add keccak 256 from constantine

constantine/jna_ethereum_evm_precompiles.c

@@ -60,4 +60,9 @@ int bls12381_mapFpToG1(byte* r, int r_len, const byte* inputs, int inputs_len) {
 
 int bls12381_mapFp2ToG2(byte* r, int r_len, const byte* inputs, int inputs_len) {
     return (int) ctt_eth_evm_bls12381_map_fp2_to_g2(r, (ptrdiff_t)r_len, inputs, (ptrdiff_t)inputs_len);
+}
+
+
+void keccak256(byte* result, byte* message, int message_len) {
+    ctt_keccak256_hash(result, message, (ptrdiff_t)message_len,0);
 }

constantine/src/main/java/org/hyperledger/besu/nativelib/constantine/LibConstantineKeccak256.java

@@ -0,0 +1,28 @@
+package org.hyperledger.besu.nativelib.constantine;
+
+import com.sun.jna.Native;
+
+public class LibConstantineKeccak256 {
+    public static final boolean ENABLED;
+
+    static {
+        boolean enabled;
+        try {
+            Native.register(LibConstantineKeccak256.class, "constantinebindings");
+            enabled = true;
+        } catch (final Throwable t) {
+            t.printStackTrace();
+            enabled = false;
+        }
+        ENABLED = enabled;
+    }
+
+    public static native int keccak256(byte[] output, byte[] input, int input_len);
+
+    public static byte[] keccak256(byte[] input) {
+        byte[] output = new byte[32];
+        keccak256(output, input, input.length);
+        return output;
+    }
+
+}

constantine/src/test/java/org/hyperledger/besu/nativelib/constantine/LibConstantineKeccak256Test.java

@@ -0,0 +1,22 @@
+package org.hyperledger.besu.nativelib.constantine;
+
+import org.apache.tuweni.bytes.Bytes;
+import org.junit.Test;
+
+import java.nio.charset.StandardCharsets;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertThrows;
+
+public class LibConstantineKeccak256Test {
+
+    @Test
+    public void testKeccakNonimalCase() {
+        final byte[] inputs = "testKeccak256".getBytes(StandardCharsets.UTF_8);
+        final byte[] result = LibConstantineKeccak256.keccak256(inputs);
+        assertEquals(Bytes.wrap(result), Bytes.fromHexString("0xfe8baa653979909c621153b53c973bab3832768b5e77896a5b5944d20d48c7a6"));
+    }
+
+
+}