/*
* Copyright (c) 2011, 2012 Roberto Tyley
*
* This file is part of 'Agit' - an Android Git client.
*
* Agit is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Agit 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/ .
*/
package com.madgag.agit.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class DigestUtils {
private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
'e', 'f' };
static MessageDigest getDigest(String algorithm) {
try {
return MessageDigest.getInstance(algorithm);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e.getMessage());
}
}
public static String encodeHex(byte[] data) {
int l = data.length;
char[] out = new char[l << 1];
for (int i = 0, j = 0; i < l; i++) {
out[j++] = HEX_DIGITS[(0xF0 & data[i]) >>> 4];
out[j++] = HEX_DIGITS[0x0F & data[i]];
}
return new String(out);
}
public static byte[] md5(byte[] data) {
return getDigest("MD5").digest(data);
}
public static String md5Hex(String data) {
return encodeHex(md5(utf8Bytes(data)));
}
private static byte[] utf8Bytes(String data) {
try {
return data.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
}