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/* Copyright 2016 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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.
*/
/* functions for encrypting and decrypting pickled representations of objects */
#ifndef OLM_PICKLE_ENCODING_H_
#define OLM_PICKLE_ENCODING_H_
#include <stddef.h>
#include <stdint.h>
#include "olm/error.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* Get the number of bytes needed to encode a pickle of the length given
*/
size_t _olm_enc_output_length(size_t raw_length);
/**
* Get the point in the output buffer that the raw pickle should be written to.
*
* In order that we can use the same buffer for the raw pickle, and the encoded
* pickle, the raw pickle needs to be written at the end of the buffer. (The
* base-64 encoding would otherwise overwrite the end of the input before it
* was encoded.)
*/
uint8_t *_olm_enc_output_pos(uint8_t * output, size_t raw_length);
/**
* Encrypt and encode the given pickle in-situ.
*
* The raw pickle should have been written to enc_output_pos(pickle,
* raw_length).
*
* Returns the number of bytes in the encoded pickle.
*/
size_t _olm_enc_output(
uint8_t const * key, size_t key_length,
uint8_t *pickle, size_t raw_length
);
/**
* Decode and decrypt the given pickle in-situ.
*
* Returns the number of bytes in the decoded pickle, or olm_error() on error,
* in which case *last_error will be updated, if last_error is non-NULL.
*/
size_t _olm_enc_input(
uint8_t const * key, size_t key_length,
uint8_t * input, size_t b64_length,
enum OlmErrorCode * last_error
);
#ifdef __cplusplus
} // extern "C"
#endif
#endif /* OLM_PICKLE_ENCODING_H_ */
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