131 lines
4.7 KiB
Java
131 lines
4.7 KiB
Java
/*
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* Copyright (C) 2017 Christian Hagau <ach@hagau.se>
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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.sufficientlysecure.keychain.pgp;
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import org.bouncycastle.bcpg.DSAPublicBCPGKey;
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import org.bouncycastle.bcpg.ECPublicBCPGKey;
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import org.bouncycastle.bcpg.EdDSAPublicBCPGKey;
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import org.bouncycastle.bcpg.RSAPublicBCPGKey;
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import org.bouncycastle.openpgp.PGPPublicKey;
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import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
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import org.sufficientlysecure.keychain.ssh.key.SshDSAPublicKey;
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import org.sufficientlysecure.keychain.ssh.key.SshECDSAPublicKey;
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import org.sufficientlysecure.keychain.ssh.key.SshEd25519PublicKey;
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import org.sufficientlysecure.keychain.ssh.key.SshRSAPublicKey;
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public class SshPublicKey {
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private final static String TAG = "SshPublicKey";
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private CanonicalizedPublicKey mPublicKey;
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public SshPublicKey(CanonicalizedPublicKey publicKey) {
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mPublicKey = publicKey;
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}
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public String getEncodedKey() throws PgpGeneralException {
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PGPPublicKey key = mPublicKey.getPublicKey();
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switch (key.getAlgorithm()) {
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case PGPPublicKey.RSA_GENERAL:
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return encodeRSAKey(key);
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case PGPPublicKey.ECDSA:
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return encodeECKey(key);
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case PGPPublicKey.EDDSA:
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return encodeEdDSAKey(key);
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case PGPPublicKey.DSA:
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return encodeDSAKey(key);
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default:
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break;
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}
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throw new PgpGeneralException("Unknown algorithm");
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}
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private String encodeRSAKey(PGPPublicKey publicKey) {
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RSAPublicBCPGKey publicBCPGKey = (RSAPublicBCPGKey) publicKey.getPublicKeyPacket().getKey();
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SshRSAPublicKey pubkey = new SshRSAPublicKey(publicBCPGKey.getPublicExponent(), publicBCPGKey.getModulus());
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return pubkey.getPublicKeyBlob();
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}
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private String encodeECKey(PGPPublicKey publicKey) {
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ECPublicBCPGKey publicBCPGKey = (ECPublicBCPGKey) publicKey.getPublicKeyPacket().getKey();
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String curveName = getCurveName(publicBCPGKey);
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SshECDSAPublicKey sshECDSAPublicKey = new SshECDSAPublicKey(curveName, publicBCPGKey.getEncodedPoint());
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return sshECDSAPublicKey.getPublicKeyBlob();
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}
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private String getCurveName(ECPublicBCPGKey publicBCPGKey) {
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String curveOid = publicBCPGKey.getCurveOID().getId();
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// see RFC5656 section 10.{1,2}
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switch (curveOid) {
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// REQUIRED curves
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case "1.2.840.10045.3.1.7":
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return "nistp256";
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case "1.3.132.0.34":
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return "nistp384";
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case "1.3.132.0.35":
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return "nistp521";
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// RECOMMENDED curves
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case "1.3.132.0.1":
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return "1.3.132.0.1";
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case "1.2.840.10045.3.1.1":
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return "1.2.840.10045.3.1.1";
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case "1.3.132.0.33":
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return "1.3.132.0.33";
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case "1.3.132.0.26":
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return "1.3.132.0.26";
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case "1.3.132.0.27":
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return "1.3.132.0.27";
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case "1.3.132.0.16":
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return "1.3.132.0.16";
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case "1.3.132.0.36":
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return "1.3.132.0.36";
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case "1.3.132.0.37":
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return "1.3.132.0.37";
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case "1.3.132.0.38":
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return "1.3.132.0.38";
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default:
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return null;
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}
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}
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private String encodeEdDSAKey(PGPPublicKey publicKey) {
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EdDSAPublicBCPGKey publicBCPGKey = (EdDSAPublicBCPGKey) publicKey.getPublicKeyPacket().getKey();
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SshEd25519PublicKey pubkey = new SshEd25519PublicKey(publicBCPGKey.getEdDSAEncodedPoint());
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return pubkey.getPublicKeyBlob();
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}
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private String encodeDSAKey(PGPPublicKey publicKey) {
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DSAPublicBCPGKey publicBCPGKey = (DSAPublicBCPGKey) publicKey.getPublicKeyPacket().getKey();
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SshDSAPublicKey sshDSAPublicKey = new SshDSAPublicKey(publicBCPGKey.getP(),
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publicBCPGKey.getQ(),
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publicBCPGKey.getG(),
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publicBCPGKey.getY());
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return sshDSAPublicKey.getPublicKeyBlob();
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}
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}
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