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From 349a41da1ad88ad87825414752a8ff5fdd6a6c3f Mon Sep 17 00:00:00 2001
From: Billy Brumley <bbrumley@gmail.com>
Date: Wed, 11 Apr 2018 10:10:58 +0300
Subject: [PATCH] RSA key generation: ensure BN_mod_inverse and BN_mod_exp_mont
both get called with BN_FLG_CONSTTIME flag set.
CVE-2018-0737
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 6939eab03a6e23d2bd2c3f5e34fe1d48e542e787)
---
crypto/rsa/rsa_gen.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/crypto/rsa/rsa_gen.c b/crypto/rsa/rsa_gen.c
index 9ca5dfefb70..42b89a8dfaa 100644
--- a/crypto/rsa/rsa_gen.c
+++ b/crypto/rsa/rsa_gen.c
@@ -156,6 +156,8 @@ static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value,
if (BN_copy(rsa->e, e_value) == NULL)
goto err;
+ BN_set_flags(rsa->p, BN_FLG_CONSTTIME);
+ BN_set_flags(rsa->q, BN_FLG_CONSTTIME);
BN_set_flags(r2, BN_FLG_CONSTTIME);
/* generate p and q */
for (;;) {
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