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/*
* Copyright (C) 2012 Dominik Schürmann <dominik@dominikschuermann.de>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.sufficientlysecure.keychain.helper;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import org.spongycastle.openpgp.PGPKeyRing;
import org.spongycastle.openpgp.PGPObjectFactory;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.PGPSecretKeyRing;
import org.spongycastle.openpgp.PGPUtil;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.util.Log;
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) {
PGPSecretKeyRing keyRing = (PGPSecretKeyRing) BytesToPGPKeyRing(keysBytes);
ArrayList<PGPSecretKey> keys = new ArrayList<PGPSecretKey>();
@SuppressWarnings("unchecked")
Iterator<PGPSecretKey> itr = keyRing.getSecretKeys();
while (itr.hasNext()) {
keys.add(itr.next());
}
return keys;
}
/**
* Convert from byte[] to PGPSecretKey
*
* Singles keys are encoded as keyRings with one single key in it by Bouncy Castle
*
* @param keysBytes
* @return
*/
public static PGPSecretKey BytesToPGPSecretKey(byte[] keyBytes) {
PGPSecretKey key = BytesToPGPSecretKeyList(keyBytes).get(0);
return key;
}
/**
* 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 keysBytes
* @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 keysBytes
* @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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