65 lines
2.1 KiB
Java
65 lines
2.1 KiB
Java
/**
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*
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* Copyright 2020 Paul Schaub.
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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 org.jivesoftware.smackx.ox;
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import static org.jivesoftware.smack.util.StringUtils.UNAMBIGUOUS_NUMBERS_AND_LETTERS_STRING;
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import java.util.regex.Pattern;
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/**
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* Represents a secret key backup passphrase whose format is described in XEP-0373 §5.3.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0373.html#backup-encryption">
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* XEP-0373 §5.4 Encrypting the Secret Key Backup</a>
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*/
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public class OpenPgpSecretKeyBackupPassphrase implements CharSequence {
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private static final Pattern PASSPHRASE_PATTERN = Pattern.compile(
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"^([" + UNAMBIGUOUS_NUMBERS_AND_LETTERS_STRING + "]{4}-){5}" +
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"[" + UNAMBIGUOUS_NUMBERS_AND_LETTERS_STRING + "]{4}$");
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private final String passphrase;
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public OpenPgpSecretKeyBackupPassphrase(String passphrase) {
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if (!PASSPHRASE_PATTERN.matcher(passphrase).matches()) {
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throw new IllegalArgumentException("Passphrase must be 24 upper case letters and numbers from the english " +
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"alphabet without 'O' and '0', divided into blocks of 4 and separated with dashes ('-').");
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}
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this.passphrase = passphrase;
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}
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@Override
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public int length() {
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return passphrase.length();
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}
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@Override
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public char charAt(int i) {
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return passphrase.charAt(i);
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}
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@Override
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public CharSequence subSequence(int i, int i1) {
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return passphrase.subSequence(i, i1);
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}
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@Override
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public String toString() {
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return passphrase;
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}
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}
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