105 lines
3.1 KiB
Java
105 lines
3.1 KiB
Java
/**
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* Copyright (C) 2011 Whisper Systems
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* Copyright (C) 2013 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.crypto;
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import org.thoughtcrime.securesms.logging.Log;
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import org.thoughtcrime.securesms.util.Hex;
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import org.thoughtcrime.securesms.util.Util;
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import org.session.libsignal.libsignal.InvalidKeyException;
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import org.session.libsignal.libsignal.ecc.Curve;
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import org.session.libsignal.libsignal.ecc.ECPublicKey;
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import org.thoughtcrime.securesms.util.Conversions;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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public class PublicKey {
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private static final String TAG = PublicKey.class.getSimpleName();
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public static final int KEY_SIZE = 3 + ECPublicKey.KEY_SIZE;
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private final ECPublicKey publicKey;
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private int id;
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public PublicKey(PublicKey publicKey) {
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this.id = publicKey.id;
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// FIXME :: This not strictly an accurate copy constructor.
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this.publicKey = publicKey.publicKey;
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}
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public PublicKey(int id, ECPublicKey publicKey) {
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this.publicKey = publicKey;
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this.id = id;
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}
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public PublicKey(byte[] bytes, int offset) throws InvalidKeyException {
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Log.i(TAG, "PublicKey Length: " + (bytes.length - offset));
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if ((bytes.length - offset) < KEY_SIZE)
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throw new InvalidKeyException("Provided bytes are too short.");
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this.id = Conversions.byteArrayToMedium(bytes, offset);
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this.publicKey = Curve.decodePoint(bytes, offset + 3);
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}
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public PublicKey(byte[] bytes) throws InvalidKeyException {
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this(bytes, 0);
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}
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public int getType() {
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return publicKey.getType();
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}
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public void setId(int id) {
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this.id = id;
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}
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public int getId() {
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return id;
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}
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public ECPublicKey getKey() {
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return publicKey;
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}
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public String getFingerprint() {
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return Hex.toString(getFingerprintBytes());
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}
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public byte[] getFingerprintBytes() {
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try {
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MessageDigest md = MessageDigest.getInstance("SHA-1");
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return md.digest(serialize());
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} catch (NoSuchAlgorithmException nsae) {
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Log.w("LocalKeyPair", nsae);
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throw new IllegalArgumentException("SHA-1 isn't supported!");
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}
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}
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public byte[] serialize() {
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byte[] keyIdBytes = Conversions.mediumToByteArray(id);
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byte[] serializedPoint = publicKey.serialize();
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Log.i(TAG, "Serializing public key point: " + Hex.toString(serializedPoint));
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return Util.combine(keyIdBytes, serializedPoint);
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}
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}
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