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tests: add key tweak smoke test

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Sanity check that using CKey/CPubKey directly vs using secp256k1_keypair objects
returns the same results for BIP341 key tweaking.

Co-authored-by: l0rinc <pap.lorinc@gmail.com>
This commit is contained in:
josibake 2024-07-21 18:43:00 +02:00
parent f14900b6e4
commit 5d507a0091
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GPG Key ID: 8ADCB558C4F33D65
1 changed files with 28 additions and 0 deletions
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28
src/test/key_tests.cpp
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@ -8,6 +8,7 @@
#include <key_io.h>
#include <span.h>
#include <streams.h>
#include <secp256k1_extrakeys.h>
#include <test/util/random.h>
#include <test/util/setup_common.h>
#include <uint256.h>
@ -345,4 +346,31 @@ BOOST_AUTO_TEST_CASE(bip341_test_h)
BOOST_CHECK(XOnlyPubKey::NUMS_H == H);
}
BOOST_AUTO_TEST_CASE(key_schnorr_tweak_smoke_test)
{
// Sanity check to ensure we get the same tweak using CPubKey vs secp256k1 functions
secp256k1_context* secp256k1_context_sign = secp256k1_context_create(SECP256K1_CONTEXT_SIGN);
CKey key;
key.MakeNewKey(true);
uint256 merkle_root = InsecureRand256();
// secp256k1 functions
secp256k1_keypair keypair;
BOOST_CHECK(secp256k1_keypair_create(secp256k1_context_sign, &keypair, UCharCast(key.begin())));
secp256k1_xonly_pubkey xonly_pubkey;
BOOST_CHECK(secp256k1_keypair_xonly_pub(secp256k1_context_sign, &xonly_pubkey, nullptr, &keypair));
unsigned char xonly_bytes[32];
BOOST_CHECK(secp256k1_xonly_pubkey_serialize(secp256k1_context_sign, xonly_bytes, &xonly_pubkey));
uint256 tweak_old = XOnlyPubKey(xonly_bytes).ComputeTapTweakHash(&merkle_root);
// CPubKey
CPubKey pubkey = key.GetPubKey();
uint256 tweak_new = XOnlyPubKey(pubkey).ComputeTapTweakHash(&merkle_root);
BOOST_CHECK_EQUAL(tweak_old, tweak_new);
secp256k1_context_destroy(secp256k1_context_sign);
}
BOOST_AUTO_TEST_SUITE_END()