1 files changed, 3 insertions, 1 deletions
diff --git a/src/pubkey/rsa/rsa.cpp b/src/pubkey/rsa/rsa.cpp
index 200e92821..e27b2056d 100644
--- a/src/pubkey/rsa/rsa.cpp
+++ b/src/pubkey/rsa/rsa.cpp
@@ -9,6 +9,7 @@
 #include <botan/parsing.h>
 #include <botan/numthry.h>
 #include <botan/keypair.h>
+#include <future>
 
 namespace Botan {
 
@@ -89,8 +90,9 @@ BigInt RSA_Private_Operation::private_op(const BigInt& m) const
    if(m >= n)
       throw Invalid_Argument("RSA private op - input is too large");
 
-   BigInt j1 = powermod_d1_p(m);
+   auto future_j1 = std::async(std::launch::async, powermod_d1_p, m);
    BigInt j2 = powermod_d2_q(m);
+   BigInt j1 = future_j1.get();
 
    j1 = mod_p.reduce(sub_mul(j1, j2, c));