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1 | /* -*-c-*- |
2 | * | |
3 | * AEAD schemes based on Salsa20/ChaCha and Poly1305 | |
4 | * | |
5 | * (c) 2018 Straylight/Edgeware | |
6 | */ | |
7 | ||
8 | /*----- Licensing notice --------------------------------------------------* | |
9 | * | |
10 | * This file is part of Catacomb. | |
11 | * | |
12 | * Catacomb is free software: you can redistribute it and/or modify it | |
13 | * under the terms of the GNU Library General Public License as published | |
14 | * by the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * Catacomb is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * Library General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU Library General Public | |
23 | * License along with Catacomb. If not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
25 | * USA. | |
26 | */ | |
27 | ||
28 | /*----- Notes on this construction ----------------------------------------* | |
29 | * | |
30 | * The AEAD class @chacha20_poly1305@ with a 96-bit nonce is exactly the | |
31 | * scheme specified in RFC7539. This implementation extends that | |
32 | * specification in two ways: | |
33 | * | |
34 | * * It permits ciphers other than ChaCha20: specifically ChaCha%$r$% and | |
35 | * Salsa20/%$r$% with %$r \in \{ 8, 12, 20 \}$%. | |
36 | * | |
37 | * * It allows nonces of 64, 96, and 192 bits. A 64-bit nonce matches | |
38 | * Bernstein's original specification of Salsa20 and ChaCha; the 96-bit | |
39 | * nonce matches RFC7539; and the 192-bit nonce matches Bernstein's | |
40 | * XSalsa20. The implementation uses XSalsa20 or XChaCha as appropriate | |
41 | * automatically based on the provided nonce length. | |
42 | * | |
43 | * These extensions do not significantly affect Procter's security analysis | |
44 | * except that an application should not mix nonce sizes with the same key. | |
45 | * (It is possible to do this safely, but it requires detailed understanding | |
46 | * of how everything fits together and isn't worth the effort.) | |
47 | */ | |
48 | ||
49 | #ifndef CATACOMB_LATINPOLY_H | |
50 | #define CATACOMB_LATINPOLY_H | |
51 | ||
52 | #ifdef __cplusplus | |
53 | extern "C" { | |
54 | #endif | |
55 | ||
56 | /*----- Header files ------------------------------------------------------*/ | |
57 | ||
58 | #ifndef CATACOMB_GAEAD_H | |
59 | # include "gaead.h" | |
60 | #endif | |
61 | ||
62 | /*----- Definitions -------------------------------------------------------*/ | |
63 | ||
64 | extern const gcaead | |
65 | chacha20_poly1305, chacha12_poly1305, chacha8_poly1305, | |
66 | salsa20_poly1305, salsa2012_poly1305, salsa208_poly1305; | |
67 | ||
68 | /*----- That's all, folks -------------------------------------------------*/ | |
69 | ||
70 | #ifdef __cplusplus | |
71 | } | |
72 | #endif | |
73 | ||
74 | #endif |