Adding keccak256 (#2925)

* Create codeql.yml

* Keccak256

* Delete .github/workflows/codeql.yml

* Update src/Neo/SmartContract/Native/CryptoLib.cs

* add more keccak256 test cases as required

* Create codeql.yml

* Keccak256

* Delete .github/workflows/codeql.yml

* Update src/Neo/SmartContract/Native/CryptoLib.cs

* add more keccak256 test cases as required

* HF_Manticore

* Fix copyright

* Create codeql.yml

* Keccak256

* Delete .github/workflows/codeql.yml

* Update src/Neo/SmartContract/Native/CryptoLib.cs

* add more keccak256 test cases as required

* Create codeql.yml

* Keccak256

* Delete .github/workflows/codeql.yml

* Update src/Neo/SmartContract/Native/CryptoLib.cs

* add more keccak256 test cases as required

* HF_Manticore

* Fix copyright

* HF_Manticore

* Update CryptoLib.cs

* Update CryptoLib.cs

* Update UT_CryptoLib.cs

* Apply suggestions from code review

* clean usings

---------

Co-authored-by: Shargon <shargon@gmail.com>

Author: Jim8y

src/Neo/Hardfork.cs

@@ -14,6 +14,7 @@ namespace Neo
     public enum Hardfork : byte
     {
         HF_Aspidochelone,
-        HF_Basilisk
+        HF_Basilisk,
+        HF_Cockatrice
     }
 }

src/Neo/SmartContract/Native/CryptoLib.cs

@@ -11,6 +11,7 @@
 
 using Neo.Cryptography;
 using Neo.Cryptography.ECC;
+using Org.BouncyCastle.Crypto.Digests;
 using System;
 using System.Collections.Generic;
 
@@ -64,6 +65,21 @@ public static byte[] Murmur32(byte[] data, uint seed)
             return murmur.ComputeHash(data);
         }
 
+        /// <summary>
+        /// Computes the hash value for the specified byte array using the keccak256 algorithm.
+        /// </summary>
+        /// <param name="data">The input to compute the hash code for.</param>
+        /// <returns>Computed hash</returns>
+        [ContractMethod(Hardfork.HF_Cockatrice, CpuFee = 1 << 15)]
+        public static byte[] Keccak256(byte[] data)
+        {
+            KeccakDigest keccak = new(256);
+            keccak.BlockUpdate(data, 0, data.Length);
+            byte[] result = new byte[keccak.GetDigestSize()];
+            keccak.DoFinal(result, 0);
+            return result;
+        }
+
         /// <summary>
         /// Verifies that a digital signature is appropriate for the provided key and message using the ECDSA algorithm.
         /// </summary>

tests/Neo.UnitTests/SmartContract/Native/UT_CryptoLib.cs

@@ -15,6 +15,7 @@
 using Neo.SmartContract;
 using Neo.SmartContract.Native;
 using Neo.VM;
+using Org.BouncyCastle.Utilities.Encoders;
 
 namespace Neo.UnitTests.SmartContract.Native
 {
@@ -334,5 +335,97 @@ public void TestBls12381ScalarMul_Compat()
                 BLS12381PointType.G2Proj
             );
         }
+
+        /// <summary>
+        /// Keccak256 cases are verified in https://emn178.github.io/online-tools/keccak_256.html
+        /// </summary>
+        [TestMethod]
+        public void TestKeccak256_HelloWorld()
+        {
+            // Arrange
+            byte[] inputData = "Hello, World!"u8.ToArray();
+            string expectedHashHex = "acaf3289d7b601cbd114fb36c4d29c85bbfd5e133f14cb355c3fd8d99367964f";
+
+            // Act
+            byte[] outputData = CryptoLib.Keccak256(inputData);
+            string outputHashHex = Hex.ToHexString(outputData);
+
+            // Assert
+            Assert.AreEqual(expectedHashHex, outputHashHex, "Keccak256 hash did not match expected value for 'Hello, World!'.");
+        }
+        [TestMethod]
+        public void TestKeccak256_Keccak()
+        {
+            // Arrange
+            byte[] inputData = "Keccak"u8.ToArray();
+            string expectedHashHex = "868c016b666c7d3698636ee1bd023f3f065621514ab61bf26f062c175fdbe7f2";
+
+            // Act
+            byte[] outputData = CryptoLib.Keccak256(inputData);
+            string outputHashHex = Hex.ToHexString(outputData);
+
+            // Assert
+            Assert.AreEqual(expectedHashHex, outputHashHex, "Keccak256 hash did not match expected value for 'Keccak'.");
+        }
+
+        [TestMethod]
+        public void TestKeccak256_Cryptography()
+        {
+            // Arrange
+            byte[] inputData = "Cryptography"u8.ToArray();
+            string expectedHashHex = "53d49d225dd2cfe77d8c5e2112bcc9efe77bea1c7aa5e5ede5798a36e99e2d29";
+
+            // Act
+            byte[] outputData = CryptoLib.Keccak256(inputData);
+            string outputHashHex = Hex.ToHexString(outputData);
+
+            // Assert
+            Assert.AreEqual(expectedHashHex, outputHashHex, "Keccak256 hash did not match expected value for 'Cryptography'.");
+        }
+
+        [TestMethod]
+        public void TestKeccak256_Testing123()
+        {
+            // Arrange
+            byte[] inputData = "Testing123"u8.ToArray();
+            string expectedHashHex = "3f82db7b16b0818a1c6b2c6152e265f682d5ebcf497c9aad776ad38bc39cb6ca";
+
+            // Act
+            byte[] outputData = CryptoLib.Keccak256(inputData);
+            string outputHashHex = Hex.ToHexString(outputData);
+
+            // Assert
+            Assert.AreEqual(expectedHashHex, outputHashHex, "Keccak256 hash did not match expected value for 'Testing123'.");
+        }
+
+        [TestMethod]
+        public void TestKeccak256_LongString()
+        {
+            // Arrange
+            byte[] inputData = "This is a longer string for Keccak256 testing purposes."u8.ToArray();
+            string expectedHashHex = "24115e5c2359f85f6840b42acd2f7ea47bc239583e576d766fa173bf711bdd2f";
+
+            // Act
+            byte[] outputData = CryptoLib.Keccak256(inputData);
+            string outputHashHex = Hex.ToHexString(outputData);
+
+            // Assert
+            Assert.AreEqual(expectedHashHex, outputHashHex, "Keccak256 hash did not match expected value for the longer string.");
+        }
+
+        [TestMethod]
+        public void TestKeccak256_BlankString()
+        {
+            // Arrange
+            byte[] inputData = ""u8.ToArray();
+            string expectedHashHex = "c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470";
+
+            // Act
+            byte[] outputData = CryptoLib.Keccak256(inputData);
+            string outputHashHex = Hex.ToHexString(outputData);
+
+            // Assert
+            Assert.AreEqual(expectedHashHex, outputHashHex, "Keccak256 hash did not match expected value for blank string.");
+        }
     }
 }