git.distorted.org.uk Git - u/mdw/catacomb/blob - key-data.c

   1 /* -*-c-*-
   2  *
   3  * $Id: key-data.c,v 1.4 2000/07/16 19:51:58 mdw Exp $
   4  *
   5  * Encoding and decoding of key data
   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 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: key-data.c,v $
  33  * Revision 1.4  2000/07/16 19:51:58  mdw
  34  * Shut stupid compiler up.
  35  *
  36  * Revision 1.3  2000/06/17 11:26:03  mdw
  37  * key_structfind: track minor data structure change, and cope if the
  38  * subkey isn't available.
  39  *
  40  * Revision 1.2  2000/02/12 18:21:02  mdw
  41  * Overhaul of key management (again).
  42  *
  43  * Revision 1.1  1999/12/22 15:47:48  mdw
  44  * Major key-management revision.
  45  *
  46  */
  47
  48 /*----- Header files ------------------------------------------------------*/
  49
  50 #include <assert.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53
  54 #include <mLib/base64.h>
  55 #include <mLib/bits.h>
  56 #include <mLib/dstr.h>
  57 #include <mLib/sub.h>
  58 #include <mLib/sym.h>
  59
  60 #include "key-data.h"
  61 #include "mp.h"
  62 #include "mptext.h"
  63
  64 /*----- Setting new values ------------------------------------------------*/
  65
  66 /* --- @key_binary@ --- *
  67  *
  68  * Arguments:   @key_data *k@ = pointer to key data block
  69  *              @const void *p@ = pointer to key data
  70  *              @size_t sz@ = size of the key data
  71  *
  72  * Returns:     ---
  73  *
  74  * Use:         Sets a binary key in a key data block.
  75  */
  76
  77 void key_binary(key_data *k, const void *p, size_t sz)
  78 {
  79   k->e = (k->e & ~KF_ENCMASK) | KENC_BINARY;
  80   k->u.k.k = sub_alloc(sz);
  81   memcpy(k->u.k.k, p, sz);
  82   k->u.k.sz = sz;
  83 }
  84
  85 /* --- @key_encrypted@ --- *
  86  *
  87  * Arguments:   @key_data *k@ = pointer to key data block
  88  *              @const void *p@ = pointer to key data
  89  *              @size_t sz@ = size of the key data
  90  *
  91  * Returns:     ---
  92  *
  93  * Use:         Sets an encrypted key in a key data block.
  94  */
  95
  96 void key_encrypted(key_data *k, const void *p, size_t sz)
  97 {
  98   k->e = (k->e & ~KF_ENCMASK) | KENC_ENCRYPT;
  99   k->u.k.k = sub_alloc(sz);
 100   memcpy(k->u.k.k, p, sz);
 101   k->u.k.sz = sz;
 102 }
 103
 104 /* --- @key_mp@ --- *
 105  *
 106  * Arguments:   @key_data *k@ = pointer to key data block
 107  *              @mp *m@ = pointer to the value to set
 108  *
 109  * Returns:     ---
 110  *
 111  * Use:         Sets a multiprecision integer key in a key block.
 112  */
 113
 114 void key_mp(key_data *k, mp *m)
 115 {
 116   k->e = (k->e & ~KF_ENCMASK) | KENC_MP;
 117   k->u.m = MP_COPY(m);
 118 }
 119
 120 /* --- @key_structure@ --- *
 121  *
 122  * Arguments:   @key_data *k@ = pointer to key data block
 123  *
 124  * Returns:     ---
 125  *
 126  * Use:         Initializes a structured key type.
 127  */
 128
 129 void key_structure(key_data *k)
 130 {
 131   k->e = KENC_STRUCT;
 132   sym_create(&k->u.s);
 133 }
 134
 135 /* --- @key_structfind@ --- *
 136  *
 137  * Arguments:   @key_data *k@ = pointer to key data block
 138  *              @const char *tag@ = pointer to tag string
 139  *
 140  * Returns:     Pointer to key data block, or null.
 141  *
 142  * Use:         Looks up the tag in a structured key.
 143  */
 144
 145 key_data *key_structfind(key_data *k, const char *tag)
 146 {
 147   key_struct *ks;
 148   assert(((void)"Key is not structured",
 149           (k->e & KF_ENCMASK) == KENC_STRUCT));
 150   ks = sym_find(&k->u.s, tag, -1, 0, 0);
 151   if (!ks)
 152     return (0);
 153   return (&ks->k);
 154 }
 155
 156 /* --- @key_structcreate@ --- *
 157  *
 158  * Arguments:   @key_data *k@ = pointer to key data block
 159  *              @const char *tag@ = pointer to tag string
 160  *
 161  * Returns:     Pointer to newly created key data.
 162  *
 163  * Use:         Creates a new uninitialized subkey.
 164  */
 165
 166 key_data *key_structcreate(key_data *k, const char *tag)
 167 {
 168   key_struct *ks;
 169   unsigned f;
 170
 171   assert(((void)"Key is not structured", k->e == KENC_STRUCT));
 172   ks = sym_find(&k->u.s, tag, -1, sizeof(*ks), &f);
 173   if (f)
 174     key_destroy(&ks->k);
 175   ks->k.e = KF_TEMP;
 176   return (&ks->k);
 177 }
 178
 179 /*----- Miscellaneous operations ------------------------------------------*/
 180
 181 /* --- @key_destroy@ --- *
 182  *
 183  * Arguments:   @key_data *k@ = pointer to key data to destroy
 184  *
 185  * Returns:     ---
 186  *
 187  * Use:         Destroys a lump of key data.
 188  */
 189
 190 void key_destroy(key_data *k)
 191 {
 192   switch (k->e & KF_ENCMASK) {
 193     case KENC_BINARY:
 194     case KENC_ENCRYPT:
 195       if (k->e & KF_BURN)
 196         memset(k->u.k.k, 0, k->u.k.sz);
 197       sub_free(k->u.k.k, k->u.k.sz);
 198       break;
 199     case KENC_MP:
 200       mp_drop(k->u.m);
 201       break;
 202     case KENC_STRUCT: {
 203       sym_iter i;
 204       key_struct *ks;
 205
 206       for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) {
 207         if (!(ks->k.e & KF_TEMP))
 208           key_destroy(&ks->k);
 209       }
 210       sym_destroy(&k->u.s);
 211     } break;
 212   }
 213 }
 214
 215 /* --- @key_do@ --- *
 216  *
 217  * Arguments:   @key_data *k@ = pointer to key data block
 218  *              @const key_filter *kf@ = pointer to filter block
 219  *              @dstr *d@ = pointer to base string
 220  *              @int (*func)(key_data *kd, dstr *d, void *p@ = function
 221  *              @void *p@ = argument to function
 222  *
 223  * Returns:     Nonzero return code from function, or zero.
 224  *
 225  * Use:         Runs a function over all the leaves of a key.
 226  */
 227
 228 int key_do(key_data *k, const key_filter *kf, dstr *d,
 229            int (*func)(key_data */*kd*/, dstr */*d*/, void */*p*/),
 230            void *p)
 231 {
 232   if (!KEY_MATCH(k, kf))
 233     return (0);
 234   if ((k->e & KF_ENCMASK) != KENC_STRUCT)
 235     return (func(k, d, p));
 236   else {
 237     sym_iter i;
 238     key_struct *ks;
 239     size_t n = 0;
 240     int rc;
 241
 242     if (d)
 243       n = d->len;
 244     for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) {
 245       if (d) {
 246         d->len = n;
 247         dstr_putf(d, ".%s", SYM_NAME(ks));
 248       }
 249       if ((rc = key_do(&ks->k, kf, d, func, p)) != 0)
 250         return (rc);
 251     }
 252     return (0);
 253   }
 254 }
 255
 256 /* --- @key_copy@ --- *
 257  *
 258  * Arguments:   @key_data *kd@ = pointer to destination data block
 259  *              @key_data *k@ = pointer to source data block
 260  *              @const key_filter *kf@ = pointer to filter block
 261  *
 262  * Returns:     Nonzero if an item was actually copied.
 263  *
 264  * Use:         Copies a chunk of key data from one place to another.
 265  */
 266
 267 int key_copy(key_data *kd, key_data *k, const key_filter *kf)
 268 {
 269   kd->e = k->e;
 270
 271   if (!KEY_MATCH(kd, kf))
 272     return (0);
 273   switch (k->e & KF_ENCMASK) {
 274
 275     /* --- Plain binary data --- */
 276
 277     case KENC_BINARY:
 278     case KENC_ENCRYPT:
 279       kd->u.k.k = sub_alloc(k->u.k.sz);
 280       memcpy(kd->u.k.k, k->u.k.k, k->u.k.sz);
 281       kd->u.k.sz = k->u.k.sz;
 282       break;
 283
 284     /* --- Multiprecision integers --- */
 285
 286     case KENC_MP:
 287       kd->u.m = MP_COPY(k->u.m);
 288       break;
 289
 290     /* --- Structured key data --- */
 291
 292     case KENC_STRUCT: {
 293       sym_iter i;
 294       key_struct *ks;
 295       int rc = 0;
 296
 297       sym_create(&kd->u.s);
 298       for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) {
 299         unsigned f;
 300         key_struct *kks = sym_find(&kd->u.s, SYM_NAME(ks), -1,
 301                                    sizeof(*kks), &f);
 302         assert(((void)"Duplicate subkey tags", !f));
 303         if (key_copy(&kks->k, &ks->k, kf))
 304           rc = 1;
 305         else
 306           sym_remove(&kd->u.s, kks);
 307       }
 308       if (!rc) {
 309         sym_destroy(&kd->u.s);
 310         return (0);
 311       }
 312     } break;
 313   }
 314   return (1);
 315 }
 316
 317 /*----- That's all, folks -------------------------------------------------*/