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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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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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++)
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);
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 */