fix: BLAKE2 test implementation (#435)

* fix: `BLAKE2` test implementation

* chore: nit

Author: leovct

bindings/tester/LoadTester.abi

@@ -1,4 +1,43 @@
 [
+  {
+    "type": "function",
+    "name": "F",
+    "inputs": [
+      {
+        "name": "rounds",
+        "type": "uint32",
+        "internalType": "uint32"
+      },
+      {
+        "name": "h",
+        "type": "bytes32[2]",
+        "internalType": "bytes32[2]"
+      },
+      {
+        "name": "m",
+        "type": "bytes32[4]",
+        "internalType": "bytes32[4]"
+      },
+      {
+        "name": "t",
+        "type": "bytes8[2]",
+        "internalType": "bytes8[2]"
+      },
+      {
+        "name": "f",
+        "type": "bool",
+        "internalType": "bool"
+      }
+    ],
+    "outputs": [
+      {
+        "name": "",
+        "type": "bytes32[2]",
+        "internalType": "bytes32[2]"
+      }
+    ],
+    "stateMutability": "view"
+  },
   {
     "type": "function",
     "name": "dumpster",

bindings/tester/LoadTester.bin

@@ -911,22 +911,40 @@ contract LoadTester {
         }
     }
 
+    // https://eips.ethereum.org/EIPS/eip-152#example-usage-in-solidity
     function testBlake2f(bytes memory inputData) public returns (bytes memory result) {
+        bytes32[2] memory h;
+        h[0] = hex"48c9bdf267e6096a3ba7ca8485ae67bb2bf894fe72f36e3cf1361d5f3af54fa5";
+        h[1] = hex"d182e6ad7f520e511f6c3e2b8c68059b6bbd41fbabd9831f79217e1319cde05b";
+
+        bytes32[4] memory m;
+        m[0] = hex"6162630000000000000000000000000000000000000000000000000000000000";
+        m[1] = hex"0000000000000000000000000000000000000000000000000000000000000000";
+        m[2] = hex"0000000000000000000000000000000000000000000000000000000000000000";
+        m[3] = hex"0000000000000000000000000000000000000000000000000000000000000000";
+
+        bytes8[2] memory t;
+        t[0] = hex"0300000000000000";
+        t[1] = hex"0000000000000000";
+
+        bytes32[2] memory result = F(12, h, m, t, true);
+        bytes32[2] memory expected;
+        expected[0] = hex"ba80a53f981c4d0d6a2797b69f12f6e94c212f14685ac4b74b12bb6fdbffa2d1";
+        expected[1] = hex"7d87c5392aab792dc252d5de4533cc9518d38aa8dbf1925ab92386edd4009923";
+        require(result[0] == expected[0], "TestBlake2f - First hash doesn't match");
+        require(result[1] == expected[1], "TestBlake2f - Second hash doesn't match");
+    }
+
+    function F(uint32 rounds, bytes32[2] memory h, bytes32[4] memory m, bytes8[2] memory t, bool f) public view returns (bytes32[2] memory) {
         address BLAKE_2F_PRECOMPILED_CONTRACT = 0x0000000000000000000000000000000000000009;
 
+        bytes32[2] memory output;
+        bytes memory args = abi.encodePacked(rounds, h[0], h[1], m[0], m[1], m[2], m[3], t[0], t[1], f);
         assembly {
-            let success := call(
-                gas(),
-                BLAKE_2F_PRECOMPILED_CONTRACT,
-                0,                       // no ether transfer
-                add(inputData, 32),      // inputData offset
-                mload(inputData),        // inputData length
-                result,                  // output area
-                64                       // output area size (2 * 32 bytes)
-            )
-            if iszero(success) {
-                revert(0, 0)
+            if iszero(staticcall(not(0), BLAKE_2F_PRECOMPILED_CONTRACT, add(args, 32), 0xd5, output, 0x40)) {
+            revert(0, 0)
             }
         }
+        return output;
     }
 }