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/**
 * @file n32g45x_des.h
 * @author Nations
 * @version v1.0.0
 *
 * @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved.
 */
#ifndef __N32G45X_DES_H__
#define __N32G45X_DES_H__

#include <stdint.h>

/** @addtogroup N32G45X_Algorithm_Library
 * @{
 */

/** @addtogroup DES
 * @brief DES symmetrical cipher algorithm
 * @{
 */
#define DES_ECB (0x11111111)
#define DES_CBC (0x22222222)


#define DES_ENC  (0x33333333)
#define DES_DEC  (0x44444444)

#define DES_KEY  (0x55555555)
#define TDES_2KEY  (0x66666666)
#define TDES_3KEY  (0x77777777)

enum DES
{
    DES_Crypto_OK        = 0x0,        // DES/TDES opreation success
    DES_Init_OK          = 0x0,        // DES/TDES Init opreation success
    DES_Crypto_ModeError = 0x5a5a5a5a, // Working mode error(Neither ECB nor CBC)
    DES_Crypto_EnOrDeError,            // En&De error(Neither encryption nor decryption)
    DES_Crypto_ParaNull,               // the part of input(output/iv) Null
    DES_Crypto_LengthError,            // the length of input message must be 2 times and cannot be zero
    DES_Crypto_KeyError,               // keyMode error(Neither DES_KEY nor TDES_2KEY nor TDES_3KEY)
    DES_Crypto_UnInitError,            // DES/TDES uninitialized
};

typedef struct
{
    uint32_t* in;        // the  part of input to be encrypted or decrypted
    uint32_t* iv;        // the  part of initial vector
    uint32_t* out;       // the  part of out
    uint32_t* key;       // the  part of key
    uint32_t inWordLen;  // the length(by word) of plaintext or cipher
    uint32_t En_De;      // 0x33333333- encrypt, 0x44444444 - decrypt
    uint32_t Mode;       // 0x11111111 - ECB, 0x22222222 - CBC
    uint32_t keyMode;    // TDES key mode: 0x55555555-key,0x66666666-2key, 0x77777777-3key
} DES_PARM;

 /**
 * @brief DES_Init
 * @return DES_Init_OK, DES/TDES Init success; othets: DES/TDES Init fail
 * @note    
 */
uint32_t DES_Init(DES_PARM* parm);

/**
 * @brief DES crypto
 * @param[in] parm pointer to DES/TDES context and the detail please refer to struct DES_PARM in DES.h
 * @return DES_Crypto_OK, DES/TDES crypto success; othets: DES/TDES crypto fail(reference to the definition by enum variation) 
 * @note  1.Please refer to the demo in user guidance before using this function  
 *        2.Input and output can be the same buffer
 *        3. IV can be NULL when ECB mode
 *        4. The word lengrh of message must be as times as 2.
 *        5. If the input is in byte, make sure align by word.
 */
uint32_t DES_Crypto(DES_PARM* parm);

/**
 * @brief DES close
 * @return none
 * @note  if you want to close DES algorithm, this function can be recalled.
 */
void DES_Close(void);

/**
 * @brief Get DES/TDES lib version
 * @param[out] type pointer one byte type information represents the type of the lib, like Commercial version.\
 * @Bits 0~4 stands for Commercial (C), Security (S), Normal (N), Evaluation (E), Test (T), Bits 5~7 are reserved. e.g. 0x09 stands for CE version.
 * @param[out] customer pointer one byte customer information represents customer ID. for example, 0x00 stands for standard version, 0x01 is for Tianyu customized version...
 * @param[out] date pointer array which include three bytes date information. If the returned bytes are 18,9,13,this denotes September 13,2018 
 * @param[out] version pointer one byte version information represents develop version of the lib. e.g. 0x12 denotes version 1.2.
 * @return none
 * @1.You can recall this function to get DES/TDES lib information
 */
void DES_Version(uint8_t* type, uint8_t* customer, uint8_t date[3], uint8_t* version);

#endif
