65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
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/*
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* cifra - embedded cryptography library
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* Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com>
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*
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* To the extent possible under law, the author(s) have dedicated all
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* copyright and related and neighboring rights to this software to the
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* public domain worldwide. This software is distributed without any
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* warranty.
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*
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* You should have received a copy of the CC0 Public Domain Dedication
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* along with this software. If not, see
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* <http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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#ifndef PRP_H
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#define PRP_H
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#include <stddef.h>
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#include <stdint.h>
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/**
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* General block cipher description
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* ================================
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* This allows us to implement block cipher modes which can work
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* with different block ciphers.
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*/
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/* .. c:type:: cf_prp_block
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* Block processing function type.
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*
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* The `in` and `out` blocks may alias.
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*
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* :rtype: void
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* :param ctx: block cipher-specific context object.
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* :param in: input block.
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* :param out: output block.
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*/
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typedef void (*cf_prp_block)(void *ctx, const uint8_t *in, uint8_t *out);
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/* .. c:type:: cf_prp
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* Describes an PRP in a general way.
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*
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* .. c:member:: cf_prp.blocksz
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* Block size in bytes. Must be no more than :c:macro:`CF_MAXBLOCK`.
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*
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* .. c:member:: cf_prp.encrypt
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* Block encryption function.
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*
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* .. c:member:: cf_prp.decrypt
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* Block decryption function.
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*/
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typedef struct
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{
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size_t blocksz;
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cf_prp_block encrypt;
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cf_prp_block decrypt;
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} cf_prp;
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/* .. c:macro:: CF_MAXBLOCK
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* The maximum block cipher blocksize we support, in bytes.
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*/
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#define CF_MAXBLOCK 16
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#endif
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