74 lines
1.8 KiB
JavaScript
74 lines
1.8 KiB
JavaScript
var Key = require('bindings')('KeyModule').Key;
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var CommonKey = require('./common/Key');
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var bignum = require('bignum');
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var Point = require('./Point');
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var coinUtil = require('../util');
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for (var i in CommonKey) {
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if (CommonKey.hasOwnProperty(i))
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Key[i] = CommonKey[i];
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}
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Key.sign = function(hash, priv, k) {
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if (k)
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throw new Error('Deterministic k not supported in node');
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var key = new Key();
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key.private = priv.toBuffer({size: 32});
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var sig = key.signSync(hash);
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var parsed = Key.parseDERsig(sig);
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return {r: parsed.r, s: parsed.s};
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};
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Key.signCompressed = function(hash, priv, k) {
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var sig = Key.sign(hash, priv, k);
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var r = sig.r;
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var s = sig.s;
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var e = bignum.fromBuffer(hash);
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var G = Point.getG();
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var Q = Point.multiply(G, priv.toBuffer({size: 32}));
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var i = Key.calcPubKeyRecoveryParam(e, r, s, Q);
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var rbuf = r.toBuffer({size: 32});
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var sbuf = s.toBuffer({size: 32});
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var ibuf = new Buffer([i]);
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var buf = Buffer.concat([ibuf, rbuf, sbuf]);
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return buf;
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};
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Key.verifyCompressed = function(hash, sigbuf, pubkeyhash) {
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if (sigbuf.length !== 1 + 32 + 32)
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throw new Error("Invalid length for sigbuf");
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var i = sigbuf[0];
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if (i < 0 || i > 3)
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throw new Error("Invalid value for i");
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var rbuf = sigbuf.slice(1, 1 + 32);
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var sbuf = sigbuf.slice(1 + 32, 1 + 32 + 32);
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var r = bignum.fromBuffer(rbuf);
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var s = bignum.fromBuffer(sbuf);
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var sigDER = Key.rs2DER(r, s);
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var e = bignum.fromBuffer(hash);
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var key = new Key();
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var pub = Key.recoverPubKey(e, r, s, i);
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var pubbuf = pub.toCompressedPubKey();
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key.public = pubbuf;
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var pubkeyhash2 = coinUtil.sha256ripe160(pubbuf);
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if (pubkeyhash2.toString('hex') !== pubkeyhash.toString('hex')) {
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return false;
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}
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return key.verifySignatureSync(hash, sigDER);
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};
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module.exports = Key;
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