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Java implementation of the Simple Certificate Enrollment Protocol
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/*
* Copyright (c) 2009-2010 David Grant
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.jscep.util;
import java.util.Locale;
/**
* This class provides utilities for converting between byte
* arrays and hexadecimal strings.
*
* @author David Grant
*/
public final class HexUtil {
static final byte[] HEX_CHAR_TABLE = {
(byte)'0', (byte)'1', (byte)'2', (byte)'3',
(byte)'4', (byte)'5', (byte)'6', (byte)'7',
(byte)'8', (byte)'9', (byte)'a', (byte)'b',
(byte)'c', (byte)'d', (byte)'e', (byte)'f'
};
private HexUtil() {
// This constructor will never be invoked.
}
/**
* Converts the given byte array to an array of hex characters.
*
* @param bytes the byte array to convert.
* @return an array of hex characters.
*/
public static byte[] toHex(byte[] bytes) {
byte[] hex = new byte[2 * bytes.length];
int index = 0;
for (byte b : bytes) {
int v = b & 0xFF;
hex[index++] = HEX_CHAR_TABLE[v >>> 4];
hex[index++] = HEX_CHAR_TABLE[v & 0xF];
}
return hex;
}
/**
* Converts the provided byte array to a string of hex characters.
*
* @param bytes the byte array.
* @return a string of hex characters.
*/
public static String toHexString(byte[] bytes) {
return new String(toHex(bytes));
}
/**
* Converts the given hex string to a byte array.
*
* @param hex the hex string
* @return a byte array
*/
public static byte[] fromHex(String hex) {
return fromHex(hex.getBytes());
}
/**
* Converts the given hex array to a byte array
*
* @param hex the hex array
* @return the byte array
*/
public static byte[] fromHex(byte[] hex) {
byte[] bytes = new byte[hex.length / 2];
for (int i = 0; i < bytes.length; i++) {
int v = i * 2;
int b = Character.digit(hex[v], 16) << 4;
b = b | Character.digit(hex[v + 1], 16);
bytes[i] = (byte) (b & 0xFF);
}
return bytes;
}
/**
* Converts the given byte array to a formatted hex
* string.
*
* @param bytes the byte array.
* @return the formatted string.
*/
public static String format(byte[] bytes) {
return formatHex(toHex(bytes));
}
/**
* Converts the given byte array of hex characters
* to a formatted string.
* @param hex the byte array.
* @return the formatted string.
*/
public static String formatHex(byte[] hex) {
StringBuilder sb = new StringBuilder();
String s = new String(hex).toUpperCase(Locale.ENGLISH);
char[] c = s.toCharArray();
for (int i = 0; i < c.length; i++) {
if (i % 32 == 0) {
sb.append("\n\t");
}
sb.append(c[i]);
if (i % 2 != 0) {
sb.append(" ");
}
}
sb.append("\n");
return sb.toString();
}
}