/**
 * \file des.h
 */
#ifndef XYSSL_DES_H
#define XYSSL_DES_H

#define DES_ENCRYPT     1
#define DES_DECRYPT     0

/**
 * \brief          DES context structure
 */
typedef struct
{
    int mode;                   /*!<  encrypt/decrypt   */
    unsigned long sk[32];       /*!<  DES subkeys       */
}
des_context;

/**
 * \brief          Triple-DES context structure
 */
typedef struct
{
    int mode;                   /*!<  encrypt/decrypt   */
    unsigned long sk[96];       /*!<  3DES subkeys      */
}
des3_context;

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief          DES key schedule (56-bit, encryption)
 *
 * \param ctx      DES context to be initialized
 * \param key      8-byte secret key
 */
void des_setkey_enc( des_context *ctx, unsigned char key[8] );

/**
 * \brief          DES key schedule (56-bit, decryption)
 *
 * \param ctx      DES context to be initialized
 * \param key      8-byte secret key
 */
void des_setkey_dec( des_context *ctx, unsigned char key[8] );

/**
 * \brief          Triple-DES key schedule (112-bit, encryption)
 *
 * \param ctx      3DES context to be initialized
 * \param key      16-byte secret key
 */
void des3_set2key_enc( des3_context *ctx, unsigned char key[16] );

/**
 * \brief          Triple-DES key schedule (112-bit, decryption)
 *
 * \param ctx      3DES context to be initialized
 * \param key      16-byte secret key
 */
void des3_set2key_dec( des3_context *ctx, unsigned char key[16] );

/**
 * \brief          Triple-DES key schedule (168-bit, encryption)
 *
 * \param ctx      3DES context to be initialized
 * \param key      24-byte secret key
 */
void des3_set3key_enc( des3_context *ctx, unsigned char key[24] );

/**
 * \brief          Triple-DES key schedule (168-bit, decryption)
 *
 * \param ctx      3DES context to be initialized
 * \param key      24-byte secret key
 */
void des3_set3key_dec( des3_context *ctx, unsigned char key[24] );

/**
 * \brief          DES-ECB block encryption/decryption
 *
 * \param ctx      DES context
 * \param input    64-bit input block
 * \param output   64-bit output block
 */
void des_crypt_ecb( des_context *ctx,
                    unsigned char input[8],
                    unsigned char output[8] );

/**
 * \brief          DES-CBC buffer encryption/decryption
 *
 * \param ctx      DES context
 * \param mode     DES_ENCRYPT or DES_DECRYPT
 * \param length   length of the input data
 * \param iv       initialization vector (updated after use)
 * \param input    buffer holding the input data
 * \param output   buffer holding the output data
 */
void des_crypt_cbc( des_context *ctx,
                    int mode,
                    int length,
                    unsigned char iv[8],
                    unsigned char *input,
                    unsigned char *output );

/**
 * \brief          3DES-ECB block encryption/decryption
 *
 * \param ctx      3DES context
 * \param input    64-bit input block
 * \param output   64-bit output block
 */
void des3_crypt_ecb( des3_context *ctx,
                     unsigned char input[8],
                     unsigned char output[8] );

/**
 * \brief          3DES-CBC buffer encryption/decryption
 *
 * \param ctx      3DES context
 * \param mode     DES_ENCRYPT or DES_DECRYPT
 * \param length   length of the input data
 * \param iv       initialization vector (updated after use)
 * \param input    buffer holding the input data
 * \param output   buffer holding the output data
 */
void des3_crypt_cbc( des3_context *ctx,
                     int mode,
                     int length,
                     unsigned char iv[8],
                     unsigned char *input,
                     unsigned char *output );

/*
 * \brief          Checkup routine
 *
 * \return         0 if successful, or 1 if the test failed
 */
int des_self_test( int verbose );

#ifdef __cplusplus
}
#endif

#endif /* des.h */