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bitcore-lib-zcash
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get-signature-count needed to measure txs with many inputs or outputs

This commit is contained in:
Gregg Zigler 2015-06-24 13:30:25 -04:00
parent 37b5d3d588
commit a4b8c06a2d
2 changed files with 72 additions and 0 deletions
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39
lib/script/script.js
View File

@ -838,4 +838,43 @@ Script.prototype.checkMinimalPush = function(i) {
return true;
};
/**
* Comes from bitcoind's script DecodOP_N function
* @param {number} opcode
* @returns {number} numeric value in range of -1 to 16
*/
Script.prototype._decodeOP_N = function(opcode) {
if (opcode === Opcode.OP_0)
return 0;
else if (opcode >= Opcode.OP_1 && opcode <= Opcode.OP_16)
return opcode - (Opcode.OP_1 - 1);
else
throw new Error('Invalid opcode: ' + JSON.stringify(opcode));
};
/**
* Comes from bitcoind's script GetSigOpCount(boolean) function
* @param {boolean} use current (true) or pre-version-0.6 (false) logic
* @returns {number} number of signature operations required by this script
*/
Script.prototype.getSignatureOperationsCount = function(fAccurate) {
var self = this;
var n = 0;
var lastOpcode = Opcode.OP_INVALIDOPCODE;
_.each(self.chunks, function getChunkOther(chunk) {
var opcode = chunk.opcodenum;
if (opcode == Opcode.OP_CHECKSIG || opcode == Opcode.OP_CHECKSIGVERIFY)
n++;
else if (opcode == Opcode.OP_CHECKMULTISIG ||
opcode == Opcode.OP_CHECKMULTISIGVERIFY) {
if (fAccurate && lastOpcode >= Opcode.OP_1 && lastOpcode <= Opcode.OP_16)
n += self._decodeOP_N(lastOpcode);
else
n += 20;
}
lastOpcode = opcode;
});
return n;
};
module.exports = Script;

33
test/script/script.js
View File

@ -775,5 +775,38 @@ describe('Script', function() {
});
});
describe('#getSignatureOperationsCount', function() {
// comes from bitcoind src/test/sigopcount_tests
// only test calls to function with boolean param, not signature ref param
it('should match bitcoind behavior', function() {
Script().getSignatureOperationsCount(false).should.equal(0);
Script().getSignatureOperationsCount(true).should.equal(0);
var s1 = 'OP_1 01 FF OP_2 OP_CHECKMULTISIG';
Script(s1).getSignatureOperationsCount(true).should.equal(2);
s1 += ' OP_IF OP_CHECKSIG OP_ENDIF';
Script(s1).getSignatureOperationsCount(true).should.equal(3);
Script(s1).getSignatureOperationsCount(false).should.equal(21);
// do not test BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig), 3U);
var pubkey_hexs = [
'022df8750480ad5b26950b25c7ba79d3e37d75f640f8e5d9bcd5b150a0f85014da',
'03e3818b65bcc73a7d64064106a859cc1a5a728c4345ff0b641209fba0d90de6e9',
'021f2f6e1e50cb6a953935c3601284925decd3fd21bc445712576873fb8c6ebc18',
];
var sortkeys = pubkey_hexs.slice(0, 3).map(PublicKey);
var s2 = Script.buildMultisigOut(sortkeys, 1);
Script(s2).getSignatureOperationsCount(true).should.equal(3);
Script(s2).getSignatureOperationsCount(false).should.equal(20);
// create a bogus, well-formed signature
var signature = bitcore.crypto.Signature.fromString('30060201FF0201FF');
var signatures = [ signature.toBuffer() ];
var p2sh = Script.buildP2SHMultisigIn(pubkey_hexs, 1, signatures, {});
p2sh.getSignatureOperationsCount(true).should.equal(0);
p2sh.getSignatureOperationsCount(false).should.equal(0);
// do not test BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig2), 3U);
});
});
});