/*
* Copyright 2010 Srikanth Reddy Lingala
*
* 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 net.lingala.zip4j.crypto.PBKDF2;
/*
* Source referred from Matthias Gartner's PKCS#5 implementation -
* see http://rtner.de/software/PBKDF2.html
*/
class BinTools
{
public static final String hex = "0123456789ABCDEF";
public static String bin2hex(final byte[] b)
{
if (b == null)
{
return "";
}
StringBuffer sb = new StringBuffer(2 * b.length);
for (int i = 0; i < b.length; i++)
{
int v = (256 + b[i]) % 256;
sb.append(hex.charAt((v / 16) & 15));
sb.append(hex.charAt((v % 16) & 15));
}
return sb.toString();
}
public static byte[] hex2bin(final String s)
{
String m = s;
if (s == null)
{
// Allow empty input string.
m = "";
}
else if (s.length() % 2 != 0)
{
// Assume leading zero for odd string length
m = "0" + s;
}
byte r[] = new byte[m.length() / 2];
for (int i = 0, n = 0; i < m.length(); n++)
{
char h = m.charAt(i++);
char l = m.charAt(i++);
r[n] = (byte) (hex2bin(h) * 16 + hex2bin(l));
}
return r;
}
public static int hex2bin(char c)
{
if (c >= '0' && c <= '9')
{
return (c - '0');
}
if (c >= 'A' && c <= 'F')
{
return (c - 'A' + 10);
}
if (c >= 'a' && c <= 'f')
{
return (c - 'a' + 10);
}
throw new IllegalArgumentException(
"Input string may only contain hex digits, but found '" + c
+ "'");
}
}