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/**
******************************************************************************
* @file chacha20-poly1305.h
* @author MCD Application Team
* @version V3.0.0
* @date 05-June-2015
* @brief Container for chacha20-poly1305 functionalities
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT 2015 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Image SW License Agreement V2, (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.st.com/software_license_agreement_liberty_v2
*
* 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.
*
******************************************************************************
*/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __CHACHA20_POLY1305_H__
#define __CHACHA20_POLY1305_H__
#ifdef __cplusplus
extern "C"
{
#endif
/** @addtogroup CHACHA20POLY1305
* @{
*/
/* Includes ------------------------------------------------------------------*/
#include <stdint.h>
/* Exported types ------------------------------------------------------------*/
/**
* @brief Structure for ChaCha20-Poly1305 context
*/
typedef struct
{
uint32_t mContextId; /*!< Unique ID of this context. \b Not \b used in current implementation. */
SKflags_et mFlags; /*!< 32 bit mFlags, used to perform keyschedule and future use */
const uint8_t *pmKey; /*!< Pointer to original 32 bytes Key buffer */
const uint8_t *pmNonce; /*!< Pointer to original 12 bytes Nonce buffer */
const uint8_t *pmTag; /*!< Pointer to Authentication TAG. This value must be set in decryption, and this TAG will be verified */
uint32_t mAadSize; /*!< Size of the processed AAD */
uint32_t mCipherSize; /*!< Size of the processed CipherText */
uint32_t r[5]; /*!< Internal: value of r */
uint32_t h[5]; /*!< Internal: value of h */
uint32_t pad[4]; /*!< Internal: value of Poly nonce */
uint32_t amState[16]; /*!< Internal: ChaCha Internal State */
}
ChaCha20Poly1305ctx_stt;
/* Exported constants --------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */
int32_t ChaCha20Poly1305_Encrypt_Init(ChaCha20Poly1305ctx_stt *P_pChaCha20Poly1305ctx, const uint8_t *P_pKey, const uint8_t *P_pNonce);
int32_t ChaCha20Poly1305_Encrypt_Append(ChaCha20Poly1305ctx_stt *P_pChaCha20Poly1305ctx,
const uint8_t *P_pInputBuffer,
int32_t P_inputSize,
uint8_t *P_pOutputBuffer,
int32_t *P_pOutputSize);
int32_t ChaCha20Poly1305_Header_Append(ChaCha20Poly1305ctx_stt *P_pChaCha20Poly1305ctx, const uint8_t *P_pInputBuffer, int32_t P_inputSize);
int32_t ChaCha20Poly1305_Encrypt_Finish(ChaCha20Poly1305ctx_stt *P_pChaCha20Poly1305ctx, uint8_t *P_pOutputBuffer, int32_t *P_pOutputSize);
int32_t ChaCha20Poly1305_Decrypt_Init(ChaCha20Poly1305ctx_stt *P_pChaCha20Poly1305ctx, const uint8_t *P_pKey, const uint8_t *P_pNonce);
int32_t ChaCha20Poly1305_Decrypt_Append(ChaCha20Poly1305ctx_stt *P_pChaCha20Poly1305ctx,
const uint8_t *P_pInputBuffer,
int32_t P_inputSize,
uint8_t *P_pOutputBuffer,
int32_t *P_pOutputSize);
int32_t ChaCha20Poly1305_Decrypt_Finish(ChaCha20Poly1305ctx_stt *P_pChaCha20Poly1305ctx, uint8_t *P_pOutputBuffer, int32_t *P_pOutputSize);
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /* __CHACHA20_POLY1305_H__ */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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