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to you under the Apache License, Version 2.0 (the
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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.Objects;
import java.util.Properties;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.ShortBufferException;

Implements the CryptoCipher using JCE provider. /**
 * Implements the {@link CryptoCipher} using JCE provider.
 */
class JceCipher implements CryptoCipher {
    private final Cipher cipher;

    
Constructs a CryptoCipher based on JCE Cipher Cipher. 
Params:
props –  properties for JCE cipher (only uses CryptoCipherFactory.JCE_PROVIDER_KEY)
transformation –  transformation for JCE cipher (algorithm/mode/padding)
Throws:
GeneralSecurityException – if JCE cipher initialize failed/**
     * 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(final Properties props, final 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).
Returns:
the block size (in bytes), or 0 if the underlying algorithm is
not a block cipher/**
     * 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 CryptoCipher object. 
This is the same name that was specified in one of the CryptoCipherFactory#getInstance calls that created this CryptoCipher object.. 
Returns:
the algorithm name of this CryptoCipher object./**
     * Returns the algorithm name of this {@code CryptoCipher} object.
     *
     * <p>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.
Params:
mode – Cipher.ENCRYPT_MODE or Cipher.DECRYPT_MODE
key – crypto key for the cipher
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)./**
     * 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 {@code 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(final int mode, final Key key, final AlgorithmParameterSpec params)
            throws InvalidKeyException, InvalidAlgorithmParameterException {
        Objects.requireNonNull(key, "key");
        Objects.requireNonNull(params, "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.
Params:
inBuffer – the input ByteBuffer
outBuffer – the output ByteBuffer
Throws:
ShortBufferException – if there is insufficient space in the output
        buffer
Returns:
int number of bytes stored in output/**
     * 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 {@code output}
     * @throws ShortBufferException if there is insufficient space in the output
     *         buffer
     */
    @Override
    public int update(final ByteBuffer inBuffer, final 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.
Params:
input – the input byte array
inputOffset – the offset in input where the input starts
inputLen – the input length
output – the byte array for the result
outputOffset – the offset in output where the result is stored
Throws:
ShortBufferException – if there is insufficient space in the output
        byte array
Returns:
the number of bytes stored in output/**
     * 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(final byte[] input, final int inputOffset, final int inputLen,
            final byte[] output, final 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.
Params:
inBuffer – the input ByteBuffer
outBuffer – the output ByteBuffer
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
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.
ShortBufferException – if the given output buffer is too small to
        hold the result
Returns:
int number of bytes stored in output/**
     * 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 {@code 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(final ByteBuffer inBuffer, final 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.
Params:
input – the input byte array
inputOffset – the offset in input where the input starts
inputLen – the input length
output – the byte array for the result
outputOffset – the offset in output where the result is stored
Throws:
ShortBufferException – if the given output byte array is too small
        to hold the result
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
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.
Returns:
the number of bytes stored in output/**
     * 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(final byte[] input, final int inputOffset, final int inputLen,
            final byte[] output, final int outputOffset) throws ShortBufferException,
            IllegalBlockSizeException, BadPaddingException {
        return cipher.doFinal(input, inputOffset, inputLen, output,
                outputOffset);
    }


    
Continues a multi-part update of the Additional Authentication
Data (AAD).
 Calls to this method provide AAD to the cipher when operating in modes such as AEAD (GCM/CCM). If this cipher is operating in either GCM or CCM mode, all AAD must be supplied before beginning operations on the ciphertext (via the update and doFinal methods). 
Params:
aad – the buffer containing the Additional Authentication Data
Throws:
IllegalArgumentException – if the aad byte array is null
IllegalStateException – if this cipher is in a wrong state (e.g., has not been initialized), does not accept AAD, or if operating in either GCM or CCM mode and one of the update methods has already been called for the active encryption/decryption operation
UnsupportedOperationException – if JCE's implementation does not
support such operation/**
     * Continues a multi-part update of the Additional Authentication
     * Data (AAD).
     * <p>
     * Calls to this method provide AAD to the cipher when operating in
     * modes such as AEAD (GCM/CCM).  If this cipher is operating in
     * either GCM or CCM mode, all AAD must be supplied before beginning
     * operations on the ciphertext (via the {@code update} and
     * {@code doFinal} methods).
     *
     * @param aad the buffer containing the Additional Authentication Data
     *
     * @throws IllegalArgumentException if the {@code aad}
     * byte array is null
     * @throws IllegalStateException if this cipher is in a wrong state
     * (e.g., has not been initialized), does not accept AAD, or if
     * operating in either GCM or CCM mode and one of the {@code update}
     * methods has already been called for the active
     * encryption/decryption operation
     * @throws UnsupportedOperationException if JCE's implementation does not
     * support such operation
     */
    @Override
    public void updateAAD(final byte[] aad) {
        cipher.updateAAD(aad);
    }

    
Continues a multi-part update of the Additional Authentication
Data (AAD).
 Calls to this method provide AAD to the cipher when operating in modes such as AEAD (GCM/CCM). If this cipher is operating in either GCM or CCM mode, all AAD must be supplied before beginning operations on the ciphertext (via the update and doFinal methods). 
Params:
aad – the buffer containing the Additional Authentication Data
Throws:
IllegalArgumentException – if the aad byte array is null
IllegalStateException – if this cipher is in a wrong state (e.g., has not been initialized), does not accept AAD, or if operating in either GCM or CCM mode and one of the update methods has already been called for the active encryption/decryption operation
UnsupportedOperationException – if JCE's implementation does not
support such operation/**
     * Continues a multi-part update of the Additional Authentication
     * Data (AAD).
     * <p>
     * Calls to this method provide AAD to the cipher when operating in
     * modes such as AEAD (GCM/CCM).  If this cipher is operating in
     * either GCM or CCM mode, all AAD must be supplied before beginning
     * operations on the ciphertext (via the {@code update} and
     * {@code doFinal} methods).
     *
     * @param aad the buffer containing the Additional Authentication Data
     *
     * @throws IllegalArgumentException if the {@code aad}
     * byte array is null
     * @throws IllegalStateException if this cipher is in a wrong state
     * (e.g., has not been initialized), does not accept AAD, or if
     * operating in either GCM or CCM mode and one of the {@code update}
     * methods has already been called for the active
     * encryption/decryption operation
     * @throws UnsupportedOperationException if JCE's implementation does not
     * support such operation
     */
    @Override
    public void updateAAD(final ByteBuffer aad) {
        cipher.updateAAD(aad);
    }


    
Closes Jce cipher.
/**
     * Closes Jce cipher.
     */
    @Override
    public void close() {
        // Do nothing
    }
}