Merge pull request #777 from maraoz/add/tx_invalid/tests

add tx_invalid.json tests

lib/block.js

@@ -29,6 +29,9 @@ function Block(arg) {
   return this;
 }
 
+// https://github.com/bitcoin/bitcoin/blob/b5fa132329f0377d787a4a21c1686609c2bfaece/src/primitives/block.h#L14
+Block.MAX_BLOCK_SIZE = 1000000;
+
 /**
  * @param {*} - A Buffer, JSON string or Object
  * @returns {Object} - An object representing block data

lib/script/interpreter.js

@@ -889,7 +889,7 @@ ScriptInterpreter.prototype.step = function() {
           try {
             var sig = Signature.fromTxFormat(bufSig);
             var pubkey = PublicKey.fromBuffer(bufPubkey, false);
-            fSuccess = this.tx.verify(sig, pubkey, this.nin, subscript);
+            fSuccess = this.tx.verifySignature(sig, pubkey, this.nin, subscript);
           } catch (e) {
             //invalid sig or pubkey
             fSuccess = false;
@@ -978,7 +978,7 @@ ScriptInterpreter.prototype.step = function() {
             try {
               var sig = Signature.fromTxFormat(bufSig);
               var pubkey = PublicKey.fromBuffer(bufPubkey, false);
-              fOk = this.tx.verify(sig, pubkey, this.nin, subscript);
+              fOk = this.tx.verifySignature(sig, pubkey, this.nin, subscript);
             } catch (e) {
               //invalid sig or pubkey
               fOk = false;

lib/transaction/input/input.js

@@ -148,4 +148,12 @@ Input.prototype.isValidSignature = function(transaction, signature) {
   );
 };
 
+/**
+ * @returns true if this is a coinbase input (represents no input)
+ */
+Input.prototype.isNull = function() {
+  return this.prevTxId.toString('hex') === '0000000000000000000000000000000000000000000000000000000000000000' &&
+    this.outputIndex === 0xffffffff;
+};
+
 module.exports = Input;

lib/transaction/transaction.js

@@ -22,6 +22,8 @@ var MultiSigScriptHashInput = Input.MultiSigScriptHash;
 var Output = require('./output');
 var Script = require('../script');
 var PrivateKey = require('../privatekey');
+var Block = require('../block');
+var BN = require('../crypto/bn');
 
 var CURRENT_VERSION = 1;
 var DEFAULT_NLOCKTIME = 0;
@@ -57,10 +59,13 @@ function Transaction(serialized) {
   }
 }
 
+// max amount of satoshis in circulation
+Transaction.MAX_MONEY = 21000000 * 1e8;
+
 /* Constructors and Serialization */
 
 /**
- * Create a "shallow" copy of the transaction, by serializing and deserializing
+ * Create a 'shallow' copy of the transaction, by serializing and deserializing
  * it dropping any additional information that inputs and outputs may have hold
  *
  * @param {Transaction} transaction
@@ -562,8 +567,82 @@ Transaction.prototype.isValidSignature = function(signature) {
 /**
  * @returns {bool} whether the signature is valid for this transaction input
  */
-Transaction.prototype.verify = function(sig, pubkey, nin, subscript) {
+Transaction.prototype.verifySignature = function(sig, pubkey, nin, subscript) {
   return Sighash.verify(this, sig, pubkey, nin, subscript);
 };
 
+
+/**
+ * Check that a transaction passes basic sanity tests. If not, return a string
+ * describing the error. This function contains the same logic as
+ * CheckTransaction in bitcoin core.
+ */
+Transaction.prototype.verify = function() {
+  // Basic checks that don't depend on any context
+  if (this.inputs.length === 0) {
+    return 'transaction txins empty';
+  }
+
+  if (this.outputs.length === 0) {
+    return 'transaction txouts empty';
+  }
+
+  // Size limits
+  if (this.toBuffer().length > Block.MAX_BLOCK_SIZE) {
+    return 'transaction over the maximum block size';
+  }
+
+  // Check for negative or overflow output values
+  var valueoutbn = BN(0);
+  for (var i = 0; i < this.outputs.length; i++) {
+    var txout = this.outputs[i];
+    var valuebn = BN(txout.satoshis.toString(16));
+    if (valuebn.lt(0)) {
+      return 'transaction txout ' + i + ' negative';
+    }
+    if (valuebn.gt(Transaction.MAX_MONEY)) {
+      return 'transaction txout ' + i + ' greater than MAX_MONEY';
+    }
+    valueoutbn = valueoutbn.add(valuebn);
+    if (valueoutbn.gt(Transaction.MAX_MONEY)) {
+      return 'transaction txout ' + i + ' total output greater than MAX_MONEY';
+    }
+  }
+
+  // Check for duplicate inputs
+  var txinmap = {};
+  for (i = 0; i < this.inputs.length; i++) {
+    var txin = this.inputs[i];
+
+    var inputid = txin.prevTxId + ':' + txin.outputIndex;
+    if (!_.isUndefined(txinmap[inputid])) {
+      return 'transaction input ' + i + ' duplicate input';
+    }
+    txinmap[inputid] = true;
+  }
+
+  var isCoinbase = this.isCoinbase();
+  if (isCoinbase) {
+    var buf = this.inputs[0]._script.toBuffer();
+    if (buf.length < 2 || buf.length > 100) {
+      return 'coinbase trasaction script size invalid';
+    }
+  } else {
+    for (i = 0; i < this.inputs.length; i++) {
+      if (this.inputs[i].isNull()) {
+        return 'tranasction input ' + i + ' has null input';
+      }
+    }
+  }
+  return true;
+};
+
+/**
+ * Analagous to bitcoind's IsCoinBase function in transaction.h
+ */
+Transaction.prototype.isCoinbase = function() {
+  return (this.inputs.length === 1 && this.inputs[0].isNull());
+};
+
+
 module.exports = Transaction;

test/script_interpreter.js

@@ -9,6 +9,7 @@ var BN = bitcore.crypto.BN;
 var BufferReader = bitcore.encoding.BufferReader;
 var BufferWriter = bitcore.encoding.BufferWriter;
 var Opcode = bitcore.Opcode;
+var _ = require('lodash');
 
 var script_valid = require('./data/bitcoind/script_valid');
 var script_invalid = require('./data/bitcoind/script_invalid');
@@ -223,13 +224,14 @@ describe('ScriptInterpreter', function() {
 
   });
   describe('bitcoind transaction evaluation fixtures', function() {
+    var test_txs = function(set, expected) {
       var c = 0;
-    tx_valid.forEach(function(vector) {
+      set.forEach(function(vector) {
         if (vector.length === 1) {
           return;
         }
         c++;
-      it('should pass tx_valid vector ' + c, function() {
+        it('should pass tx_' + (expected ? '' : 'in') + 'valid vector ' + c, function() {
           var inputs = vector[0];
           var txhex = vector[1];
           var flags = getFlags(vector[2]);
@@ -246,6 +248,7 @@ describe('ScriptInterpreter', function() {
           });
 
           var tx = Transaction(txhex);
+          var allInputsVerified = true;
           tx.inputs.forEach(function(txin, j) {
             var scriptSig = txin.script;
             var txidhex = txin.prevTxId.toString('hex');
@@ -255,61 +258,19 @@ describe('ScriptInterpreter', function() {
             should.exist(scriptSig);
             var interp = ScriptInterpreter();
             var verified = interp.verify(scriptSig, scriptPubkey, tx, j, flags);
-          verified.should.equal(true);
-        });
-      });
-    });
-
-    c = 0;
-    tx_invalid.forEach(function(vector) {
-      if (vector.length === 1) {
-        return;
+            if (!verified) {
+              allInputsVerified = false;
             }
-      c++;
-
-      // tests intentionally not performed by the script interpreter:
-      // TODO: check this?
-      /*
-      if (c === 7 || // tests if valuebn is negative
-        c === 8 || // tests if valuebn is greater than MAX_MONEY
-        c === 10 || // tests if two inputs are equal
-        c === 11 || // coinbase
-        c === 12 || // coinbase
-        c === 13 // null input
-      ) {
-        return;
-      }
-      */
-
-      it.skip('should pass tx_invalid vector ' + c, function() {
-        var inputs = vector[0];
-        var txhex = vector[1];
-        var flags = getFlags(vector[2]);
-
-        var map = {};
-        inputs.forEach(function(input) {
-          var txoutnum = input[1];
-          if (txoutnum === -1) {
-            txoutnum = 0xffffffff; //bitcoind casts -1 to an unsigned int
-          }
-          map[input[0] + ':' + txoutnum] = Script.fromBitcoindString(input[2]);
           });
-
-        var tx = Transaction().fromBuffer(new Buffer(txhex, 'hex'));
-        if (tx.txins.length > 0) {
-          tx.txins.some(function(txin, j) {
-            var scriptSig = txin.script;
-            var txidhex = BufferReader(txin.txidbuf).readReverse().toString('hex');
-            var txoutnum = txin.txoutnum;
-            var scriptPubkey = map[txidhex + ':' + txoutnum];
-            should.exist(scriptPubkey);
-            var interp = ScriptInterpreter();
-            var verified = interp.verify(scriptSig, scriptPubkey, tx, j, flags);
-            return verified === false;
-          }).should.equal(true);
-        }
+          var txVerified = tx.verify();
+          txVerified = _.isBoolean(txVerified);
+          allInputsVerified = allInputsVerified && txVerified;
+          allInputsVerified.should.equal(expected);
         });
       });
+    };
+    test_txs(tx_valid, true);
+    test_txs(tx_invalid, false);
 
   });