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/**
* \file des.h
*/
#ifndef _DES_H
#define _DES_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief DES context structure
*/
typedef struct
{
unsigned long esk[32]; /*!< DES encryption subkeys */
unsigned long dsk[32]; /*!< DES decryption subkeys */
}
des_context;
/**
* \brief Triple-DES context structure
*/
typedef struct
{
unsigned long esk[96]; /*!< Triple-DES encryption subkeys */
unsigned long dsk[96]; /*!< Triple-DES decryption subkeys */
}
des3_context;
/**
* \brief DES key schedule (56-bit)
*
* \param ctx DES context to be initialized
* \param key 8-byte secret key
*/
void des_set_key( des_context *ctx, unsigned char key[8] );
/**
* \brief DES block encryption (ECB mode)
*
* \param ctx DES context
* \param input plaintext block
* \param output ciphertext block
*/
void des_encrypt( des_context *ctx,
unsigned char input[8],
unsigned char output[8] );
/**
* \brief DES block decryption (ECB mode)
*
* \param ctx DES context
* \param input ciphertext block
* \param output plaintext block
*/
void des_decrypt( des_context *ctx,
unsigned char input[8],
unsigned char output[8] );
/**
* \brief DES-CBC buffer encryption
*
* \param ctx DES context
* \param iv initialization vector (modified after use)
* \param input buffer holding the plaintext
* \param output buffer holding the ciphertext
* \param len length of the data to be encrypted
*/
void des_cbc_encrypt( des_context *ctx,
unsigned char iv[8],
unsigned char *input,
unsigned char *output,
int len );
/**
* \brief DES-CBC buffer decryption
*
* \param ctx DES context
* \param iv initialization vector (modified after use)
* \param input buffer holding the ciphertext
* \param output buffer holding the plaintext
* \param len length of the data to be decrypted
*/
void des_cbc_decrypt( des_context *ctx,
unsigned char iv[8],
unsigned char *input,
unsigned char *output,
int len );
/**
* \brief Triple-DES key schedule (112-bit)
*
* \param ctx 3DES context to be initialized
* \param key 16-byte secret key
*/
void des3_set_2keys( des3_context *ctx, unsigned char key[16] );
/**
* \brief Triple-DES key schedule (168-bit)
*
* \param ctx 3DES context to be initialized
* \param key 24-byte secret key
*/
void des3_set_3keys( des3_context *ctx, unsigned char key[24] );
/**
* \brief Triple-DES block encryption (ECB mode)
*
* \param ctx 3DES context
* \param input plaintext block
* \param output ciphertext block
*/
void des3_encrypt( des3_context *ctx,
unsigned char input[8],
unsigned char output[8] );
/**
* \brief Triple-DES block decryption (ECB mode)
*
* \param ctx 3DES context
* \param input ciphertext block
* \param output plaintext block
*/
void des3_decrypt( des3_context *ctx,
unsigned char input[8],
unsigned char output[8] );
/**
* \brief 3DES-CBC buffer encryption
*
* \param ctx 3DES context
* \param iv initialization vector (modified after use)
* \param input buffer holding the plaintext
* \param output buffer holding the ciphertext
* \param len length of the data to be encrypted
*/
void des3_cbc_encrypt( des3_context *ctx,
unsigned char iv[8],
unsigned char *input,
unsigned char *output,
int len );
/**
* \brief 3DES-CBC buffer decryption
*
* \param ctx 3DES context
* \param iv initialization vector (modified after use)
* \param input buffer holding the ciphertext
* \param output buffer holding the plaintext
* \param len length of the data to be decrypted
*/
void des3_cbc_decrypt( des3_context *ctx,
unsigned char iv[8],
unsigned char *input,
unsigned char *output,
int len );
/*
* \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 */
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