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/**
******************************************************************************
* @file aes_ccm.h
* @author MCD Application Team
* @brief AES in CCM (Counter with CBC-MAC) Mode
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2015 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under Image license SLA0044,
* 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/SLA0044
*
******************************************************************************
*/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __CRL_AES_CCM_H__
#define __CRL_AES_CCM_H__
#ifdef __cplusplus
extern "C"
{
#endif
/** @ingroup AESCCM
* @{
*/
/* Exported types ------------------------------------------------------------*/
/** Structure used only for AES-GCM. Used to store the expanded key and, eventually,
* precomputed tables, according the the defined value of CRL_GFMUL in config.h */
typedef struct
{
/** Unique ID of this AES-GCM Context. \b Not \b used in current implementation. */
uint32_t mContextId;
/** 32 bit mFlags, used to perform keyschedule */
SKflags_et mFlags;
/** Pointer to original Key buffer */
const uint8_t *pmKey;
/** Pointer to original Nonce buffer */
const uint8_t *pmNonce;
/** Size of the Nonce in bytes. This must be set by the caller prior to calling Init.
Possible values are {7,8,9,10,11,12,13} */
int32_t mNonceSize;
/** This is the current IV value for encryption.*/
uint32_t amIvCTR[4];
/** This is the current IV value for authentication.*/
uint32_t amIvCBC[4];
/** AES Key length in bytes. This must be set by the caller prior to calling Init */
int32_t mKeySize;
/** Pointer to Authentication TAG. This value must be set in decryption, and this TAG will be verified */
const uint8_t *pmTag;
/** Size of the Tag to return. This must be set by the caller prior to calling Init.
Possible values are values are {4,6,8,10,12,14,16} */
int32_t mTagSize;
/** Size of the associated data to be processed yet. This must be set by the caller prior to calling Init.*/
int32_t mAssDataSize;
/** Size of the payload data to be processed yet size. This must be set by the caller prior to calling Init. */
int32_t mPayloadSize;
/** AES Expanded key. For internal use. */
uint32_t amExpKey[CRL_AES_MAX_EXPKEY_SIZE];
/** Temp Buffer */
uint32_t amTmpBuf[CRL_AES_BLOCK/sizeof(uint32_t)];
/** Number of bytes actually in use */
int32_t mTmpBufUse;
}
AESCCMctx_stt;
/* Exported functions --------------------------------------------------------*/
/* load the key and ivec, eventually performs key schedule, etc. */
int32_t AES_CCM_Encrypt_Init (AESCCMctx_stt *P_pAESCCMctx, \
const uint8_t *P_pKey, \
const uint8_t *P_pNonce);
/* Header Processing Function */
int32_t AES_CCM_Header_Append (AESCCMctx_stt *P_pAESCCMctx, \
const uint8_t *P_pInputBuffer, \
int32_t P_inputSize);
/* launch crypto operation , can be called several times */
int32_t AES_CCM_Encrypt_Append (AESCCMctx_stt *P_pAESCCMctx, \
const uint8_t *P_pInputBuffer, \
int32_t P_inputSize, \
uint8_t *P_pOutputBuffer, \
int32_t *P_pOutputSize);
/* Possible final output */
int32_t AES_CCM_Encrypt_Finish (AESCCMctx_stt *P_pAESCCMctx, \
uint8_t *P_pOutputBuffer, \
int32_t *P_pOutputSize);
/* load the key and ivec, eventually performs key schedule, etc. */
int32_t AES_CCM_Decrypt_Init (AESCCMctx_stt *P_pAESCCMctx, \
const uint8_t *P_pKey, \
const uint8_t *P_pNonce);
/* launch crypto operation , can be called several times */
int32_t AES_CCM_Decrypt_Append (AESCCMctx_stt *P_pAESCCMctx, \
const uint8_t *P_pInputBuffer, \
int32_t P_inputSize, \
uint8_t *P_pOutputBuffer, \
int32_t *P_pOutputSize);
/* Possible final output */
int32_t AES_CCM_Decrypt_Finish (AESCCMctx_stt *P_pAESCCMctx, \
uint8_t *P_pOutputBuffer, \
int32_t *P_pOutputSize);
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /* __CRL_AES_CCM_H__ */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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