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Fixed UB(arithmetics on uninit values) in cmovs

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Elichai Turkel
2020-05-20 15:09:13 +03:00
parent 3a6fd7f636
commit a39c2b09de
5 changed files with 12 additions and 7 deletions
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src/scalar.h
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@@ -111,7 +111,7 @@ static void secp256k1_scalar_split_lambda(secp256k1_scalar *r1, secp256k1_scalar
/** Multiply a and b (without taking the modulus!), divide by 2**shift, and round to the nearest integer. Shift must be at least 256. */
static void secp256k1_scalar_mul_shift_var(secp256k1_scalar *r, const secp256k1_scalar *a, const secp256k1_scalar *b, unsigned int shift);
/** If flag is true, set *r equal to *a; otherwise leave it. Constant-time. */
/** If flag is true, set *r equal to *a; otherwise leave it. Constant-time. Both *r and *a must be initialized.*/
static void secp256k1_scalar_cmov(secp256k1_scalar *r, const secp256k1_scalar *a, int flag);
#endif /* SECP256K1_SCALAR_H */