src/S3/Crypto/S3EncryptionClient.php [62:123]:
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        );
    }

    private static function getDefaultStrategy()
    {
        return new HeadersMetadataStrategy();
    }

    /**
     * Encrypts the data in the 'Body' field of $args and promises to upload it
     * to the specified location on S3.
     *
     * @param array $args Arguments for encrypting an object and uploading it
     *                    to S3 via PutObject.
     *
     * The required configuration arguments are as follows:
     *
     * - @MaterialsProvider: (MaterialsProvider) Provides Cek, Iv, and Cek
     *   encrypting/decrypting for encryption metadata.
     * - @CipherOptions: (array) Cipher options for encrypting data. Only the
     *   Cipher option is required. Accepts the following:
     *       - Cipher: (string) cbc|gcm
     *            See also: AbstractCryptoClient::$supportedCiphers. Note that
     *            cbc is deprecated and gcm should be used when possible.
     *       - KeySize: (int) 128|192|256
     *            See also: MaterialsProvider::$supportedKeySizes
     *       - Aad: (string) Additional authentication data. This option is
     *            passed directly to OpenSSL when using gcm. It is ignored when
     *            using cbc. Note if you pass in Aad for gcm encryption, the
     *            PHP SDK will be able to decrypt the resulting object, but other
     *            AWS SDKs may not be able to do so.
     *
     * The optional configuration arguments are as follows:
     *
     * - @MetadataStrategy: (MetadataStrategy|string|null) Strategy for storing
     *   MetadataEnvelope information. Defaults to using a
     *   HeadersMetadataStrategy. Can either be a class implementing
     *   MetadataStrategy, a class name of a predefined strategy, or empty/null
     *   to default.
     * - @InstructionFileSuffix: (string|null) Suffix used when writing to an
     *   instruction file if using an InstructionFileMetadataHandler.
     *
     * @return PromiseInterface
     *
     * @throws \InvalidArgumentException Thrown when arguments above are not
     *                                   passed or are passed incorrectly.
     */
    public function putObjectAsync(array $args)
    {
        $provider = $this->getMaterialsProvider($args);
        unset($args['@MaterialsProvider']);

        $instructionFileSuffix = $this->getInstructionFileSuffix($args);
        unset($args['@InstructionFileSuffix']);

        $strategy = $this->getMetadataStrategy($args, $instructionFileSuffix);
        unset($args['@MetadataStrategy']);

        $envelope = new MetadataEnvelope();

        return Promise\Create::promiseFor($this->encrypt(
            Psr7\Utils::streamFor($args['Body']),
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src/S3/Crypto/S3EncryptionClientV2.php [115:184]:
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        );
    }

    private static function getDefaultStrategy()
    {
        return new HeadersMetadataStrategy();
    }

    /**
     * Encrypts the data in the 'Body' field of $args and promises to upload it
     * to the specified location on S3.
     *
     * Note that for PHP versions of < 7.1, this operation uses an AES-GCM
     * polyfill for encryption since there is no native PHP support. The
     * performance for large inputs will be a lot slower than for PHP 7.1+, so
     * upgrading older PHP version environments may be necessary to use this
     * effectively.
     *
     * @param array $args Arguments for encrypting an object and uploading it
     *                    to S3 via PutObject.
     *
     * The required configuration arguments are as follows:
     *
     * - @MaterialsProvider: (MaterialsProviderV2) Provides Cek, Iv, and Cek
     *   encrypting/decrypting for encryption metadata.
     * - @CipherOptions: (array) Cipher options for encrypting data. Only the
     *   Cipher option is required. Accepts the following:
     *       - Cipher: (string) gcm
     *            See also: AbstractCryptoClientV2::$supportedCiphers
     *       - KeySize: (int) 128|256
     *            See also: MaterialsProvider::$supportedKeySizes
     *       - Aad: (string) Additional authentication data. This option is
     *            passed directly to OpenSSL when using gcm. Note if you pass in
     *            Aad, the PHP SDK will be able to decrypt the resulting object,
     *            but other AWS SDKs may not be able to do so.
     * - @KmsEncryptionContext: (array) Only required if using
     *   KmsMaterialsProviderV2. An associative array of key-value
     *   pairs to be added to the encryption context for KMS key encryption. An
     *   empty array may be passed if no additional context is desired.
     *
     * The optional configuration arguments are as follows:
     *
     * - @MetadataStrategy: (MetadataStrategy|string|null) Strategy for storing
     *   MetadataEnvelope information. Defaults to using a
     *   HeadersMetadataStrategy. Can either be a class implementing
     *   MetadataStrategy, a class name of a predefined strategy, or empty/null
     *   to default.
     * - @InstructionFileSuffix: (string|null) Suffix used when writing to an
     *   instruction file if using an InstructionFileMetadataHandler.
     *
     * @return PromiseInterface
     *
     * @throws \InvalidArgumentException Thrown when arguments above are not
     *                                   passed or are passed incorrectly.
     */
    public function putObjectAsync(array $args)
    {
        $provider = $this->getMaterialsProvider($args);
        unset($args['@MaterialsProvider']);

        $instructionFileSuffix = $this->getInstructionFileSuffix($args);
        unset($args['@InstructionFileSuffix']);

        $strategy = $this->getMetadataStrategy($args, $instructionFileSuffix);
        unset($args['@MetadataStrategy']);

        $envelope = new MetadataEnvelope();

        return Promise\Create::promiseFor($this->encrypt(
            Psr7\Utils::streamFor($args['Body']),
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