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Return temporaries to being unsigned in secp256k1_fe_sqr_inner

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These temporaries seem to been inadvertently changed to signed during a refactoring.  Generally, bit shifting is frowned upon for signed values.
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roconnor-blockstream 2023-11-14 09:29:21 -05:00 committed by GitHub
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src/field_5x52_int128_impl.h
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@ -159,7 +159,7 @@ SECP256K1_INLINE static void secp256k1_fe_mul_inner(uint64_t *r, const uint64_t
SECP256K1_INLINE static void secp256k1_fe_sqr_inner(uint64_t *r, const uint64_t *a) { SECP256K1_INLINE static void secp256k1_fe_sqr_inner(uint64_t *r, const uint64_t *a) {
secp256k1_uint128 c, d; secp256k1_uint128 c, d;
uint64_t a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3], a4 = a[4]; uint64_t a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3], a4 = a[4];
int64_t t3, t4, tx, u0; uint64_t t3, t4, tx, u0;
const uint64_t M = 0xFFFFFFFFFFFFFULL, R = 0x1000003D10ULL; const uint64_t M = 0xFFFFFFFFFFFFFULL, R = 0x1000003D10ULL;
VERIFY_BITS(a[0], 56); VERIFY_BITS(a[0], 56);