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52 lines
1.7 KiB
Java
52 lines
1.7 KiB
Java
/**
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* Copyright (C) 2014 Open Whisper Systems
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.thoughtcrime.securesms.util;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.Map;
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public class DirectoryUtil {
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public static String getDirectoryServerToken(String e164number) {
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try {
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MessageDigest digest = MessageDigest.getInstance("SHA1");
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byte[] token = Util.trim(digest.digest(e164number.getBytes()), 10);
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return Base64.encodeBytesWithoutPadding(token);
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} catch (NoSuchAlgorithmException e) {
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throw new AssertionError(e);
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}
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}
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/**
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* Get a mapping of directory server tokens to their requested number.
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* @param e164numbers
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* @return map with token as key, E164 number as value
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*/
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public static Map<String, String> getDirectoryServerTokenMap(Collection<String> e164numbers) {
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final Map<String,String> tokenMap = new HashMap<String,String>(e164numbers.size());
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for (String number : e164numbers) {
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tokenMap.put(getDirectoryServerToken(number), number);
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}
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return tokenMap;
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}
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}
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