frost/secp256k1-zkp
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No need to subtract 1 before doing a right shift

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roconnor-blockstream 2023-03-27 09:29:41 -04:00 committed by GitHub
parent 464a9115b4
commit 3e43041be6
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1 changed files with 1 additions and 1 deletions
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src/int128_struct_impl.h
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@ -193,7 +193,7 @@ static SECP256K1_INLINE int secp256k1_i128_check_pow2(const secp256k1_int128 *r,
VERIFY_CHECK(n < 127);
VERIFY_CHECK(sign == 1 || sign == -1);
return n >= 64 ? r->hi == (uint64_t)sign << (n - 64) && r->lo == 0
: r->hi == (uint64_t)((sign - 1) >> 1) && r->lo == (uint64_t)sign << n;
: r->hi == (uint64_t)(sign >> 1) && r->lo == (uint64_t)sign << n;
}
#endif