payload.length === 33) {
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assert.strictEqual(payload[32], 0x01, 'Invalid 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(version) {
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version = version || networks.bitcoin.wif
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var buffer = this.D.toBuffer(32)
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if (this.pub.compressed) {
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buffer = Buffer.concat([buffer, new Buffer([0x01])])
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}
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return base58check.encode(buffer, version)
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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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