Added support of MessageDigest hashing

Author: GreenWizard2015

src/YASL/Hashing/CMessageDigestHashing.java

@@ -0,0 +1,22 @@
+package YASL.Hashing;
+
+import java.nio.ByteBuffer;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+public class CMessageDigestHashing implements IHashingAlgorithm<byte[]> {
+	private final MessageDigest _digest;
+
+	public CMessageDigestHashing(MessageDigest _digest) {
+		this._digest = _digest;
+	}
+
+	public CMessageDigestHashing(String algo) throws NoSuchAlgorithmException {
+		this(MessageDigest.getInstance(algo));
+	}
+
+	@Override
+	public void hash(byte[] value, ByteBuffer res) {
+		res.put(_digest.digest(value));
+	}
+}

src/YASL/Hashing/ChgCombined.java

@@ -3,10 +3,6 @@
 import java.nio.ByteBuffer;
 
 public class ChgCombined<T> implements IHashingGenerator<T> {
-	public interface ISalter<T> {
-		public T apply(T value, int round);
-	}
-
 	private final IHashingAlgorithm<T>[]	_hashes;
 	private final ISalter<T>							_salting;
 

src/YASL/Hashing/ChgString.java

@@ -0,0 +1,30 @@
+package YASL.Hashing;
+
+public class ChgString implements IHashingGenerator<String> {
+	private final IHashingGenerator<byte[]> _gen;
+
+	@SafeVarargs
+	public ChgString(IHashingAlgorithm<byte[]>... hashes) {
+		this._gen = new ChgCombined<byte[]>( //
+		    ChgString::rotateBytes, //
+		    hashes //
+		);
+	}
+
+	private static byte[] rotateBytes(byte[] src, int round) {
+		byte[] res = new byte[src.length];
+		round %= src.length;
+		System.arraycopy(src, 0, res, round, src.length - round);
+		System.arraycopy(src, src.length - round, res, 0, round);
+		return res;
+	}
+
+	@Override
+	public IHasher<String> generate(int range, int levels) {
+		IHasher<byte[]> hashing = _gen.generate(range, levels);
+		return x -> {
+			return hashing.apply(x.getBytes());
+		};
+	}
+
+}

src/YASL/Hashing/ISalter.java

@@ -0,0 +1,5 @@
+package YASL.Hashing;
+
+public interface ISalter<T> {
+	public T apply(T value, int round);
+}