rsa/rsa_ossl.c: make RSAerr call in rsa_ossl_private_decrypt unconditional.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 89072e0c2a483f2ad678e723e112712567b0ceb1)

(Merged from https://github.com/openssl/openssl/pull/7735)

diff --git a/crypto/rsa/rsa_ossl.c b/crypto/rsa/rsa_ossl.c
index a485c7ef47f7a1fa2dd92022eaade1c6ee2e7a2b..ed77fadcba58617aaa853f61fb2b13cef6a8053f 100644 (file)
--- a/crypto/rsa/rsa_ossl.c
+++ b/crypto/rsa/rsa_ossl.c
@@ -10,6 +10,7 @@
 #include "internal/cryptlib.h"
 #include "internal/bn_int.h"
 #include "rsa_locl.h"
+#include "internal/constant_time_locl.h"
 
 static int rsa_ossl_public_encrypt(int flen, const unsigned char *from,
                                   unsigned char *to, RSA *rsa, int padding);
@@ -470,8 +471,8 @@ static int rsa_ossl_private_decrypt(int flen, const unsigned char *from,
         RSAerr(RSA_F_RSA_OSSL_PRIVATE_DECRYPT, RSA_R_UNKNOWN_PADDING_TYPE);
         goto err;
     }
-    if (r < 0)
-        RSAerr(RSA_F_RSA_OSSL_PRIVATE_DECRYPT, RSA_R_PADDING_CHECK_FAILED);
+    RSAerr(RSA_F_RSA_OSSL_PRIVATE_DECRYPT, RSA_R_PADDING_CHECK_FAILED);
+    err_clear_last_constant_time(r >= 0);
 
  err:
     if (ctx != NULL)