/** * \file des.h * * \brief DES block cipher * * Copyright (C) 2006-2010, Brainspark B.V. * * This file is part of PolarSSL (http://www.polarssl.org) * Lead Maintainer: Paul Bakker * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef POLARSSL_DES_H #define POLARSSL_DES_H #include #ifdef _MSC_VER #include typedef UINT32 uint32_t; #else #include #endif #define DES_ENCRYPT 1 #define DES_DECRYPT 0 #define POLARSSL_ERR_DES_INVALID_INPUT_LENGTH -0x0032 /**< The data input has an invalid length. */ #define DES_KEY_SIZE 8 /** * \brief DES context structure */ typedef struct { int mode; /*!< encrypt/decrypt */ uint32_t sk[32]; /*!< DES subkeys */ } des_context; /** * \brief Triple-DES context structure */ typedef struct { int mode; /*!< encrypt/decrypt */ uint32_t sk[96]; /*!< 3DES subkeys */ } des3_context; #ifdef __cplusplus extern "C" { #endif /** * \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] ); /** * \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 */ int des_crypt_cbc( des_context *ctx, int mode, size_t length, unsigned char iv[8], const 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 * * \return 0 if successful */ int des3_crypt_ecb( des3_context *ctx, const 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 * * \return 0 if successful, or POLARSSL_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 ); /* * \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 */