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authorlloyd <[email protected]>2010-08-13 15:13:21 +0000
committerlloyd <[email protected]>2010-08-13 15:13:21 +0000
commit3da3b04e1ba1577b3d0e1b4b9b3f4b24381fc433 (patch)
tree8a4b3a3b8e830ffcbd41f41859db4ab4fd972fb2 /src/pubkey/dsa/dsa.cpp
parent2cae6ec17984ad016f973d5925860278e575b3f4 (diff)
parent789cee0888bbede838a2a3cf6221677c9f172872 (diff)
propagate from branch 'net.randombit.botan' (head 0a3348f52bf558bc2282e1066c2913a72a1aeda5)
to branch 'net.randombit.botan.c++0x' (head 552c20ae8874f12da779fc25ea368e36e71cbfe8)
Diffstat (limited to 'src/pubkey/dsa/dsa.cpp')
-rw-r--r--src/pubkey/dsa/dsa.cpp20
1 files changed, 15 insertions, 5 deletions
diff --git a/src/pubkey/dsa/dsa.cpp b/src/pubkey/dsa/dsa.cpp
index 7eefa5923..7a84bf313 100644
--- a/src/pubkey/dsa/dsa.cpp
+++ b/src/pubkey/dsa/dsa.cpp
@@ -8,7 +8,7 @@
#include <botan/dsa.h>
#include <botan/numthry.h>
#include <botan/keypair.h>
-
+#include <future>
namespace Botan {
/*
@@ -89,8 +89,12 @@ DSA_Signature_Operation::sign(const byte msg[], u32bit msg_len,
k.randomize(rng, q.bits());
while(k >= q);
- r = mod_q.reduce(powermod_g_p(k));
- s = mod_q.multiply(inverse_mod(k, q), mul_add(x, r, i));
+ auto future_r = std::async(std::launch::async,
+ [&]() { return mod_q.reduce(powermod_g_p(k)); });
+
+ s = inverse_mod(k, q);
+ r = future_r.get();
+ s = mod_q.multiply(s, mul_add(x, r, i));
}
SecureVector<byte> output(2*q.bytes());
@@ -124,8 +128,14 @@ bool DSA_Verification_Operation::verify(const byte msg[], u32bit msg_len,
return false;
s = inverse_mod(s, q);
- s = mod_p.multiply(powermod_g_p(mod_q.multiply(s, i)),
- powermod_y_p(mod_q.multiply(s, r)));
+
+ auto future_s_i = std::async(std::launch::async,
+ [&]() { return powermod_g_p(mod_q.multiply(s, i)); });
+
+ BigInt s_r = powermod_y_p(mod_q.multiply(s, r));
+ BigInt s_i = future_s_i.get();
+
+ s = mod_p.multiply(s_i, s_r);
return (mod_q.reduce(s) == r);
}