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Cleaning up message.js

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This commit is contained in:
Jonathon Reesor 2014-03-26 21:00:08 -04:00
parent 65fb593be2
commit 096f8c982e
1 changed files with 41 additions and 44 deletions

85
src/message.js
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@ -1,68 +1,65 @@
/// Implements Bitcoin's feature for signing arbitrary messages. /// Implements Bitcoin's feature for signing arbitrary messages.
var SHA256 = require('crypto-js/sha256'); var SHA256 = require('crypto-js/sha256')
var ecdsa = require('./ecdsa'); var ecdsa = require('./ecdsa')
var convert = require('./convert'); var convert = require('./convert')
var Message = {}; var Message = {}
Message.magicPrefix = "Bitcoin Signed Message:\n"; Message.magicPrefix = "Bitcoin Signed Message:\n"
Message.makeMagicMessage = function (message) { Message.makeMagicMessage = function (message) {
var magicBytes = convert.stringToBytes(Message.magicPrefix); var magicBytes = convert.stringToBytes(Message.magicPrefix)
var messageBytes = convert.stringToBytes(message); var messageBytes = convert.stringToBytes(message)
var buffer = []; return [].concat(
buffer = buffer.concat(convert.numToVarInt(magicBytes.length)); convert.numToVarInt(magicBytes.length),
buffer = buffer.concat(magicBytes); magicBytes,
buffer = buffer.concat(convert.numToVarInt(messageBytes.length)); convert.numToVarInt(messageBytes.length),
buffer = buffer.concat(messageBytes); messageBytes
)
return buffer; }
};
Message.getHash = function (message) { Message.getHash = function (message) {
var buffer = Message.makeMagicMessage(message); var buffer = Message.makeMagicMessage(message)
return convert.wordArrayToBytes(SHA256(SHA256(convert.bytesToWordArray(buffer)))); return convert.wordArrayToBytes(SHA256(SHA256(convert.bytesToWordArray(buffer))))
}; }
Message.signMessage = function (key, message) { Message.signMessage = function (key, message) {
var hash = Message.getHash(message); var hash = Message.getHash(message)
var sig = key.sign(hash)
var obj = ecdsa.parseSig(sig)
var i = ecdsa.calcPubkeyRecoveryParam(key, obj.r, obj.s, hash)
var sig = key.sign(hash); i += 27
if (key.compressed) {
i += 4
}
var obj = ecdsa.parseSig(sig); var rBa = obj.r.toByteArrayUnsigned()
var sBa = obj.s.toByteArrayUnsigned()
var i = ecdsa.calcPubkeyRecoveryParam(key, obj.r, obj.s, hash);
i += 27;
if (key.compressed) i += 4;
var rBa = obj.r.toByteArrayUnsigned();
var sBa = obj.s.toByteArrayUnsigned();
// Pad to 32 bytes per value // Pad to 32 bytes per value
while (rBa.length < 32) rBa.unshift(0); while (rBa.length < 32) rBa.unshift(0)
while (sBa.length < 32) sBa.unshift(0); while (sBa.length < 32) sBa.unshift(0)
sig = [i].concat(rBa).concat(sBa); sig = [i].concat(rBa, sBa)
return convert.bytesToHex(sig); return convert.bytesToHex(sig)
}; }
Message.verifyMessage = function (address, sig, message) { Message.verifyMessage = function (address, sig, message) {
sig = convert.hexToBytes(sig); sig = ecdsa.parseSigCompact(convert.hexToBytes(sig))
sig = ecdsa.parseSigCompact(sig);
var hash = Message.getHash(message); var hash = Message.getHash(message)
var isCompressed = !!(sig.i & 4); var isCompressed = !!(sig.i & 4)
var pubKey = ecdsa.recoverPubKey(sig.r, sig.s, hash, sig.i); var pubKey = ecdsa.recoverPubKey(sig.r, sig.s, hash, sig.i)
pubKey.compressed = isCompressed; pubKey.compressed = isCompressed
var expectedAddress = pubKey.getAddress().toString(); // Compare address to expected address
return address === pubKey.getAddress().toString()
}
return (address === expectedAddress); module.exports = Message
};
module.exports = Message;