get-signature-count needed to measure txs with many inputs or outputs
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@ -838,4 +838,43 @@ Script.prototype.checkMinimalPush = function(i) {
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return true;
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return true;
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};
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};
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/**
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* Comes from bitcoind's script DecodOP_N function
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* @param {number} opcode
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* @returns {number} numeric value in range of -1 to 16
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*/
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Script.prototype._decodeOP_N = function(opcode) {
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if (opcode === Opcode.OP_0)
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return 0;
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else if (opcode >= Opcode.OP_1 && opcode <= Opcode.OP_16)
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return opcode - (Opcode.OP_1 - 1);
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else
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throw new Error('Invalid opcode: ' + JSON.stringify(opcode));
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};
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/**
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* Comes from bitcoind's script GetSigOpCount(boolean) function
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* @param {boolean} use current (true) or pre-version-0.6 (false) logic
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* @returns {number} number of signature operations required by this script
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*/
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Script.prototype.getSignatureOperationsCount = function(fAccurate) {
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var self = this;
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var n = 0;
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var lastOpcode = Opcode.OP_INVALIDOPCODE;
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_.each(self.chunks, function getChunkOther(chunk) {
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var opcode = chunk.opcodenum;
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if (opcode == Opcode.OP_CHECKSIG || opcode == Opcode.OP_CHECKSIGVERIFY)
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n++;
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else if (opcode == Opcode.OP_CHECKMULTISIG ||
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opcode == Opcode.OP_CHECKMULTISIGVERIFY) {
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if (fAccurate && lastOpcode >= Opcode.OP_1 && lastOpcode <= Opcode.OP_16)
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n += self._decodeOP_N(lastOpcode);
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else
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n += 20;
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}
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lastOpcode = opcode;
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});
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return n;
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};
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module.exports = Script;
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module.exports = Script;
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@ -775,5 +775,38 @@ describe('Script', function() {
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});
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});
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});
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});
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describe('#getSignatureOperationsCount', function() {
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// comes from bitcoind src/test/sigopcount_tests
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// only test calls to function with boolean param, not signature ref param
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it('should match bitcoind behavior', function() {
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Script().getSignatureOperationsCount(false).should.equal(0);
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Script().getSignatureOperationsCount(true).should.equal(0);
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var s1 = 'OP_1 01 FF OP_2 OP_CHECKMULTISIG';
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Script(s1).getSignatureOperationsCount(true).should.equal(2);
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s1 += ' OP_IF OP_CHECKSIG OP_ENDIF';
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Script(s1).getSignatureOperationsCount(true).should.equal(3);
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Script(s1).getSignatureOperationsCount(false).should.equal(21);
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// do not test BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig), 3U);
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var pubkey_hexs = [
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'022df8750480ad5b26950b25c7ba79d3e37d75f640f8e5d9bcd5b150a0f85014da',
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'03e3818b65bcc73a7d64064106a859cc1a5a728c4345ff0b641209fba0d90de6e9',
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'021f2f6e1e50cb6a953935c3601284925decd3fd21bc445712576873fb8c6ebc18',
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];
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var sortkeys = pubkey_hexs.slice(0, 3).map(PublicKey);
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var s2 = Script.buildMultisigOut(sortkeys, 1);
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Script(s2).getSignatureOperationsCount(true).should.equal(3);
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Script(s2).getSignatureOperationsCount(false).should.equal(20);
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// create a bogus, well-formed signature
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var signature = bitcore.crypto.Signature.fromString('30060201FF0201FF');
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var signatures = [ signature.toBuffer() ];
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var p2sh = Script.buildP2SHMultisigIn(pubkey_hexs, 1, signatures, {});
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p2sh.getSignatureOperationsCount(true).should.equal(0);
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p2sh.getSignatureOperationsCount(false).should.equal(0);
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// do not test BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig2), 3U);
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});
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});
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});
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});
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