crypt_chacha20.h

/*
 * This file is part of the openHiTLS project.
 *
 * openHiTLS is licensed under the Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *
 *     http://license.coscl.org.cn/MulanPSL2
 *
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */
 
#ifndef CRYPT_CHACHA20_H
#define CRYPT_CHACHA20_H
 
#include "hitls_build.h"
#ifdef HITLS_CRYPTO_CHACHA20
 
#include <stdint.h>
#include "crypt_types.h"
 
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
 
#define CHACHA20_STATESIZE 16
#define CHACHA20_STATEBYTES (CHACHA20_STATESIZE * sizeof(uint32_t))
#define CHACHA20_KEYLEN 32
#define CHACHA20_NONCELEN 12
 
typedef struct {
    uint32_t state[CHACHA20_STATESIZE]; // state RFC 7539
    union {
        uint32_t c[CHACHA20_STATESIZE];
        uint8_t u[CHACHA20_STATEBYTES];
    } last; // save the last data
    uint32_t lastLen; // remaining length of the last data in bytes
    uint8_t set; // indicates whether the key and nonce are set
} CRYPT_CHACHA20_Ctx;
 
int32_t CRYPT_CHACHA20_SetKey(CRYPT_CHACHA20_Ctx *ctx, const uint8_t *key, uint32_t keyLen);
 
int32_t CRYPT_CHACHA20_Update(CRYPT_CHACHA20_Ctx *ctx, const uint8_t *in, uint8_t *out, uint32_t len);
 
int32_t CRYPT_CHACHA20_Ctrl(CRYPT_CHACHA20_Ctx *ctx, int32_t opt, void *val, uint32_t len);
 
void CRYPT_CHACHA20_Clean(CRYPT_CHACHA20_Ctx *ctx);
 
#ifdef __cplusplus
}
#endif // __cplusplus
 
#endif // HITLS_CRYPTO_CHACHA20
 
#endif // CRYPT_CHACHA20_H