58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/*
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* Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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/* RFC 8439 "ChaCha20 and Poly1305 for IETF Protocols" */
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#ifndef GMSSL_CHACHA20_H
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#define GMSSL_CHACHA20_H
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#define CHACHA20_IS_BIG_ENDIAN 0
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#define CHACHA20_KEY_BITS 256
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#define CHACHA20_NONCE_BITS 96
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#define CHACHA20_COUNTER_BITS 32
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#define CHACHA20_KEY_SIZE (CHACHA20_KEY_BITS/8)
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#define CHACHA20_NONCE_SIZE (CHACHA20_NONCE_BITS/8)
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#define CHACHA20_COUNTER_SIZE (CHACHA20_COUNTER_BITS/8)
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#define CHACHA20_KEY_WORDS (CHACHA20_KEY_SIZE/sizeof(uint32_t))
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#define CHACHA20_NONCE_WORDS (CHACHA20_NONCE_SIZE/sizeof(uint32_t))
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#define CHACHA20_COUNTER_WORDS (CHACHA20_COUNTER_SIZE/sizeof(uint32_t))
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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uint32_t d[16];
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} CHACHA20_STATE;
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void chacha20_init(CHACHA20_STATE *state,
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const uint8_t key[CHACHA20_KEY_SIZE],
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const uint8_t nonce[CHACHA20_NONCE_SIZE], uint32_t counter);
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void chacha20_generate_keystream(CHACHA20_STATE *state,
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size_t counts, uint8_t *out);
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#ifdef __cplusplus
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}
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#endif
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#endif
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