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<?php
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namespace Aws\Crypto\Cipher;
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interface CipherMethod
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{
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    /**
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     * Returns an identifier recognizable by `openssl_*` functions, such as
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     * `aes-256-cbc` or `aes-128-ctr`.
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     *
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     * @return string
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     */
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    public function getOpenSslName();
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    /**
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     * Returns an AES recognizable name, such as 'AES/GCM/NoPadding'.
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     *
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     * @return string
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     */
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    public function getAesName();
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    /**
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     * Returns the IV that should be used to initialize the next block in
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     * encrypt or decrypt.
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     *
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     * @return string
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     */
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    public function getCurrentIv();
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    /**
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     * Indicates whether the cipher method used with this IV requires padding
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     * the final block to make sure the plaintext is evenly divisible by the
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     * block size.
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     *
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     * @return boolean
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     */
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    public function requiresPadding();
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    /**
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     * Adjust the return of this::getCurrentIv to reflect a seek performed on
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     * the encryption stream using this IV object.
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     *
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     * @param int $offset
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     * @param int $whence
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     *
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     * @throws LogicException   Thrown if the requested seek is not supported by
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     *                          this IV implementation. For example, a CBC IV
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     *                          only supports a full rewind ($offset === 0 &&
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     *                          $whence === SEEK_SET)
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     */
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    public function seek($offset, $whence = SEEK_SET);
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    /**
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     * Take account of the last cipher text block to adjust the return of
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     * this::getCurrentIv
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     *
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     * @param string $cipherTextBlock
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     */
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    public function update($cipherTextBlock);
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}