80 lines
1.9 KiB
Java
80 lines
1.9 KiB
Java
// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package sop;
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import java.util.Arrays;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import sop.util.HexUtil;
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public class SessionKey {
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private static final Pattern PATTERN = Pattern.compile("^(\\d):([0-9a-fA-F]+)$");
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private final byte algorithm;
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private final byte[] sessionKey;
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public SessionKey(byte algorithm, byte[] sessionKey) {
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this.algorithm = algorithm;
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this.sessionKey = sessionKey;
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}
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/**
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* Return the symmetric algorithm octet.
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*
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* @return algorithm id
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*/
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public byte getAlgorithm() {
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return algorithm;
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}
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/**
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* Return the session key.
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*
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* @return session key
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*/
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public byte[] getKey() {
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return sessionKey;
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}
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@Override
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public int hashCode() {
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return getAlgorithm() * 17 + Arrays.hashCode(getKey());
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}
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@Override
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public boolean equals(Object other) {
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if (other == null) {
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return false;
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}
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if (this == other) {
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return true;
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}
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if (!(other instanceof SessionKey)) {
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return false;
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}
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SessionKey otherKey = (SessionKey) other;
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return getAlgorithm() == otherKey.getAlgorithm() && Arrays.equals(getKey(), otherKey.getKey());
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}
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public static SessionKey fromString(String string) {
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Matcher matcher = PATTERN.matcher(string);
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if (!matcher.matches()) {
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throw new IllegalArgumentException("Provided session key does not match expected format.");
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}
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byte algorithm = Byte.parseByte(matcher.group(1));
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String key = matcher.group(2);
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return new SessionKey(algorithm, HexUtil.hexToBytes(key));
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}
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@Override
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public String toString() {
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return "" + (int) getAlgorithm() + ':' + HexUtil.bytesToHex(sessionKey);
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}
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}
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