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3 Copyright (C) 2015 GNUnet e.V.
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6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
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18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @file util/test_crypto_ecc_dlog.c
23 * @brief testcase for ECC DLOG calculation
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
32 * Name of the curve we are using. Note that we have hard-coded
33 * structs that use 256 bits, so using a bigger curve will require
34 * changes that break stuff badly. The name of the curve given here
35 * must be agreed by all peers and be supported by libgcrypt.
37 #define CURVE "Ed25519"
40 * Maximum value we test dlog for.
45 * Maximum memory to use, sqrt(MAX_FACT) is a good choice.
50 * How many values do we test?
55 * Range of values to use for MATH tests.
61 * Do some DLOG operations for testing.
63 * @param edc context for ECC operations
66 test_dlog (struct GNUNET_CRYPTO_EccDlogContext *edc)
77 GNUNET_assert (0 == gcry_mpi_ec_new (&ctx, NULL, CURVE));
78 g = gcry_mpi_ec_get_point ("g", ctx, 0);
79 GNUNET_assert (NULL != g);
80 n = gcry_mpi_ec_get_mpi ("n", ctx, 0);
81 q = gcry_mpi_point_new (0);
82 fact = gcry_mpi_new (0);
83 for (i=0;i<TEST_ITER;i++)
85 fprintf (stderr, ".");
86 x = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
88 if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
91 gcry_mpi_set_ui (fact, x);
92 gcry_mpi_sub (fact, n, fact);
97 gcry_mpi_set_ui (fact, x);
99 gcry_mpi_ec_mul (q, fact, g, ctx);
101 (iret = GNUNET_CRYPTO_ecc_dlog (edc,
105 "DLOG failed for value %d (%d)\n",
111 gcry_mpi_release (fact);
112 gcry_mpi_release (n);
113 gcry_mpi_point_release (g);
114 gcry_mpi_point_release (q);
115 gcry_ctx_release (ctx);
116 fprintf (stderr, "\n");
121 * Do some arithmetic operations for testing.
123 * @param edc context for ECC operations
126 test_math (struct GNUNET_CRYPTO_EccDlogContext *edc)
134 gcry_mpi_point_t irj;
135 gcry_mpi_point_t r_inv;
136 gcry_mpi_point_t sum;
138 for (i=-MATH_MAX;i<MATH_MAX;i++)
140 ip = GNUNET_CRYPTO_ecc_dexp (edc, i);
141 for (j=-MATH_MAX;j<MATH_MAX;j++)
143 fprintf (stderr, ".");
144 jp = GNUNET_CRYPTO_ecc_dexp (edc, j);
145 GNUNET_CRYPTO_ecc_rnd (edc,
148 ir = GNUNET_CRYPTO_ecc_add (edc, ip, r);
149 irj = GNUNET_CRYPTO_ecc_add (edc, ir, jp);
150 sum = GNUNET_CRYPTO_ecc_add (edc, irj, r_inv);
151 GNUNET_assert (i + j ==
152 GNUNET_CRYPTO_ecc_dlog (edc,
154 GNUNET_CRYPTO_ecc_free (jp);
155 GNUNET_CRYPTO_ecc_free (ir);
156 GNUNET_CRYPTO_ecc_free (irj);
157 GNUNET_CRYPTO_ecc_free (r);
158 GNUNET_CRYPTO_ecc_free (r_inv);
159 GNUNET_CRYPTO_ecc_free (sum);
161 GNUNET_CRYPTO_ecc_free (ip);
163 fprintf (stderr, "\n");
169 main (int argc, char *argv[])
171 struct GNUNET_CRYPTO_EccDlogContext *edc;
173 if (! gcry_check_version ("1.6.0"))
177 ("libgcrypt has not the expected version (version %s is required).\n"),
181 if (getenv ("GNUNET_GCRYPT_DEBUG"))
182 gcry_control (GCRYCTL_SET_DEBUG_FLAGS, 1u , 0);
183 GNUNET_log_setup ("test-crypto-ecc-dlog",
186 edc = GNUNET_CRYPTO_ecc_dlog_prepare (MAX_FACT,
190 GNUNET_CRYPTO_ecc_dlog_release (edc);
194 /* end of test_crypto_ecc_dlog.c */