96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/* cast5.h */
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/*
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This file is part of the ARM-Crypto-Lib.
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Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file cast5.h
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* \author Daniel Otte
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* \date 2006-07-26
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* \license GPLv3 or later
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* \brief Implementation of the CAST5 (aka CAST-128) cipher algorithm as described in RFC 2144
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*
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*/
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#ifndef CAST5_H_
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#define CAST5_H_
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#include <stdint.h>
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#ifndef BOOL
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#define BOOL
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#ifndef __BOOL
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#define __BOOL
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#ifndef __BOOL__
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#define __BOOL__
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typedef enum{false=0,true=1} bool;
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#endif
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#endif
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#endif
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/** \typedef cast5_ctx_t
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* \brief CAST-5 context
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*
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* A variable of this type may hold a keyschedule for the CAST-5 cipher.
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* This context is regulary generated by the
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* cast5_init(uint8_t* key, uint8_t keylength_b, cast5_ctx_t* s) function.
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*/
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typedef struct cast5_ctx_st{
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uint32_t mask[16];
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uint8_t rotl[8]; /* 4 bit from every rotation key is stored here */
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uint8_t roth[2]; /* 1 bit from every rotation key is stored here */
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bool shortkey;
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} cast5_ctx_t;
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/** \fn void cast5_init(const void* key, uint16_t keylength_b, cast5_ctx_t* s);
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* \brief generate keyschedule/contex for CAST-5
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*
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* This function generates the keyschedule from the supplied key for the
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* CAST-5 cipher and stores it in a supplied ::cast5_ctx_t context.
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* \param key pointer to the key
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* \param keylength_b length of the key in bits (maximum 128 bits)
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* \param s pointer to the context
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*/
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void cast5_init(const void* key, uint16_t keylength_b, cast5_ctx_t* s);
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/** \fn void cast5_enc(void* block, const cast5_ctx_t* s);
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* \brief encrypt a block with the CAST-5 algorithm
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*
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* This function encrypts a block of 64 bits (8 bytes) with the CAST-5 algorithm.
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* It uses a keyschedule as generated by the
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* cast5_init(void* key, uint8_t keylength_b, cast5_ctx_t* s) function.
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* \param block pointer to the block which gets encrypted
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* \param s pointer to the keyschedule/context
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*/
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void cast5_enc(void* block, const cast5_ctx_t* s);
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/** \fn void cast5_dec(void* block, const cast5_ctx_t* s);
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* \brief decrypt a block with the CAST-5 algorithm
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*
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* This function decrypts a block of 64 bits (8 bytes) with the CAST-5 algorithm.
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* It uses a keyschedule as generated by the
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* cast5_init(void* key, uint8_t keylength_b, cast5_ctx_t* s) function.
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* \param block pointer to the block which gets decrypted
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* \param s pointer to the keyschedule/context
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*/
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void cast5_dec(void* block, const cast5_ctx_t* s);
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#endif
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