diff options
Diffstat (limited to 'src/lib/pubkey/dsa/dsa.cpp')
| -rw-r--r-- | src/lib/pubkey/dsa/dsa.cpp | 15 |
1 files changed, 14 insertions, 1 deletions
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); |