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/*
* Copyright (C) 2012-2013 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.openpgp.PGPKeyRing;
import org.spongycastle.openpgp.PGPObjectFactory;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.PGPSecretKeyRing;
import org.spongycastle.openpgp.PGPSignature;
import org.spongycastle.openpgp.PGPSignatureList;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
public class PgpConversionHelper {
/**
* Convert from byte[] to PGPKeyRing
*
* @param keysBytes
* @return
*/
public static PGPKeyRing BytesToPGPKeyRing(byte[] keysBytes) {
PGPObjectFactory factory = new PGPObjectFactory(keysBytes);
PGPKeyRing keyRing = null;
try {
if ((keyRing = (PGPKeyRing) factory.nextObject()) == null) {
Log.e(Constants.TAG, "No keys given!");
}
} catch (IOException e) {
Log.e(Constants.TAG, "Error while converting to PGPKeyRing!", e);
}
return keyRing;
}
/**
* Convert from byte[] to ArrayList<PGPSecretKey>
*
* @param keysBytes
* @return
*/
public static ArrayList<PGPSecretKey> BytesToPGPSecretKeyList(byte[] keysBytes) {
PGPObjectFactory factory = new PGPObjectFactory(keysBytes);
Object obj = null;
ArrayList<PGPSecretKey> keys = new ArrayList<PGPSecretKey>();
try {
while ((obj = factory.nextObject()) != null) {
PGPSecretKey secKey = null;
if (obj instanceof PGPSecretKey) {
secKey = (PGPSecretKey) obj;
if (secKey == null) {
Log.e(Constants.TAG, "No keys given!");
}
keys.add(secKey);
} else if (obj instanceof PGPSecretKeyRing) { //master keys are sent as keyrings
PGPSecretKeyRing keyRing = null;
keyRing = (PGPSecretKeyRing) obj;
if (keyRing == null) {
Log.e(Constants.TAG, "No keys given!");
}
@SuppressWarnings("unchecked")
Iterator<PGPSecretKey> itr = keyRing.getSecretKeys();
while (itr.hasNext()) {
keys.add(itr.next());
}
}
}
} catch (IOException e) {
}
return keys;
}
/**
* Convert from byte[] to PGPSecretKey
* <p/>
* Singles keys are encoded as keyRings with one single key in it by Bouncy Castle
*
* @param keyBytes
* @return
*/
public static PGPSecretKey BytesToPGPSecretKey(byte[] keyBytes) {
PGPObjectFactory factory = new PGPObjectFactory(keyBytes);
Object obj = null;
try {
obj = factory.nextObject();
} catch (IOException e) {
Log.e(Constants.TAG, "Error while converting to PGPSecretKey!", e);
}
PGPSecretKey secKey = null;
if (obj instanceof PGPSecretKey) {
if ((secKey = (PGPSecretKey) obj) == null) {
Log.e(Constants.TAG, "No keys given!");
}
} else if (obj instanceof PGPSecretKeyRing) { //master keys are sent as keyrings
PGPSecretKeyRing keyRing = null;
if ((keyRing = (PGPSecretKeyRing) obj) == null) {
Log.e(Constants.TAG, "No keys given!");
}
secKey = keyRing.getSecretKey();
}
return secKey;
}
/**
* Convert from byte[] to PGPSignature
*
* @param sigBytes
* @return
*/
public static PGPSignature BytesToPGPSignature(byte[] sigBytes) {
PGPObjectFactory factory = new PGPObjectFactory(sigBytes);
PGPSignatureList signatures = null;
try {
if ((signatures = (PGPSignatureList) factory.nextObject()) == null || signatures.isEmpty()) {
Log.e(Constants.TAG, "No signatures given!");
return null;
}
} catch (IOException e) {
Log.e(Constants.TAG, "Error while converting to PGPSignature!", e);
return null;
}
return signatures.get(0);
}
/**
* Convert from ArrayList<PGPSecretKey> to byte[]
*
* @param keys
* @return
*/
public static byte[] PGPSecretKeyArrayListToBytes(ArrayList<PGPSecretKey> keys) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
for (PGPSecretKey key : keys) {
try {
key.encode(os);
} catch (IOException e) {
Log.e(Constants.TAG, "Error while converting ArrayList<PGPSecretKey> to byte[]!", e);
}
}
return os.toByteArray();
}
/**
* Convert from PGPSecretKey to byte[]
*
* @param key
* @return
*/
public static byte[] PGPSecretKeyToBytes(PGPSecretKey key) {
try {
return key.getEncoded();
} catch (IOException e) {
Log.e(Constants.TAG, "Encoding failed", e);
return null;
}
}
/**
* Convert from PGPSecretKeyRing to byte[]
*
* @param keyRing
* @return
*/
public static byte[] PGPSecretKeyRingToBytes(PGPSecretKeyRing keyRing) {
try {
return keyRing.getEncoded();
} catch (IOException e) {
Log.e(Constants.TAG, "Encoding failed", e);
return null;
}
}
}
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