Fix hash class

(cherry picked from commit 5322c50)

Author: sgrampone

gamutils/src/main/java/com/genexus/gam/GamUtilsEO.java

@@ -16,11 +16,11 @@ public class GamUtilsEO {
 
 	//**HASH**//
 	public static String sha512(String plainText) {
-		return Hash.sha512(plainText);
+		return Hash.hash(plainText, Hash.SHA512);
 	}
 
 	public static String sha256(String plainText) {
-		return Hash.sha256(plainText);
+		return Hash.hash(plainText, Hash.SHA256);
 	}
 
 	//**ENCRYPTION**//

gamutils/src/main/java/com/genexus/gam/utils/cryptography/Hash.java

@@ -9,19 +9,24 @@
 
 import java.nio.charset.StandardCharsets;
 
-public class Hash {
+public enum Hash {
 
-	private static Logger logger = LogManager.getLogger(Hash.class);
+	SHA256, SHA512;
 
-	public static String sha512(String plainText) {
-		logger.debug("sha512");
-		return internalHash(new SHA512Digest(), plainText);
-	}
+	private static final Logger logger = LogManager.getLogger(Hash.class);
 
-	public static String sha256(String plainText)
+	public static String hash(String plainText, Hash hash)
 	{
-		logger.debug("sha256");
-		return internalHash(new SHA256Digest(), plainText);
+		switch (hash)
+		{
+			case SHA256:
+				return internalHash(new SHA256Digest(), plainText);
+			case SHA512:
+				return internalHash(new SHA512Digest(), plainText);
+			default:
+				logger.error("unrecognized hash");
+				return "";
+		}
 	}
 
 	private static String internalHash(Digest digest, String plainText)