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/*
 * Copyright (C) 2018 The DNA Authors
 * This file is part of The DNA library.
 *
 *  The DNA is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  The DNA is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with The DNA.  If not, see .
 *
 */
package com.github.DNAProject.crypto;

import java.security.*;


import org.bouncycastle.crypto.digests.SHA512Digest;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;

public class Digest {
	static {
		Security.addProvider(new BouncyCastleProvider());
	}

	public static byte[] hash160(byte[] value) {
		return ripemd160(sha256(value));
	}

	public static byte[] hash256(byte[] value) {
		return sha256(sha256(value));
	}

	public static byte[] hash256(byte[] value, int offset, int length) {
		if (offset != 0 || length != value.length) {
			byte[] array = new byte[length];
			System.arraycopy(value, offset, array, 0, length);
			value = array;
		}
		return sha256(sha256(value));
	}

	public static byte[] ripemd160(byte[] value) {
		try {
			MessageDigest md = MessageDigest.getInstance("RipeMD160");
			return md.digest(value);
		} catch (NoSuchAlgorithmException ex) {
			throw new RuntimeException(ex);
		}
	}

	public static byte[] sha256(byte[] value) {
		try {
			MessageDigest md = MessageDigest.getInstance("SHA-256");
			return md.digest(value);
		} catch (NoSuchAlgorithmException ex) {
			throw new RuntimeException(ex);
		}
	}

	public static byte[] sha256(byte[] value, int offset, int length) {
		if (offset != 0 || length != value.length) {
			byte[] array = new byte[length];
			System.arraycopy(value, offset, array, 0, length);
			value = array;
		}
		return sha256(value);
	}

	public static byte[] hmacSha512(byte[] keyBytes, byte[] text) {
		HMac hmac = new HMac(new SHA512Digest());
		byte[] resBuf = new byte[hmac.getMacSize()];
		CipherParameters pm = new KeyParameter(keyBytes);
		hmac.init(pm);
		hmac.update(text, 0, text.length);
		hmac.doFinal(resBuf, 0);
		return resBuf;
	}

}