1 /* curve25519-dh-test.c
2
3 Copyright (C) 2014 Niels Möller
4
5 This file is part of GNU Nettle.
6
7 GNU Nettle is free software: you can redistribute it and/or
8 modify it under the terms of either:
9
10 * the GNU Lesser General Public License as published by the Free
11 Software Foundation; either version 3 of the License, or (at your
12 option) any later version.
13
14 or
15
16 * the GNU General Public License as published by the Free
17 Software Foundation; either version 2 of the License, or (at your
18 option) any later version.
19
20 or both in parallel, as here.
21
22 GNU Nettle is distributed in the hope that it will be useful,
23 but WITHOUT ANY WARRANTY; without even the implied warranty of
24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 General Public License for more details.
26
27 You should have received copies of the GNU General Public License and
28 the GNU Lesser General Public License along with this program. If
29 not, see http://www.gnu.org/licenses/.
30 */
31
32 #include "testutils.h"
33
34 #include "curve25519.h"
35
36 static void
test_g(const uint8_t * s,const uint8_t * r)37 test_g (const uint8_t *s, const uint8_t *r)
38 {
39 uint8_t p[CURVE25519_SIZE];
40 curve25519_mul_g (p, s);
41 if (!MEMEQ (CURVE25519_SIZE, p, r))
42 {
43 printf ("curve25519_mul_g failure:\ns = ");
44 print_hex (CURVE25519_SIZE, s);
45 printf ("\np = ");
46 print_hex (CURVE25519_SIZE, p);
47 printf (" (bad)\nr = ");
48 print_hex (CURVE25519_SIZE, r);
49 printf (" (expected)\n");
50 abort ();
51 }
52 }
53
54 static void
test_a(const uint8_t * s,const uint8_t * b,const uint8_t * r)55 test_a (const uint8_t *s, const uint8_t *b, const uint8_t *r)
56 {
57 uint8_t p[CURVE25519_SIZE];
58 curve25519_mul (p, s, b);
59
60 if (!MEMEQ (CURVE25519_SIZE, p, r))
61 {
62 printf ("curve25519_mul failure:\ns = ");
63 print_hex (CURVE25519_SIZE, s);
64 printf ("\nb = ");
65 print_hex (CURVE25519_SIZE, b);
66 printf ("\np = ");
67 print_hex (CURVE25519_SIZE, p);
68 printf (" (bad)\nr = ");
69 print_hex (CURVE25519_SIZE, r);
70 printf (" (expected)\n");
71 abort ();
72 }
73 }
74
75 void
test_main(void)76 test_main (void)
77 {
78 /* From RFC 7748. */
79 test_g (H("77076d0a7318a57d3c16c17251b26645"
80 "df4c2f87ebc0992ab177fba51db92c2a"),
81 H("8520f0098930a754748b7ddcb43ef75a"
82 "0dbf3a0d26381af4eba4a98eaa9b4e6a"));
83 test_g (H("5dab087e624a8a4b79e17f8b83800ee6"
84 "6f3bb1292618b6fd1c2f8b27ff88e0eb"),
85 H("de9edb7d7b7dc1b4d35b61c2ece43537"
86 "3f8343c85b78674dadfc7e146f882b4f"));
87
88 test_a (H("77076d0a7318a57d3c16c17251b26645"
89 "df4c2f87ebc0992ab177fba51db92c2a"),
90 H("de9edb7d7b7dc1b4d35b61c2ece43537"
91 "3f8343c85b78674dadfc7e146f882b4f"),
92 H("4a5d9d5ba4ce2de1728e3bf480350f25"
93 "e07e21c947d19e3376f09b3c1e161742"));
94
95 test_a (H("5dab087e624a8a4b79e17f8b83800ee6"
96 "6f3bb1292618b6fd1c2f8b27ff88e0eb"),
97 H("8520f0098930a754748b7ddcb43ef75a"
98 "0dbf3a0d26381af4eba4a98eaa9b4e6a"),
99 H("4a5d9d5ba4ce2de1728e3bf480350f25"
100 "e07e21c947d19e3376f09b3c1e161742"));
101
102 /* Check that the least significant three bits (first octet) of the
103 scalar are ignored by mul_g. */
104 test_g (H("70076d0a7318a57d3c16c17251b26645"
105 "df4c2f87ebc0992ab177fba51db92c2a"),
106 H("8520f0098930a754748b7ddcb43ef75a"
107 "0dbf3a0d26381af4eba4a98eaa9b4e6a"));
108 /* Check that the most significant two bits (last octet) of the
109 scalar are ignored by mul_g. */
110 test_g (H("5dab087e624a8a4b79e17f8b83800ee6"
111 "6f3bb1292618b6fd1c2f8b27ff88e02b"),
112 H("de9edb7d7b7dc1b4d35b61c2ece43537"
113 "3f8343c85b78674dadfc7e146f882b4f"));
114
115 /* Check that the least significant three bits (first octet) of the
116 scalar are ignored by mul_a. */
117 test_a (H("5aab087e624a8a4b79e17f8b83800ee6"
118 "6f3bb1292618b6fd1c2f8b27ff88e0eb"),
119 H("8520f0098930a754748b7ddcb43ef75a"
120 "0dbf3a0d26381af4eba4a98eaa9b4e6a"),
121 H("4a5d9d5ba4ce2de1728e3bf480350f25"
122 "e07e21c947d19e3376f09b3c1e161742"));
123
124 /* Check that the most significant two bits (last octet) of the
125 scalar are ignored by mul_g. */
126 test_a (H("77076d0a7318a57d3c16c17251b26645"
127 "df4c2f87ebc0992ab177fba51db92cea"),
128 H("de9edb7d7b7dc1b4d35b61c2ece43537"
129 "3f8343c85b78674dadfc7e146f882b4f"),
130 H("4a5d9d5ba4ce2de1728e3bf480350f25"
131 "e07e21c947d19e3376f09b3c1e161742"));
132
133 /* Check that the most significant bit (last octet) of the x
134 coordinate is ignored. */
135 test_a (H("77076d0a7318a57d3c16c17251b26645"
136 "df4c2f87ebc0992ab177fba51db92c2a"),
137 H("de9edb7d7b7dc1b4d35b61c2ece43537"
138 "3f8343c85b78674dadfc7e146f882bcf"),
139 H("4a5d9d5ba4ce2de1728e3bf480350f25"
140 "e07e21c947d19e3376f09b3c1e161742"));
141 }
142