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