3 * $Id: key-pack.c,v 1.1 2000/06/17 10:42:41 mdw Exp $
5 * Packing and unpacking key data
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
32 * $Log: key-pack.c,v $
33 * Revision 1.1 2000/06/17 10:42:41 mdw
34 * Packing and unpacking structured keys.
38 /*----- Header files ------------------------------------------------------*/
40 #include <mLib/dstr.h>
45 /*----- Generic packing and unpacking -------------------------------------*/
47 /* --- @key_pack@ --- *
49 * Arguments: @key_packdef *kp@ = pointer to packing structure
50 * @key_data *kd@ = pointer to destination key data
51 * @dstr *d@ = pointer to tag string for the key data
53 * Returns: Error code, or zero.
55 * Use: Packs a key from a data structure.
58 int key_pack(key_packdef *kp, key_data *kd, dstr *d)
60 switch (kp->kd.e & KF_ENCMASK) {
62 /* --- Binary and integer keys are easy --- */
65 kd->u.k = *(key_bin *)kp->p;
68 kd->u.m = *(mp **)kp->p;
71 /* --- Encrypted keys are a little tricky --- *
73 * This works rather differently to unpacking.
78 int err = key_pack(kp->p, &kkd, d);
80 if (key_plock(d->buf, &kkd, kd))
87 /* --- Structured keys, as ever, are a nuisance --- */
96 for (p = kp->p; p->name; p++) {
100 kkd = key_structcreate(kd, p->name);
101 if ((err = key_pack(&p->kp, kkd, d)) != 0) {
112 return (KERR_BADTYPE);
115 /* --- @key_unpack@ --- *
117 * Arguments: @key_packdef *kp@ = pointer to packing structure
118 * @key_data *kd@ = pointer to source key data
119 * @dstr *d@ = pointer to tag string for the key data
121 * Returns: Error code, or zero.
123 * Use: Unpacks a key into an appropriate data structure.
126 int key_unpack(key_packdef *kp, key_data *kd, dstr *d)
128 unsigned e = kp->kd.e & KF_ENCMASK;
131 /* --- Decrypt the encrypted key --- */
133 while ((kd->e & KF_ENCMASK) == KENC_ENCRYPT) {
134 if (key_punlock(d->buf, kd, &kp->kd)) {
142 /* --- Ensure that the key has the right type --- */
144 if ((kd->e & KF_ENCMASK) != e) {
149 /* --- Unpack the key --- *
151 * Only three possibilities left now.
156 /* --- Binary and integer keys are easy --- */
159 *(key_bin *)kp->p = kd->u.k;
162 *(mp **)kp->p = kd->u.m;
165 /* --- Structured keys take a little care --- */
168 key_packstruct *p, *q;
171 /* --- Iterate over the requested subparts --- */
174 for (p = kp->p; p->name; p++) {
177 /* --- Build the name --- */
182 /* --- Find and unpack the subkey --- */
184 if ((kkd = key_structfind(kd, p->name)) == 0) {
185 if (!(p->kp.kd.e & KF_OPT)) {
189 } else if ((err = key_unpack(&p->kp, kkd, d)) != 0) {
201 /* --- Tidy up if something went wrong --- */
204 for (q = kp->p; q < p; q++)
205 key_unpackdone(&q->kp);
212 /* --- Something went wrong --- */
220 /* --- @key_unpackdone@ --- *
222 * Arguments: @key_packdef *kp@ = pointer to packing definition
226 * Use: Frees the key components contained within a packing
227 * definition, created during key unpacking.
230 void key_unpackdone(key_packdef *kp)
232 if (kp->kd.e & KF_TEMP)
233 key_destroy(&kp->kd);
234 if ((kp->kd.e & KF_ENCMASK) == KENC_STRUCT) {
236 for (p = kp->p; p->name; p++)
237 key_unpackdone(&p->kp);
241 /*----- That's all, folks -------------------------------------------------*/