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/**
 * Copyright 2013 Alex Yanchenko
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */
package org.droidparts.util.crypto;

import static org.droidparts.contract.Constants.UTF8;

import java.math.BigInteger;
import java.security.MessageDigest;

import org.droidparts.util.L;

public class HashCalc {

	public static final String SHA1 = "SHA-1";
	public static final String MD5 = "MD5";

	public static String getMD5(String str) {
		return getHash(str, MD5);
	}

	public static String getSHA1(String str) {
		return getHash(str, SHA1);
	}

	public static String getHash(String str, String algorithm) {
		try {
			byte[] bytes = str.getBytes(UTF8);
			MessageDigest md = MessageDigest.getInstance(algorithm);
			byte[] digest = md.digest(bytes);
			BigInteger bigInt = new BigInteger(1, digest);
			String hash = bigInt.toString(16);
			while (hash.length() < 32) {
				hash = "0" + hash;
			}
			return hash;
		} catch (Exception e) {
			L.e(e);
			return null;
		}
	}

	private HashCalc() {
	}

}