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musig: VERIFY_CHECK preconditions of _musig_keyaggcoef_internal()

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This commit is contained in:
Tim Ruffing 2023-04-21 16:18:19 +02:00
parent da7702844e
commit a0b51afc01
1 changed files with 6 additions and 0 deletions
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6
src/modules/musig/keyagg_impl.h
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@ -166,6 +166,12 @@ static void secp256k1_musig_keyaggcoef_sha256(secp256k1_sha256 *sha) {
static void secp256k1_musig_keyaggcoef_internal(secp256k1_scalar *r, const unsigned char *pk_hash, secp256k1_ge *pk, const secp256k1_ge *second_pk) {
secp256k1_sha256 sha;
VERIFY_CHECK(!secp256k1_ge_is_infinity(pk));
#ifdef VERIFY
VERIFY_CHECK(pk->x.normalized && pk->y.normalized);
VERIFY_CHECK(secp256k1_ge_is_infinity(second_pk) || (second_pk->x.normalized && second_pk->y.normalized));
#endif
if (!secp256k1_ge_is_infinity(second_pk)
&& secp256k1_fe_equal(&pk->x, &second_pk->x)
&& secp256k1_fe_is_odd(&pk->y) == secp256k1_fe_is_odd(&second_pk->y)) {