95 lines
2.5 KiB
JavaScript
95 lines
2.5 KiB
JavaScript
var ECDSA = require('./ecdsa');
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var Keypair = require('./keypair');
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var Privkey = require('./privkey');
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var Pubkey = require('./pubkey');
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var BufferWriter = require('./bufferwriter');
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var Hash = require('./hash');
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var Address = require('./address');
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var Signature = require('./signature');
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var Message = function Message(obj) {
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if (!(this instanceof Message))
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return new Message(obj);
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if (obj)
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this.set(obj);
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};
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Message.prototype.set = function(obj) {
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this.messagebuf = obj.messagebuf || this.messagebuf;
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this.keypair = obj.keypair || this.keypair;
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this.sig = obj.sig || this.sig;
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this.address = obj.address || this.address;
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this.verified = typeof obj.verified !== 'undefined' ? obj.verified : this.verified;
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return this;
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};
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Message.magicBytes = new Buffer('Bitcoin Signed Message:\n');
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Message.magicHash = function(messagebuf) {
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if (!Buffer.isBuffer(messagebuf))
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throw new Error('messagebuf must be a buffer');
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var bw = new BufferWriter();
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bw.writeVarintNum(Message.magicBytes.length);
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bw.write(Message.magicBytes);
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bw.writeVarintNum(messagebuf.length);
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bw.write(messagebuf);
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var buf = bw.concat();
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var hashbuf = Hash.sha256sha256(buf);
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return hashbuf;
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};
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Message.sign = function(messagebuf, keypair) {
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var m = Message({messagebuf: messagebuf, keypair: keypair});
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m.sign();
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var sigbuf = m.sig.toCompact();
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var sigstr = sigbuf.toString('base64');
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return sigstr;
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};
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Message.verify = function(messagebuf, sigstr, address) {
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var sigbuf = new Buffer(sigstr, 'base64');
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var message = new Message();
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message.messagebuf = messagebuf;
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message.sig = Signature().fromCompact(sigbuf);
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message.address = address;
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return message.verify().verified;
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};
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Message.prototype.sign = function() {
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var hashbuf = Message.magicHash(this.messagebuf);
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var ecdsa = ECDSA({hashbuf: hashbuf, keypair: this.keypair});
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ecdsa.signRandomK();
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ecdsa.calci();
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this.sig = ecdsa.sig;
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return this;
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};
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Message.prototype.verify = function() {
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var hashbuf = Message.magicHash(this.messagebuf);
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var ecdsa = new ECDSA();
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ecdsa.hashbuf = hashbuf;
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ecdsa.sig = this.sig;
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ecdsa.keypair = new Keypair();
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ecdsa.keypair.pubkey = ecdsa.sig2pubkey();
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if (!ecdsa.verify()) {
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this.verified = false;
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return this;
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}
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var address = Address().fromPubkey(ecdsa.keypair.pubkey, undefined, this.sig.compressed);
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//TODO: what if livenet/testnet mismatch?
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if (address.hashbuf.toString('hex') === this.address.hashbuf.toString('hex'))
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this.verified = true;
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else
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this.verified = false;
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return this;
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};
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module.exports = Message;
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