3 * $Id: key-pack.c,v 1.3 2004/04/08 01:36:15 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 /*----- Header files ------------------------------------------------------*/
32 #include <mLib/dstr.h>
37 /*----- Generic packing and unpacking -------------------------------------*/
39 /* --- @key_pack@ --- *
41 * Arguments: @key_packdef *kp@ = pointer to packing structure
42 * @key_data *kd@ = pointer to destination key data
43 * @dstr *d@ = pointer to tag string for the key data
45 * Returns: Error code, or zero.
47 * Use: Packs a key from a data structure.
50 int key_pack(key_packdef
*kp
, key_data
*kd
, dstr
*d
)
52 switch (kp
->kd
.e
& KF_ENCMASK
) {
54 /* --- Binary and integer keys are easy --- */
57 kd
->u
.k
= *(key_bin
*)kp
->p
;
60 kd
->u
.m
= *(mp
**)kp
->p
;
63 kd
->u
.p
= *(char **)kp
->p
;
66 kd
->u
.e
= *(ec
*)kp
->p
;
69 /* --- Encrypted keys are a little tricky --- *
71 * This works rather differently to unpacking.
76 int err
= key_pack(kp
->p
, &kkd
, d
);
78 if (key_plock(d
->buf
, &kkd
, kd
))
85 /* --- Structured keys, as ever, are a nuisance --- */
94 for (p
= kp
->p
; p
->name
; p
++) {
98 kkd
= key_structcreate(kd
, p
->name
);
99 if ((err
= key_pack(&p
->kp
, kkd
, d
)) != 0) {
110 return (KERR_BADTYPE
);
113 /* --- @key_unpack@ --- *
115 * Arguments: @key_packdef *kp@ = pointer to packing structure
116 * @key_data *kd@ = pointer to source key data
117 * @dstr *d@ = pointer to tag string for the key data
119 * Returns: Error code, or zero.
121 * Use: Unpacks a key into an appropriate data structure.
124 int key_unpack(key_packdef
*kp
, key_data
*kd
, dstr
*d
)
126 unsigned e
= kp
->kd
.e
& KF_ENCMASK
;
129 /* --- Decrypt the encrypted key --- */
131 while ((kd
->e
& KF_ENCMASK
) == KENC_ENCRYPT
) {
132 if (key_punlock(d
->buf
, kd
, &kp
->kd
)) {
140 /* --- Ensure that the key has the right type --- */
142 if ((kd
->e
& KF_ENCMASK
) != e
) {
147 /* --- Unpack the key --- *
149 * Only three possibilities left now.
154 /* --- Binary and integer keys are easy --- */
157 *(key_bin
*)kp
->p
= kd
->u
.k
;
160 *(mp
**)kp
->p
= kd
->u
.m
;
163 *(char **)kp
->p
= kd
->u
.p
;
166 *(ec
*)kp
->p
= kd
->u
.e
;
169 /* --- Structured keys take a little care --- */
172 key_packstruct
*p
, *q
;
175 /* --- Iterate over the requested subparts --- */
178 for (p
= kp
->p
; p
->name
; p
++) {
181 /* --- Build the name --- */
186 /* --- Find and unpack the subkey --- */
188 if ((kkd
= key_structfind(kd
, p
->name
)) == 0) {
189 if (!(p
->kp
.kd
.e
& KF_OPT
)) {
193 } else if ((err
= key_unpack(&p
->kp
, kkd
, d
)) != 0) {
205 /* --- Tidy up if something went wrong --- */
208 for (q
= kp
->p
; q
< p
; q
++)
209 key_unpackdone(&q
->kp
);
216 /* --- Something went wrong --- */
224 /* --- @key_unpackdone@ --- *
226 * Arguments: @key_packdef *kp@ = pointer to packing definition
230 * Use: Frees the key components contained within a packing
231 * definition, created during key unpacking.
234 void key_unpackdone(key_packdef
*kp
)
236 if (kp
->kd
.e
& KF_TEMP
)
237 key_destroy(&kp
->kd
);
238 if ((kp
->kd
.e
& KF_ENCMASK
) == KENC_STRUCT
) {
240 for (p
= kp
->p
; p
->name
; p
++)
241 key_unpackdone(&p
->kp
);
245 /*----- That's all, folks -------------------------------------------------*/