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Diffstat (limited to 'include/libecc/hash/shake.h')
| -rw-r--r-- | include/libecc/hash/shake.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/include/libecc/hash/shake.h b/include/libecc/hash/shake.h new file mode 100644 index 000000000000..aa3418529b7b --- /dev/null +++ b/include/libecc/hash/shake.h @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2021 - This file is part of libecc project + * + * Authors: + * Ryad BENADJILA <ryadbenadjila@gmail.com> + * Arnaud EBALARD <arnaud.ebalard@ssi.gouv.fr> + * + * This software is licensed under a dual BSD and GPL v2 license. + * See LICENSE file at the root folder of the project. + */ +#ifndef __SHAKE_H__ +#define __SHAKE_H__ + +#include <libecc/hash/keccak.h> + +typedef enum { + SHAKE_LITTLE = 0, + SHAKE_BIG = 1, +} shake_endianness; +/* + * Generic context for all SHAKE instances. Only difference is digest size + * value, initialized in init() call and used in finalize(). + */ +typedef struct shake_context_ { + u8 shake_digest_size; + u8 shake_block_size; + shake_endianness shake_endian; + /* Local index, useful for the absorbing phase */ + u64 shake_idx; + /* Keccak's state, viewed as a bi-dimensional array */ + u64 shake_state[KECCAK_SLICES * KECCAK_SLICES]; + /* Initialization magic value */ + word_t magic; +} shake_context; + + +ATTRIBUTE_WARN_UNUSED_RET int _shake_init(shake_context *ctx, u8 digest_size, u8 block_size); +ATTRIBUTE_WARN_UNUSED_RET int _shake_update(shake_context *ctx, const u8 *buf, u32 buflen); +ATTRIBUTE_WARN_UNUSED_RET int _shake_finalize(shake_context *ctx, u8 *output); + +#endif /* __SHAKE_H__ */ |