54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
var bufferutils = require('./bufferutils')
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var crypto = require('./crypto')
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var ecdsa = require('./ecdsa')
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var networks = require('./networks')
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var BigInteger = require('bigi')
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var ECPubKey = require('./ecpubkey')
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var ECSignature = require('./ecsignature')
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var ecurve = require('ecurve')
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var ecparams = ecurve.getCurveByName('secp256k1')
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function magicHash(message, network) {
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var magicPrefix = new Buffer(network.magicPrefix)
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var messageBuffer = new Buffer(message)
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var lengthBuffer = bufferutils.varIntBuffer(messageBuffer.length)
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var buffer = Buffer.concat([magicPrefix, lengthBuffer, messageBuffer])
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return crypto.hash256(buffer)
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}
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function sign(privKey, message, network) {
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network = network || networks.bitcoin
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var hash = magicHash(message, network)
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var signature = privKey.sign(hash)
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var e = BigInteger.fromBuffer(hash)
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var i = ecdsa.calcPubKeyRecoveryParam(ecparams, e, signature, privKey.pub.Q)
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return signature.toCompact(i, privKey.pub.compressed)
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}
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// TODO: network could be implied from address
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function verify(address, signature, message, network) {
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if (!Buffer.isBuffer(signature)) {
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signature = new Buffer(signature, 'base64')
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}
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network = network || networks.bitcoin
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var hash = magicHash(message, network)
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var parsed = ECSignature.parseCompact(signature)
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var e = BigInteger.fromBuffer(hash)
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var Q = ecdsa.recoverPubKey(ecparams, e, parsed.signature, parsed.i)
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var pubKey = new ECPubKey(Q, parsed.compressed)
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return pubKey.getAddress(network).toString() === address.toString()
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}
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module.exports = {
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magicHash: magicHash,
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sign: sign,
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verify: verify
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}
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