59 lines
1.8 KiB
Java
59 lines
1.8 KiB
Java
/**
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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.whispersystems.libaxolotl.ecc;
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import org.whispersystems.libaxolotl.InvalidKeyException;
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public class Curve {
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public static final int DJB_TYPE = 0x05;
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public static ECKeyPair generateKeyPair(boolean ephemeral) {
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return Curve25519.generateKeyPair(ephemeral);
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}
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public static ECPublicKey decodePoint(byte[] bytes, int offset)
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throws InvalidKeyException
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{
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int type = bytes[offset];
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if (type == DJB_TYPE) {
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return Curve25519.decodePoint(bytes, offset);
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} else {
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throw new InvalidKeyException("Unknown key type: " + type);
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}
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}
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public static ECPrivateKey decodePrivatePoint(byte[] bytes) {
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return new DjbECPrivateKey(bytes);
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}
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public static byte[] calculateAgreement(ECPublicKey publicKey, ECPrivateKey privateKey)
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throws InvalidKeyException
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{
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if (publicKey.getType() != privateKey.getType()) {
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throw new InvalidKeyException("Public and private keys must be of the same type!");
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}
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if (publicKey.getType() == DJB_TYPE) {
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return Curve25519.calculateAgreement(publicKey, privateKey);
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} else {
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throw new InvalidKeyException("Unknown type: " + publicKey.getType());
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}
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}
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}
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