1 files changed, 46 insertions, 0 deletions
diff --git a/src/libs/3rdparty/botan/src/lib/math/numbertheory/powm_mnt.cpp b/src/libs/3rdparty/botan/src/lib/math/numbertheory/powm_mnt.cpp
new file mode 100644
index 0000000000..8cb3f6a08e
--- /dev/null
+++ b/src/libs/3rdparty/botan/src/lib/math/numbertheory/powm_mnt.cpp
@@ -0,0 +1,46 @@
+/*
+* Montgomery Exponentiation
+* (C) 1999-2010,2012,2018 Jack Lloyd
+*     2016 Matthias Gierlings
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/internal/def_powm.h>
+#include <botan/numthry.h>
+#include <botan/monty.h>
+#include <botan/internal/monty_exp.h>
+#include <botan/internal/rounding.h>
+
+namespace Botan {
+
+void Montgomery_Exponentiator::set_exponent(const BigInt& exp)
+   {
+   m_e = exp;
+   }
+
+void Montgomery_Exponentiator::set_base(const BigInt& base)
+   {
+   size_t window_bits = Power_Mod::window_bits(m_e.bits(), base.bits(), m_hints);
+   m_monty = monty_precompute(m_monty_params, base, window_bits);
+   }
+
+BigInt Montgomery_Exponentiator::execute() const
+   {
+   /*
+   This leaks size of e via loop iterations, not possible to fix without
+   breaking this API. Round up to avoid leaking fine details.
+   */
+   return monty_execute(*m_monty, m_e, round_up(m_e.bits(), 8));
+   }
+
+Montgomery_Exponentiator::Montgomery_Exponentiator(const BigInt& mod,
+                                                   Power_Mod::Usage_Hints hints) :
+   m_p(mod),
+   m_mod_p(mod),
+   m_monty_params(std::make_shared<Montgomery_Params>(m_p, m_mod_p)),
+   m_hints(hints)
+   {
+   }
+
+}