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/**
* Copyright (c) 2013-2014 Philipp Jakubeit, Signe Rüsch, Dominik Schürmann
*
* Licensed under the Bouncy Castle License (MIT license). See LICENSE file for details.
*/
package org.spongycastle.openpgp.operator.jcajce;
import org.spongycastle.bcpg.PublicKeyAlgorithmTags;
import org.spongycastle.jcajce.util.DefaultJcaJceHelper;
import org.spongycastle.jcajce.util.NamedJcaJceHelper;
import org.spongycastle.jcajce.util.ProviderJcaJceHelper;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPublicKey;
import org.spongycastle.openpgp.operator.PGPDataDecryptor;
import org.spongycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
import java.security.Provider;
/**
* This class is based on JcePublicKeyDataDecryptorFactoryBuilder
*
*/
public class NfcSyncPublicKeyDataDecryptorFactoryBuilder
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private OperatorHelper contentHelper = new OperatorHelper(new DefaultJcaJceHelper());
private JcaPGPKeyConverter keyConverter = new JcaPGPKeyConverter();
// private JcaPGPDigestCalculatorProviderBuilder digestCalculatorProviderBuilder = new JcaPGPDigestCalculatorProviderBuilder();
// private JcaKeyFingerprintCalculator fingerprintCalculator = new JcaKeyFingerprintCalculator();
public static class NfcInteractionNeeded extends RuntimeException
{
public byte[] encryptedSessionKey;
public NfcInteractionNeeded(byte[] encryptedSessionKey)
{
super("NFC interaction required!");
this.encryptedSessionKey = encryptedSessionKey;
}
}
public NfcSyncPublicKeyDataDecryptorFactoryBuilder()
{
}
/**
* Set the provider object to use for creating cryptographic primitives in the resulting factory the builder produces.
*
* @param provider provider object for cryptographic primitives.
* @return the current builder.
*/
public NfcSyncPublicKeyDataDecryptorFactoryBuilder setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
keyConverter.setProvider(provider);
this.contentHelper = helper;
return this;
}
/**
* Set the provider name to use for creating cryptographic primitives in the resulting factory the builder produces.
*
* @param providerName the name of the provider to reference for cryptographic primitives.
* @return the current builder.
*/
public NfcSyncPublicKeyDataDecryptorFactoryBuilder setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
keyConverter.setProvider(providerName);
this.contentHelper = helper;
return this;
}
public NfcSyncPublicKeyDataDecryptorFactoryBuilder setContentProvider(Provider provider)
{
this.contentHelper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public NfcSyncPublicKeyDataDecryptorFactoryBuilder setContentProvider(String providerName)
{
this.contentHelper = new OperatorHelper(new NamedJcaJceHelper(providerName));
return this;
}
public PublicKeyDataDecryptorFactory build(final byte[] nfcDecrypted) {
return new PublicKeyDataDecryptorFactory()
{
public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData)
throws PGPException
{
if (keyAlgorithm == PublicKeyAlgorithmTags.ECDH)
{
throw new PGPException("ECDH not supported!");
}
return decryptSessionData(keyAlgorithm, secKeyData, nfcDecrypted);
}
public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)
throws PGPException
{
return contentHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key);
}
};
}
// public PublicKeyDataDecryptorFactory build(final PrivateKey privKey)
// {
// return new PublicKeyDataDecryptorFactory()
// {
// public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData)
// throws PGPException
// {
// if (keyAlgorithm == PublicKeyAlgorithmTags.ECDH)
// {
// throw new PGPException("ECDH requires use of PGPPrivateKey for decryption");
// }
// return decryptSessionData(keyAlgorithm, privKey, secKeyData);
// }
//
// public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)
// throws PGPException
// {
// return contentHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key);
// }
// };
// }
// public PublicKeyDataDecryptorFactory build(final PGPPrivateKey privKey, final byte[] nfcDecrypted)
// {
// return new PublicKeyDataDecryptorFactory()
// {
// public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData)
// throws PGPException
// {
// if (keyAlgorithm == PublicKeyAlgorithmTags.ECDH)
// {
// return decryptSessionData(privKey.getPrivateKeyDataPacket(), privKey.getPublicKeyPacket(), secKeyData);
// }
//
// return decryptSessionData(keyAlgorithm, keyConverter.getPrivateKey(privKey), secKeyData, nfcDecrypted);
// }
//
// public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)
// throws PGPException
// {
// return contentHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key);
// }
// };
// }
// private byte[] decryptSessionData(BCPGKey privateKeyPacket, PublicKeyPacket pubKeyData, byte[][] secKeyData)
// throws PGPException
// {
// ECDHPublicBCPGKey ecKey = (ECDHPublicBCPGKey)pubKeyData.getKey();
// X9ECParameters x9Params = NISTNamedCurves.getByOID(ecKey.getCurveOID());
//
// byte[] enc = secKeyData[0];
//
// int pLen = ((((enc[0] & 0xff) << 8) + (enc[1] & 0xff)) + 7) / 8;
// byte[] pEnc = new byte[pLen];
//
// System.arraycopy(enc, 2, pEnc, 0, pLen);
//
// byte[] keyEnc = new byte[enc[pLen + 2]];
//
// System.arraycopy(enc, 2 + pLen + 1, keyEnc, 0, keyEnc.length);
//
// Cipher c = helper.createKeyWrapper(ecKey.getSymmetricKeyAlgorithm());
//
// ECPoint S = x9Params.getCurve().decodePoint(pEnc).multiply(((ECSecretBCPGKey)privateKeyPacket).getX()).normalize();
//
// RFC6637KDFCalculator rfc6637KDFCalculator = new RFC6637KDFCalculator(digestCalculatorProviderBuilder.build().get(ecKey.getHashAlgorithm()), ecKey.getSymmetricKeyAlgorithm());
// Key key = new SecretKeySpec(rfc6637KDFCalculator.createKey(ecKey.getCurveOID(), S, fingerprintCalculator.calculateFingerprint(pubKeyData)), "AESWrap");
//
// try
// {
// c.init(Cipher.UNWRAP_MODE, key);
//
// Key paddedSessionKey = c.unwrap(keyEnc, "Session", Cipher.SECRET_KEY);
//
// return PGPPad.unpadSessionData(paddedSessionKey.getEncoded());
// }
// catch (InvalidKeyException e)
// {
// throw new PGPException("error setting asymmetric cipher", e);
// }
// catch (NoSuchAlgorithmException e)
// {
// throw new PGPException("error setting asymmetric cipher", e);
// }
// }
private byte[] decryptSessionData(int keyAlgorithm, byte[][] secKeyData, byte[] nfcDecrypted)
throws PGPException
{
// Cipher c1 = helper.createPublicKeyCipher(keyAlgorithm);
//
// try
// {
// c1.init(Cipher.DECRYPT_MODE, privKey);
// }
// catch (InvalidKeyException e)
// {
// throw new PGPException("error setting asymmetric cipher", e);
// }
if (keyAlgorithm == PGPPublicKey.RSA_ENCRYPT
|| keyAlgorithm == PGPPublicKey.RSA_GENERAL)
{
byte[] bi = secKeyData[0]; // encoded MPI
if (nfcDecrypted != null) {
// we already have the decrypted bytes from a previous execution, return this!
return nfcDecrypted;
} else {
// catch this when decryptSessionData() is executed and divert digest to card,
// when doing the operation again reuse nfcDecrypted
throw new NfcInteractionNeeded(bi);
}
// c1.update(bi, 2, bi.length - 2);
}
else
{
throw new PGPException("ElGamal not supported!");
// ElGamalKey k = (ElGamalKey)privKey;
// int size = (k.getParameters().getP().bitLength() + 7) / 8;
// byte[] tmp = new byte[size];
//
// byte[] bi = secKeyData[0]; // encoded MPI
// if (bi.length - 2 > size) // leading Zero? Shouldn't happen but...
// {
// c1.update(bi, 3, bi.length - 3);
// }
// else
// {
// System.arraycopy(bi, 2, tmp, tmp.length - (bi.length - 2), bi.length - 2);
// c1.update(tmp);
// }
//
// bi = secKeyData[1]; // encoded MPI
// for (int i = 0; i != tmp.length; i++)
// {
// tmp[i] = 0;
// }
//
// if (bi.length - 2 > size) // leading Zero? Shouldn't happen but...
// {
// c1.update(bi, 3, bi.length - 3);
// }
// else
// {
// System.arraycopy(bi, 2, tmp, tmp.length - (bi.length - 2), bi.length - 2);
// c1.update(tmp);
// }
}
// try
// {
// return c1.doFinal();
// }
// catch (Exception e)
// {
// throw new PGPException("exception decrypting session data", e);
// }
}
}
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