tapscript: implement OP_CHECKSIGADD

Bit-Wasp · Nov 11, 2019 · f6c483e · f6c483e
1 parent bb1571b
commit f6c483e
Show file tree

Hide file tree

Showing 2 changed files with 23 additions and 0 deletions.
diff --git a/src/Script/Interpreter/Interpreter.php b/src/Script/Interpreter/Interpreter.php
@@ -1074,6 +1074,27 @@ public function evaluate(ScriptInterface $script, Stack $mainStack, int $sigVers
                             $hashStartPos = $parser->getPosition();
                             break;
 
+                        case Opcodes::OP_CHECKSIGADD:
+                            if ($sigVersion !== SigHash::TAPSCRIPT) {
+                                throw new \RuntimeException('Opcode not found');
+                            }
+                            if ($mainStack->count() < 3) {
+                                return false;
+                            }
+                            $pubkey = $mainStack[-1];
+                            $n = Number::buffer($mainStack[-2], $minimal, Number::MAX_NUM_SIZE, $this->math);
+                            $sig = $mainStack[-3];
+
+                            $success = false;
+                            if (!$this->evalChecksig($sig, $pubkey, $script, $hashStartPos, $flags, $checker, $sigVersion, $execContext, $success)) {
+                                return false;
+                            }
+                            $mainStack->pop();
+                            $mainStack->pop();
+                            $mainStack->pop();
+                            $mainStack->push(Number::gmp($this->math->add($n->getGmp(), gmp_init($success ? 1 : 0, 10)), $this->math));
+                            break;
+
                         case Opcodes::OP_CHECKSIG:
                         case Opcodes::OP_CHECKSIGVERIFY:
                             if (count($mainStack) < 2) {

diff --git a/src/Script/Opcodes.php b/src/Script/Opcodes.php
@@ -136,6 +136,7 @@ class Opcodes implements \ArrayAccess
     const OP_NOP8 = 183;
     const OP_NOP9 = 184;
     const OP_NOP10 = 185;
+    const OP_CHECKSIGADD = 186;
 
     /**
      * @var array
@@ -270,6 +271,7 @@ class Opcodes implements \ArrayAccess
         self::OP_NOP8 => 'OP_NOP8',
         self::OP_NOP9 => 'OP_NOP9',
         self::OP_NOP10 => 'OP_NOP10',
+        self::OP_CHECKSIGADD => 'OP_CHECKSIGADD',
     ];
 
     /**