2792119278
Co-authored-by: Pieter Wuille <pieter@wuille.net> Co-authored-by: Tim Ruffing <crypto@timruffing.de>
40 lines
1.6 KiB
C
40 lines
1.6 KiB
C
/***********************************************************************
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* Distributed under the MIT software license, see the accompanying *
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* file COPYING or https://www.opensource.org/licenses/mit-license.php.*
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***********************************************************************/
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#ifndef SECP256K1_MODULE_ELLSWIFT_TESTS_EXHAUSTIVE_H
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#define SECP256K1_MODULE_ELLSWIFT_TESTS_EXHAUSTIVE_H
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#include "../../../include/secp256k1_ellswift.h"
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#include "main_impl.h"
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static void test_exhaustive_ellswift(const secp256k1_context *ctx, const secp256k1_ge *group) {
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int i;
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/* Note that SwiftEC/ElligatorSwift are inherently curve operations, not
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* group operations, and this test only checks the curve points which are in
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* a tiny subgroup. In that sense it can't be really seen as exhaustive as
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* it doesn't (and for computational reasons obviously cannot) test the
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* entire domain ellswift operates under. */
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for (i = 1; i < EXHAUSTIVE_TEST_ORDER; i++) {
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secp256k1_scalar scalar_i;
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unsigned char sec32[32];
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unsigned char ell64[64];
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secp256k1_pubkey pub_decoded;
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secp256k1_ge ge_decoded;
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/* Construct ellswift pubkey from exhaustive loop scalar i. */
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secp256k1_scalar_set_int(&scalar_i, i);
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secp256k1_scalar_get_b32(sec32, &scalar_i);
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CHECK(secp256k1_ellswift_create(ctx, ell64, sec32, NULL));
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/* Decode ellswift pubkey and check that it matches the precomputed group element. */
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secp256k1_ellswift_decode(ctx, &pub_decoded, ell64);
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secp256k1_pubkey_load(ctx, &ge_decoded, &pub_decoded);
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ge_equals_ge(&ge_decoded, &group[i]);
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}
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}
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#endif
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