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1 | /* -*-c-*- |
2 | * | |
3 | * The Ed448 signature scheme | |
4 | * | |
5 | * (c) 2017 Straylight/Edgeware | |
6 | */ | |
7 | ||
8 | /*----- Licensing notice --------------------------------------------------* | |
9 | * | |
10 | * This file is part of secnet. | |
11 | * See README for full list of copyright holders. | |
12 | * | |
13 | * secnet is free software; you can redistribute it and/or modify it | |
14 | * under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version d of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * secnet is distributed in the hope that it will be useful, but | |
19 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
21 | * General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * version 3 along with secnet; if not, see | |
25 | * https://www.gnu.org/licenses/gpl.html. | |
26 | * | |
27 | * This file was originally part of Catacomb, but has been automatically | |
28 | * modified for incorporation into secnet: see `import-catacomb-crypto' | |
29 | * for details. | |
30 | * | |
31 | * Catacomb is free software; you can redistribute it and/or modify | |
32 | * it under the terms of the GNU Library General Public License as | |
33 | * published by the Free Software Foundation; either version 2 of the | |
34 | * License, or (at your option) any later version. | |
35 | * | |
36 | * Catacomb is distributed in the hope that it will be useful, | |
37 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
38 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
39 | * GNU Library General Public License for more details. | |
40 | * | |
41 | * You should have received a copy of the GNU Library General Public | |
42 | * License along with Catacomb; if not, write to the Free | |
43 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
44 | * MA 02111-1307, USA. | |
45 | */ | |
46 | ||
47 | /*----- Notes on the Ed448 signature scheme -------------------------------* | |
48 | * | |
49 | * This is Ed448, as described in RFC8032, using the EdDSA signature scheme | |
50 | * defined by Daniel J. Bernstein, Neils Duif, Simon Josefsson, Tanja Lange, | |
51 | * Peter Schwabe, and Bo-Yin Yang, `High-speed high-security signatures', | |
52 | * CHES 2011, https://ed25519.cr.yp.to/ed25519-20110926.pdf and `EdDSA for | |
53 | * more curves', http://ed25519.cr.yp.to/eddsa-20150704.pdf. | |
54 | * | |
55 | * This is not the signature scheme described in Hamburg's paper | |
56 | * `Ed448-Goldilocks, a new elliptic curve', EUROCRYPT 2016, | |
57 | * https://eprint.iacr.org/2015/625/, which (a) made use of his `Decaf' | |
58 | * cofactor elimination technique, and (b) was based on Schnorr rather than | |
59 | * EdDSA. | |
60 | * | |
61 | * This code implements the `Ed448' and `Ed448ph' schemes described in | |
62 | * RFC8032, though in the latter case it assumes that you've already done the | |
63 | * hashing and have provided the hash as the `message' input. | |
64 | */ | |
65 | ||
66 | #ifndef CATACOMB_ED448_H | |
67 | #define CATACOMB_ED448_H | |
68 | ||
69 | #ifdef __cplusplus | |
70 | extern "C" { | |
71 | #endif | |
72 | ||
73 | /*----- Header files ------------------------------------------------------*/ | |
74 | ||
75 | #include "fake-mLib-bits.h" | |
76 | ||
77 | /*----- Important constants -----------------------------------------------*/ | |
78 | ||
79 | #define ED448_KEYSZ 57u | |
80 | #define ED448_PUBSZ 57u | |
81 | #define ED448_SIGSZ 114u | |
82 | ||
83 | #define ED448_MAXPERSOSZ 255u | |
84 | ||
85 | /*----- Functions provided ------------------------------------------------*/ | |
86 | ||
87 | /* --- @ed448_pubkey@ --- * | |
88 | * | |
89 | * Arguments: @octet K[ED448_PUBSZ]@ = where to put the public key | |
90 | * @const void *k@ = private key | |
91 | * @size_t ksz@ = length of private key | |
92 | * | |
93 | * Returns: --- | |
94 | * | |
95 | * Use: Derives the public key from a private key. | |
96 | */ | |
97 | ||
98 | extern void ed448_pubkey(octet /*K*/[ED448_PUBSZ], | |
99 | const void */*k*/, size_t /*ksz*/); | |
100 | ||
101 | /* --- @ed448_sign@ --- * | |
102 | * | |
103 | * Arguments: @octet sig[ED448_SIGSZ]@ = where to put the signature | |
104 | * @const void *k@ = private key | |
105 | * @size_t ksz@ = length of private key | |
106 | * @const octet K[ED448_PUBSZ]@ = public key | |
107 | * @int phflag@ = whether the `message' has been hashed already | |
108 | * @const void *p@ = personalization string | |
109 | * @size_t psz@ = length of personalization string | |
110 | * @const void *m@ = message to sign | |
111 | * @size_t msz@ = length of message | |
112 | * | |
113 | * Returns: --- | |
114 | * | |
115 | * Use: Signs a message. | |
116 | */ | |
117 | ||
118 | extern void ed448_sign(octet /*sig*/[ED448_SIGSZ], | |
119 | const void */*k*/, size_t /*ksz*/, | |
120 | const octet /*K*/[ED448_PUBSZ], | |
121 | int /*phflag*/, const void */*p*/, size_t /*psz*/, | |
122 | const void */*m*/, size_t /*msz*/); | |
123 | ||
124 | /* --- @ed448_verify@ --- * | |
125 | * | |
126 | * Arguments: @const octet K[ED448_PUBSZ]@ = public key | |
127 | * @const void *m@ = message to sign | |
128 | * @int phflag@ = whether the `message' has been hashed already | |
129 | * @const void *p@ = personalization string | |
130 | * @size_t psz@ = length of personalization string | |
131 | * @size_t msz@ = length of message | |
132 | * @const octet sig[ED448_SIGSZ]@ = signature | |
133 | * | |
134 | * Returns: Zero if OK, negative on failure. | |
135 | * | |
136 | * Use: Verify a signature. | |
137 | */ | |
138 | ||
139 | extern int ed448_verify(const octet /*K*/[ED448_PUBSZ], | |
140 | int /*phflag*/, const void */*p*/, size_t /*psz*/, | |
141 | const void */*m*/, size_t /*msz*/, | |
142 | const octet /*sig*/[ED448_SIGSZ]); | |
143 | ||
144 | /*----- That's all, folks -------------------------------------------------*/ | |
145 | ||
146 | #ifdef __cplusplus | |
147 | } | |
148 | #endif | |
149 | ||
150 | #endif |