80 lines
2.0 KiB
Java
80 lines
2.0 KiB
Java
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/*
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* Copyright (c) 2010
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*
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* Robert von Burg
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* eitch@eitchnet.ch
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*
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* All rights reserved.
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*
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*/
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package ch.eitchnet.privilege.handler;
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import java.io.UnsupportedEncodingException;
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import java.math.BigInteger;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import org.dom4j.Element;
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import ch.eitchnet.privilege.i18n.PrivilegeException;
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/**
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* @author rvonburg
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*
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*/
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public class DefaultEncryptionHandler implements EncryptionHandler {
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public static final String HASH_ALGORITHM = "SHA-1";
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/**
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* Hex char table for fast calculating of hex value
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*/
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private static final byte[] HEX_CHAR_TABLE = { (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4',
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(byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd',
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(byte) 'e', (byte) 'f' };
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/**
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* @see ch.eitchnet.privilege.handler.EncryptionHandler#convertToHash(java.lang.String)
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*/
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@Override
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public String convertToHash(String string) {
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try {
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MessageDigest digest = MessageDigest.getInstance(HASH_ALGORITHM);
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byte[] hashArray = digest.digest(string.getBytes());
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byte[] hex = new byte[2 * hashArray.length];
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int index = 0;
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for (byte b : hashArray) {
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int v = b & 0xFF;
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hex[index++] = HEX_CHAR_TABLE[v >>> 4];
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hex[index++] = HEX_CHAR_TABLE[v & 0xF];
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}
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return new String(hex, "ASCII");
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} catch (NoSuchAlgorithmException e) {
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throw new PrivilegeException("Algorithm " + HASH_ALGORITHM + " was not found!", e);
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} catch (UnsupportedEncodingException e) {
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throw new PrivilegeException("Charset ASCII is not supported!", e);
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}
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}
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/**
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* @see ch.eitchnet.privilege.handler.EncryptionHandler#nextToken()
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*/
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@Override
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public String nextToken() {
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SecureRandom secureRandom = new SecureRandom();
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String randomString = new BigInteger(130, secureRandom).toString(32);
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return randomString;
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}
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public void initialize(Element element) {
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// TODO implement
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}
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}
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