public GenericKey generateUnwrappedKey(
AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedKey) throws OperatorException {
try {
Cipher keyCipher =
helper.createSymmetricWrapper(this.getAlgorithmIdentifier().getAlgorithm());
keyCipher.init(Cipher.UNWRAP_MODE, secretKey);
return new JceGenericKey(
encryptedKeyAlgorithm,
keyCipher.unwrap(
encryptedKey,
helper.getKeyAlgorithmName(encryptedKeyAlgorithm.getAlgorithm()),
Cipher.SECRET_KEY));
} catch (InvalidKeyException e) {
throw new OperatorException("key invalid in message.", e);
} catch (NoSuchAlgorithmException e) {
throw new OperatorException("can't find algorithm.", e);
}
}
public byte[] generateWrappedKey(GenericKey encryptionKey) throws OperatorException {
Key contentEncryptionKeySpec = OperatorUtils.getJceKey(encryptionKey);
Cipher keyEncryptionCipher =
helper.createSymmetricWrapper(this.getAlgorithmIdentifier().getAlgorithm());
try {
keyEncryptionCipher.init(Cipher.WRAP_MODE, wrappingKey, random);
return keyEncryptionCipher.wrap(contentEncryptionKeySpec);
} catch (InvalidKeyException e) {
throw new OperatorException("cannot wrap key: " + e.getMessage(), e);
} catch (GeneralSecurityException e) {
throw new OperatorException("cannot wrap key: " + e.getMessage(), e);
}
}
