#ifndef DES_H #define DES_H #include //#include typedef unsigned int uint32_t; #define DES_ENCRYPT 1 #define DES_DECRYPT 0 #define ERR_DES_INVALID_INPUT_LENGTH -0x0032 /**< The data input has an invalid length. */ #define DES_KEY_SIZE 8 #if !defined(DES_ALT) // Regular implementation // #ifdef __cplusplus extern "C" { #endif // DES上下文结构体; typedef struct { uint32_t sk[32]; // DES subkeys; } des_context; // 3层（Triple）DES上下文结构体; typedef struct { uint32_t sk[96]; // 3DES subkeys; } des3_context; /** * \brief Initialize DES context * * \param ctx DES context to be initialized */ void des_init( des_context *ctx ); /** * \brief Clear DES context * * \param ctx DES context to be cleared */ void des_free( des_context *ctx ); /** * \brief Initialize Triple-DES context * * \param ctx DES3 context to be initialized */ void des3_init( des3_context *ctx ); /** * \brief Clear Triple-DES context * * \param ctx DES3 context to be cleared */ void des3_free( des3_context *ctx ); /** * \brief Set key parity on the given key to odd. * * DES keys are 56 bits long, but each byte is padded with * a parity bit to allow verification. * * \param key 8-byte secret key */ void des_key_set_parity( unsigned char key[DES_KEY_SIZE] ); /** * \brief Check that key parity on the given key is odd. * * DES keys are 56 bits long, but each byte is padded with * a parity bit to allow verification. * * \param key 8-byte secret key * * \return 0 is parity was ok, 1 if parity was not correct. */ int des_key_check_key_parity( const unsigned char key[DES_KEY_SIZE] ); /** * \brief Check that key is not a weak or semi-weak DES key * * \param key 8-byte secret key * * \return 0 if no weak key was found, 1 if a weak key was identified. */ int des_key_check_weak( const unsigned char key[DES_KEY_SIZE] ); /** * \brief DES key schedule (56-bit, encryption) * * \param ctx DES context to be initialized * \param key 8-byte secret key * * \return 0 */ int des_setkey_enc( des_context *ctx, const unsigned char key[DES_KEY_SIZE] ); /** * \brief DES key schedule (56-bit, decryption) * * \param ctx DES context to be initialized * \param key 8-byte secret key * * \return 0 */ int des_setkey_dec( des_context *ctx, const unsigned char key[DES_KEY_SIZE] ); /** * \brief Triple-DES key schedule (112-bit, encryption) * * \param ctx 3DES context to be initialized * \param key 16-byte secret key * * \return 0 */ int des3_set2key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] ); /** * \brief Triple-DES key schedule (112-bit, decryption) * * \param ctx 3DES context to be initialized * \param key 16-byte secret key * * \return 0 */ int des3_set2key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] ); /** * \brief Triple-DES key schedule (168-bit, encryption) * * \param ctx 3DES context to be initialized * \param key 24-byte secret key * * \return 0 */ int des3_set3key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] ); /** * \brief Triple-DES key schedule (168-bit, decryption) * * \param ctx 3DES context to be initialized * \param key 24-byte secret key * * \return 0 */ int des3_set3key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] ); /** * \brief DES-ECB block encryption/decryption * * \param ctx DES context * \param input 64-bit input block * \param output 64-bit output block * * \return 0 if successful */ int des_crypt_ecb( des_context *ctx, const unsigned char input[8], unsigned char output[8] ); #if defined(CIPHER_MODE_CBC) /** * \brief DES-CBC buffer encryption/decryption * * \note Upon exit, the content of the IV is updated so that you can * call the function same function again on the following * block(s) of data and get the same result as if it was * encrypted in one call. This allows a "streaming" usage. * If on the other hand you need to retain the contents of the * IV, you should either save it manually or use the cipher * module instead. * * \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 */ int des_crypt_cbc( des_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output ); #endif /* CIPHER_MODE_CBC */ /** * \brief 3DES-ECB block encryption/decryption * * \param ctx 3DES context * \param input 64-bit input block * \param output 64-bit output block * * \return 0 if successful */ int des3_crypt_ecb( des3_context *ctx, const unsigned char input[8], unsigned char output[8] ); #if defined(CIPHER_MODE_CBC) /** * \brief 3DES-CBC buffer encryption/decryption * * \note Upon exit, the content of the IV is updated so that you can * call the function same function again on the following * block(s) of data and get the same result as if it was * encrypted in one call. This allows a "streaming" usage. * If on the other hand you need to retain the contents of the * IV, you should either save it manually or use the cipher * module instead. * * \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 * * \return 0 if successful, or ERR_DES_INVALID_INPUT_LENGTH */ int des3_crypt_cbc( des3_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output ); #endif /* CIPHER_MODE_CBC */ /** * \brief Internal function for key expansion. * (Only exposed to allow overriding it, * see DES_SETKEY_ALT) * * \param SK Round keys * \param key Base key */ void des_setkey( uint32_t SK[32], const unsigned char key[DES_KEY_SIZE] ); #ifdef __cplusplus } #endif #else /* DES_ALT */ #include "des_alt.h" #endif /* DES_ALT */ #ifdef __cplusplus extern "C" { #endif /** * \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 */