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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2013-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 com.amazonaws.services.s3.internal.crypto;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;

class AesGcm extends ContentCryptoScheme {
    @Override String getKeyGeneratorAlgorithm() { return "AES"; }
    @Override String getCipherAlgorithm() { return "AES/GCM/NoPadding"; }
    @Override int getKeyLengthInBits() { return 256; }
    @Override int getBlockSizeInBytes() { return 16; }
    @Override int getIVLengthInBytes() { return 12; }
    @Override long getMaxPlaintextSize() { return MAX_GCM_BYTES; }
    /**
     * Used to explicitly record the tag length in S3 for interoperability
     * with other services.
     */
    @Override int getTagLengthInBits() { return 128; }
    /**
     * Currently only Bouncy Castle can support the AES/GCM cipher in
     * Java 6 without having to use the AEAD API in Java 7+.
     */
    @Override String getSpecificCipherProvider() { return "BC"; }

    @Override
    CipherLite createAuxillaryCipher(SecretKey cek, byte[] ivOrig,
            int cipherMode, Provider securityProvider, long startingBytePos)
            throws InvalidKeyException, NoSuchAlgorithmException,
            NoSuchProviderException, NoSuchPaddingException,
            InvalidAlgorithmParameterException {
        byte[] iv = AES_CTR.adjustIV(ivOrig, startingBytePos);
        return AES_CTR.createCipherLite(cek, iv, cipherMode, securityProvider);
    }

    @Override
    protected CipherLite newCipherLite(Cipher cipher,  SecretKey cek, int cipherMode) {
        return new GCMCipherLite(cipher, cek, cipherMode);
    }
}