/******************************************************************************
 * @file     aes.c
 * @brief    AES firmware functions.
 * @version  V4.0.1
 * @date     30-July-2026
 *
 * @note
 * Copyright (C) 2022 Spintrol Electronic Technology (Shanghai) Co., Ltd.. All rights reserved.
 *
 * @attention
 * THIS SOFTWARE JUST PROVIDES CUSTOMERS WITH CODING INFORMATION REGARDING
 * THEIR PRODUCTS, WHICH AIMS AT SAVING TIME FOR THEM. SPINTROL SHALL NOT BE
 * LIABLE FOR THE USE OF THE SOFTWARE. SPINTROL DOES NOT GUARANTEE THE
 * CORRECTNESS OF THIS SOFTWARE AND RESERVES THE RIGHT TO MODIFY THE SOFTWARE
 * WITHOUT NOTIFICATION.
 *
 ******************************************************************************/

#include "aes.h"


#if defined(__CC_ARM)
    #pragma push
    #pragma O1
#endif




/******************************************************************************
 * @brief      AES CBC mode initialize with some predefined configurations
 *
 * @param[in]  AESx      :  Select the AES module
 * @param[in]  au32IV    :  Array stores AES initial vectors
 * @param[in]  au32Key   :  Array stores AES Keys
 * @param[in]  eKeySize  :  Key size
 * @param[in]  u32MstrLen:  M-String length (in bytes)
 *
 * @return     none
 *
 ******************************************************************************/
#if defined(__ICCARM__)
#pragma optimize=low
#endif
void AES_CBCModeInit(AES_REGS *AESx, uint32_t au32IV[], uint32_t au32Key[], AES_KeySizeEnum eKeySize, uint32_t u32MstrLen)
{
    uint32_t i, j;

    /* Clear Interrupt Flags and Raw Flags */
    AESx->AESIC.all =  AESIC_ALL_DONE_CLEAR
                       | AESIC_ALL_IFIFOFULL_CLEAR
                       | AESIC_ALL_OFIFOEMPTY_CLEAR;

    /* CBC Mode */
    AESx->AESCTL0.bit.MODE = AESCTL0_BIT_MODE_CBC;

    /* Encryption */
    AESx->AESCTL0.bit.DECRYPTEN = AESCTL0_BIT_DECRYPTEN_ENCRYPT;

    /* Key Size */
    AESx->AESCTL0.bit.KEYSIZE = eKeySize;

    /* Set Init Vector */
    for (i = 0; i < 4; i++)
    {
        AESx->AESIV[3 - i].all = au32IV[i];
    }

    j = (eKeySize < 2) ? (4 << eKeySize) : 6;
    /* Set AES Key */
    for (i = 0; i < j; i++)
    {
        AESx->AESKEY[7 - i].all = au32Key[i];
    }

    /* Set A-String Length */
    AESx->AESASTRLEN.all = 0;

    /* Set M-String Length */
    AESx->AESMSTRLEN.all = u32MstrLen;
}




/******************************************************************************
 * @brief      AES CCM mode initialize with some predefined configurations
 *
 * @param[in]  AESx      :  Select the AES module
 * @param[in]  au32IV    :  Array stores AES initial vectors
 * @param[in]  au32Key   :  Array stores AES Keys
 * @param[in]  eKeySize  :  Key size
 * @param[in]  u32MstrLen:  M-String length (in bytes)
 * @param[in]  u32MstrLen:  A-String length (in bytes)
 *
 * @return     none
 *
 ******************************************************************************/
#if defined(__ICCARM__)
#pragma optimize=low
#endif
void AES_CCMModeInit(AES_REGS *AESx, uint32_t au32IV[], uint32_t au32Key[], AES_KeySizeEnum eKeySize, uint32_t u32MstrLen, uint32_t u32AstrLen)
{
    uint32_t i, j;

    /* Clear Interrupt Flags and Raw Flags */
    AESx->AESIC.all =  AESIC_ALL_DONE_CLEAR
                       | AESIC_ALL_IFIFOFULL_CLEAR
                       | AESIC_ALL_OFIFOEMPTY_CLEAR;

    /* CCM Mode */
    AESx->AESCTL0.bit.MODE = AESCTL0_BIT_MODE_CCM;

    /* Encryption */
    AESx->AESCTL0.bit.DECRYPTEN = AESCTL0_BIT_DECRYPTEN_ENCRYPT;

    /* Key Size */
    AESx->AESCTL0.bit.KEYSIZE = eKeySize;

    /* MIC Length = 16 Bytes  */
    AESx->AESCTL0.bit.MICLEN = AESCTL0_BIT_MICLEN_16BYTE;

    /* Set Init Vector */
    for (i = 0; i < 4; i++)
    {
        AESx->AESIV[3 - i].all = au32IV[i];
    }

    j = (eKeySize < 2) ? (4 << eKeySize) : 6;
    /* Set AES Key */
    for (i = 0; i < j; i++)
    {
        AESx->AESKEY[7 - i].all = au32Key[i];
    }

    /* Set A-String Length */
    AESx->AESASTRLEN.all = u32AstrLen;

    /* Set M-String Length */
    AESx->AESMSTRLEN.all = u32MstrLen;

    /* Enable MIC output */
    AESx->AESCTL0.bit.OUTMIC = AESCTL0_BIT_OUTMIC_ENABLE;
}




/******************************************************************************
 * @brief      Encrypt data
 *
 * @param[in]  AESx      :  Select the AES module
 * @param[in]  u32DataIn :  Array stores raw data
 * @param[in]  u32DataOut:  Array stores encrypted data
 * @param[in]  u32InLen  :  Raw data length (in words)
 * @param[in]  u32OutLen :  Encrypted data length (in words)
 *
 * @return     SUCCESS or ERROR
 *
 ******************************************************************************/
#if defined(__ICCARM__)
#pragma optimize=low
#endif
ErrorStatus AES_EncryptData(AES_REGS *AESx, uint32_t u32DataIn[], uint32_t u32DataOut[], uint32_t u32InLen, uint32_t u32OutLen)
{
    uint32_t i = 0, j = 0;
    uint32_t u32OutTimeOut = 100000UL;
    uint32_t u32InTimeOut = 100000UL;

    /* Set AES operate mode */
    AES_EncryptMode(AESx);

    /* Clear Input FIFO */
    AES_ClearInputFIFO(AESx);

    /* Clear Output FIFO */
    AES_ClearOutputFIFO(AESx);

    /* Start AES operation */
    AES_Start(AESx);

    /* Check AES operation error */
    if (AES_IsOperateError(AESx))
    {
        return ERROR;
    }

    /* Write and Read */
    while ((i < u32InLen) || (j < u32OutLen))
    {
        /* Write raw data to input fifo */
        if ((--u32InTimeOut > 0) && ((i < u32InLen) && (AES_IsInputFull(AESx) != 1)))
        {
            AES_FeedData(AESx, u32DataIn[i++]);
            u32InTimeOut = 100000UL;
        }
        if (u32InTimeOut == 0)
        {
            return ERROR;
        }

        /* Read encrypted data from output fifo */
        if ((--u32OutTimeOut > 0) && ((j < u32OutLen) && (AES_IsOutputEmpty(AESx) != 1)))
        {
            u32DataOut[j++] = AES_ReadData(AESx);
            u32OutTimeOut = 100000UL;
        }

        if (u32OutTimeOut == 0)
        {
            u32DataOut[j++] = AES_ReadData(AESx);
            return ERROR;
        }
    }

    /* Wait until AES operation done */
    for (u32InTimeOut = 100000UL; u32InTimeOut > 0U; u32InTimeOut--)
    {
        if (AES_IsOperateDone(AESx))
        {
            break;
        }
    }

    if (u32InTimeOut == 0)
    {
        return ERROR;
    }

    /* Check AES operation error */
    if (AES_IsOperateError(AESx))
    {
        return ERROR;
    }

    return SUCCESS;
}




/******************************************************************************
 * @brief      Decrypt data
 *
 * @param[in]  AESx      :  Select the AES module
 * @param[in]  u32DataIn :  Array stores encrypted data
 * @param[in]  u32DataOut:  Array stores decrypted data
 * @param[in]  u32InLen  :  Encrypted data length (in words)
 * @param[in]  u32OutLen :  Decrypted data length (in words)
 *
 * @return     SUCCESS or ERROR
 *
 ******************************************************************************/
#if defined(__ICCARM__)
#pragma optimize=low
#endif
ErrorStatus AES_DecryptData(AES_REGS *AESx, uint32_t u32DataIn[], uint32_t u32DataOut[], uint32_t u32InLen, uint32_t u32OutLen)
{
    uint32_t i = 0, j = 0;
    uint32_t u32OutTimeOut = 100000UL;
    uint32_t u32InTimeOut = 100000UL;

    /* Set AES operate mode */
    AES_DecryptMode(AESx);

    /* Clear Input FIFO */
    AES_ClearInputFIFO(AESx);

    /* Clear Output FIFO */
    AES_ClearOutputFIFO(AESx);

    /* Start AES operation */
    AES_Start(AESx);

    /* Check AES operation error */
    if (AES_IsOperateError(AESx))
    {
        return ERROR;
    }

    /* Write and Read */
    while ((i < u32InLen) || (j < u32OutLen))
    {
        /* Write encrypted data to input fifo */
        if ((--u32InTimeOut > 0) && ((i < u32InLen) && (AES_IsInputFull(AESx) != 1)))
        {
            AES_FeedData(AESx, u32DataIn[i++]);
            u32InTimeOut = 100000UL;
        }
        if (u32InTimeOut == 0)
        {
            return ERROR;
        }

        /* Read decrypted data from output fifo */
        if ((--u32OutTimeOut > 0) && ((j < u32OutLen) && (AES_IsOutputEmpty(AESx) != 1)))
        {
            u32DataOut[j++] = AES_ReadData(AESx);
            u32OutTimeOut = 100000UL;
        }
        if (u32OutTimeOut == 0)
        {
            u32DataOut[j++] = AES_ReadData(AESx);
            return ERROR;
        }
    }

    /* Wait until AES operation done */
    for (u32OutTimeOut = 100000UL; u32OutTimeOut > 0U; u32OutTimeOut--)
    {
        if (AES_IsOperateDone(AESx))
        {
            break;
        }
    }

    if (u32OutTimeOut == 0)
    {
        return ERROR;
    }

    /* Check AES operation error */
    if (AES_IsOperateError(AESx))
    {
        return ERROR;
    }

    return SUCCESS;
}




/******************************************************************************
 * @brief      Read AES MIC result
 *
 * @param[in]  AESx        :  Select the AES module
 * @param[in]  eMicLen     :  Expected MIC data length
 *                            Please see AES_MicLenEnum for detail
 *
 * @param[out]  pu32MicData:  Pointer to the array that stored MIC result
 *
 * @return     none
 *
 ******************************************************************************/
#if defined(__ICCARM__)
#pragma optimize=low
#endif
void AES_ReadMIC(AES_REGS *AESx, uint32_t *pu32MicData, AES_MicLenEnum eMicLen)
{
    /* Captured the mic data */
    switch (eMicLen)
    {
        case 0:
            pu32MicData[0] = AESx->AESOV[3].all;
            break;

        case 1:
            pu32MicData[0] = AESx->AESOV[2].all;
            pu32MicData[1] = AESx->AESOV[3].all;
            break;

        case 2:
            pu32MicData[0] = AESx->AESOV[1].all;
            pu32MicData[1] = AESx->AESOV[2].all;
            pu32MicData[2] = AESx->AESOV[3].all;
            break;

        case 3:
            pu32MicData[0] = AESx->AESOV[0].all;
            pu32MicData[1] = AESx->AESOV[1].all;
            pu32MicData[2] = AESx->AESOV[2].all;
            pu32MicData[3] = AESx->AESOV[3].all;
            break;

        default:
            break;
    }
}


#if defined(__CC_ARM)
    #pragma pop
#endif


/******************* Copyright (C) 2022 Spintrol Electronic Technology (Shanghai) Co., Ltd. ***** END OF FILE ****/
