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57 lines
1.6 KiB
57 lines
1.6 KiB
var bufferutils = require('./bufferutils')
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var bcrypto = 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 ECPair = require('./ecpair')
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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 messagePrefix = new Buffer(network.messagePrefix)
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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([messagePrefix, lengthBuffer, messageBuffer])
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return bcrypto.hash256(buffer)
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}
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function sign (keyPair, 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 = keyPair.sign(hash)
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var e = BigInteger.fromBuffer(hash)
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var i = ecdsa.calcPubKeyRecoveryParam(ecparams, e, signature, keyPair.Q)
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return signature.toCompact(i, keyPair.compressed)
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}
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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 keyPair = new ECPair(null, Q, {
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compressed: parsed.compressed,
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network: network
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})
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return keyPair.getAddress() === address
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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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