88 lines
3.5 KiB
C
88 lines
3.5 KiB
C
/****************************************************************************
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* include/crypto/blf.h
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* $OpenBSD: blf.h,v 1.7 2021/11/29 01:04:45 djm Exp $
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*
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* Blowfish - a fast block cipher designed by Bruce Schneier
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*
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* Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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****************************************************************************/
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#ifndef __INCLUDE_CRYPTO_BLF_H
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#define __INCLUDE_CRYPTO_BLF_H
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/* Schneier states the maximum key length to be 56 bytes.
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* The way how the subkeys are initialized by the key up
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* to (N+2)*4 i.e. 72 bytes are utilized.
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* Warning: For normal blowfish encryption only 56 bytes
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* of the key affect all cipherbits.
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*/
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#define BLF_N 16 /* Number of Subkeys */
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#define BLF_MAXKEYLEN ((BLF_N - 2) * 4) /* 448 bits */
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#define BLF_MAXUTILIZED ((BLF_N + 2) * 4) /* 576 bits */
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/* Blowfish context */
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typedef struct blowfishcontext
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{
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uint32_t S[4][256]; /* S-Boxes */
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uint32_t P[BLF_N + 2]; /* Subkeys */
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}
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blf_ctx;
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/* Raw access to customized Blowfish
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* blf_key is just:
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* Blowfish_initstate( state )
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* Blowfish_expand0state( state, key, keylen )
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*/
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void blowfish_encipher(FAR blf_ctx *, FAR uint32_t *);
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void blowfish_decipher(FAR blf_ctx *, FAR uint32_t *);
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void blowfish_initstate(FAR blf_ctx *);
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void blowfish_expand0state(FAR blf_ctx *, FAR const uint8_t *, uint16_t);
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void blowfish_expandstate(FAR blf_ctx *, FAR const uint8_t *,
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uint16_t, FAR const uint8_t *, uint16_t);
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/* Standard Blowfish */
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void blf_key(FAR blf_ctx *, FAR const uint8_t *, uint16_t);
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void blf_enc(FAR blf_ctx *, FAR uint32_t *, uint16_t);
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void blf_dec(FAR blf_ctx *, FAR uint32_t *, uint16_t);
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/* Converts uint8_t to uint32_t */
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uint32_t blowfish_stream2word(FAR const uint8_t *, uint16_t,
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FAR uint16_t *);
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void blf_ecb_encrypt(FAR blf_ctx *, FAR uint8_t *, uint32_t);
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void blf_ecb_decrypt(FAR blf_ctx *, FAR uint8_t *, uint32_t);
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void blf_cbc_encrypt(FAR blf_ctx *, FAR uint8_t *, FAR uint8_t *,
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uint32_t);
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void blf_cbc_decrypt(FAR blf_ctx *, FAR uint8_t *, FAR uint8_t *,
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uint32_t);
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#endif /* __INCLUDE_CRYPTO_BLF_H */
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