82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/* seed.h */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
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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 seed.h
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* \author Daniel Otte
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* \date 2007-06-1
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* \brief declarations for seed
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* \par License
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* GPL
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*
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*/
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#ifndef SEED_H_
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#define SEED_H_
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#include <stdint.h>
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/** \typedef seed_ctx_t
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* \brief SEED context
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*
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* A variable of this type may hold the key material for the SEED cipher.
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* This context is regulary generated by the
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* void seed_init(const void * key, seed_ctx_t * ctx) function.
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*/
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typedef struct{
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uint32_t k[4];
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} seed_ctx_t;
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/******************************************************************************/
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/** \fn void seed_init(const void * key, seed_ctx_t * ctx)
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* \brief initializes context for SEED operation
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*
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* This function copys the key material into a context variable.
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*
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* \param key pointer to the key material (128 bit = 16 bytes)
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* \param ctx pointer to the context (seed_ctx_t)
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*/
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void seed_init(const void * key, seed_ctx_t * ctx);
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/** \fn void seed_enc(void * buffer,const seed_ctx_t * ctx)
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* \brief encrypt a block with SEED
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*
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* This function encrypts a block of 64 bits (8 bytes) with the SEED algorithm.
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* The round keys are computed on demand, so the context is modifyed while
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* encrypting but the original stated is restored when the function exits.
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*
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* \param buffer pointer to the block (64 bit = 8 byte) which will be encrypted
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* \param ctx pointer to the key material (seed_ctx_t)
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*/
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void seed_enc(void * buffer, const seed_ctx_t * ctx);
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/** \fn void seed_dec(void * buffer, const seed_ctx_t * ctx)
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* \brief decrypt a block with SEED
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*
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* This function decrypts a block of 64 bits (8 bytes) with the SEED algorithm.
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* The round keys are computed on demand, so the context is modifyed while
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* decrypting but the original stated is restored when the function exits.
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*
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* \param buffer pointer to the block (64 bit = 8 byte) which will be decrypted
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* \param ctx pointer to the key material (seed_ctx_t)
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*/
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void seed_dec(void * buffer, const seed_ctx_t * ctx);
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#endif /*SEED_H_*/
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