a9353351ae0cba1ad33a6fe6911d30f7d6a357e9
3 * Cryptographic challenges
5 * (c) 2005 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Trivial IP Encryption (TrIPE).
12 * TrIPE is free software: you can redistribute it and/or modify it under
13 * the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 3 of the License, or (at your
15 * option) any later version.
17 * TrIPE is distributed in the hope that it will be useful, but WITHOUT
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 * You should have received a copy of the GNU General Public License
23 * along with TrIPE. If not, see <https://www.gnu.org/licenses/>.
26 /*----- Header files ------------------------------------------------------*/
30 /*----- Static variables --------------------------------------------------*/
32 static bulkchal
*bchal
;
36 /*----- Challenges --------------------------------------------------------*/
38 /* --- @c_genkey@ --- *
44 * Use: Generates a new challenge key.
47 static void c_genkey(void)
49 if (bchal
&& bchal
->ops
== master
->algs
.bulk
->ops
&& oseq
< 0x07ffffff)
51 if (bchal
) bchal
->ops
->freechal(bchal
);
52 bchal
= master
->algs
.bulk
->ops
->genchal(master
->algs
.bulk
);
53 bchal
->ops
= master
->algs
.bulk
->ops
;
60 * Arguments: @buf *b@ = where to put the challenge
62 * Returns: Zero if OK, nonzero on error.
64 * Use: Issues a new challenge.
73 if (buf_putu32(b
, oseq
++) || !buf_get(b
, bchal
->tagsz
)) return (-1);
74 if (bchal
->ops
->chaltag(bchal
, p
, 4, p
+ 4)) return (-1);
76 trace(T_CHAL
, "chal: issuing challenge %lu", (unsigned long)(oseq
- 1));
77 trace_block(T_CRYPTO
, "chal: challenge block", p
, BCUR(b
) - p
);
82 /* --- @c_check@ --- *
84 * Arguments: @buf *b@ = where to find the challenge
86 * Returns: Zero if OK, nonzero if it didn't work.
88 * Use: Checks a challenge. On failure, the buffer is broken.
98 a_warn("CHAL", "impossible-challenge", A_END
);
101 sz
= 4 + bchal
->tagsz
;
102 if ((p
= buf_get(b
, sz
)) == 0) {
103 a_warn("CHAL", "invalid-challenge", A_END
);
106 IF_TRACING(T_CHAL
, trace_block(T_CRYPTO
, "chal: check challenge", p
, sz
); )
107 if (bchal
->ops
->chalvrf(bchal
, p
, 4, p
+ 4)) {
108 a_warn("CHAL", "incorrect-tag", A_END
);
112 if (seq_check(&iseq
, seq
, "CHAL"))
114 T( trace(T_CHAL
, "chal: checked challenge %lu", (unsigned long)seq
); )
122 /*----- That's all, folks -------------------------------------------------*/