| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: gcipher.h,v 1.5 2004/04/21 00:37:32 mdw Exp $ |
| 4 | * |
| 5 | * Generic symmetric cipher interface |
| 6 | * |
| 7 | * (c) 1999 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Catacomb. |
| 13 | * |
| 14 | * Catacomb is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * Catacomb is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with Catacomb; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | #ifndef CATACOMB_GCIPHER_H |
| 31 | #define CATACOMB_GCIPHER_H |
| 32 | |
| 33 | #ifdef __cplusplus |
| 34 | extern "C" { |
| 35 | #endif |
| 36 | |
| 37 | /*----- Header files ------------------------------------------------------*/ |
| 38 | |
| 39 | #include <stddef.h> |
| 40 | |
| 41 | #include <mLib/bits.h> |
| 42 | |
| 43 | #ifndef CATACOMB_KEYSZ_H |
| 44 | # include "keysz.h" |
| 45 | #endif |
| 46 | |
| 47 | /*----- Generic symmetric cipher interface --------------------------------*/ |
| 48 | |
| 49 | typedef struct gcipher { |
| 50 | const struct gcipher_ops *ops; /* Pointer to cipher operations */ |
| 51 | } gcipher; |
| 52 | |
| 53 | typedef struct gcipher_ops { |
| 54 | const struct gccipher *c; /* Pointer to cipher class */ |
| 55 | void (*encrypt)(gcipher */*c*/, const void */*s*/, |
| 56 | void */*t*/, size_t /*sz*/); |
| 57 | void (*decrypt)(gcipher */*c*/, const void */*s*/, |
| 58 | void */*t*/, size_t /*sz*/); |
| 59 | void (*destroy)(gcipher */*c*/); |
| 60 | void (*setiv)(gcipher */*c*/, const void */*iv*/); |
| 61 | void (*bdry)(gcipher */*c*/); |
| 62 | } gcipher_ops; |
| 63 | |
| 64 | typedef struct gccipher { |
| 65 | const char *name; /* Cipher name */ |
| 66 | const octet *keysz; /* Preferred key size table */ |
| 67 | size_t blksz; /* Block size or zero if none */ |
| 68 | gcipher *(*init)(const void */*k*/, size_t /*sz*/); |
| 69 | } gccipher; |
| 70 | |
| 71 | #define GC_INIT(cc, k, sz) (cc)->init((k), (sz)) |
| 72 | #define GC_CLASS(cc) (cc)->ops->c |
| 73 | #define GC_ENCRYPT(c, s, t, sz) (c)->ops->encrypt((c), (s), (t), (sz)) |
| 74 | #define GC_DECRYPT(c, s, t, sz) (c)->ops->decrypt((c), (s), (t), (sz)) |
| 75 | #define GC_DESTROY(c) (c)->ops->destroy((c)) |
| 76 | #define GC_SETIV(c, iv) (c)->ops->setiv((c), (iv)) |
| 77 | #define GC_BDRY(c) (c)->ops->bdry((c)) |
| 78 | |
| 79 | /*----- Tables ------------------------------------------------------------*/ |
| 80 | |
| 81 | extern const gccipher *const gciphertab[]; |
| 82 | |
| 83 | /* --- @gcipher_byname@ --- * |
| 84 | * |
| 85 | * Arguments: @const char *p@ = pointer to name string |
| 86 | * |
| 87 | * Returns: The named cipher class, or null. |
| 88 | */ |
| 89 | |
| 90 | extern const gccipher *gcipher_byname(const char */*p*/); |
| 91 | |
| 92 | /*----- That's all, folks -------------------------------------------------*/ |
| 93 | |
| 94 | #ifdef __cplusplus |
| 95 | } |
| 96 | #endif |
| 97 | |
| 98 | #endif |