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/* Copyright 2021 The Matrix.org Foundation C.I.C.
*
* 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.
*/
#include <string.h>
#include "olm/pickle_encoding.h"
size_t add_junk_suffix_to_pickle(void const * key, size_t key_length,
void * pickled, size_t pickled_length, size_t junk_length)
{
size_t raw_length = _olm_enc_input((uint8_t const *) key, key_length,
(uint8_t *) pickled, pickled_length, nullptr);
/* Insert junk. */
size_t new_length = raw_length + junk_length;
uint8_t * pos = (uint8_t *) pickled + raw_length;
while (junk_length--) {
*pos++ = 255;
}
void * dest = _olm_enc_output_pos((uint8_t *) pickled, new_length);
memmove(dest, pickled, new_length);
return _olm_enc_output(
(uint8_t const *) key, key_length, (uint8_t *) pickled, new_length);
}
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