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de.mhus.osgi.crypt.bc.BouncyAesWithRsaCipher Maven / Gradle / Ivy
/**
* Copyright 2018 Mike Hummel
*
* 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 de.mhus.osgi.crypt.bc;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.UUID;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import org.osgi.service.component.ComponentContext;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import de.mhus.lib.core.IProperties;
import de.mhus.lib.core.MApi;
import de.mhus.lib.core.MLog;
import de.mhus.lib.core.MProperties;
import de.mhus.lib.core.MString;
import de.mhus.lib.core.crypt.Blowfish;
import de.mhus.lib.core.crypt.MBouncy;
import de.mhus.lib.core.crypt.MRandom;
import de.mhus.lib.core.crypt.pem.PemBlock;
import de.mhus.lib.core.crypt.pem.PemBlockModel;
import de.mhus.lib.core.crypt.pem.PemKey;
import de.mhus.lib.core.crypt.pem.PemKeyPair;
import de.mhus.lib.core.crypt.pem.PemPair;
import de.mhus.lib.core.crypt.pem.PemPriv;
import de.mhus.lib.core.crypt.pem.PemPub;
import de.mhus.lib.core.util.Base64;
import de.mhus.lib.errors.MException;
import de.mhus.osgi.crypt.api.CryptApi;
import de.mhus.osgi.crypt.api.cipher.CipherProvider;
import de.mhus.osgi.crypt.api.util.CryptUtil;
// https://bouncycastle-pgp-cookbook.blogspot.de/2013/01/generating-rsa-keys.html
@Component(property="cipher=AESWITHRSA-BC",immediate=true) // Bouncycastle RSA
public class BouncyAesWithRsaCipher extends MLog implements CipherProvider {
private final String NAME = "AESwithRSA-BC";
@Activate
public void doActivate(ComponentContext ctx) {
MBouncy.init();
}
@Override
public PemBlock encrypt(PemPub key, String content) throws MException {
try {
// prepare AES key
int aesLength = key.getInt("AesLength", 128);
if (aesLength != 128 && aesLength != 256) {
throw new MException("AES length not valid, use 128 or 256",aesLength);
}
int aesSize = aesLength == 128 ? 16 : 32;
byte[] aesKey = new byte[aesSize];
MRandom random = MApi.lookup(MRandom.class);
for (int i = 0; i < aesKey.length; i++)
aesKey[i] = random.getByte();
// prepare RSA
byte[] encKey = key.getBytesBlock();
X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(encKey);
KeyFactory keyFactory = KeyFactory.getInstance("RSA", "BC");
PublicKey pubKey = keyFactory.generatePublic(pubKeySpec);
Cipher cipher = Cipher.getInstance("RSA", "BC");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
String stringEncoding = "utf-8";
// encode AES key
byte[] aesKeyEncoded = cipher.doFinal(aesKey, 0, aesKey.length);
// encode content
byte[] dataToSend = content.getBytes(stringEncoding);
Cipher c = Cipher.getInstance("AES", "BC");
SecretKeySpec k = new SecretKeySpec(aesKey, "AES");
c.init(Cipher.ENCRYPT_MODE, k);
byte[] encryptedData = c.doFinal(dataToSend);
PemBlockModel out = new PemBlockModel(PemBlock.BLOCK_CIPHER, encryptedData);
CryptUtil.prepareCipherOut(key, out, getName(), stringEncoding);
out.setInt("AesLength", aesLength);
out.setString("AesKey", Base64.encode(aesKeyEncoded));
return out;
} catch (Throwable t) {
if (t instanceof MException) throw (MException)t;
throw new MException(t);
}
}
@Override
public String decrypt(PemPriv key, PemBlock encoded, String passphrase) throws MException {
try {
byte[] encKey = key.getBytesBlock();
if (MString.isSet(passphrase))
encKey = Blowfish.decrypt(encKey, passphrase);
PKCS8EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec(encKey);
KeyFactory keyFactory = KeyFactory.getInstance("RSA", "BC");
PrivateKey privKey = keyFactory.generatePrivate(privKeySpec);
Cipher cipher = Cipher.getInstance("RSA", "BC");
cipher.init(Cipher.DECRYPT_MODE, privKey);
String aesEncKey = encoded.getString("AesKey");
byte[] b = Base64.decode(aesEncKey);
byte[] aesKey = cipher.doFinal(b, 0, b.length);
byte[] data = encoded.getBytesBlock();
Cipher c = Cipher.getInstance("AES");
SecretKeySpec k = new SecretKeySpec(aesKey, "AES");
c.init(Cipher.DECRYPT_MODE, k);
byte[] enc = c.doFinal(data);
String stringEncoding = encoded.getString(PemBlock.STRING_ENCODING, "utf-8");
return new String(enc, stringEncoding);
} catch (Exception e) {
if (e instanceof MException) throw (MException)e;
throw new MException(e);
}
}
@Override
public String getName() {
return NAME;
}
@Override
public PemPair createKeys(IProperties properties) throws MException {
try {
if (properties == null) properties = new MProperties();
int len = properties.getInt(CryptApi.LENGTH, 1024);
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA", "BC");
MRandom random = MApi.lookup(MRandom.class);
keyGen.initialize(len, random.getSecureRandom());
KeyPair pair = keyGen.generateKeyPair();
PrivateKey priv = pair.getPrivate();
PublicKey pub = pair.getPublic();
UUID privId = UUID.randomUUID();
UUID pubId = UUID.randomUUID();
byte[] privBytes = priv.getEncoded();
String passphrase = properties.getString(CryptApi.PASSPHRASE, null);
if (MString.isSet(passphrase))
privBytes = Blowfish.encrypt(privBytes, passphrase);
PemKey xpub = new PemKey(PemBlock.BLOCK_PUB , pub.getEncoded(), false )
.set(PemBlock.METHOD, getName())
.set(PemBlock.LENGTH, len)
.set(PemBlock.FORMAT, pub.getFormat())
.set(PemBlock.IDENT, pubId)
.set(PemBlock.PRIV_ID, privId);
PemKey xpriv = new PemKey(PemBlock.BLOCK_PRIV, privBytes, true )
.set(PemBlock.METHOD, getName())
.set(PemBlock.LENGTH, len)
.set(PemBlock.FORMAT, priv.getFormat())
.set(PemBlock.IDENT, privId)
.set(PemBlock.PUB_ID, pubId);
if (MString.isSet(passphrase))
xpriv.set(PemBlock.ENCRYPTED, PemBlock.ENC_BLOWFISH);
privBytes = null;
return new PemKeyPair(xpriv, xpub);
} catch (Exception e) {
throw new MException(e);
}
}
}
