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Change to mitigate branch prediction attacks

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Submitted by: Matthew D Wood
Reviewed by: Bodo Moeller
This commit is contained in:
Bodo Möller
2007-03-28 00:15:28 +00:00
parent b506821d43
commit bd31fb2145
16 changed files with 595 additions and 42 deletions
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14
crypto/rsa/rsa_lib.c
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@@ -361,7 +361,8 @@ err:
BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
{
BIGNUM *e;
BIGNUM local_n;
BIGNUM *e,*n;
BN_CTX *ctx;
BN_BLINDING *ret = NULL;
@@ -400,7 +401,16 @@ BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
}
ret = BN_BLINDING_create_param(NULL, e, rsa->n, ctx,
if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
{
/* Set BN_FLG_CONSTTIME flag */
n = &local_n;
BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
}
else
n = rsa->n;
ret = BN_BLINDING_create_param(NULL, e, n, ctx,
rsa->meth->bn_mod_exp, rsa->_method_mod_n);
if (ret == NULL)
{