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script: optimize fromPubkeyhash and fromScripthash.

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Christopher Jeffrey 2016-11-17 04:53:10 -08:00
parent 44483a0549
commit d3da8bbfb8
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GPG Key ID: 8962AB9DE6666BBD
2 changed files with 73 additions and 10 deletions
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43
bench/script.js Normal file
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@ -0,0 +1,43 @@
'use strict';
var BN = require('bn.js');
var bcoin = require('../').set('main');
var constants = bcoin.constants;
var utils = bcoin.utils;
var assert = require('assert');
var scriptTypes = constants.scriptTypes;
var opcodes = constants.opcodes;
var bench = require('./bench');
var fs = require('fs');
var Script = bcoin.script;
bcoin.cache();
Script.prototype.fromPubkeyhashOld = function fromScripthash(hash) {
assert(Buffer.isBuffer(hash) && hash.length === 20);
this.push(opcodes.OP_DUP);
this.push(opcodes.OP_HASH160);
this.push(hash);
this.push(opcodes.OP_EQUALVERIFY);
this.push(opcodes.OP_CHECKSIG);
this.compile();
return this;
};
Script.fromPubkeyhashOld = function fromScripthash(hash) {
return new Script().fromPubkeyhashOld(hash);
};
var hashes = [];
for (var i = 0; i < 100000; i++)
hashes.push(bcoin.crypto.randomBytes(20));
var end = bench('old');
for (var i = 0; i < hashes.length; i++)
Script.fromPubkeyhashOld(hashes[i]);
end(i);
var end = bench('hash');
for (var i = 0; i < hashes.length; i++)
Script.fromPubkeyhash(hashes[i]);
end(i);

40
lib/script/script.js
View File

@ -1611,12 +1611,23 @@ Script.fromPubkey = function fromPubkey(key) {
Script.prototype.fromPubkeyhash = function fromPubkeyhash(hash) {
assert(Buffer.isBuffer(hash) && hash.length === 20);
this.push(opcodes.OP_DUP);
this.push(opcodes.OP_HASH160);
this.push(hash);
this.push(opcodes.OP_EQUALVERIFY);
this.push(opcodes.OP_CHECKSIG);
this.compile();
this.raw = new Buffer(25);
this.raw[0] = opcodes.OP_DUP;
this.raw[1] = opcodes.OP_HASH160;
this.raw[2] = 0x14;
hash.copy(this.raw, 3);
this.raw[23] = opcodes.OP_EQUALVERIFY;
this.raw[24] = opcodes.OP_CHECKSIG;
hash = this.raw.slice(3, 23);
this.code.push(new Opcode(opcodes.OP_DUP));
this.code.push(new Opcode(opcodes.OP_HASH160));
this.code.push(new Opcode(0x14, hash));
this.code.push(new Opcode(opcodes.OP_EQUALVERIFY));
this.code.push(new Opcode(opcodes.OP_CHECKSIG));
return this;
};
@ -1682,10 +1693,19 @@ Script.fromMultisig = function fromMultisig(m, n, keys) {
Script.prototype.fromScripthash = function fromScripthash(hash) {
assert(Buffer.isBuffer(hash) && hash.length === 20);
this.push(opcodes.OP_HASH160);
this.push(hash);
this.push(opcodes.OP_EQUAL);
this.compile();
this.raw = new Buffer(23);
this.raw[0] = opcodes.OP_HASH160;
this.raw[1] = 0x14;
hash.copy(this.raw, 2);
this.raw[22] = opcodes.OP_EQUAL;
hash = this.raw.slice(2, 22);
this.code.push(new Opcode(opcodes.OP_HASH160));
this.code.push(new Opcode(0x14, hash));
this.code.push(new Opcode(opcodes.OP_EQUAL));
return this;
};