Commit 61ac9fc5 authored by David Benjamin's avatar David Benjamin
Browse files

Remove zero special-case in BN_mod_exp_mont. 



A number intended to treat the base as secret should not be branching on
whether it is zero. Test-wise, this is covered by existing tests in bnmod.txt.

Reviewed-by: default avatarRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6733)
parent 8937a4ed

crypto/bn/bn_exp.c

+0 −5
Original line number Diff line number Diff line
@@ -356,11 +356,6 @@ int BN_mod_exp_mont(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p, 
        aa = val[0];

    } else

        aa = a;

    if (BN_is_zero(aa)) {

        BN_zero(rr);

        ret = 1;

        goto err;

    }

    if (!bn_to_mont_fixed_top(val[0], aa, mont, ctx))

        goto err;               /* 1 */