lcx_chacha.h

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/*******************************************************************************
 *   Ledger Nano S - Secure firmware
 *   (c) 2022 Ledger
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 ********************************************************************************/
 
#ifndef LCX_CHACHA_H
#define LCX_CHACHA_H
 
#if defined(HAVE_CHACHA)
 
#include "ox.h"
#include <stddef.h>
 
typedef struct {
    uint32_t nrounds;    
    uint32_t state[16];  
    uint32_t block[16];  
    uint32_t pos;        
} cx_chacha_context_t;
 
void cx_chacha_init(cx_chacha_context_t *ctx, uint32_t nrounds);
 
WARN_UNUSED_RESULT cx_err_t cx_chacha_set_key(cx_chacha_context_t *ctx,
                                              const uint8_t       *key,
                                              size_t               key_len);
 
WARN_UNUSED_RESULT cx_err_t cx_chacha_start(cx_chacha_context_t *ctx,
                                            const uint8_t       *iv,
                                            size_t               iv_len);
 
WARN_UNUSED_RESULT cx_err_t cx_chacha_update(cx_chacha_context_t *ctx,
                                             const uint8_t       *input,
                                             uint8_t             *output,
                                             size_t               len);
 
WARN_UNUSED_RESULT cx_err_t cx_chacha_cipher(uint32_t       nrounds,
                                             const uint8_t *key,
                                             size_t         key_len,
                                             const uint8_t *iv,
                                             size_t         iv_len,
                                             const uint8_t *input,
                                             uint8_t       *output,
                                             size_t         len);
 
#endif  // HAVE_CHACHA
 
#endif  // LCX_CHACHA_H