src/S3/Crypto/S3EncryptionClient.php [289:342]:
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                    );
                    return $result;
                }
            )->then(
                function ($result) use ($saveAs) {
                    if (!empty($saveAs)) {
                        file_put_contents(
                            $saveAs,
                            (string)$result['Body'],
                            LOCK_EX
                        );
                    }
                    return $result;
                }
            );

        return $promise;
    }

    /**
     * Retrieves an object from S3 and decrypts the data in the 'Body' field.
     *
     * @param array $args Arguments for retrieving an object from S3 via
     *                    GetObject and decrypting it.
     *
     * The required configuration argument is as follows:
     *
     * - @MaterialsProvider: (MaterialsProvider) Provides Cek, Iv, and Cek
     *   encrypting/decrypting for decryption metadata. May have data loaded
     *   from the MetadataEnvelope upon decryption.
     *
     * The optional configuration arguments are as follows:
     *
     * - SaveAs: (string) The path to a file on disk to save the decrypted
     *   object data. This will be handled by file_put_contents instead of the
     *   Guzzle sink.
     * - @InstructionFileSuffix: (string|null) Suffix used when looking for an
     *   instruction file if an InstructionFileMetadataHandler was detected.
     * - @CipherOptions: (array) Cipher options for encrypting data. A Cipher
     *   is required. Accepts the following options:
     *       - Aad: (string) Additional authentication data. This option is
     *            passed directly to OpenSSL when using gcm. It is ignored when
     *            using cbc.
     *
     * @return \Aws\Result GetObject call result with the 'Body' field
     *                     wrapped in a decryption stream with its metadata
     *                     information.
     *
     * @throws \InvalidArgumentException Thrown when arguments above are not
     *                                   passed or are passed incorrectly.
     */
    public function getObject(array $args)
    {
        return $this->getObjectAsync($args)->wait();
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src/S3/Crypto/S3EncryptionClientV2.php [385:448]:
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                    );
                    return $result;
                }
            )->then(
                function ($result) use ($saveAs) {
                    if (!empty($saveAs)) {
                        file_put_contents(
                            $saveAs,
                            (string)$result['Body'],
                            LOCK_EX
                        );
                    }
                    return $result;
                }
            );

        return $promise;
    }

    /**
     * Retrieves an object from S3 and decrypts the data in the 'Body' field.
     *
     * @param array $args Arguments for retrieving an object from S3 via
     *                    GetObject and decrypting it.
     *
     * The required configuration argument is as follows:
     *
     * - @MaterialsProvider: (MaterialsProviderInterface) Provides Cek, Iv, and Cek
     *   encrypting/decrypting for decryption metadata. May have data loaded
     *   from the MetadataEnvelope upon decryption.
     * - @SecurityProfile: (string) Must be set to 'V2' or 'V2_AND_LEGACY'.
     *      - 'V2' indicates that only objects encrypted with S3EncryptionClientV2
     *        content encryption and key wrap schemas are able to be decrypted.
     *      - 'V2_AND_LEGACY' indicates that objects encrypted with both
     *        S3EncryptionClientV2 and older legacy encryption clients are able
     *        to be decrypted.
     *
     * The optional configuration arguments are as follows:
     *
     * - SaveAs: (string) The path to a file on disk to save the decrypted
     *   object data. This will be handled by file_put_contents instead of the
     *   Guzzle sink.
     * - @InstructionFileSuffix: (string|null) Suffix used when looking for an
     *   instruction file if an InstructionFileMetadataHandler was detected.
     * - @CipherOptions: (array) Cipher options for encrypting data. A Cipher
     *   is required. Accepts the following options:
     *       - Aad: (string) Additional authentication data. This option is
     *            passed directly to OpenSSL when using gcm. It is ignored when
     *            using cbc.
     * - @KmsAllowDecryptWithAnyCmk: (bool) This allows decryption with
     *   KMS materials for any KMS key ID, instead of needing the KMS key ID to
     *   be specified and provided to the decrypt operation. Ignored for non-KMS
     *   materials providers. Defaults to false.
     *
     * @return \Aws\Result GetObject call result with the 'Body' field
     *                     wrapped in a decryption stream with its metadata
     *                     information.
     *
     * @throws \InvalidArgumentException Thrown when arguments above are not
     *                                   passed or are passed incorrectly.
     */
    public function getObject(array $args)
    {
        return $this->getObjectAsync($args)->wait();
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