mirror of https://git.matrix.org/git/olm.git
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* Copyright 2015 OpenMarket Ltd
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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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/* C-compatible crpyto utility functions. At some point all of crypto.hh will
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* move here.
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*/
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#ifndef OLM_CRYPTO_H_
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#define OLM_CRYPTO_H_
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#include <stdint.h>
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#include <stdlib.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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const size_t SHA256_OUTPUT_LENGTH = 32;
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/** Computes SHA-256 of the input. The output buffer must be a least 32
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* bytes long. */
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void _olm_crypto_sha256(
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uint8_t const * input, size_t input_length,
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uint8_t * output
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);
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/** HMAC: Keyed-Hashing for Message Authentication
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* http://tools.ietf.org/html/rfc2104
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* Computes HMAC-SHA-256 of the input for the key. The output buffer must
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* be at least 32 bytes long. */
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void _olm_crypto_hmac_sha256(
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uint8_t const * key, size_t key_length,
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uint8_t const * input, size_t input_length,
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uint8_t * output
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);
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/** HMAC-based Key Derivation Function (HKDF)
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* https://tools.ietf.org/html/rfc5869
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* Derives key material from the input bytes. */
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void _olm_crypto_hkdf_sha256(
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uint8_t const * input, size_t input_length,
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uint8_t const * info, size_t info_length,
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uint8_t const * salt, size_t salt_length,
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uint8_t * output, size_t output_length
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);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* OLM_CRYPTO_H_ */
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