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Merge pull request #98 from symaxian/master

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Cleaning up message.js
This commit is contained in:
Kyle Drake 2014-03-27 13:59:29 -07:00
commit 275d5509dc
1 changed files with 41 additions and 44 deletions
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85
src/message.js
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@ -1,68 +1,65 @@
/// Implements Bitcoin's feature for signing arbitrary messages.
var SHA256 = require('crypto-js/sha256');
var ecdsa = require('./ecdsa');
var convert = require('./convert');
var SHA256 = require('crypto-js/sha256')
var ecdsa = require('./ecdsa')
var convert = require('./convert')
var Message = {};
var Message = {}
Message.magicPrefix = "Bitcoin Signed Message:\n";
Message.magicPrefix = "Bitcoin Signed Message:\n"
Message.makeMagicMessage = function (message) {
var magicBytes = convert.stringToBytes(Message.magicPrefix);
var messageBytes = convert.stringToBytes(message);
var magicBytes = convert.stringToBytes(Message.magicPrefix)
var messageBytes = convert.stringToBytes(message)
var buffer = [];
buffer = buffer.concat(convert.numToVarInt(magicBytes.length));
buffer = buffer.concat(magicBytes);
buffer = buffer.concat(convert.numToVarInt(messageBytes.length));
buffer = buffer.concat(messageBytes);
return [].concat(
convert.numToVarInt(magicBytes.length),
magicBytes,
convert.numToVarInt(messageBytes.length),
messageBytes
)
return buffer;
};
}
Message.getHash = function (message) {
var buffer = Message.makeMagicMessage(message);
return convert.wordArrayToBytes(SHA256(SHA256(convert.bytesToWordArray(buffer))));
};
var buffer = Message.makeMagicMessage(message)
return convert.wordArrayToBytes(SHA256(SHA256(convert.bytesToWordArray(buffer))))
}
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 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();
var rBa = obj.r.toByteArrayUnsigned()
var sBa = obj.s.toByteArrayUnsigned()
// Pad to 32 bytes per value
while (rBa.length < 32) rBa.unshift(0);
while (sBa.length < 32) sBa.unshift(0);
while (rBa.length < 32) rBa.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) {
sig = convert.hexToBytes(sig);
sig = ecdsa.parseSigCompact(sig);
sig = ecdsa.parseSigCompact(convert.hexToBytes(sig))
var hash = Message.getHash(message);
var hash = Message.getHash(message)
var isCompressed = !!(sig.i & 4);
var pubKey = ecdsa.recoverPubKey(sig.r, sig.s, hash, sig.i);
pubKey.compressed = isCompressed;
var isCompressed = !!(sig.i & 4)
var pubKey = ecdsa.recoverPubKey(sig.r, sig.s, hash, sig.i)
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