3 * $Id: keymgmt.c,v 1.1 2001/02/03 20:26:37 mdw Exp $
5 * Key loading and storing
7 * (c) 2001 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Trivial IP Encryption (TrIPE).
14 * TrIPE is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * TrIPE 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 General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with TrIPE; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.1 2001/02/03 20:26:37 mdw
37 /*----- Header files ------------------------------------------------------*/
41 /*----- Global variables --------------------------------------------------*/
46 /*----- Static variables --------------------------------------------------*/
48 static key_file
*kf_pub
;
49 static const char *kr_priv
, *kr_pub
, *tag_priv
;
50 static fwatch w_priv
, w_pub
;
52 /*----- Main code ---------------------------------------------------------*/
54 /* --- @keymoan@ --- *
56 * Arguments: @@const char *file@ = name of the file
57 * @int line@ = line number in file
58 * @const char *msg@ = error message
59 * @void *p@ = argument pointer
63 * Use: Reports an error message about loading a key file.
66 static void keymoan(const char *file
, int line
, const char *msg
, void *p
)
68 a_warn("%s:%i: error: %s", file
, line
, msg
);
71 /* --- @loadpriv@ --- *
73 * Arguments: @dstr *d@ = string to write errors in
74 * @dh_priv *dh@ = where to store the key
76 * Returns: Zero if OK, nonzero on error.
78 * Use: Loads the private key from its keyfile.
81 static int loadpriv(dstr
*d
, dh_priv
*dh
)
84 key_packstruct kps
[DH_PRIVFETCHSZ
];
90 if (key_open(&kf
, kr_priv
, KOPEN_READ
, keymoan
, 0)) {
91 dstr_putf(d
, "error reading private keyring `%s': %s",
92 kr_priv
, strerror(errno
));
95 T( trace(T_KEYMGMT
, "keymgmt: loaded private keyring `%s'", kr_priv
); )
96 kp
= key_fetchinit(dh_privfetch
, kps
, &mydh
);
97 if ((e
= key_fetchbyname(kp
, &kf
, tag_priv
)) != 0) {
98 dstr_putf(d
, "error loading private key `%s': %s",
99 tag_priv
, key_strerror(e
));
102 dh
->dp
.p
= MP_COPY(mydh
.dp
.p
);
103 dh
->dp
.q
= MP_COPY(mydh
.dp
.q
);
104 dh
->dp
.g
= MP_COPY(mydh
.dp
.g
);
105 dh
->x
= MP_COPY(mydh
.x
);
106 dh
->y
= MP_COPY(mydh
.y
);
107 IF_TRACING(T_KEYMGMT
, {
108 trace(T_KEYMGMT
, "keymgmt: extracted private key `%s'", tag_priv
);
109 IF_TRACING(T_CRYPTO
, {
110 trace(T_CRYPTO
, "crypto: p = %s", mpstr(kpriv
.dp
.p
));
111 trace(T_CRYPTO
, "crypto: q = %s", mpstr(kpriv
.dp
.q
));
112 trace(T_CRYPTO
, "crypto: g = %s", mpstr(kpriv
.dp
.g
));
113 trace(T_CRYPTO
, "crypto: x = %s", mpstr(kpriv
.x
));
114 trace(T_CRYPTO
, "crypto: g^x = %s", mpstr(kpriv
.y
));
124 /* --- @loadpub@ --- *
126 * Arguments: @dstr *d@ = string to write errors to
128 * Returns: Zero if OK, nonzero on error.
130 * Use: Reloads the public keyring.
133 static int loadpub(dstr
*d
)
135 key_file
*kf
= CREATE(key_file
);
137 if (key_open(kf
, kr_pub
, KOPEN_READ
, keymoan
, 0)) {
138 dstr_putf(d
, "error reading public keyring `%s': %s",
139 kr_pub
, strerror(errno
));
144 T( trace(T_KEYMGMT
, "keymgmt: loaded public keyring `%s'", kr_pub
); )
148 /* --- @km_interval@ --- *
152 * Returns: Zero if OK, nonzero to force reloading of keys.
154 * Use: Called on the interval timer to perform various useful jobs.
157 int km_interval(void)
164 /* --- Check the private key first --- */
166 if (fwatch_update(&w_priv
, kr_priv
)) {
167 T( trace(T_KEYMGMT
, "keymgmt: private keyring updated: reloading..."); )
169 if (loadpriv(&d
, &dh
))
170 a_warn("%s -- ignoring changes", d
.buf
);
176 mpmont_create(&mg
, kpriv
.dp
.p
);
180 /* --- Now check the public keys --- */
182 if (fwatch_update(&w_pub
, kr_pub
)) {
183 T( trace(T_KEYMGMT
, "keymgmt: public keyring updated: reloading..."); )
187 a_warn("%s -- ignoring changes", d
.buf
);
200 /* --- @km_init@ --- *
202 * Arguments: @const char *priv@ = private keyring file
203 * @const char *pub@ = public keyring file
204 * @const char *tag@ = tag to load
208 * Use: Initializes, and loads the private key.
211 void km_init(const char *priv
, const char *pub
, const char *tag
)
218 fwatch_init(&w_priv
, kr_priv
);
219 fwatch_init(&w_pub
, kr_pub
);
222 if (loadpriv(&d
, &kpriv
))
223 die(EXIT_FAILURE
, "%s", d
.buf
);
224 mpmont_create(&mg
, kpriv
.dp
.p
);
226 die(EXIT_FAILURE
, "%s", d
.buf
);
229 /* --- @km_getpubkey@ --- *
231 * Arguments: @const char *tag@ = public key tag to load
232 * @dh_pub *kpub@ = where to put the public key
234 * Returns: Zero if OK, nonzero if it failed.
236 * Use: Fetches a public key from the keyring.
239 int km_getpubkey(const char *tag
, dh_pub
*kpub
)
241 key_packstruct kps
[DH_PUBFETCHSZ
];
246 kp
= key_fetchinit(dh_pubfetch
, kps
, &dp
);
247 e
= key_fetchbyname(kp
, kf_pub
, tag
);
250 a_warn("error loading public key `%s': %s", tag
, key_strerror(e
));
253 IF_TRACING(T_KEYMGMT
, {
254 trace(T_KEYMGMT
, "keymgmt: extracted public key `%s'", tag
);
255 IF_TRACING(T_CRYPTO
, {
256 trace(T_CRYPTO
, "crypto: p = %s", mpstr(dp
.dp
.p
));
257 trace(T_CRYPTO
, "crypto: q = %s", mpstr(dp
.dp
.q
));
258 trace(T_CRYPTO
, "crypto: g = %s", mpstr(dp
.dp
.g
));
259 trace(T_CRYPTO
, "crypto: g^x = %s", mpstr(dp
.y
));
262 if (!mp_eq(dp
.dp
.p
, kpriv
.dp
.p
) ||
263 !mp_eq(dp
.dp
.q
, kpriv
.dp
.q
) ||
264 !mp_eq(dp
.dp
.g
, kpriv
.dp
.g
)) {
265 a_warn("public key `%s' has different group from private key", tag
);
268 kpub
->dp
.p
= MP_COPY(dp
.dp
.p
);
269 kpub
->dp
.q
= MP_COPY(dp
.dp
.q
);
270 kpub
->dp
.g
= MP_COPY(dp
.dp
.g
);
271 kpub
->y
= MP_COPY(dp
.y
);
275 /*----- That's all, folks -------------------------------------------------*/