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/*
* Copyright (c) 2021, [Ribose Inc](https://www.ribose.com).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef RNP_CIPHER_HPP
#define RNP_CIPHER_HPP
#include <memory>
#include <string>
#include <repgp/repgp_def.h>
// Note: for AEAD modes we append the authentication tag to the ciphertext as in RFC 5116
class Cipher {
public:
// the tag size should be 0 for non-AEAD and must be non-zero for AEAD modes (no default)
static std::unique_ptr<Cipher> encryption(pgp_symm_alg_t cipher,
pgp_cipher_mode_t mode,
size_t tag_size = 0,
bool disable_padding = false);
static std::unique_ptr<Cipher> decryption(pgp_symm_alg_t cipher,
pgp_cipher_mode_t mode,
size_t tag_size = 0,
bool disable_padding = false);
virtual bool set_key(const uint8_t *key, size_t key_length) = 0;
virtual bool set_iv(const uint8_t *iv, size_t iv_length) = 0;
// only valid for AEAD modes
virtual bool set_ad(const uint8_t *ad, size_t ad_length) = 0;
virtual size_t block_size() const;
virtual size_t update_granularity() const = 0;
// input_length must be a multiple of update_granularity
virtual bool update(uint8_t * output,
size_t output_length,
size_t * output_written,
const uint8_t *input,
size_t input_length,
size_t * input_consumed) = 0;
/**
* @brief Finalize cipher. For AEAD mode, depending on backend, may require whole
* authentication tag to be present in input.
*/
virtual bool finish(uint8_t * output,
size_t output_length,
size_t * output_written,
const uint8_t *input,
size_t input_length,
size_t * input_consumed) = 0;
virtual ~Cipher();
protected:
Cipher(pgp_symm_alg_t alg);
pgp_symm_alg_t m_alg;
};
#endif
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