659dc10f96
This adds a new Message class with static methods for signing and verifying a message the same way as bitcoind. (In a nutshell, messages a prepended with "Bitcoin Signed Message:" before being hashed and signed). There is one important piece missing ... verifying a signature with an address, and not a public key. I have not yet implemented this because the cryptography interface of bitcore does not allow me to derive the public key from a signature. This will need to be added before verifying from an address is possible.
43 lines
1.0 KiB
JavaScript
43 lines
1.0 KiB
JavaScript
'use strict';
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var imports = require('soop').imports();
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var coinUtil = imports.coinUtil || require('../util');
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var Key = imports.Key || require('./Key');
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var Message = function() {
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};
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Message.sign = function(str, key) {
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var hash = Message.magicHash(str);
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var sig = key.signSync(hash);
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return sig;
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};
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Message.verifyWithPubKey = function(pubkey, message, sig) {
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var hash = Message.magicHash(message);
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var key = new Key();
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if (pubkey.length == 65)
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key.compressed = false;
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key.public = pubkey;
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return key.verifySignatureSync(hash, sig);
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};
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//TODO: Message.verify ... with address, not pubkey
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Message.magicBytes = new Buffer('Bitcoin Signed Message:\n');
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Message.magicHash = function(str) {
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var magicBytes = Message.magicBytes;
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var prefix1 = coinUtil.varIntBuf(magicBytes.length);
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var message = new Buffer(str);
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var prefix2 = coinUtil.varIntBuf(message.length);
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var buf = Buffer.concat([prefix1, magicBytes, prefix2, message]);
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var hash = coinUtil.twoSha256(buf);
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return hash;
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};
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module.exports = require('soop')(Message);
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