ca5bb76d2b
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18012 a1c6a512-1295-4272-9138-f99709370657
132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
/*
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* Copyright (c) 1999, 2000, 2002 Virtual Unlimited B.V.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*!\file blowfish.h
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* \brief Blowfish block cipher.
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*
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* For more information on this blockcipher, see:
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* "Applied Cryptography", second edition
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* Bruce Schneier
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* Wiley & Sons
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*
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* Also see http://www.counterpane.com/blowfish.html
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*
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* \author Bob Deblier <bob.deblier@pandora.be>
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* \ingroup BC_m BC_blowfish_m
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*/
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#ifndef _BLOWFISH_H
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#define _BLOWFISH_H
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#include "beecrypt/beecrypt.h"
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#include "beecrypt/blowfishopt.h"
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#define BLOWFISHROUNDS 16
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#define BLOWFISHPSIZE (BLOWFISHROUNDS+2)
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/*!\brief Holds all the parameters necessary for the Blowfish cipher.
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* \ingroup BC_blowfish_m
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*/
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#ifdef __cplusplus
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struct BEECRYPTAPI blowfishParam
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#else
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struct _blowfishParam
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#endif
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{
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/*!\var p
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* \brief Holds the key expansion.
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*/
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uint32_t p[BLOWFISHPSIZE];
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/*!\var s
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* \brief Holds the s-boxes.
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*/
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uint32_t s[1024];
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/*!\var fdback
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* \brief Buffer to be used by block chaining or feedback modes.
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*/
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uint32_t fdback[2];
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};
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#ifndef __cplusplus
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typedef struct _blowfishParam blowfishParam;
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*!\var blowfish
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* \brief Holds the full API description of the Blowfish algorithm.
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*/
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extern const BEECRYPTAPI blockCipher blowfish;
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/*!\fn int blowfishSetup(blowfishParam* bp, const byte* key, size_t keybits, cipherOperation
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op)
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* \brief The function performs the cipher's key expansion.
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* \param bp The cipher's parameter block.
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* \param key The key value.
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* \param keybits The number of bits in the key; legal values are: 32 to 448,
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* in multiples of 8.
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* \param op ENCRYPT or DECRYPT.
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* \retval 0 on success.
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* \retval -1 on failure.
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*/
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BEECRYPTAPI
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int blowfishSetup (blowfishParam*, const byte*, size_t, cipherOperation);
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/*!\fn int blowfishSetIV(blowfishParam* bp, const byte* iv)
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* \brief This function sets the Initialization Vector.
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* \note This function is only useful in block chaining or feedback modes.
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* \param bp The cipher's parameter block.
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* \param iv The initialization vector; may be null.
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* \retval 0 on success.
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*/
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BEECRYPTAPI
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int blowfishSetIV (blowfishParam*, const byte*);
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/*!\fn blowfishEncrypt(blowfishParam* bp, uint32_t* dst, const uint32_t* src)
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* \brief This function performs the Blowfish encryption; it encrypts one block
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* of 64 bits.
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* \param bp The cipher's parameter block.
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* \param dst The ciphertext; should be aligned on 32-bit boundary.
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* \param src The cleartext; should be aligned on 32-bit boundary.
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* \retval 0 on success.
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*/
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BEECRYPTAPI
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int blowfishEncrypt (blowfishParam*, uint32_t*, const uint32_t*);
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/*!\fn blowfishDecrypt(blowfishParam* bp, uint32_t* dst, const uint32_t* src)
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* \brief This function performs the Blowfish decryption; it Rderypts one block
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* of 64 bits.
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* \param bp The cipher's parameter block.
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* \param dst The cleartext; should be aligned on 32-bit boundary.
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* \param src The ciphertext; should be aligned on 32-bit boundary.
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* \retval 0 on success.
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*/
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BEECRYPTAPI
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int blowfishDecrypt (blowfishParam*, uint32_t*, const uint32_t*);
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BEECRYPTAPI
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uint32_t* blowfishFeedback(blowfishParam*);
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#ifdef __cplusplus
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}
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#endif
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#endif
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