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https://github.com/trezor/trezor-firmware.git
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44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
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/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __CHACHA_DRBG__
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#define __CHACHA_DRBG__
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#include "chacha20poly1305/chacha20poly1305.h"
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// Very fast deterministic random bit generator inspired by CTR_DRBG in NIST SP
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// 800-90A
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#define CHACHA_DRBG_KEY_LENGTH 16
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#define CHACHA_DRBG_IV_LENGTH 8
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#define CHACHA_DRBG_SEED_LENGTH (CHACHA_DRBG_KEY_LENGTH + CHACHA_DRBG_IV_LENGTH)
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typedef struct _CHACHA_DRBG_CTX {
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ECRYPT_ctx chacha_ctx;
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uint32_t reseed_counter;
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} CHACHA_DRBG_CTX;
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void chacha_drbg_init(CHACHA_DRBG_CTX *ctx,
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const uint8_t entropy[CHACHA_DRBG_SEED_LENGTH]);
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void chacha_drbg_reseed(CHACHA_DRBG_CTX *ctx,
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const uint8_t entropy[CHACHA_DRBG_SEED_LENGTH]);
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void chacha_drbg_generate(CHACHA_DRBG_CTX *ctx, uint8_t *output,
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uint8_t output_length);
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#endif // __CHACHA_DRBG__
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