3 files changed, 32 insertions, 12 deletions
diff --git a/src/math/bigint/big_code.cpp b/src/math/bigint/big_code.cpp
index 75a310a7c..28614c9f1 100644
--- a/src/math/bigint/big_code.cpp
+++ b/src/math/bigint/big_code.cpp
@@ -111,7 +111,9 @@ BigInt BigInt::decode(const byte buf[], size_t length, Base base)
       if(length % 2)
          {
          // Handle lack of leading 0
-         const char buf0_with_leading_0[2] = { '0', buf[0] };
+         const char buf0_with_leading_0[2] =
+            { '0', static_cast<char>(buf[0]) };
+
          binary = hex_decode(buf0_with_leading_0, 2);
 
          binary += hex_decode(reinterpret_cast<const char*>(&buf[1]),
diff --git a/src/math/bigint/bigint.cpp b/src/math/bigint/bigint.cpp
index e2e062f2d..e2bbe7f5a 100644
--- a/src/math/bigint/bigint.cpp
+++ b/src/math/bigint/bigint.cpp
@@ -40,7 +40,7 @@ BigInt::BigInt(Sign s, size_t size)
    }
 
 /*
-* Construct a BigInt from a "raw" BigInt
+* Copy constructor
 */
 BigInt::BigInt(const BigInt& b)
    {
@@ -101,15 +101,6 @@ BigInt::BigInt(RandomNumberGenerator& rng, size_t bits)
    }
 
 /*
-* Swap this BigInt with another
-*/
-void BigInt::swap(BigInt& other)
-   {
-   reg.swap(other.reg);
-   std::swap(signedness, other.signedness);
-   }
-
-/*
 * Grow the internal storage
 */
 void BigInt::grow_reg(size_t n)
diff --git a/src/math/bigint/bigint.h b/src/math/bigint/bigint.h
index 87c7cb766..57aa84528 100644
--- a/src/math/bigint/bigint.h
+++ b/src/math/bigint/bigint.h
@@ -438,7 +438,11 @@ class BOTAN_DLL BigInt
      * Swap this value with another
      * @param other BigInt to swap values with
      */
-     void swap(BigInt& other);
+     void swap(BigInt& other)
+        {
+        reg.swap(other.reg);
+        std::swap(signedness, other.signedness);
+        }
 
      /**
      * Create empty BigInt
@@ -500,6 +504,29 @@ class BOTAN_DLL BigInt
      */
      BigInt(NumberType type, size_t n);
 
+     /**
+     * Move constructor
+     */
+     BigInt(BigInt&& other)
+        {
+        this->swap(other);
+        }
+
+     /**
+     * Move assignment
+     */
+     BigInt& operator=(BigInt&& other)
+        {
+        if(this != &other)
+           this->swap(other);
+
+        return (*this);
+        }
+
+     /**
+     * Copy assignment
+     */
+     BigInt& operator=(const BigInt&) = default;
    private:
       SecureVector<word> reg;
       Sign signedness;