Fix various MSVC warnings

Based on VC2017 output

2 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/math/numbertheory/powm_fw.cpp b/src/lib/math/numbertheory/powm_fw.cpp
index 770f345c6..ea3f5ecf0 100644
--- a/src/lib/math/numbertheory/powm_fw.cpp
+++ b/src/lib/math/numbertheory/powm_fw.cpp
@@ -26,7 +26,7 @@ void Fixed_Window_Exponentiator::set_base(const BigInt& base)
    {
    m_window_bits = Power_Mod::window_bits(m_exp.bits(), base.bits(), m_hints);
 
-   m_g.resize((1 << m_window_bits));
+   m_g.resize((1U << m_window_bits));
    m_g[0] = 1;
    m_g[1] = base;
 
diff --git a/src/lib/math/numbertheory/powm_mnt.cpp b/src/lib/math/numbertheory/powm_mnt.cpp
index e45816950..7e5c0be55 100644
--- a/src/lib/math/numbertheory/powm_mnt.cpp
+++ b/src/lib/math/numbertheory/powm_mnt.cpp
@@ -28,7 +28,7 @@ void Montgomery_Exponentiator::set_base(const BigInt& base)
    {
    m_window_bits = Power_Mod::window_bits(m_exp.bits(), base.bits(), m_hints);
 
-   m_g.resize((1 << m_window_bits));
+   m_g.resize((1U << m_window_bits));
 
    BigInt z(BigInt::Positive, 2 * (m_mod_words + 1));
    secure_vector<word> workspace(z.size());