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| -rw-r--r-- | include/blf.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/include/blf.h b/include/blf.h new file mode 100644 index 00000000000..e0ec93b8790 --- /dev/null +++ b/include/blf.h @@ -0,0 +1,54 @@ +/* $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 |