/************************************************************************/
/*  Copyright (C), 2016-2020, [IT], 保留所有权利;
/*  模 块 名：;
/*  描    述：;
/*
/*  版    本：[V];	
/*  作    者：[Home];
/*  日    期：[6/5/2016];
/*
/*
/*  注    意：;
/*
/*  修改记录：[IT];
/*  修改日期：;
/*  修改版本：;
/*  修改内容：;
/************************************************************************/

#ifndef POLARSSL_DES_H
#define POLARSSL_DES_H

#define DES_ENCRYPT     1
#define DES_DECRYPT     0
#define DES_KEY_SIZE    8

#define POLARSSL_ERR_DES_INVALID_INPUT_LENGTH               -0x0C00

// DES结构体;
typedef struct
{
	unsigned long sk[32];       // DES 子密钥(由用户输入的密钥生成);
}
des_context;

// 3层DES结构体;
typedef struct
{
	unsigned long sk[96];       // DES 子密钥(由用户输入的密钥生成);
}
des3_context;

// 设置密钥校验位为偶校验;
void des_key_set_parity( unsigned char key[8] );
// 判断密钥校验位是否为偶校验;
int des_key_check_key_parity( const unsigned char key[8] );
// 判断密钥是否为弱密钥;
int des_key_check_weak( const unsigned char key[8] );

// 返回加密时填充后的明文长度;
unsigned __int64 des_enc_len(const unsigned __int64& nlen);
// 返回解密后,去除填充的长度;
unsigned __int64 des_dec_len(const unsigned char* input, unsigned __int64 nlen);

// 设置DES加密密钥;
void des_setkey_enc( IN des_context *ctx, IN const unsigned char key[8] );
// 设置DES解密密钥;
void des_setkey_dec( IN des_context *ctx, IN const unsigned char key[8] );

// 设置2层DES加密密钥;
void des3_set2key_enc( IN des3_context *ctx, IN const unsigned char key[16] );
// 设置2层DES解密密钥;
void des3_set2key_dec( IN des3_context *ctx, IN const unsigned char key[16] );

// 设置3层DES加密密钥;
void des3_set3key_enc( IN des3_context *ctx, IN const unsigned char key[24] );
// 设置3层DES解密密钥;
void des3_set3key_dec( IN des3_context *ctx, IN const unsigned char key[24] );

// DES-ECB模式加解密;
int des_crypt_ecb( IN des_context *ctx, IN const unsigned char input[8], IN unsigned char output[8] );
// DES-CBC模式加解密;
int des_crypt_cbc( IN des_context *ctx, IN int mode, IN int length, IN unsigned char iv[8], IN const unsigned char *input, IN unsigned char *output );
// 3层DES-ECB模式加解密;
int des3_crypt_ecb( IN des3_context *ctx, IN const unsigned char input[8], IN unsigned char output[8] );
// 3层DES-CBC模式加解密;
int des3_crypt_cbc( IN des3_context *ctx, IN int mode, IN int length, IN unsigned char iv[8], IN const unsigned char *input, IN unsigned char *output );

// 测试例子;
int des_self_test( int verbose );


#endif // POLARSSL_DES_H