Transaction#hash.

src/js/ripple/serializedobject.js

@@ -216,13 +216,16 @@ SerializedObject.prototype.serialize = function (typedef, obj) {
   }
 };
 
-SerializedObject.prototype.signing_hash = function (prefix) {
+SerializedObject.prototype.hash = function (prefix) {
   var sign_buffer = new SerializedObject();
   stypes.Int32.serialize(sign_buffer, prefix);
   sign_buffer.append(this.buffer);
   return sign_buffer.hash_sha512_half();
 };
 
+// DEPRECATED
+SerializedObject.prototype.signing_hash = SerializedObject.prototype.hash;
+
 SerializedObject.prototype.hash_sha512_half = function () {
   var bits = sjcl.codec.bytes.toBits(this.buffer);
   var hash = sjcl.bitArray.bitSlice(sjcl.hash.sha512.hash(bits), 0, 256);

src/js/ripple/transaction.js

@@ -71,8 +71,6 @@ function Transaction(remote) {
   // Transaction data.
   this.tx_json                = { Flags: 0 };
 
-  this.hash                   = void(0);
-
   // ledger_current_index was this when transaction was submited.
   this.submit_index           = void(0);
 
@@ -122,8 +120,12 @@ Transaction.flags = {
 
 Transaction.formats = require('./binformat').tx;
 
-Transaction.HASH_SIGN         = 0x53545800;
-Transaction.HASH_SIGN_TESTNET = 0x73747800;
+// transaction plus signature to give transaction ID
+Transaction.HASH_TXID         = 0x54584E00; // 'TXN'
+// inner transaction to sign
+Transaction.HASH_SIGN         = 0x53545800; // 'STX'
+// inner transaction to sign (TESTNET)
+Transaction.HASH_SIGN_TESTNET = 0x73747800; // 'stx'
 
 Transaction.prototype.consts = {
   telLOCAL_ERROR  : -399,
@@ -134,6 +136,10 @@ Transaction.prototype.consts = {
   tecCLAIMED      : 100,
 };
 
+Transaction.from_json = function (j) {
+  return (new Transaction()).parse_json(j);
+};
+
 Transaction.prototype.isTelLocal = function (ter) {
   return ter >= this.consts.telLOCAL_ERROR && ter < this.consts.temMALFORMED;
 };
@@ -206,8 +212,21 @@ Transaction.prototype.serialize = function () {
 };
 
 Transaction.prototype.signing_hash = function () {
-  var prefix = Transaction[config.testnet ? 'HASH_SIGN_TESTNET' : 'HASH_SIGN'];
-  return SerializedObject.from_json(this.tx_json).signing_hash(prefix);
+  return this.hash(config.testnet ? 'HASH_SIGN_TESTNET' : 'HASH_SIGN');
+};
+
+Transaction.prototype.hash = function (prefix, as_uint256) {
+  if ("string" === typeof prefix) {
+    if ("undefined" === typeof Transaction[prefix]) {
+      throw new Error("Unknown hashing prefix requested.");
+    }
+    prefix = Transaction[prefix];
+  } else if (!prefix) {
+    prefix = Transaction['HASH_TXID'];
+  }
+  var hash = SerializedObject.from_json(this.tx_json).hash(prefix);
+
+  return as_uint256 ? hash : hash.to_hex();
 };
 
 Transaction.prototype.sign = function () {
@@ -650,6 +669,12 @@ Transaction.prototype.abort = function(callback) {
   }
 };
 
+Transaction.prototype.parse_json = function (v) {
+  this.tx_json = v;
+
+  return this;
+};
+
 exports.Transaction = Transaction;
 
 // vim:sw=2:sts=2:ts=8:et

test/transaction-test.js

@@ -0,0 +1,58 @@
+var utils            = require('./testutils');
+var assert           = require('assert');
+var Transaction = utils.load_module('transaction').Transaction;
+
+describe('Transaction', function() {
+  it('Hashing', function() {
+    var input_json = {
+      Account : "r4qLSAzv4LZ9TLsR7diphGwKnSEAMQTSjS",
+      Amount : {
+        currency : "LTC",
+        issuer : "r4qLSAzv4LZ9TLsR7diphGwKnSEAMQTSjS",
+        value : "9.985"
+      },
+      Destination : "r4qLSAzv4LZ9TLsR7diphGwKnSEAMQTSjS",
+      Fee : "15",
+      Flags : 0,
+      Paths : [
+        [
+          {
+            account : "rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q",
+            currency : "USD",
+            issuer : "rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q",
+            type : 49,
+            type_hex : "0000000000000031"
+          },
+          {
+            currency : "LTC",
+            issuer : "rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX",
+            type : 48,
+            type_hex : "0000000000000030"
+          },
+          {
+            account : "rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX",
+            currency : "LTC",
+            issuer : "rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX",
+            type : 49,
+            type_hex : "0000000000000031"
+          }
+        ]
+      ],
+      SendMax : {
+        currency : "USD",
+        issuer : "r4qLSAzv4LZ9TLsR7diphGwKnSEAMQTSjS",
+        value : "30.30993068"
+      },
+      Sequence : 415,
+      SigningPubKey : "02854B06CE8F3E65323F89260E9E19B33DA3E01B30EA4CA172612DE77973FAC58A",
+      TransactionType : "Payment",
+      TxnSignature : "304602210096C2F385530587DE573936CA51CB86B801A28F777C944E268212BE7341440B7F022100EBF0508A9145A56CDA7FAF314DF3BBE51C6EE450BA7E74D88516891A3608644E"
+    };
+    var expected_hash = "87366146D381AD971B97DD41CFAC1AE4670B0E996AB574B0CE18CE6467811868";
+    var transaction = Transaction.from_json(input_json);
+
+    assert.deepEqual(transaction.hash(), expected_hash);
+  });
+});
+
+// vim:sw=2:sts=2:ts=8:et