91 lines
3.8 KiB
Java
91 lines
3.8 KiB
Java
/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.base.encoding;
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/**
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* <p>Convenience base for all password encoders.</p>
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*
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* @author Ben Alex
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* @version $Id: BasePasswordEncoder.java 3550 2009-04-13 13:43:23Z ltaylor $
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*/
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public abstract class BasePasswordEncoder implements PasswordEncoder {
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//~ Methods ========================================================================================================
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/**
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* Used by subclasses to extract the password and salt from a merged <code>String</code> created using
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* {@link #mergePasswordAndSalt(String,Object,boolean)}.<p>The first element in the returned array is the
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* password. The second element is the salt. The salt array element will always be present, even if no salt was
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* found in the <code>mergedPasswordSalt</code> argument.</p>
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*
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* @param mergedPasswordSalt as generated by <code>mergePasswordAndSalt</code>
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*
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* @return an array, in which the first element is the password and the second the salt
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*
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* @throws IllegalArgumentException if mergedPasswordSalt is null or empty.
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*/
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protected String[] demergePasswordAndSalt(String mergedPasswordSalt) {
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if ((mergedPasswordSalt == null) || "".equals(mergedPasswordSalt)) {
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throw new IllegalArgumentException("Cannot pass a null or empty String");
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}
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String password = mergedPasswordSalt;
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String salt = "";
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int saltBegins = mergedPasswordSalt.lastIndexOf("{");
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if ((saltBegins != -1) && ((saltBegins + 1) < mergedPasswordSalt.length())) {
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salt = mergedPasswordSalt.substring(saltBegins + 1, mergedPasswordSalt.length() - 1);
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password = mergedPasswordSalt.substring(0, saltBegins);
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}
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return new String[] {password, salt};
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}
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/**
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* Used by subclasses to generate a merged password and salt <code>String</code>.<P>The generated password
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* will be in the form of <code>password{salt}</code>.</p>
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* <p>A <code>null</code> can be passed to either method, and will be handled correctly. If the
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* <code>salt</code> is <code>null</code> or empty, the resulting generated password will simply be the passed
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* <code>password</code>. The <code>toString</code> method of the <code>salt</code> will be used to represent the
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* salt.</p>
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*
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* @param password the password to be used (can be <code>null</code>)
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* @param salt the salt to be used (can be <code>null</code>)
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* @param strict ensures salt doesn't contain the delimiters
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*
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* @return a merged password and salt <code>String</code>
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*
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* @throws IllegalArgumentException if the salt contains '{' or '}' characters.
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*/
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protected String mergePasswordAndSalt(String password, Object salt, boolean strict) {
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if (password == null) {
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password = "";
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}
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if (strict && (salt != null)) {
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if ((salt.toString().lastIndexOf("{") != -1) || (salt.toString().lastIndexOf("}") != -1)) {
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throw new IllegalArgumentException("Cannot use { or } in salt.toString()");
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}
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}
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if ((salt == null) || "".equals(salt)) {
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return password;
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} else {
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return password + "{" + salt.toString() + "}";
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}
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}
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}
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