38 lines
1.3 KiB
C++
38 lines
1.3 KiB
C++
/* Copyright 2021 The Matrix.org Foundation C.I.C.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include "olm/pickle_encoding.h"
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size_t add_junk_suffix_to_pickle(void const * key, size_t key_length,
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void * pickled, size_t pickled_length, size_t junk_length)
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{
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size_t raw_length = _olm_enc_input((uint8_t const *) key, key_length,
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(uint8_t *) pickled, pickled_length, nullptr);
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/* Insert junk. */
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size_t new_length = raw_length + junk_length;
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uint8_t * pos = (uint8_t *) pickled + raw_length;
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while (junk_length--) {
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*pos++ = 255;
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}
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void * dest = _olm_enc_output_pos((uint8_t *) pickled, new_length);
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memmove(dest, pickled, new_length);
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return _olm_enc_output(
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(uint8_t const *) key, key_length, (uint8_t *) pickled, new_length);
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}
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