Add keccak_256 hashing

README.md

@@ -14,7 +14,7 @@ The Ballerina `crypto` library facilitates APIs to do operations like hashing, H
 
 ### Hashes
 
-The `crypto` library supports generating hashes with 5 different hash algorithms MD5, SHA1, SHA256, SHA384, and SHA512. Also, it supports generating the CRC32B checksum.
+The `crypto` library supports generating hashes with 6 different hash algorithms MD5, SHA1, SHA256, SHA384, SHA512, and Keccak256. Also, it supports generating the CRC32B checksum.
 
 ### HMAC
 

ballerina/README.md

@@ -6,7 +6,7 @@ The Ballerina `crypto` module facilitates APIs to do operations like hashing, HM
 
 ### Hashes
 
-The `crypto` module supports generating hashes with 5 different hash algorithms MD5, SHA1, SHA256, SHA384, and SHA512. Also, it supports generating the CRC32B checksum.
+The `crypto` module supports generating hashes with 6 different hash algorithms MD5, SHA1, SHA256, SHA384, SHA512, and Keccak256. Also, it supports generating the CRC32B checksum.
 
 ### HMAC
 

ballerina/hash.bal

@@ -104,3 +104,18 @@ public isolated function crc32b(byte[] input) returns string = @java:Method {
     name: "crc32b",
     'class: "io.ballerina.stdlib.crypto.nativeimpl.Hash"
 } external;
+
+# Returns the Keccak-256 hash of the given data.
+# ```ballerina
+# string dataString = "Hello Ballerina";
+# byte[] data = dataString.toBytes();
+# byte[] hash = crypto:hashKeccak256(data);
+# ```
+#
+# + input - Value to be hashed
+# + salt - Salt to be added
+# + return - Hashed output
+public isolated function hashKeccak256(byte[] input, byte[]? salt = ()) returns byte[] = @java:Method {
+    name: "hashKeccak256",
+    'class: "io.ballerina.stdlib.crypto.nativeimpl.Hash"
+} external;

ballerina/tests/hash_test.bal

@@ -102,3 +102,11 @@ isolated function testHashSha512WithSalt() {
         "5E78702995D181042420860B111781AFEE88ACD455CAA0367271C78DAE0F69DA").toLowerAscii();
     test:assertEquals(hashSha512(input, salt).toBase16(), expectedSha512Hash);
 }
+
+@test:Config {}
+isolated function testHashKeccak256() {
+    byte[] input = "Ballerina test".toBytes();
+    string expectedKeccak256Hash =
+        "73b6cc25ab0656625ee654a6cdc8f1d1803a6330fba4f4bf5bd6b9018f7d3131".toLowerAscii();
+    test:assertEquals(hashKeccak256(input).toBase16(), expectedKeccak256Hash);
+}

native/src/main/java/io/ballerina/stdlib/crypto/CryptoUtils.java

@@ -34,6 +34,7 @@
 import org.bouncycastle.crypto.params.KeyParameter;
 import org.bouncycastle.crypto.params.RSAKeyParameters;
 import org.bouncycastle.jcajce.SecretKeyWithEncapsulation;
+import org.bouncycastle.jcajce.provider.digest.Keccak;
 import org.bouncycastle.jcajce.spec.KEMExtractSpec;
 import org.bouncycastle.jcajce.spec.KEMGenerateSpec;
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
@@ -124,7 +125,14 @@ public static Object hmac(String algorithm, byte[] key, byte[] input) {
      */
     public static byte[] hash(String algorithm, byte[] input, Object salt) {
         try {
-            MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
+            MessageDigest messageDigest;
+
+            if ("Keccak-256".equalsIgnoreCase(algorithm)) {
+                messageDigest = new Keccak.Digest256();
+            } else {
+                messageDigest = MessageDigest.getInstance(algorithm);
+            }
+
             if (salt != null) {
                 messageDigest.update(((BArray) salt).getBytes());
             }

native/src/main/java/io/ballerina/stdlib/crypto/nativeimpl/Hash.java

@@ -64,4 +64,8 @@ public static BArray hashSha512(BArray inputValue, Object saltValue) {
         return ValueCreator.createArrayValue(CryptoUtils.hash("SHA-512", inputValue.getBytes(), saltValue));
     }
 
+    public static BArray hashKeccak256(BArray inputValue, Object saltValue) {
+        return ValueCreator.createArrayValue(CryptoUtils.hash("Keccak-256", inputValue.getBytes(), saltValue));
+    }
+
 }