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/* $OpenBSD: blf.h,v 1.1 1997/02/13 16:32:11 provos Exp $ */
/*
* Blowfish - a fast block cipher designed by Bruce Schneier
*
* Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
*
* Modification and redistribution in source and binary forms is
* permitted provided that due credit is given to the author and the
* OpenBSD project (for instance by leaving this copyright notice
* intact).
*/
#ifndef _BLF_H_
#define _BLF_H_
/* Schneier states the maximum key length to be 56 bytes.
* The way how the subkeys are initalized by the key up
* to (N+2)*4 i.e. 72 bytes are utilized.
* Warning: For normal blowfish encryption only 56 bytes
* of the key affect all cipherbits.
*/
#define BLF_N 16 /* Number of Subkeys */
#define BLF_MAXKEYLEN ((BLF_N-2)*4) /* 448 bits */
/* Blowfish context */
typedef struct BlowfishContext {
u_int32_t S[4][256]; /* S-Boxes */
u_int32_t P[BLF_N + 2]; /* Subkeys */
} blf_ctx;
/* Raw access to customized Blowfish
* blf_key is just:
* Blowfish_initstate( state )
* Blowfish_expand0state( state, key, keylen )
*/
void Blowfish_encipher __P((blf_ctx *, u_int32_t *, u_int32_t *));
void Blowfish_decipher __P((blf_ctx *, u_int32_t *, u_int32_t *));
void Blowfish_initstate __P((blf_ctx *));
void Blowfish_expand0state __P((blf_ctx *, u_int8_t *, u_int16_t));
void Blowfish_expandstate
__P((blf_ctx *, u_int8_t *, u_int16_t, u_int8_t *, u_int16_t));
/* Standard Blowfish */
void blf_key __P((blf_ctx *, u_int8_t *, u_int16_t));
void blf_enc __P((blf_ctx *, u_int32_t *, u_int16_t));
void blf_dec __P((blf_ctx *, u_int32_t *, u_int16_t));
/* Converts u_int8_t to u_int32_t */
u_int32_t Blowfish_stream2word __P((u_int8_t *, u_int16_t , u_int16_t *));
#endif
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