--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/ch/ethz/ssh2/crypto/digest/HashForSSH2Types.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
+ * Please refer to the LICENSE.txt for licensing details.
+ */
+package ch.ethz.ssh2.crypto.digest;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.security.DigestException;
+
+/**
+ * HashForSSH2Types.
+ *
+ * @author Christian Plattner
+ * @version 2.50, 03/15/10
+ */
+public class HashForSSH2Types {
+    Digest md;
+
+    public HashForSSH2Types(Digest md) {
+        this.md = md;
+    }
+
+    public HashForSSH2Types(String type) {
+        if (type.equals("SHA1")) {
+            md = new SHA1();
+        }
+        else if (type.equals("SHA2")) {
+            md = new SHA256();
+        }
+        else if (type.equals("MD5")) {
+            md = new MD5();
+        }
+        else {
+            throw new IllegalArgumentException(String.format("Unknown algorithm %s", type));
+        }
+    }
+
+    public void updateByte(byte b) {
+        md.update(b);
+    }
+
+    public void updateBytes(byte[] b) {
+        md.update(b);
+    }
+
+    public void updateUINT32(int v) {
+        md.update((byte)(v >> 24));
+        md.update((byte)(v >> 16));
+        md.update((byte)(v >> 8));
+        md.update((byte)(v));
+    }
+
+    public void updateByteString(byte[] b) {
+        updateUINT32(b.length);
+        updateBytes(b);
+    }
+
+    public void updateBigInt(BigInteger b) {
+        updateByteString(b.toByteArray());
+    }
+
+    public void reset() {
+        md.reset();
+    }
+
+    public int getDigestLength() {
+        return md.getDigestLength();
+    }
+
+    public byte[] getDigest() throws IOException {
+        byte[] tmp = new byte[md.getDigestLength()];
+        getDigest(tmp);
+        return tmp;
+    }
+
+    public void getDigest(byte[] out) throws IOException {
+        try {
+            getDigest(out, 0);
+        }
+        catch (DigestException e) {
+            throw new IOException(e);
+        }
+    }
+
+    public void getDigest(byte[] out, int off) throws DigestException {
+        md.digest(out, off);
+    }
+}