diff options
Diffstat (limited to 'crypto/bn/rsaz_exp.h')
| -rw-r--r-- | crypto/bn/rsaz_exp.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/crypto/bn/rsaz_exp.h b/crypto/bn/rsaz_exp.h index b4fd3cbbba..45dc9cc197 100644 --- a/crypto/bn/rsaz_exp.h +++ b/crypto/bn/rsaz_exp.h @@ -22,6 +22,8 @@ # define RSAZ_ENABLED # include <openssl/bn.h> +# include "internal/constant_time.h" +# include "bn_local.h" void RSAZ_1024_mod_exp_avx2(BN_ULONG result[16], const BN_ULONG base_norm[16], @@ -52,6 +54,27 @@ int ossl_rsaz_mod_exp_avx512_x2(BN_ULONG *res1, BN_ULONG k0_2, int factor_size); +static ossl_inline void bn_select_words(BN_ULONG *r, BN_ULONG mask, + const BN_ULONG *a, + const BN_ULONG *b, size_t num) +{ + size_t i; + + for (i = 0; i < num; i++) { + r[i] = constant_time_select_64(mask, a[i], b[i]); + } +} + +static ossl_inline BN_ULONG bn_reduce_once_in_place(BN_ULONG *r, + BN_ULONG carry, + const BN_ULONG *m, + BN_ULONG *tmp, size_t num) +{ + carry -= bn_sub_words(tmp, r, m, num); + bn_select_words(r, carry, r /* tmp < 0 */, tmp /* tmp >= 0 */, num); + return carry; +} + # endif #endif |