git.distorted.org.uk Git - u/mdw/catacomb/blob - ghash.h

   1 /* -*-c-*-
   2  *
   3  * $Id$
   4  *
   5  * Generic hash function 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_GHASH_H
  31 #define CATACOMB_GHASH_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 /*----- Generic hash function interface -----------------------------------*/
  44
  45 typedef struct ghash {
  46   const struct ghash_ops *ops;          /* Pointer to hash operations */
  47 } ghash;
  48
  49 typedef struct ghash_ops {
  50   const struct gchash *c;               /* Pointer to hash class */
  51   void (*hash)(ghash */*h*/, const void */*p*/, size_t /*sz*/); /* Hash */
  52   octet *(*done)(ghash */*h*/, void */*buf*/); /* Write result */
  53   void (*destroy)(ghash */*h*/);        /* Destroy hash block */
  54   ghash *(*copy)(ghash */*h*/);         /* Make a copy of the hash context */
  55 } ghash_ops;
  56
  57 #define GH_INIT(ch)             (ch)->init()
  58 #define GH_CLASS(h)             (h)->ops->c
  59 #define GH_HASH(h, p, sz)       (h)->ops->hash((h), (p), (sz))
  60 #define GH_DONE(h, buf)         (h)->ops->done((h), (buf))
  61 #define GH_DESTROY(h)           (h)->ops->destroy((h))
  62 #define GH_COPY(h)              (h)->ops->copy((h))
  63
  64 #define GH_HASHU_(h, n, W)  do {                                        \
  65   TY_U##W n_ = (n); octet b_[SZ_##W];                                   \
  66   STORE##W(b_, n_); GH_HASH((h), b_, SZ_##W);                           \
  67 } while (0)
  68 #define GH_HASHU8(h, n)  GH_HASHU_((h), (n), 8)
  69 #define GH_HASHU16(h, n) GH_HASHU_((h), (n), 16)
  70 #define GH_HASHU16_B(h, n) GH_HASHU_((h), (n), 16_B)
  71 #define GH_HASHU16_L(h, n) GH_HASHU_((h), (n), 16_L)
  72 #define GH_HASHU24(h, n) GH_HASHU_((h), (n), 24)
  73 #define GH_HASHU24_B(h, n) GH_HASHU_((h), (n), 24_B)
  74 #define GH_HASHU24_L(h, n) GH_HASHU_((h), (n), 24_L)
  75 #define GH_HASHU32(h, n) GH_HASHU_((h), (n), 32)
  76 #define GH_HASHU32_B(h, n) GH_HASHU_((h), (n), 32_B)
  77 #define GH_HASHU32_L(h, n) GH_HASHU_((h), (n), 32_L)
  78 #ifdef HAVE_UINT64
  79 #  define GH_HASHU64(h, n) GH_HASHU_((h), (n), 64)
  80 #  define GH_HASHU64_B(h, n) GH_HASHU_((h), (n), 64_B)
  81 #  define GH_HASHU64_L(h, n) GH_HASHU_((h), (n), 64_L)
  82 #endif
  83
  84 #define GH_HASHBUF_(h, p, sz, W) do {                                   \
  85   size_t sz_ = (sz); assert(sz_ <= MASK##W);                            \
  86   GH_HASHU_(h, sz_, W); GH_HASH(h, (p), sz_);                           \
  87 } while (0)
  88 #define GH_HASHBUF8(h, p, sz) GH_HASHBUF_((h), (p), (sz), 8)
  89 #define GH_HASHBUF16(h, p, sz) GH_HASHBUF_((h), (p), (sz), 16)
  90 #define GH_HASHBUF16_L(h, p, sz) GH_HASHBUF_((h), (p), (sz), 16_L)
  91 #define GH_HASHBUF16_B(h, p, sz) GH_HASHBUF_((h), (p), (sz), 16_B)
  92 #define GH_HASHBUF24(h, p, sz) GH_HASHBUF_((h), (p), (sz), 24)
  93 #define GH_HASHBUF24_L(h, p, sz) GH_HASHBUF_((h), (p), (sz), 24_L)
  94 #define GH_HASHBUF24_B(h, p, sz) GH_HASHBUF_((h), (p), (sz), 24_B)
  95 #define GH_HASHBUF32(h, p, sz) GH_HASHBUF_((h), (p), (sz), 32)
  96 #define GH_HASHBUF32_L(h, p, sz) GH_HASHBUF_((h), (p), (sz), 32_L)
  97 #define GH_HASHBUF32_B(h, p, sz) GH_HASHBUF_((h), (p), (sz), 32_B)
  98 #ifdef HAVE_UINT64
  99 #  define GH_HASHBUF64(h, p, sz) GH_HASHBUF_((h), (p), (sz), 64)
 100 #  define GH_HASHBUF64_L(h, p, sz) GH_HASHBUF_((h), (p), (sz), 64_L)
 101 #  define GH_HASHBUF64_B(h, p, sz) GH_HASHBUF_((h), (p), (sz), 64_B)
 102 #endif
 103
 104 #define GH_HASHSTR_(h, p, W) do {                                       \
 105   const char *p_ = (p); GH_HASHBUF_((h), p_, strlen(p_), W);            \
 106 } while (0)
 107 #define GH_HASHSTR8(h, p) GH_HASHSTR_((h), (p), 8)
 108 #define GH_HASHSTR16(h, p) GH_HASHSTR_((h), (p), 16)
 109 #define GH_HASHSTR16_L(h, p) GH_HASHSTR_((h), (p), 16_L)
 110 #define GH_HASHSTR16_B(h, p) GH_HASHSTR_((h), (p), 16_B)
 111 #define GH_HASHSTR24(h, p) GH_HASHSTR_((h), (p), 24)
 112 #define GH_HASHSTR24_L(h, p) GH_HASHSTR_((h), (p), 24_L)
 113 #define GH_HASHSTR24_B(h, p) GH_HASHSTR_((h), (p), 24_B)
 114 #define GH_HASHSTR32(h, p) GH_HASHSTR_((h), (p), 32)
 115 #define GH_HASHSTR32_L(h, p) GH_HASHSTR_((h), (p), 32_L)
 116 #define GH_HASHSTR32_B(h, p) GH_HASHSTR_((h), (p), 32_B)
 117 #ifdef HAVE_UINT64
 118 #  define GH_HASHSTR32(h, p) GH_HASHSTR_((h), (p), 64)
 119 #  define GH_HASHSTR32_L(h, p) GH_HASHSTR_((h), (p), 64_L)
 120 #  define GH_HASHSTR32_B(h, p) GH_HASHSTR_((h), (p), 64_B)
 121 #endif
 122
 123 #define GH_HASHSTRZ(h, p) do {                                          \
 124   const char *p_ = (p); GH_HASH((h), p_, strlen(p_) + 1);               \
 125 } while (0)
 126 #define GH_HASHSTR(h, p) do {                                           \
 127   const char *p_ = (p); GH_HASH((h), p_, strlen(p_));                   \
 128 } while (0)
 129
 130 typedef struct gchash {
 131   const char *name;                     /* Name of the hash function */
 132   size_t hashsz;                        /* Size of output hash */
 133   ghash *(*init)(void);                 /* Create a new hash instance */
 134   size_t bufsz;                         /* Buffer size, or zero */
 135 } gchash;
 136
 137 /*----- Tables ------------------------------------------------------------*/
 138
 139 extern const gchash *const ghashtab[];
 140
 141 /* --- @ghash_byname@ --- *
 142  *
 143  * Arguments:   @const char *p@ = pointer to name string
 144  *
 145  * Returns:     The named cipher class, or null.
 146  */
 147
 148 extern const gchash *ghash_byname(const char */*p*/);
 149
 150 /*----- That's all, folks -------------------------------------------------*/
 151
 152 #ifdef __cplusplus
 153   }
 154 #endif
 155
 156 #endif