/*********************************************************************** * Distributed under the MIT software license, see the accompanying * * file COPYING or https://www.opensource.org/licenses/mit-license.php.* ***********************************************************************/ #ifndef SECP256K1_MODULE_MUSIG_TESTS_IMPL_H #define SECP256K1_MODULE_MUSIG_TESTS_IMPL_H #include #include #include "../../../include/secp256k1.h" #include "../../../include/secp256k1_extrakeys.h" #include "../../../include/secp256k1_musig.h" #include "session.h" #include "keyagg.h" #include "../../scalar.h" #include "../../field.h" #include "../../group.h" #include "../../hash.h" #include "../../util.h" #include "../../unit_test.h" #include "vectors.h" static int create_keypair_and_pk(secp256k1_keypair *keypair, secp256k1_pubkey *pk, const unsigned char *sk) { int ret; secp256k1_keypair keypair_tmp; ret = secp256k1_keypair_create(CTX, &keypair_tmp, sk); ret &= secp256k1_keypair_pub(CTX, pk, &keypair_tmp); if (keypair != NULL) { *keypair = keypair_tmp; } return ret; } /* Just a simple (non-tweaked) 2-of-2 MuSig aggregate, sign, verify * test. */ static void musig_simple_test_internal(void) { unsigned char sk[2][32]; secp256k1_keypair keypair[2]; secp256k1_musig_pubnonce pubnonce[2]; const secp256k1_musig_pubnonce *pubnonce_ptr[2]; secp256k1_musig_aggnonce aggnonce; unsigned char msg[32]; secp256k1_xonly_pubkey agg_pk; secp256k1_musig_keyagg_cache keyagg_cache; unsigned char session_secrand[2][32]; secp256k1_musig_secnonce secnonce[2]; secp256k1_pubkey pk[2]; const secp256k1_pubkey *pk_ptr[2]; secp256k1_musig_partial_sig partial_sig[2]; const secp256k1_musig_partial_sig *partial_sig_ptr[2]; unsigned char final_sig[64]; secp256k1_musig_session session; int i; testrand256(msg); for (i = 0; i < 2; i++) { testrand256(sk[i]); pk_ptr[i] = &pk[i]; pubnonce_ptr[i] = &pubnonce[i]; partial_sig_ptr[i] = &partial_sig[i]; CHECK(create_keypair_and_pk(&keypair[i], &pk[i], sk[i])); if (i == 0) { testrand256(session_secrand[i]); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[i], &pubnonce[i], session_secrand[i], sk[i], &pk[i], NULL, NULL, NULL) == 1); } else { uint64_t nonrepeating_cnt = 0; CHECK(secp256k1_musig_nonce_gen_counter(CTX, &secnonce[i], &pubnonce[i], nonrepeating_cnt, &keypair[i], NULL, NULL, NULL) == 1); } } CHECK(secp256k1_musig_pubkey_agg(CTX, &agg_pk, &keyagg_cache, pk_ptr, 2) == 1); CHECK(secp256k1_musig_nonce_agg(CTX, &aggnonce, pubnonce_ptr, 2) == 1); CHECK(secp256k1_musig_nonce_process(CTX, &session, &aggnonce, msg, &keyagg_cache) == 1); for (i = 0; i < 2; i++) { CHECK(secp256k1_musig_partial_sign(CTX, &partial_sig[i], &secnonce[i], &keypair[i], &keyagg_cache, &session) == 1); CHECK(secp256k1_musig_partial_sig_verify(CTX, &partial_sig[i], &pubnonce[i], &pk[i], &keyagg_cache, &session) == 1); } CHECK(secp256k1_musig_partial_sig_agg(CTX, final_sig, &session, partial_sig_ptr, 2) == 1); CHECK(secp256k1_schnorrsig_verify(CTX, final_sig, msg, sizeof(msg), &agg_pk) == 1); } /* Generate two pubnonces such that both group elements of their sum (calculated * with secp256k1_musig_sum_pubnonces) are infinity. */ static void pubnonce_summing_to_inf(secp256k1_musig_pubnonce *pubnonce) { secp256k1_ge ge[2]; int i; secp256k1_gej summed_pubnonces[2]; const secp256k1_musig_pubnonce *pubnonce_ptr[2]; testutil_random_ge_test(&ge[0]); testutil_random_ge_test(&ge[1]); for (i = 0; i < 2; i++) { secp256k1_musig_pubnonce_save(&pubnonce[i], ge); pubnonce_ptr[i] = &pubnonce[i]; secp256k1_ge_neg(&ge[0], &ge[0]); secp256k1_ge_neg(&ge[1], &ge[1]); } secp256k1_musig_sum_pubnonces(CTX, summed_pubnonces, pubnonce_ptr, 2); CHECK(secp256k1_gej_is_infinity(&summed_pubnonces[0])); CHECK(secp256k1_gej_is_infinity(&summed_pubnonces[1])); } int memcmp_and_randomize(unsigned char *value, const unsigned char *expected, size_t len) { int ret; size_t i; ret = secp256k1_memcmp_var(value, expected, len); for (i = 0; i < len; i++) { value[i] = testrand_bits(8); } return ret; } static void musig_api_tests(void) { secp256k1_musig_partial_sig partial_sig[2]; const secp256k1_musig_partial_sig *partial_sig_ptr[2]; secp256k1_musig_partial_sig invalid_partial_sig; const secp256k1_musig_partial_sig *invalid_partial_sig_ptr[2]; unsigned char pre_sig[64]; unsigned char buf[32]; unsigned char sk[2][32]; secp256k1_keypair keypair[2]; secp256k1_keypair invalid_keypair; unsigned char max64[64]; unsigned char zeros132[132] = { 0 }; unsigned char session_secrand[2][32]; unsigned char nonrepeating_cnt = 0; secp256k1_musig_secnonce secnonce[2]; secp256k1_musig_secnonce secnonce_tmp; secp256k1_musig_secnonce invalid_secnonce; secp256k1_musig_pubnonce pubnonce[2]; const secp256k1_musig_pubnonce *pubnonce_ptr[2]; unsigned char pubnonce_ser[66]; secp256k1_musig_pubnonce inf_pubnonce[2]; const secp256k1_musig_pubnonce *inf_pubnonce_ptr[2]; secp256k1_musig_pubnonce invalid_pubnonce; const secp256k1_musig_pubnonce *invalid_pubnonce_ptr[1]; secp256k1_musig_aggnonce aggnonce; unsigned char aggnonce_ser[66]; unsigned char msg[32]; secp256k1_xonly_pubkey agg_pk; secp256k1_pubkey full_agg_pk; secp256k1_musig_keyagg_cache keyagg_cache; secp256k1_musig_keyagg_cache invalid_keyagg_cache; secp256k1_musig_session session; secp256k1_musig_session invalid_session; secp256k1_pubkey pk[2]; const secp256k1_pubkey *pk_ptr[2]; secp256k1_pubkey invalid_pk; const secp256k1_pubkey *invalid_pk_ptr2[2]; const secp256k1_pubkey *invalid_pk_ptr3[3]; unsigned char tweak[32]; int i; /** setup **/ memset(max64, 0xff, sizeof(max64)); memset(&invalid_keypair, 0, sizeof(invalid_keypair)); memset(&invalid_pk, 0, sizeof(invalid_pk)); memset(&invalid_secnonce, 0, sizeof(invalid_secnonce)); memset(&invalid_partial_sig, 0, sizeof(invalid_partial_sig)); pubnonce_summing_to_inf(inf_pubnonce); /* Simulate structs being uninitialized by setting it to 0s. We don't want * to produce undefined behavior by actually providing uninitialized * structs. */ memset(&invalid_keyagg_cache, 0, sizeof(invalid_keyagg_cache)); memset(&invalid_pk, 0, sizeof(invalid_pk)); memset(&invalid_pubnonce, 0, sizeof(invalid_pubnonce)); memset(&invalid_session, 0, sizeof(invalid_session)); testrand256(msg); testrand256(tweak); for (i = 0; i < 2; i++) { pk_ptr[i] = &pk[i]; invalid_pk_ptr2[i] = &invalid_pk; invalid_pk_ptr3[i] = &pk[i]; pubnonce_ptr[i] = &pubnonce[i]; inf_pubnonce_ptr[i] = &inf_pubnonce[i]; partial_sig_ptr[i] = &partial_sig[i]; invalid_partial_sig_ptr[i] = &partial_sig[i]; testrand256(session_secrand[i]); testrand256(sk[i]); CHECK(create_keypair_and_pk(&keypair[i], &pk[i], sk[i])); } invalid_pubnonce_ptr[0] = &invalid_pubnonce; invalid_partial_sig_ptr[0] = &invalid_partial_sig; /* invalid_pk_ptr3 has two valid, one invalid pk, which is important to test * musig_pubkey_agg */ invalid_pk_ptr3[2] = &invalid_pk; /** main test body **/ /** Key aggregation **/ CHECK(secp256k1_musig_pubkey_agg(CTX, &agg_pk, &keyagg_cache, pk_ptr, 2) == 1); CHECK(secp256k1_musig_pubkey_agg(CTX, NULL, &keyagg_cache, pk_ptr, 2) == 1); CHECK(secp256k1_musig_pubkey_agg(CTX, &agg_pk, NULL, pk_ptr, 2) == 1); /* check that NULL in array of public key pointers is not allowed */ for (i = 0; i < 2; i++) { const secp256k1_pubkey *original_ptr = pk_ptr[i]; pk_ptr[i] = NULL; CHECK_ILLEGAL(CTX, secp256k1_musig_pubkey_agg(CTX, &agg_pk, NULL, pk_ptr, 2)); pk_ptr[i] = original_ptr; } CHECK_ILLEGAL(CTX, secp256k1_musig_pubkey_agg(CTX, &agg_pk, &keyagg_cache, NULL, 2)); CHECK(memcmp_and_randomize(agg_pk.data, zeros132, sizeof(agg_pk.data)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_pubkey_agg(CTX, &agg_pk, &keyagg_cache, invalid_pk_ptr2, 2)); CHECK(memcmp_and_randomize(agg_pk.data, zeros132, sizeof(agg_pk.data)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_pubkey_agg(CTX, &agg_pk, &keyagg_cache, invalid_pk_ptr3, 3)); CHECK(memcmp_and_randomize(agg_pk.data, zeros132, sizeof(agg_pk.data)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_pubkey_agg(CTX, &agg_pk, &keyagg_cache, pk_ptr, 0)); CHECK(memcmp_and_randomize(agg_pk.data, zeros132, sizeof(agg_pk.data)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_pubkey_agg(CTX, &agg_pk, &keyagg_cache, NULL, 0)); CHECK(memcmp_and_randomize(agg_pk.data, zeros132, sizeof(agg_pk.data)) == 0); CHECK(secp256k1_musig_pubkey_agg(CTX, &agg_pk, &keyagg_cache, pk_ptr, 2) == 1); /* pubkey_get */ CHECK(secp256k1_musig_pubkey_get(CTX, &full_agg_pk, &keyagg_cache) == 1); CHECK_ILLEGAL(CTX, secp256k1_musig_pubkey_get(CTX, NULL, &keyagg_cache)); CHECK_ILLEGAL(CTX, secp256k1_musig_pubkey_get(CTX, &full_agg_pk, NULL)); CHECK(secp256k1_memcmp_var(&full_agg_pk, zeros132, sizeof(full_agg_pk)) == 0); /** Tweaking **/ { int (*tweak_func[2]) (const secp256k1_context* ctx, secp256k1_pubkey *output_pubkey, secp256k1_musig_keyagg_cache *keyagg_cache, const unsigned char *tweak32); tweak_func[0] = secp256k1_musig_pubkey_ec_tweak_add; tweak_func[1] = secp256k1_musig_pubkey_xonly_tweak_add; for (i = 0; i < 2; i++) { secp256k1_pubkey tmp_output_pk; secp256k1_musig_keyagg_cache tmp_keyagg_cache = keyagg_cache; CHECK((*tweak_func[i])(CTX, &tmp_output_pk, &tmp_keyagg_cache, tweak) == 1); /* Reset keyagg_cache */ tmp_keyagg_cache = keyagg_cache; CHECK((*tweak_func[i])(CTX, NULL, &tmp_keyagg_cache, tweak) == 1); tmp_keyagg_cache = keyagg_cache; CHECK_ILLEGAL(CTX, (*tweak_func[i])(CTX, &tmp_output_pk, NULL, tweak)); CHECK(memcmp_and_randomize(tmp_output_pk.data, zeros132, sizeof(tmp_output_pk.data)) == 0); tmp_keyagg_cache = keyagg_cache; CHECK_ILLEGAL(CTX, (*tweak_func[i])(CTX, &tmp_output_pk, &tmp_keyagg_cache, NULL)); CHECK(memcmp_and_randomize(tmp_output_pk.data, zeros132, sizeof(tmp_output_pk.data)) == 0); tmp_keyagg_cache = keyagg_cache; CHECK((*tweak_func[i])(CTX, &tmp_output_pk, &tmp_keyagg_cache, max64) == 0); CHECK(memcmp_and_randomize(tmp_output_pk.data, zeros132, sizeof(tmp_output_pk.data)) == 0); tmp_keyagg_cache = keyagg_cache; /* Uninitialized keyagg_cache */ CHECK_ILLEGAL(CTX, (*tweak_func[i])(CTX, &tmp_output_pk, &invalid_keyagg_cache, tweak)); CHECK(memcmp_and_randomize(tmp_output_pk.data, zeros132, sizeof(tmp_output_pk.data)) == 0); } } /** Session creation with nonce_gen **/ CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], sk[0], &pk[0], msg, &keyagg_cache, max64) == 1); /* nonce_gen, if successful, sets session_secrand to the zero array, which * makes subsequent nonce_gen calls with the same session_secrand fail. So * check that session_secrand is indeed the zero array and fill it with * random values again. */ CHECK(memcmp_and_randomize(session_secrand[0], zeros132, sizeof(session_secrand[0])) == 0); CHECK_ILLEGAL(STATIC_CTX, secp256k1_musig_nonce_gen(STATIC_CTX, &secnonce[0], &pubnonce[0], session_secrand[0], sk[0], &pk[0], msg, &keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen(CTX, NULL, &pubnonce[0], session_secrand[0], sk[0], &pk[0], msg, &keyagg_cache, max64)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen(CTX, &secnonce[0], NULL, session_secrand[0], sk[0], &pk[0], msg, &keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], NULL, sk[0], &pk[0], msg, &keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); /* session_secrand = 0 is disallowed because it indicates a faulty RNG */ memcpy(&session_secrand[0], zeros132, sizeof(session_secrand[0])); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], zeros132, sk[0], &pk[0], msg, &keyagg_cache, max64) == 0); CHECK(memcmp_and_randomize(session_secrand[0], zeros132, sizeof(session_secrand[0])) == 0); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], NULL, &pk[0], msg, &keyagg_cache, max64) == 1); CHECK(memcmp_and_randomize(session_secrand[0], zeros132, sizeof(session_secrand[0])) == 0); /* invalid seckey */ CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], max64, &pk[0], msg, &keyagg_cache, max64) == 0); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], sk[0], NULL, msg, &keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], sk[0], &invalid_pk, msg, &keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], sk[0], &pk[0], NULL, &keyagg_cache, max64) == 1); CHECK(memcmp_and_randomize(session_secrand[0], zeros132, sizeof(session_secrand[0])) == 0); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], sk[0], &pk[0], msg, NULL, max64) == 1); CHECK(memcmp_and_randomize(session_secrand[0], zeros132, sizeof(session_secrand[0])) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], sk[0], &pk[0], msg, &invalid_keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], sk[0], &pk[0], msg, &keyagg_cache, NULL) == 1); CHECK(memcmp_and_randomize(session_secrand[0], zeros132, sizeof(session_secrand[0])) == 0); /* Every in-argument except session_secrand and pubkey can be NULL */ CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], NULL, &pk[0], NULL, NULL, NULL) == 1); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[1], &pubnonce[1], session_secrand[1], sk[1], &pk[1], NULL, NULL, NULL) == 1); /** Session creation with nonce_gen_counter **/ CHECK(secp256k1_musig_nonce_gen_counter(CTX, &secnonce[0], &pubnonce[0], nonrepeating_cnt, &keypair[0], msg, &keyagg_cache, max64) == 1); CHECK_ILLEGAL(STATIC_CTX, secp256k1_musig_nonce_gen_counter(STATIC_CTX, &secnonce[0], &pubnonce[0], nonrepeating_cnt, &keypair[0], msg, &keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen_counter(CTX, NULL, &pubnonce[0], nonrepeating_cnt, &keypair[0], msg, &keyagg_cache, max64)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen_counter(CTX, &secnonce[0], NULL, nonrepeating_cnt, &keypair[0], msg, &keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); /* using nonce_gen_counter requires keypair */ CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen_counter(CTX, &secnonce[0], &pubnonce[0], nonrepeating_cnt, NULL, msg, &keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); /* invalid keypair */ CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen_counter(CTX, &secnonce[0], &pubnonce[0], nonrepeating_cnt, &invalid_keypair, msg, &keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK(secp256k1_musig_nonce_gen_counter(CTX, &secnonce[0], &pubnonce[0], nonrepeating_cnt, &keypair[0], NULL, &keyagg_cache, max64) == 1); CHECK(secp256k1_musig_nonce_gen_counter(CTX, &secnonce[0], &pubnonce[0], nonrepeating_cnt, &keypair[0], msg, NULL, max64) == 1); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_gen_counter(CTX, &secnonce[0], &pubnonce[0], nonrepeating_cnt, &keypair[0], msg, &invalid_keyagg_cache, max64)); CHECK(memcmp_and_randomize(secnonce[0].data, zeros132, sizeof(secnonce[0].data)) == 0); CHECK(secp256k1_musig_nonce_gen_counter(CTX, &secnonce[0], &pubnonce[0], nonrepeating_cnt,&keypair[0], msg, &keyagg_cache, NULL) == 1); /* Every in-argument except nonrepeating_cnt and keypair can be NULL */ CHECK(secp256k1_musig_nonce_gen_counter(CTX, &secnonce[0], &pubnonce[0], nonrepeating_cnt, &keypair[0], NULL, NULL, NULL) == 1); CHECK(secp256k1_musig_nonce_gen_counter(CTX, &secnonce[1], &pubnonce[1], nonrepeating_cnt, &keypair[1], NULL, NULL, NULL) == 1); /** Serialize and parse public nonces **/ CHECK_ILLEGAL(CTX, secp256k1_musig_pubnonce_serialize(CTX, NULL, &pubnonce[0])); CHECK_ILLEGAL(CTX, secp256k1_musig_pubnonce_serialize(CTX, pubnonce_ser, NULL)); CHECK(memcmp_and_randomize(pubnonce_ser, zeros132, sizeof(pubnonce_ser)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_pubnonce_serialize(CTX, pubnonce_ser, &invalid_pubnonce)); CHECK(memcmp_and_randomize(pubnonce_ser, zeros132, sizeof(pubnonce_ser)) == 0); CHECK(secp256k1_musig_pubnonce_serialize(CTX, pubnonce_ser, &pubnonce[0]) == 1); CHECK(secp256k1_musig_pubnonce_parse(CTX, &pubnonce[0], pubnonce_ser) == 1); CHECK_ILLEGAL(CTX, secp256k1_musig_pubnonce_parse(CTX, NULL, pubnonce_ser)); CHECK_ILLEGAL(CTX, secp256k1_musig_pubnonce_parse(CTX, &pubnonce[0], NULL)); CHECK(secp256k1_musig_pubnonce_parse(CTX, &pubnonce[0], zeros132) == 0); CHECK(secp256k1_musig_pubnonce_parse(CTX, &pubnonce[0], pubnonce_ser) == 1); { /* Check that serialize and parse results in the same value */ secp256k1_musig_pubnonce tmp; CHECK(secp256k1_musig_pubnonce_serialize(CTX, pubnonce_ser, &pubnonce[0]) == 1); CHECK(secp256k1_musig_pubnonce_parse(CTX, &tmp, pubnonce_ser) == 1); CHECK(secp256k1_memcmp_var(&tmp, &pubnonce[0], sizeof(tmp)) == 0); } /** Receive nonces and aggregate **/ CHECK(secp256k1_musig_nonce_agg(CTX, &aggnonce, pubnonce_ptr, 2) == 1); /* check that NULL in array of public nonce pointers is not allowed */ for (i = 0; i < 2; i++) { const secp256k1_musig_pubnonce *original_ptr = pubnonce_ptr[i]; pubnonce_ptr[i] = NULL; CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_agg(CTX, &aggnonce, pubnonce_ptr, 2)); pubnonce_ptr[i] = original_ptr; } CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_agg(CTX, NULL, pubnonce_ptr, 2)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_agg(CTX, &aggnonce, NULL, 2)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_agg(CTX, &aggnonce, pubnonce_ptr, 0)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_agg(CTX, &aggnonce, invalid_pubnonce_ptr, 1)); CHECK(secp256k1_musig_nonce_agg(CTX, &aggnonce, inf_pubnonce_ptr, 2) == 1); { /* Check that the aggnonce encodes two points at infinity */ secp256k1_ge aggnonce_pt[2]; secp256k1_musig_aggnonce_load(CTX, aggnonce_pt, &aggnonce); for (i = 0; i < 2; i++) { secp256k1_ge_is_infinity(&aggnonce_pt[i]); } } CHECK(secp256k1_musig_nonce_agg(CTX, &aggnonce, pubnonce_ptr, 2) == 1); /** Serialize and parse aggregate nonces **/ CHECK(secp256k1_musig_aggnonce_serialize(CTX, aggnonce_ser, &aggnonce) == 1); CHECK_ILLEGAL(CTX, secp256k1_musig_aggnonce_serialize(CTX, NULL, &aggnonce)); CHECK_ILLEGAL(CTX, secp256k1_musig_aggnonce_serialize(CTX, aggnonce_ser, NULL)); CHECK(memcmp_and_randomize(aggnonce_ser, zeros132, sizeof(aggnonce_ser)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_aggnonce_serialize(CTX, aggnonce_ser, (secp256k1_musig_aggnonce*) &invalid_pubnonce)); CHECK(memcmp_and_randomize(aggnonce_ser, zeros132, sizeof(aggnonce_ser)) == 0); CHECK(secp256k1_musig_aggnonce_serialize(CTX, aggnonce_ser, &aggnonce) == 1); CHECK(secp256k1_musig_aggnonce_parse(CTX, &aggnonce, aggnonce_ser) == 1); CHECK_ILLEGAL(CTX, secp256k1_musig_aggnonce_parse(CTX, NULL, aggnonce_ser)); CHECK_ILLEGAL(CTX, secp256k1_musig_aggnonce_parse(CTX, &aggnonce, NULL)); CHECK(secp256k1_musig_aggnonce_parse(CTX, &aggnonce, zeros132) == 1); CHECK(secp256k1_musig_aggnonce_parse(CTX, &aggnonce, aggnonce_ser) == 1); { /* Check that serialize and parse results in the same value */ secp256k1_musig_aggnonce tmp; CHECK(secp256k1_musig_aggnonce_serialize(CTX, aggnonce_ser, &aggnonce) == 1); CHECK(secp256k1_musig_aggnonce_parse(CTX, &tmp, aggnonce_ser) == 1); CHECK(secp256k1_memcmp_var(&tmp, &aggnonce, sizeof(tmp)) == 0); } /** Process nonces **/ CHECK(secp256k1_musig_nonce_process(CTX, &session, &aggnonce, msg, &keyagg_cache) == 1); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_process(CTX, NULL, &aggnonce, msg, &keyagg_cache)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_process(CTX, &session, NULL, msg, &keyagg_cache)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_process(CTX, &session, (secp256k1_musig_aggnonce*) &invalid_pubnonce, msg, &keyagg_cache)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_process(CTX, &session, &aggnonce, NULL, &keyagg_cache)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_process(CTX, &session, &aggnonce, msg, NULL)); CHECK_ILLEGAL(CTX, secp256k1_musig_nonce_process(CTX, &session, &aggnonce, msg, &invalid_keyagg_cache)); CHECK(secp256k1_musig_nonce_process(CTX, &session, &aggnonce, msg, &keyagg_cache) == 1); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); CHECK(secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce_tmp, &keypair[0], &keyagg_cache, &session) == 1); /* The secnonce is set to 0 and subsequent signing attempts fail */ CHECK(secp256k1_memcmp_var(&secnonce_tmp, zeros132, sizeof(secnonce_tmp)) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce_tmp, &keypair[0], &keyagg_cache, &session)); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, NULL, &secnonce_tmp, &keypair[0], &keyagg_cache, &session)); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], NULL, &keypair[0], &keyagg_cache, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], &invalid_secnonce, &keypair[0], &keyagg_cache, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce_tmp, NULL, &keyagg_cache, &session)); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce_tmp, &invalid_keypair, &keyagg_cache, &session)); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); { unsigned char sk_tmp[32]; secp256k1_keypair keypair_tmp; testrand256(sk_tmp); CHECK(secp256k1_keypair_create(CTX, &keypair_tmp, sk_tmp)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce_tmp, &keypair_tmp, &keyagg_cache, &session)); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); } CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce_tmp, &keypair[0], NULL, &session)); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce_tmp, &keypair[0], &invalid_keyagg_cache, &session)); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce_tmp, &keypair[0], &keyagg_cache, NULL)); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce_tmp, &keypair[0], &keyagg_cache, &invalid_session)); memcpy(&secnonce_tmp, &secnonce[0], sizeof(secnonce_tmp)); CHECK(secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce[0], &keypair[0], &keyagg_cache, &session) == 1); CHECK(secp256k1_musig_partial_sign(CTX, &partial_sig[1], &secnonce[1], &keypair[1], &keyagg_cache, &session) == 1); CHECK(secp256k1_musig_partial_sig_serialize(CTX, buf, &partial_sig[0]) == 1); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_serialize(CTX, NULL, &partial_sig[0])); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_serialize(CTX, buf, NULL)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_serialize(CTX, buf, &invalid_partial_sig)); CHECK(secp256k1_musig_partial_sig_parse(CTX, &partial_sig[0], buf) == 1); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_parse(CTX, NULL, buf)); { /* Check that parsing failure results in an invalid sig */ secp256k1_musig_partial_sig tmp; CHECK(secp256k1_musig_partial_sig_parse(CTX, &tmp, max64) == 0); CHECK(secp256k1_memcmp_var(&tmp, zeros132, sizeof(partial_sig[0])) == 0); } CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_parse(CTX, &partial_sig[0], NULL)); { /* Check that serialize and parse results in the same value */ secp256k1_musig_partial_sig tmp; CHECK(secp256k1_musig_partial_sig_serialize(CTX, buf, &partial_sig[0]) == 1); CHECK(secp256k1_musig_partial_sig_parse(CTX, &tmp, buf) == 1); CHECK(secp256k1_memcmp_var(&tmp, &partial_sig[0], sizeof(tmp)) == 0); } /** Partial signature verification */ CHECK(secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &pubnonce[0], &pk[0], &keyagg_cache, &session) == 1); CHECK(secp256k1_musig_partial_sig_verify(CTX, &partial_sig[1], &pubnonce[0], &pk[0], &keyagg_cache, &session) == 0); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, NULL, &pubnonce[0], &pk[0], &keyagg_cache, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, &invalid_partial_sig, &pubnonce[0], &pk[0], &keyagg_cache, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], NULL, &pk[0], &keyagg_cache, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &invalid_pubnonce, &pk[0], &keyagg_cache, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &pubnonce[0], NULL, &keyagg_cache, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &pubnonce[0], &invalid_pk, &keyagg_cache, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &pubnonce[0], &pk[0], NULL, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &pubnonce[0], &pk[0], &invalid_keyagg_cache, &session)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &pubnonce[0], &pk[0], &keyagg_cache, NULL)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &pubnonce[0], &pk[0], &keyagg_cache, &invalid_session)); CHECK(secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &pubnonce[0], &pk[0], &keyagg_cache, &session) == 1); CHECK(secp256k1_musig_partial_sig_verify(CTX, &partial_sig[1], &pubnonce[1], &pk[1], &keyagg_cache, &session) == 1); /** Signature aggregation and verification */ CHECK(secp256k1_musig_partial_sig_agg(CTX, pre_sig, &session, partial_sig_ptr, 2) == 1); /* check that NULL in array of partial signature pointers is not allowed */ for (i = 0; i < 2; i++) { const secp256k1_musig_partial_sig *original_ptr = partial_sig_ptr[i]; partial_sig_ptr[i] = NULL; CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_agg(CTX, pre_sig, &session, partial_sig_ptr, 2)); partial_sig_ptr[i] = original_ptr; } CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_agg(CTX, NULL, &session, partial_sig_ptr, 2)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_agg(CTX, pre_sig, NULL, partial_sig_ptr, 2)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_agg(CTX, pre_sig, &invalid_session, partial_sig_ptr, 2)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_agg(CTX, pre_sig, &session, NULL, 2)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_agg(CTX, pre_sig, &session, invalid_partial_sig_ptr, 2)); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sig_agg(CTX, pre_sig, &session, partial_sig_ptr, 0)); CHECK(secp256k1_musig_partial_sig_agg(CTX, pre_sig, &session, partial_sig_ptr, 1) == 1); CHECK(secp256k1_musig_partial_sig_agg(CTX, pre_sig, &session, partial_sig_ptr, 2) == 1); } static void musig_nonce_bitflip(unsigned char **args, size_t n_flip, size_t n_bytes) { secp256k1_scalar k1[2], k2[2]; secp256k1_nonce_function_musig(k1, args[0], args[1], args[2], args[3], args[4], args[5]); testrand_flip(args[n_flip], n_bytes); secp256k1_nonce_function_musig(k2, args[0], args[1], args[2], args[3], args[4], args[5]); CHECK(secp256k1_scalar_eq(&k1[0], &k2[0]) == 0); CHECK(secp256k1_scalar_eq(&k1[1], &k2[1]) == 0); } static void musig_nonce_test(void) { unsigned char *args[6]; unsigned char session_secrand[32]; unsigned char sk[32]; unsigned char pk[33]; unsigned char msg[32]; unsigned char agg_pk[32]; unsigned char extra_input[32]; int i, j; secp256k1_scalar k[6][2]; testrand_bytes_test(session_secrand, sizeof(session_secrand)); testrand_bytes_test(sk, sizeof(sk)); testrand_bytes_test(pk, sizeof(pk)); testrand_bytes_test(msg, sizeof(msg)); testrand_bytes_test(agg_pk, sizeof(agg_pk)); testrand_bytes_test(extra_input, sizeof(extra_input)); /* Check that a bitflip in an argument results in different nonces. */ args[0] = session_secrand; args[1] = msg; args[2] = sk; args[3] = pk; args[4] = agg_pk; args[5] = extra_input; for (i = 0; i < COUNT; i++) { musig_nonce_bitflip(args, 0, sizeof(session_secrand)); musig_nonce_bitflip(args, 1, sizeof(msg)); musig_nonce_bitflip(args, 2, sizeof(sk)); musig_nonce_bitflip(args, 3, sizeof(pk)); musig_nonce_bitflip(args, 4, sizeof(agg_pk)); musig_nonce_bitflip(args, 5, sizeof(extra_input)); } /* Check that if any argument is NULL, a different nonce is produced than if * any other argument is NULL. */ memcpy(msg, session_secrand, sizeof(msg)); memcpy(sk, session_secrand, sizeof(sk)); memcpy(pk, session_secrand, sizeof(session_secrand)); memcpy(agg_pk, session_secrand, sizeof(agg_pk)); memcpy(extra_input, session_secrand, sizeof(extra_input)); secp256k1_nonce_function_musig(k[0], args[0], args[1], args[2], args[3], args[4], args[5]); secp256k1_nonce_function_musig(k[1], args[0], NULL, args[2], args[3], args[4], args[5]); secp256k1_nonce_function_musig(k[2], args[0], args[1], NULL, args[3], args[4], args[5]); secp256k1_nonce_function_musig(k[3], args[0], args[1], args[2], NULL, args[4], args[5]); secp256k1_nonce_function_musig(k[4], args[0], args[1], args[2], args[3], NULL, args[5]); secp256k1_nonce_function_musig(k[5], args[0], args[1], args[2], args[3], args[4], NULL); for (i = 0; i < 6; i++) { CHECK(!secp256k1_scalar_eq(&k[i][0], &k[i][1])); for (j = i+1; j < 6; j++) { CHECK(!secp256k1_scalar_eq(&k[i][0], &k[j][0])); CHECK(!secp256k1_scalar_eq(&k[i][1], &k[j][1])); } } } /* Checks that the initialized tagged hashes have the expected * state. */ static void sha256_tag_test(void) { secp256k1_sha256 sha; { /* "KeyAgg list" */ static const unsigned char tag[] = {'K', 'e', 'y', 'A', 'g', 'g', ' ', 'l', 'i', 's', 't'}; secp256k1_musig_keyagglist_sha256(&sha); test_sha256_tag_midstate(&sha, tag, sizeof(tag)); } { /* "KeyAgg coefficient" */ static const unsigned char tag[] = {'K', 'e', 'y', 'A', 'g', 'g', ' ', 'c', 'o', 'e', 'f', 'f', 'i', 'c', 'i', 'e', 'n', 't'}; secp256k1_musig_keyaggcoef_sha256(&sha); test_sha256_tag_midstate(&sha, tag, sizeof(tag)); } { /* "MuSig/aux" */ static const unsigned char tag[] = { 'M', 'u', 'S', 'i', 'g', '/', 'a', 'u', 'x' }; secp256k1_nonce_function_musig_sha256_tagged_aux(&sha); test_sha256_tag_midstate(&sha, tag, sizeof(tag)); } { /* "MuSig/nonce" */ static const unsigned char tag[] = { 'M', 'u', 'S', 'i', 'g', '/', 'n', 'o', 'n', 'c', 'e' }; secp256k1_nonce_function_musig_sha256_tagged(&sha); test_sha256_tag_midstate(&sha, tag, sizeof(tag)); } { /* "MuSig/noncecoef" */ static const unsigned char tag[] = { 'M', 'u', 'S', 'i', 'g', '/', 'n', 'o', 'n', 'c', 'e', 'c', 'o', 'e', 'f' }; secp256k1_musig_compute_noncehash_sha256_tagged(&sha); test_sha256_tag_midstate(&sha, tag, sizeof(tag)); } } /* Attempts to create a signature for the aggregate public key using given secret * keys and keyagg_cache. */ static void musig_tweak_test_helper(const secp256k1_xonly_pubkey* agg_pk, const unsigned char *sk0, const unsigned char *sk1, secp256k1_musig_keyagg_cache *keyagg_cache) { secp256k1_pubkey pk[2]; unsigned char session_secrand[2][32]; unsigned char msg[32]; secp256k1_musig_secnonce secnonce[2]; secp256k1_musig_pubnonce pubnonce[2]; const secp256k1_musig_pubnonce *pubnonce_ptr[2]; secp256k1_musig_aggnonce aggnonce; secp256k1_keypair keypair[2]; secp256k1_musig_session session; secp256k1_musig_partial_sig partial_sig[2]; const secp256k1_musig_partial_sig *partial_sig_ptr[2]; unsigned char final_sig[64]; int i; for (i = 0; i < 2; i++) { pubnonce_ptr[i] = &pubnonce[i]; partial_sig_ptr[i] = &partial_sig[i]; testrand256(session_secrand[i]); } CHECK(create_keypair_and_pk(&keypair[0], &pk[0], sk0) == 1); CHECK(create_keypair_and_pk(&keypair[1], &pk[1], sk1) == 1); testrand256(msg); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[0], &pubnonce[0], session_secrand[0], sk0, &pk[0], NULL, NULL, NULL) == 1); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce[1], &pubnonce[1], session_secrand[1], sk1, &pk[1], NULL, NULL, NULL) == 1); CHECK(secp256k1_musig_nonce_agg(CTX, &aggnonce, pubnonce_ptr, 2) == 1); CHECK(secp256k1_musig_nonce_process(CTX, &session, &aggnonce, msg, keyagg_cache) == 1); CHECK(secp256k1_musig_partial_sign(CTX, &partial_sig[0], &secnonce[0], &keypair[0], keyagg_cache, &session) == 1); CHECK(secp256k1_musig_partial_sign(CTX, &partial_sig[1], &secnonce[1], &keypair[1], keyagg_cache, &session) == 1); CHECK(secp256k1_musig_partial_sig_verify(CTX, &partial_sig[0], &pubnonce[0], &pk[0], keyagg_cache, &session) == 1); CHECK(secp256k1_musig_partial_sig_verify(CTX, &partial_sig[1], &pubnonce[1], &pk[1], keyagg_cache, &session) == 1); CHECK(secp256k1_musig_partial_sig_agg(CTX, final_sig, &session, partial_sig_ptr, 2) == 1); CHECK(secp256k1_schnorrsig_verify(CTX, final_sig, msg, sizeof(msg), agg_pk) == 1); } /* Create aggregate public key P[0], tweak multiple times (using xonly and * plain tweaking) and test signing. */ static void musig_tweak_test_internal(void) { unsigned char sk[2][32]; secp256k1_pubkey pk[2]; const secp256k1_pubkey *pk_ptr[2]; secp256k1_musig_keyagg_cache keyagg_cache; enum { N_TWEAKS = 8 }; secp256k1_pubkey P[N_TWEAKS + 1]; secp256k1_xonly_pubkey P_xonly[N_TWEAKS + 1]; int i; /* Key Setup */ for (i = 0; i < 2; i++) { pk_ptr[i] = &pk[i]; testrand256(sk[i]); CHECK(create_keypair_and_pk(NULL, &pk[i], sk[i]) == 1); } /* Compute P0 = keyagg(pk0, pk1) and test signing for it */ CHECK(secp256k1_musig_pubkey_agg(CTX, &P_xonly[0], &keyagg_cache, pk_ptr, 2) == 1); musig_tweak_test_helper(&P_xonly[0], sk[0], sk[1], &keyagg_cache); CHECK(secp256k1_musig_pubkey_get(CTX, &P[0], &keyagg_cache)); /* Compute Pi = f(Pj) + tweaki*G where where j = i-1 and try signing for * that key. If xonly is set to true, the function f normalizes the input * point to have an even X-coordinate ("xonly-tweaking"). * Otherwise, the function f is the identity function. */ for (i = 1; i <= N_TWEAKS; i++) { unsigned char tweak[32]; int P_parity; int xonly = testrand_bits(1); testrand256(tweak); if (xonly) { CHECK(secp256k1_musig_pubkey_xonly_tweak_add(CTX, &P[i], &keyagg_cache, tweak) == 1); } else { CHECK(secp256k1_musig_pubkey_ec_tweak_add(CTX, &P[i], &keyagg_cache, tweak) == 1); } CHECK(secp256k1_xonly_pubkey_from_pubkey(CTX, &P_xonly[i], &P_parity, &P[i])); /* Check that musig_pubkey_tweak_add produces same result as * xonly_pubkey_tweak_add or ec_pubkey_tweak_add. */ if (xonly) { unsigned char P_serialized[32]; CHECK(secp256k1_xonly_pubkey_serialize(CTX, P_serialized, &P_xonly[i])); CHECK(secp256k1_xonly_pubkey_tweak_add_check(CTX, P_serialized, P_parity, &P_xonly[i-1], tweak) == 1); } else { secp256k1_pubkey tmp_key = P[i-1]; CHECK(secp256k1_ec_pubkey_tweak_add(CTX, &tmp_key, tweak)); CHECK(secp256k1_memcmp_var(&tmp_key, &P[i], sizeof(tmp_key)) == 0); } /* Test signing for P[i] */ musig_tweak_test_helper(&P_xonly[i], sk[0], sk[1], &keyagg_cache); } } int musig_vectors_keyagg_and_tweak(enum MUSIG_ERROR *error, secp256k1_musig_keyagg_cache *keyagg_cache, unsigned char *agg_pk_ser, const unsigned char pubkeys33[][33], const unsigned char tweaks32[][32], size_t key_indices_len, const size_t *key_indices, size_t tweak_indices_len, const size_t *tweak_indices, const int *is_xonly) { secp256k1_pubkey pubkeys[MUSIG_VECTORS_MAX_PUBKEYS]; const secp256k1_pubkey *pk_ptr[MUSIG_VECTORS_MAX_PUBKEYS]; int i; secp256k1_pubkey agg_pk; secp256k1_xonly_pubkey agg_pk_xonly; for (i = 0; i < (int)key_indices_len; i++) { if (!secp256k1_ec_pubkey_parse(CTX, &pubkeys[i], pubkeys33[key_indices[i]], 33)) { *error = MUSIG_PUBKEY; return 0; } pk_ptr[i] = &pubkeys[i]; } if (!secp256k1_musig_pubkey_agg(CTX, NULL, keyagg_cache, pk_ptr, key_indices_len)) { *error = MUSIG_OTHER; return 0; } for (i = 0; i < (int)tweak_indices_len; i++) { if (is_xonly[i]) { if (!secp256k1_musig_pubkey_xonly_tweak_add(CTX, NULL, keyagg_cache, tweaks32[tweak_indices[i]])) { *error = MUSIG_TWEAK; return 0; } } else { if (!secp256k1_musig_pubkey_ec_tweak_add(CTX, NULL, keyagg_cache, tweaks32[tweak_indices[i]])) { *error = MUSIG_TWEAK; return 0; } } } if (!secp256k1_musig_pubkey_get(CTX, &agg_pk, keyagg_cache)) { *error = MUSIG_OTHER; return 0; } if (!secp256k1_xonly_pubkey_from_pubkey(CTX, &agg_pk_xonly, NULL, &agg_pk)) { *error = MUSIG_OTHER; return 0; } if (agg_pk_ser != NULL) { if (!secp256k1_xonly_pubkey_serialize(CTX, agg_pk_ser, &agg_pk_xonly)) { *error = MUSIG_OTHER; return 0; } } return 1; } static void musig_test_vectors_keyagg(void) { size_t i; const struct musig_key_agg_vector *vector = &musig_key_agg_vector; for (i = 0; i < sizeof(vector->valid_case)/sizeof(vector->valid_case[0]); i++) { const struct musig_key_agg_valid_test_case *c = &vector->valid_case[i]; enum MUSIG_ERROR error; secp256k1_musig_keyagg_cache keyagg_cache; unsigned char agg_pk[32]; CHECK(musig_vectors_keyagg_and_tweak(&error, &keyagg_cache, agg_pk, vector->pubkeys, vector->tweaks, c->key_indices_len, c->key_indices, 0, NULL, NULL)); CHECK(secp256k1_memcmp_var(agg_pk, c->expected, sizeof(agg_pk)) == 0); } for (i = 0; i < sizeof(vector->error_case)/sizeof(vector->error_case[0]); i++) { const struct musig_key_agg_error_test_case *c = &vector->error_case[i]; enum MUSIG_ERROR error; secp256k1_musig_keyagg_cache keyagg_cache; CHECK(!musig_vectors_keyagg_and_tweak(&error, &keyagg_cache, NULL, vector->pubkeys, vector->tweaks, c->key_indices_len, c->key_indices, c->tweak_indices_len, c->tweak_indices, c->is_xonly)); CHECK(c->error == error); } } static void musig_test_vectors_noncegen(void) { size_t i; const struct musig_nonce_gen_vector *vector = &musig_nonce_gen_vector; for (i = 0; i < sizeof(vector->test_case)/sizeof(vector->test_case[0]); i++) { const struct musig_nonce_gen_test_case *c = &vector->test_case[i]; secp256k1_musig_keyagg_cache keyagg_cache; secp256k1_musig_keyagg_cache *keyagg_cache_ptr = NULL; unsigned char session_secrand32[32]; secp256k1_musig_secnonce secnonce; secp256k1_musig_pubnonce pubnonce; const unsigned char *sk = NULL; const unsigned char *msg = NULL; const unsigned char *extra_in = NULL; secp256k1_pubkey pk; unsigned char pubnonce66[66]; memcpy(session_secrand32, c->rand_, 32); if (c->has_sk) { sk = c->sk; } if (c->has_aggpk) { /* Create keyagg_cache from aggpk */ secp256k1_keyagg_cache_internal cache_i; secp256k1_xonly_pubkey aggpk; memset(&cache_i, 0, sizeof(cache_i)); CHECK(secp256k1_xonly_pubkey_parse(CTX, &aggpk, c->aggpk)); CHECK(secp256k1_xonly_pubkey_load(CTX, &cache_i.pk, &aggpk)); secp256k1_keyagg_cache_save(&keyagg_cache, &cache_i); keyagg_cache_ptr = &keyagg_cache; } if (c->has_msg) { msg = c->msg; } if (c->has_extra_in) { extra_in = c->extra_in; } CHECK(secp256k1_ec_pubkey_parse(CTX, &pk, c->pk, sizeof(c->pk))); CHECK(secp256k1_musig_nonce_gen(CTX, &secnonce, &pubnonce, session_secrand32, sk, &pk, msg, keyagg_cache_ptr, extra_in) == 1); CHECK(secp256k1_memcmp_var(&secnonce.data[4], c->expected_secnonce, 2*32) == 0); /* The last element of the secnonce is the public key (uncompressed in * secp256k1_musig_secnonce, compressed in the test vector secnonce). */ CHECK(secp256k1_memcmp_var(&secnonce.data[4+2*32], &pk, sizeof(pk)) == 0); CHECK(secp256k1_memcmp_var(&c->expected_secnonce[2*32], c->pk, sizeof(c->pk)) == 0); CHECK(secp256k1_musig_pubnonce_serialize(CTX, pubnonce66, &pubnonce) == 1); CHECK(sizeof(c->expected_pubnonce) == sizeof(pubnonce66)); CHECK(secp256k1_memcmp_var(pubnonce66, c->expected_pubnonce, sizeof(pubnonce66)) == 0); } } static void musig_test_vectors_nonceagg(void) { size_t i; int j; const struct musig_nonce_agg_vector *vector = &musig_nonce_agg_vector; for (i = 0; i < sizeof(vector->valid_case)/sizeof(vector->valid_case[0]); i++) { const struct musig_nonce_agg_test_case *c = &vector->valid_case[i]; secp256k1_musig_pubnonce pubnonce[2]; const secp256k1_musig_pubnonce *pubnonce_ptr[2]; secp256k1_musig_aggnonce aggnonce; unsigned char aggnonce66[66]; for (j = 0; j < 2; j++) { CHECK(secp256k1_musig_pubnonce_parse(CTX, &pubnonce[j], vector->pnonces[c->pnonce_indices[j]]) == 1); pubnonce_ptr[j] = &pubnonce[j]; } CHECK(secp256k1_musig_nonce_agg(CTX, &aggnonce, pubnonce_ptr, 2)); CHECK(secp256k1_musig_aggnonce_serialize(CTX, aggnonce66, &aggnonce)); CHECK(secp256k1_memcmp_var(aggnonce66, c->expected, 33) == 0); } for (i = 0; i < sizeof(vector->error_case)/sizeof(vector->error_case[0]); i++) { const struct musig_nonce_agg_test_case *c = &vector->error_case[i]; secp256k1_musig_pubnonce pubnonce[2]; for (j = 0; j < 2; j++) { int expected = c->invalid_nonce_idx != j; CHECK(expected == secp256k1_musig_pubnonce_parse(CTX, &pubnonce[j], vector->pnonces[c->pnonce_indices[j]])); } } } static void musig_test_set_secnonce(secp256k1_musig_secnonce *secnonce, const unsigned char *secnonce64, const secp256k1_pubkey *pubkey) { secp256k1_ge pk; secp256k1_scalar k[2]; secp256k1_scalar_set_b32(&k[0], &secnonce64[0], NULL); secp256k1_scalar_set_b32(&k[1], &secnonce64[32], NULL); CHECK(secp256k1_pubkey_load(CTX, &pk, pubkey)); secp256k1_musig_secnonce_save(secnonce, k, &pk); } static void musig_test_vectors_signverify(void) { size_t i; const struct musig_sign_verify_vector *vector = &musig_sign_verify_vector; for (i = 0; i < sizeof(vector->valid_case)/sizeof(vector->valid_case[0]); i++) { const struct musig_valid_case *c = &vector->valid_case[i]; enum MUSIG_ERROR error; secp256k1_musig_keyagg_cache keyagg_cache; secp256k1_pubkey pubkey; secp256k1_musig_pubnonce pubnonce; secp256k1_musig_aggnonce aggnonce; secp256k1_musig_session session; secp256k1_musig_partial_sig partial_sig; secp256k1_musig_secnonce secnonce; secp256k1_keypair keypair; unsigned char partial_sig32[32]; CHECK(secp256k1_keypair_create(CTX, &keypair, vector->sk)); CHECK(musig_vectors_keyagg_and_tweak(&error, &keyagg_cache, NULL, vector->pubkeys, NULL, c->key_indices_len, c->key_indices, 0, NULL, NULL)); CHECK(secp256k1_musig_aggnonce_parse(CTX, &aggnonce, vector->aggnonces[c->aggnonce_index])); CHECK(secp256k1_musig_nonce_process(CTX, &session, &aggnonce, vector->msgs[c->msg_index], &keyagg_cache)); CHECK(secp256k1_ec_pubkey_parse(CTX, &pubkey, vector->pubkeys[0], sizeof(vector->pubkeys[0]))); musig_test_set_secnonce(&secnonce, vector->secnonces[0], &pubkey); CHECK(secp256k1_musig_partial_sign(CTX, &partial_sig, &secnonce, &keypair, &keyagg_cache, &session)); CHECK(secp256k1_musig_partial_sig_serialize(CTX, partial_sig32, &partial_sig)); CHECK(secp256k1_memcmp_var(partial_sig32, c->expected, sizeof(partial_sig32)) == 0); CHECK(secp256k1_musig_pubnonce_parse(CTX, &pubnonce, vector->pubnonces[0])); CHECK(secp256k1_musig_partial_sig_verify(CTX, &partial_sig, &pubnonce, &pubkey, &keyagg_cache, &session)); } for (i = 0; i < sizeof(vector->sign_error_case)/sizeof(vector->sign_error_case[0]); i++) { const struct musig_sign_error_case *c = &vector->sign_error_case[i]; enum MUSIG_ERROR error; secp256k1_musig_keyagg_cache keyagg_cache; secp256k1_pubkey pubkey; secp256k1_musig_aggnonce aggnonce; secp256k1_musig_session session; secp256k1_musig_partial_sig partial_sig; secp256k1_musig_secnonce secnonce; secp256k1_keypair keypair; int expected; if (i == 0) { /* Skip this vector since the implementation does not error out when * the signing key does not belong to any pubkey. */ continue; } expected = c->error != MUSIG_PUBKEY; CHECK(expected == musig_vectors_keyagg_and_tweak(&error, &keyagg_cache, NULL, vector->pubkeys, NULL, c->key_indices_len, c->key_indices, 0, NULL, NULL)); CHECK(expected || c->error == error); if (!expected) { continue; } CHECK(secp256k1_ec_pubkey_parse(CTX, &pubkey, vector->pubkeys[0], sizeof(vector->pubkeys[0]))); CHECK(secp256k1_keypair_create(CTX, &keypair, vector->sk)); expected = c->error != MUSIG_AGGNONCE; CHECK(expected == secp256k1_musig_aggnonce_parse(CTX, &aggnonce, vector->aggnonces[c->aggnonce_index])); if (!expected) { continue; } CHECK(secp256k1_musig_nonce_process(CTX, &session, &aggnonce, vector->msgs[c->msg_index], &keyagg_cache)); expected = c->error != MUSIG_SECNONCE; CHECK(!expected); musig_test_set_secnonce(&secnonce, vector->secnonces[c->secnonce_index], &pubkey); CHECK_ILLEGAL(CTX, secp256k1_musig_partial_sign(CTX, &partial_sig, &secnonce, &keypair, &keyagg_cache, &session)); } for (i = 0; i < sizeof(vector->verify_fail_case)/sizeof(vector->verify_fail_case[0]); i++) { const struct musig_verify_fail_error_case *c = &vector->verify_fail_case[i]; enum MUSIG_ERROR error; secp256k1_musig_keyagg_cache keyagg_cache; secp256k1_musig_aggnonce aggnonce; secp256k1_musig_session session; secp256k1_musig_partial_sig partial_sig; enum { NUM_PUBNONCES = 3 }; secp256k1_musig_pubnonce pubnonce[NUM_PUBNONCES]; const secp256k1_musig_pubnonce *pubnonce_ptr[NUM_PUBNONCES]; secp256k1_pubkey pubkey; int expected; size_t j; CHECK(NUM_PUBNONCES <= c->nonce_indices_len); for (j = 0; j < c->nonce_indices_len; j++) { CHECK(secp256k1_musig_pubnonce_parse(CTX, &pubnonce[j], vector->pubnonces[c->nonce_indices[j]])); pubnonce_ptr[j] = &pubnonce[j]; } CHECK(musig_vectors_keyagg_and_tweak(&error, &keyagg_cache, NULL, vector->pubkeys, NULL, c->key_indices_len, c->key_indices, 0, NULL, NULL)); CHECK(secp256k1_musig_nonce_agg(CTX, &aggnonce, pubnonce_ptr, c->nonce_indices_len) == 1); CHECK(secp256k1_musig_nonce_process(CTX, &session, &aggnonce, vector->msgs[c->msg_index], &keyagg_cache)); CHECK(secp256k1_ec_pubkey_parse(CTX, &pubkey, vector->pubkeys[c->signer_index], sizeof(vector->pubkeys[0]))); expected = c->error != MUSIG_SIG; CHECK(expected == secp256k1_musig_partial_sig_parse(CTX, &partial_sig, c->sig)); if (!expected) { continue; } expected = c->error != MUSIG_SIG_VERIFY; CHECK(expected == secp256k1_musig_partial_sig_verify(CTX, &partial_sig, pubnonce, &pubkey, &keyagg_cache, &session)); } for (i = 0; i < sizeof(vector->verify_error_case)/sizeof(vector->verify_error_case[0]); i++) { const struct musig_verify_fail_error_case *c = &vector->verify_error_case[i]; enum MUSIG_ERROR error; secp256k1_musig_keyagg_cache keyagg_cache; secp256k1_musig_pubnonce pubnonce; int expected; expected = c->error != MUSIG_PUBKEY; CHECK(expected == musig_vectors_keyagg_and_tweak(&error, &keyagg_cache, NULL, vector->pubkeys, NULL, c->key_indices_len, c->key_indices, 0, NULL, NULL)); CHECK(expected || c->error == error); if (!expected) { continue; } expected = c->error != MUSIG_PUBNONCE; CHECK(expected == secp256k1_musig_pubnonce_parse(CTX, &pubnonce, vector->pubnonces[c->nonce_indices[c->signer_index]])); } } static void musig_test_vectors_tweak(void) { size_t i; const struct musig_tweak_vector *vector = &musig_tweak_vector; secp256k1_pubkey pubkey; secp256k1_musig_aggnonce aggnonce; secp256k1_musig_secnonce secnonce; CHECK(secp256k1_musig_aggnonce_parse(CTX, &aggnonce, vector->aggnonce)); CHECK(secp256k1_ec_pubkey_parse(CTX, &pubkey, vector->pubkeys[0], sizeof(vector->pubkeys[0]))); for (i = 0; i < sizeof(vector->valid_case)/sizeof(vector->valid_case[0]); i++) { const struct musig_tweak_case *c = &vector->valid_case[i]; enum MUSIG_ERROR error; secp256k1_musig_keyagg_cache keyagg_cache; secp256k1_musig_pubnonce pubnonce; secp256k1_musig_session session; secp256k1_musig_partial_sig partial_sig; secp256k1_keypair keypair; unsigned char partial_sig32[32]; musig_test_set_secnonce(&secnonce, vector->secnonce, &pubkey); CHECK(secp256k1_keypair_create(CTX, &keypair, vector->sk)); CHECK(musig_vectors_keyagg_and_tweak(&error, &keyagg_cache, NULL, vector->pubkeys, vector->tweaks, c->key_indices_len, c->key_indices, c->tweak_indices_len, c->tweak_indices, c->is_xonly)); CHECK(secp256k1_musig_nonce_process(CTX, &session, &aggnonce, vector->msg, &keyagg_cache)); CHECK(secp256k1_musig_partial_sign(CTX, &partial_sig, &secnonce, &keypair, &keyagg_cache, &session)); CHECK(secp256k1_musig_partial_sig_serialize(CTX, partial_sig32, &partial_sig)); CHECK(secp256k1_memcmp_var(partial_sig32, c->expected, sizeof(partial_sig32)) == 0); CHECK(secp256k1_musig_pubnonce_parse(CTX, &pubnonce, vector->pubnonces[c->nonce_indices[c->signer_index]])); CHECK(secp256k1_musig_partial_sig_verify(CTX, &partial_sig, &pubnonce, &pubkey, &keyagg_cache, &session)); } for (i = 0; i < sizeof(vector->error_case)/sizeof(vector->error_case[0]); i++) { const struct musig_tweak_case *c = &vector->error_case[i]; enum MUSIG_ERROR error; secp256k1_musig_keyagg_cache keyagg_cache; CHECK(!musig_vectors_keyagg_and_tweak(&error, &keyagg_cache, NULL, vector->pubkeys, vector->tweaks, c->key_indices_len, c->key_indices, c->tweak_indices_len, c->tweak_indices, c->is_xonly)); CHECK(error == MUSIG_TWEAK); } } static void musig_test_vectors_sigagg(void) { size_t i, j; const struct musig_sig_agg_vector *vector = &musig_sig_agg_vector; for (i = 0; i < sizeof(vector->valid_case)/sizeof(vector->valid_case[0]); i++) { const struct musig_sig_agg_case *c = &vector->valid_case[i]; enum MUSIG_ERROR error; unsigned char final_sig[64]; secp256k1_musig_keyagg_cache keyagg_cache; unsigned char agg_pk32[32]; secp256k1_xonly_pubkey agg_pk; secp256k1_musig_aggnonce aggnonce; secp256k1_musig_session session; secp256k1_musig_partial_sig partial_sig[(sizeof(vector->psigs)/sizeof(vector->psigs[0]))]; const secp256k1_musig_partial_sig *partial_sig_ptr[(sizeof(vector->psigs)/sizeof(vector->psigs[0]))]; CHECK(musig_vectors_keyagg_and_tweak(&error, &keyagg_cache, agg_pk32, vector->pubkeys, vector->tweaks, c->key_indices_len, c->key_indices, c->tweak_indices_len, c->tweak_indices, c->is_xonly)); CHECK(secp256k1_musig_aggnonce_parse(CTX, &aggnonce, c->aggnonce)); CHECK(secp256k1_musig_nonce_process(CTX, &session, &aggnonce, vector->msg, &keyagg_cache)); for (j = 0; j < c->psig_indices_len; j++) { CHECK(secp256k1_musig_partial_sig_parse(CTX, &partial_sig[j], vector->psigs[c->psig_indices[j]])); partial_sig_ptr[j] = &partial_sig[j]; } CHECK(secp256k1_musig_partial_sig_agg(CTX, final_sig, &session, partial_sig_ptr, c->psig_indices_len) == 1); CHECK(secp256k1_memcmp_var(final_sig, c->expected, sizeof(final_sig)) == 0); CHECK(secp256k1_xonly_pubkey_parse(CTX, &agg_pk, agg_pk32)); CHECK(secp256k1_schnorrsig_verify(CTX, final_sig, vector->msg, sizeof(vector->msg), &agg_pk) == 1); } for (i = 0; i < sizeof(vector->error_case)/sizeof(vector->error_case[0]); i++) { const struct musig_sig_agg_case *c = &vector->error_case[i]; secp256k1_musig_partial_sig partial_sig[(sizeof(vector->psigs)/sizeof(vector->psigs[0]))]; for (j = 0; j < c->psig_indices_len; j++) { int expected = c->invalid_sig_idx != (int)j; CHECK(expected == secp256k1_musig_partial_sig_parse(CTX, &partial_sig[j], vector->psigs[c->psig_indices[j]])); } } } /* Since the BIP doesn't provide static test vectors for nonce_gen_counter, we * define a static test here */ static void musig_test_static_nonce_gen_counter(void) { secp256k1_musig_secnonce secnonce; secp256k1_musig_pubnonce pubnonce; unsigned char pubnonce66[66]; secp256k1_pubkey pk; secp256k1_keypair keypair; uint64_t nonrepeating_cnt = 0; unsigned char sk[32] = { 0xEE, 0xC1, 0xCB, 0x7D, 0x1B, 0x72, 0x54, 0xC5, 0xCA, 0xB0, 0xD9, 0xC6, 0x1A, 0xB0, 0x2E, 0x64, 0x3D, 0x46, 0x4A, 0x59, 0xFE, 0x6C, 0x96, 0xA7, 0xEF, 0xE8, 0x71, 0xF0, 0x7C, 0x5A, 0xEF, 0x54, }; unsigned char expected_secnonce[64] = { 0x84, 0x2F, 0x13, 0x80, 0xCD, 0x17, 0xA1, 0x98, 0xFC, 0x3D, 0xAD, 0x3B, 0x7D, 0xA7, 0x49, 0x29, 0x41, 0xF4, 0x69, 0x76, 0xF2, 0x70, 0x2F, 0xF7, 0xC6, 0x6F, 0x24, 0xF4, 0x72, 0x03, 0x6A, 0xF1, 0xDA, 0x3F, 0x95, 0x2D, 0xDE, 0x4A, 0x2D, 0xA6, 0xB6, 0x32, 0x57, 0x07, 0xCE, 0x87, 0xA4, 0xE3, 0x61, 0x6D, 0x06, 0xFC, 0x5F, 0x81, 0xA9, 0xC9, 0x93, 0x86, 0xD2, 0x0A, 0x99, 0xCE, 0xCF, 0x99, }; unsigned char expected_pubnonce[66] = { 0x03, 0xA5, 0xB9, 0xB6, 0x90, 0x79, 0x42, 0xEA, 0xCD, 0xDA, 0x49, 0xA3, 0x66, 0x01, 0x6E, 0xC2, 0xE6, 0x24, 0x04, 0xA1, 0xBF, 0x4A, 0xB6, 0xD4, 0xDB, 0x82, 0x06, 0x7B, 0xC3, 0xAD, 0xF0, 0x86, 0xD7, 0x03, 0x32, 0x05, 0xDB, 0x9E, 0xB3, 0x4D, 0x5C, 0x7C, 0xE0, 0x28, 0x48, 0xCA, 0xC6, 0x8A, 0x83, 0xED, 0x73, 0xE3, 0x88, 0x34, 0x77, 0xF5, 0x63, 0xF2, 0x3C, 0xE9, 0xA1, 0x1A, 0x77, 0x21, 0xEC, 0x64, }; CHECK(secp256k1_keypair_create(CTX, &keypair, sk)); CHECK(secp256k1_keypair_pub(CTX, &pk, &keypair)); CHECK(secp256k1_musig_nonce_gen_counter(CTX, &secnonce, &pubnonce, nonrepeating_cnt, &keypair, NULL, NULL, NULL) == 1); CHECK(secp256k1_memcmp_var(&secnonce.data[4], expected_secnonce, 2*32) == 0); CHECK(secp256k1_memcmp_var(&secnonce.data[4+2*32], &pk, sizeof(pk)) == 0); CHECK(secp256k1_musig_pubnonce_serialize(CTX, pubnonce66, &pubnonce) == 1); CHECK(secp256k1_memcmp_var(pubnonce66, expected_pubnonce, sizeof(pubnonce66)) == 0); } /* --- Test registry --- */ REPEAT_TEST(musig_simple_test) /* Run multiple times to ensure that pk and nonce have different y parities */ REPEAT_TEST(musig_tweak_test) static const struct tf_test_entry tests_musig[] = { CASE1(musig_simple_test), CASE1(musig_api_tests), CASE1(musig_nonce_test), CASE1(musig_tweak_test), CASE1(sha256_tag_test), CASE1(musig_test_vectors_keyagg), CASE1(musig_test_vectors_noncegen), CASE1(musig_test_vectors_nonceagg), CASE1(musig_test_vectors_signverify), CASE1(musig_test_vectors_tweak), CASE1(musig_test_vectors_sigagg), CASE1(musig_test_static_nonce_gen_counter), }; #endif