227 lines
6.3 KiB
C
227 lines
6.3 KiB
C
/**
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* \file des.h
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*
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* \brief DES block cipher
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*
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* Copyright (C) 2006-2010, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_DES_H
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#define POLARSSL_DES_H
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#include <string.h>
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#define DES_ENCRYPT 1
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#define DES_DECRYPT 0
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#define POLARSSL_ERR_DES_INVALID_INPUT_LENGTH -0x0032 /**< The data input has an invalid length. */
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#define DES_KEY_SIZE 8
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/**
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* \brief DES context structure
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*/
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typedef struct
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{
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int mode; /*!< encrypt/decrypt */
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unsigned long sk[32]; /*!< DES subkeys */
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}
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des_context;
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/**
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* \brief Triple-DES context structure
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*/
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typedef struct
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{
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int mode; /*!< encrypt/decrypt */
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unsigned long sk[96]; /*!< 3DES subkeys */
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}
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des3_context;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Set key parity on the given key to odd.
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*
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* DES keys are 56 bits long, but each byte is padded with
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* a parity bit to allow verification.
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*
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* \param key 8-byte secret key
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*/
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void des_key_set_parity( unsigned char key[DES_KEY_SIZE] );
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/**
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* \brief Check that key parity on the given key is odd.
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*
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* DES keys are 56 bits long, but each byte is padded with
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* a parity bit to allow verification.
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*
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* \param key 8-byte secret key
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*
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* \return 0 is parity was ok, 1 if parity was not correct.
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*/
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int des_key_check_key_parity( const unsigned char key[DES_KEY_SIZE] );
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/**
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* \brief Check that key is not a weak or semi-weak DES key
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*
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* \param key 8-byte secret key
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*
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* \resurn 0 if no weak key was found, 1 if a weak key was identified.
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*/
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int des_key_check_weak( const unsigned char key[DES_KEY_SIZE] );
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/**
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* \brief DES key schedule (56-bit, encryption)
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*
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* \param ctx DES context to be initialized
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* \param key 8-byte secret key
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*
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* \return 0
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*/
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int des_setkey_enc( des_context *ctx, const unsigned char key[DES_KEY_SIZE] );
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/**
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* \brief DES key schedule (56-bit, decryption)
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*
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* \param ctx DES context to be initialized
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* \param key 8-byte secret key
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*
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* \return 0
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*/
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int des_setkey_dec( des_context *ctx, const unsigned char key[DES_KEY_SIZE] );
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/**
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* \brief Triple-DES key schedule (112-bit, encryption)
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*
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* \param ctx 3DES context to be initialized
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* \param key 16-byte secret key
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*
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* \return 0
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*/
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int des3_set2key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
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/**
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* \brief Triple-DES key schedule (112-bit, decryption)
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*
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* \param ctx 3DES context to be initialized
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* \param key 16-byte secret key
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*
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* \return 0
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*/
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int des3_set2key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
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/**
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* \brief Triple-DES key schedule (168-bit, encryption)
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*
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* \param ctx 3DES context to be initialized
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* \param key 24-byte secret key
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*
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* \return 0
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*/
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int des3_set3key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
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/**
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* \brief Triple-DES key schedule (168-bit, decryption)
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*
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* \param ctx 3DES context to be initialized
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* \param key 24-byte secret key
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*
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* \return 0
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*/
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int des3_set3key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
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/**
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* \brief DES-ECB block encryption/decryption
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*
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* \param ctx DES context
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* \param input 64-bit input block
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* \param output 64-bit output block
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*
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* \return 0 if successful
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*/
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int des_crypt_ecb( des_context *ctx,
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const unsigned char input[8],
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unsigned char output[8] );
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/**
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* \brief DES-CBC buffer encryption/decryption
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*
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* \param ctx DES context
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* \param mode DES_ENCRYPT or DES_DECRYPT
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* \param length length of the input data
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* \param iv initialization vector (updated after use)
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* \param input buffer holding the input data
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* \param output buffer holding the output data
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*/
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int des_crypt_cbc( des_context *ctx,
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int mode,
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size_t length,
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unsigned char iv[8],
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const unsigned char *input,
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unsigned char *output );
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/**
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* \brief 3DES-ECB block encryption/decryption
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*
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* \param ctx 3DES context
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* \param input 64-bit input block
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* \param output 64-bit output block
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*
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* \return 0 if successful
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*/
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int des3_crypt_ecb( des3_context *ctx,
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const unsigned char input[8],
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unsigned char output[8] );
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/**
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* \brief 3DES-CBC buffer encryption/decryption
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*
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* \param ctx 3DES context
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* \param mode DES_ENCRYPT or DES_DECRYPT
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* \param length length of the input data
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* \param iv initialization vector (updated after use)
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* \param input buffer holding the input data
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* \param output buffer holding the output data
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*
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* \return 0 if successful, or POLARSSL_ERR_DES_INVALID_INPUT_LENGTH
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*/
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int des3_crypt_cbc( des3_context *ctx,
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int mode,
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size_t length,
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unsigned char iv[8],
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const unsigned char *input,
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unsigned char *output );
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/*
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if the test failed
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*/
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int des_self_test( int verbose );
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#ifdef __cplusplus
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}
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#endif
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#endif /* des.h */
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