From ed9e147695e4c5e800e83654baf365a634f3a2a7 Mon Sep 17 00:00:00 2001
From: Jack Lloyd <lloyd@randombit.net>
Date: Wed, 12 Oct 2016 15:32:14 -0400
Subject: Abstract out mutex type. Make threads optional.

---
 src/lib/pubkey/dsa/dsa.cpp | 15 ++++++++++++++-
 src/lib/pubkey/rsa/rsa.cpp | 11 ++++++++++-
 2 files changed, 24 insertions(+), 2 deletions(-)

(limited to 'src/lib/pubkey')

diff --git a/src/lib/pubkey/dsa/dsa.cpp b/src/lib/pubkey/dsa/dsa.cpp
index 15dc45373..9c8ae0821 100644
--- a/src/lib/pubkey/dsa/dsa.cpp
+++ b/src/lib/pubkey/dsa/dsa.cpp
@@ -17,7 +17,9 @@
   #include <botan/rfc6979.h>
 #endif
 
-#include <future>
+#if defined(BOTAN_TARGET_OS_HAS_THREADS)
+  #include <future>
+#endif
 
 namespace Botan {
 
@@ -124,11 +126,17 @@ DSA_Signature_Operation::raw_sign(const byte msg[], size_t msg_len,
    const BigInt k = BigInt::random_integer(rng, 1, m_q);
 #endif
 
+#if defined(BOTAN_TARGET_OS_HAS_THREADS)
    auto future_r = std::async(std::launch::async,
                               [&]() { return m_mod_q.reduce(m_powermod_g_p(k)); });
 
    BigInt s = inverse_mod(k, m_q);
    const BigInt r = future_r.get();
+#else
+   BigInt s = inverse_mod(k, m_q);
+   const BigInt r = m_mod_q.reduce(m_powermod_g_p(k));
+#endif
+
    s = m_mod_q.multiply(s, mul_add(m_x, r, i));
 
    // With overwhelming probability, a bug rather than actual zero r/s
@@ -184,11 +192,16 @@ bool DSA_Verification_Operation::verify(const byte msg[], size_t msg_len,
 
    s = inverse_mod(s, m_q);
 
+#if defined(BOTAN_TARGET_OS_HAS_THREADS)
    auto future_s_i = std::async(std::launch::async,
       [&]() { return m_powermod_g_p(m_mod_q.multiply(s, i)); });
 
    BigInt s_r = m_powermod_y_p(m_mod_q.multiply(s, r));
    BigInt s_i = future_s_i.get();
+#else
+   BigInt s_r = m_powermod_y_p(m_mod_q.multiply(s, r));
+   BigInt s_i = m_powermod_g_p(m_mod_q.multiply(s, i));
+#endif
 
    s = m_mod_p.multiply(s_i, s_r);
 
diff --git a/src/lib/pubkey/rsa/rsa.cpp b/src/lib/pubkey/rsa/rsa.cpp
index b40f485e3..d201ca277 100644
--- a/src/lib/pubkey/rsa/rsa.cpp
+++ b/src/lib/pubkey/rsa/rsa.cpp
@@ -14,12 +14,16 @@
 #include <botan/workfactor.h>
 #include <botan/der_enc.h>
 #include <botan/ber_dec.h>
-#include <future>
 
 #if defined(BOTAN_HAS_OPENSSL)
   #include <botan/internal/openssl.h>
 #endif
 
+#if defined(BOTAN_TARGET_OS_HAS_THREADS)
+#include <future>
+#endif
+
+
 namespace Botan {
 
 size_t RSA_PublicKey::estimated_strength() const
@@ -218,9 +222,14 @@ class RSA_Private_Operation
 
       BigInt private_op(const BigInt& m) const
          {
+#if defined(BOTAN_TARGET_OS_HAS_THREADS)
          auto future_j1 = std::async(std::launch::async, m_powermod_d1_p, m);
          BigInt j2 = m_powermod_d2_q(m);
          BigInt j1 = future_j1.get();
+#else
+         BigInt j1 = m_powermod_d1_p(m);
+         BigInt j2 = m_powermod_d2_q(m);
+#endif
 
          j1 = m_mod_p.reduce(sub_mul(j1, j2, m_c));
 
-- 
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