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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.commons.crypto.cipher;
import java.nio.ByteBuffer;
import java.security.GeneralSecurityException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Properties;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.ShortBufferException;
import org.apache.commons.crypto.utils.Utils;
/**
* Implements the {@link CryptoCipher} using JCE provider.
*/
class JceCipher implements CryptoCipher {
private final Cipher cipher;
/**
* Constructs a {@link CryptoCipher} based on JCE Cipher {@link Cipher}.
*
* @param props properties for JCE cipher (only uses {@link CryptoCipherFactory#JCE_PROVIDER_KEY})
* @param transformation transformation for JCE cipher (algorithm/mode/padding)
* @throws GeneralSecurityException if JCE cipher initialize failed
*/
// N.B. this class is not public/protected so does not appear in the main Javadoc
// Please ensure that property use is documented in the enum CryptoRandomFactory.RandomProvider
public JceCipher(Properties props, String transformation)
throws GeneralSecurityException {
final String provider = props.getProperty(CryptoCipherFactory.JCE_PROVIDER_KEY);
if (provider == null || provider.isEmpty()) {
cipher = Cipher.getInstance(transformation);
} else {
cipher = Cipher.getInstance(transformation, provider);
}
}
/**
* Returns the block size (in bytes).
*
* @return the block size (in bytes), or 0 if the underlying algorithm is
* not a block cipher
*/
@Override
public final int getBlockSize() {
return cipher.getBlockSize();
}
/**
* Returns the algorithm name of this {@code CryptoCipher} object.
*
* This is the same name that was specified in one of the
* {@code CryptoCipherFactory#getInstance} calls that created this
* {@code CryptoCipher} object..
*
* @return the algorithm name of this {@code CryptoCipher} object.
*/
@Override
public String getAlgorithm() {
return cipher.getAlgorithm();
}
/**
* Initializes the cipher with mode, key and iv.
*
* @param mode {@link Cipher#ENCRYPT_MODE} or {@link Cipher#DECRYPT_MODE}
* @param key crypto key for the cipher
* @param params the algorithm parameters
* @throws InvalidAlgorithmParameterException if the given algorithm
* parameters are inappropriate for this cipher, or this cipher
* requires algorithm parameters and params is null, or
* the given algorithm parameters imply a cryptographic strength
* that would exceed the legal limits (as determined from the
* configured jurisdiction policy files).
*/
@Override
public void init(int mode, Key key, AlgorithmParameterSpec params)
throws InvalidKeyException, InvalidAlgorithmParameterException {
Utils.checkNotNull(key);
Utils.checkNotNull(params);
// Jce uses the javax.crypto.Cipher modes; no need to convert the input
cipher.init(mode, key, params);
}
/**
* Continues a multiple-part encryption/decryption operation. The data is
* encrypted or decrypted, depending on how this cipher was initialized.
*
* @param inBuffer the input ByteBuffer
* @param outBuffer the output ByteBuffer
* @return int number of bytes stored in output
* @throws ShortBufferException if there is insufficient space in the output
* buffer
*/
@Override
public int update(ByteBuffer inBuffer, ByteBuffer outBuffer)
throws ShortBufferException {
return cipher.update(inBuffer, outBuffer);
}
/**
* Continues a multiple-part encryption/decryption operation. The data is
* encrypted or decrypted, depending on how this cipher was initialized.
*
* @param input the input byte array
* @param inputOffset the offset in input where the input starts
* @param inputLen the input length
* @param output the byte array for the result
* @param outputOffset the offset in output where the result is stored
* @return the number of bytes stored in output
* @throws ShortBufferException if there is insufficient space in the output
* byte array
*/
@Override
public int update(byte[] input, int inputOffset, int inputLen,
byte[] output, int outputOffset) throws ShortBufferException {
return cipher
.update(input, inputOffset, inputLen, output, outputOffset);
}
/**
* Encrypts or decrypts data in a single-part operation, or finishes a
* multiple-part operation. The data is encrypted or decrypted, depending on
* how this cipher was initialized.
*
* @param inBuffer the input ByteBuffer
* @param outBuffer the output ByteBuffer
* @return int number of bytes stored in output
* @throws BadPaddingException if this cipher is in decryption mode, and
* (un)padding has been requested, but the decrypted data is not
* bounded by the appropriate padding bytes
* @throws IllegalBlockSizeException if this cipher is a block cipher, no
* padding has been requested (only in encryption mode), and the
* total input length of the data processed by this cipher is not a
* multiple of block size; or if this encryption algorithm is unable
* to process the input data provided.
* @throws ShortBufferException if the given output buffer is too small to
* hold the result
*/
@Override
public int doFinal(ByteBuffer inBuffer, ByteBuffer outBuffer)
throws ShortBufferException, IllegalBlockSizeException,
BadPaddingException {
return cipher.doFinal(inBuffer, outBuffer);
}
/**
* Encrypts or decrypts data in a single-part operation, or finishes a
* multiple-part operation.
*
* @param input the input byte array
* @param inputOffset the offset in input where the input starts
* @param inputLen the input length
* @param output the byte array for the result
* @param outputOffset the offset in output where the result is stored
* @return the number of bytes stored in output
* @throws ShortBufferException if the given output byte array is too small
* to hold the result
* @throws BadPaddingException if this cipher is in decryption mode, and
* (un)padding has been requested, but the decrypted data is not
* bounded by the appropriate padding bytes
* @throws IllegalBlockSizeException if this cipher is a block cipher, no
* padding has been requested (only in encryption mode), and the
* total input length of the data processed by this cipher is not a
* multiple of block size; or if this encryption algorithm is unable
* to process the input data provided.
*/
@Override
public int doFinal(byte[] input, int inputOffset, int inputLen,
byte[] output, int outputOffset) throws ShortBufferException,
IllegalBlockSizeException, BadPaddingException {
return cipher.doFinal(input, inputOffset, inputLen, output,
outputOffset);
}
/**
* Closes Jce cipher.
*/
@Override
public void close() {
// Do nothing
}
}