bech32: refactor.

bench/bech32.js

@@ -9,16 +9,18 @@ var i, end, addr;
 var addrs = [];
 
 end = bench('serialize');
-for (i = 0; i < 10000; i++) {
+for (i = 0; i < 100000; i++) {
   addr = Address.fromProgram(0, crypto.randomBytes(20));
   addrs.push(addr.toBech32());
 }
 end(i);
 
 end = bench('parse');
-for (i = 0; i < 10000; i++) {
+for (i = 0; i < 100000; i++) {
   addr = addrs[i];
   addr = Address.fromBech32(addr);
   addrs[i] = addr;
 }
 end(i);
+
+console.error(addrs);

lib/primitives/address.js

@@ -236,9 +236,7 @@ Address.prototype.toBech32 = function toBech32(network) {
   network = Network.get(network);
   hrp = network.addressPrefix.bech32;
 
-  data = bech32.bitsify(hash, 65, 8, 5, version, 0);
-
-  return bech32.encode(hrp, data);
+  return bech32.encode(hrp, version, hash);
 };
 
 /**
@@ -389,23 +387,18 @@ Address.fromBase58 = function fromBase58(address, network) {
 /**
  * Inject properties from bech32 address.
  * @private
- * @param {String} data
+ * @param {String} str
  * @param {Network?} network
  * @throws Parse error
  */
 
-Address.prototype.fromBech32 = function fromBech32(data, network) {
+Address.prototype.fromBech32 = function fromBech32(str, network) {
   var type = Address.types.WITNESS;
-  var i, addr, hash, version;
+  var i, addr;
 
-  assert(typeof data === 'string');
+  assert(typeof str === 'string');
 
-  addr = bech32.decode(data);
-
-  if (addr.data.length < 1)
-    throw new Error('Invalid bech32 data length.');
-
-  version = addr.data[0];
+  addr = bech32.decode(str);
 
   if (network) {
     network = Network.get(network);
@@ -421,9 +414,7 @@ Address.prototype.fromBech32 = function fromBech32(data, network) {
     assert(i < networks.types.length, 'Unknown bech32 address prefix.');
   }
 
-  hash = bech32.bitsify(addr.data, 84, 5, 8, -1, 1);
-
-  return this.fromHash(hash, type, version, network.type);
+  return this.fromHash(addr.hash, type, addr.version, network.type);
 };
 
 /**

lib/utils/bech32.js

@@ -29,6 +29,8 @@
 
 'use strict';
 
+var native = require('./native').binding;
+
 /**
  * @module utils/bech32
  */
@@ -70,7 +72,7 @@ function polymod(pre) {
  * @returns {String}
  */
 
-function encode(hrp, data) {
+function serialize(hrp, data) {
   var str = '';
   var chk = 1;
   var i, ch;
@@ -124,7 +126,7 @@ function encode(hrp, data) {
  * @returns {Bech32Result}
  */
 
-function decode(str) {
+function deserialize(str) {
   var chk = 1;
   var lower = false;
   var upper = false;
@@ -211,7 +213,7 @@ function decode(str) {
  * @returns {Buffer}
  */
 
-function bitsify(data, size, frombits, tobits, pad, off) {
+function convert(data, size, frombits, tobits, pad, off) {
   var acc = 0;
   var bits = 0;
   var maxv = (1 << tobits) - 1;
@@ -248,6 +250,46 @@ function bitsify(data, size, frombits, tobits, pad, off) {
   return output.slice(0, j);
 }
 
+/**
+ * Serialize data to bech32 address.
+ * @param {String} hrp
+ * @param {Number} version
+ * @param {Buffer} hash
+ * @returns {String}
+ */
+
+function encode(hrp, version, hash) {
+  var data = convert(hash, 65, 8, 5, version, 0);
+  return serialize(hrp, data);
+}
+
+if (native && native.toBech32)
+  encode = native.toBech32;
+
+/**
+ * Deserialize data from bech32 address.
+ * @param {String} str
+ * @returns {Object}
+ */
+
+function decode(str) {
+  var result = deserialize(str);
+  var hrp = result.hrp;
+  var data = result.data;
+  var version, hash;
+
+  if (data.length < 1)
+    throw new Error('Invalid bech32 data length.');
+
+  version = data[0];
+  hash = convert(data, 84, 5, 8, -1, 1);
+
+  return new AddrResult(hrp, version, hash);
+}
+
+if (native && native.fromBech32)
+  decode = native.fromBech32;
+
 /**
  * Bech32Result
  * @constructor
@@ -263,10 +305,30 @@ function Bech32Result(hrp, data) {
   this.data = data;
 }
 
+/**
+ * AddrResult
+ * @constructor
+ * @private
+ * @param {String} hrp
+ * @param {Number} version
+ * @param {Buffer} hash
+ * @property {String} hrp
+ * @property {Number} version
+ * @property {Buffer} hash
+ */
+
+function AddrResult(hrp, version, hash) {
+  this.hrp = hrp;
+  this.version = version;
+  this.hash = hash;
+}
+
 /*
  * Expose
  */
 
-exports.decode = decode;
+exports.deserialize = deserialize;
+exports.serialize = serialize;
+exports.convert = convert;
 exports.encode = encode;
-exports.bitsify = bitsify;
+exports.decode = decode;

test/bech32-test.js

@@ -99,13 +99,13 @@ describe('Bech32', function() {
   ];
 
   function fromAddress(hrp, addr) {
-    var dec = bech32.decode(addr);
+    var dec = bech32.deserialize(addr);
     var data;
 
     if (dec.hrp !== hrp || dec.data.length < 1 || dec.data[0] > 16)
       throw new Error('Invalid bech32 prefix or data length.');
 
-    data = bech32.bitsify(dec.data, 84, 5, 8, -1, 1);
+    data = bech32.convert(dec.data, 84, 5, 8, -1, 1);
 
     if (data.length < 2 || data.length > 40)
       throw new Error('Invalid witness program size.');
@@ -120,8 +120,8 @@ describe('Bech32', function() {
   }
 
   function toAddress(hrp, version, program) {
-    var data = bech32.bitsify(program, 65, 8, 5, version, 0);
-    var ret = bech32.encode(hrp, data);
+    var data = bech32.convert(program, 65, 8, 5, version, 0);
+    var ret = bech32.serialize(hrp, data);
 
     fromAddress(hrp, ret);
 
@@ -135,7 +135,7 @@ describe('Bech32', function() {
 
   VALID_CHECKSUM.forEach(function(test) {
     it('should have valid checksum for ' + test, function() {
-      var ret = bech32.decode(test);
+      var ret = bech32.deserialize(test);
       assert(ret);
     });
   });