/*
* Copyright (C) 2015 RoboVM AB
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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/gpl-2.0.html>.
*/
package org.robovm.compiler.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Utility methods for calculating hashes.
*/
public class DigestUtil {
private static final String HEX_CHARS = "0123456789abcdef";
private static MessageDigest getDigest(String algorithm) {
try {
return MessageDigest.getInstance(algorithm);
} catch (NoSuchAlgorithmException ex) {
throw new Error("Could not find MessageDigest algorithm " + algorithm, ex);
}
}
public static String sha1(String s) {
try {
return encodeHex(digest("SHA1", s.getBytes("utf8")));
} catch (UnsupportedEncodingException e) {
throw new Error(e);
}
}
private static byte[] digest(String algorithm, byte[] bytes) {
return getDigest(algorithm).digest(bytes);
}
private static String encodeHex(byte[] bytes) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.length; i++) {
int b = bytes[i] & 0xff;
sb.append(HEX_CHARS.charAt((b >> 4) & 0xf));
sb.append(HEX_CHARS.charAt(b & 0xf));
}
return sb.toString();
}
}