1 files changed, 18 insertions, 0 deletions
diff --git a/src/math/mp/mp_asm.cpp b/src/math/mp/mp_asm.cpp
index 7f98b47cb..a3caba620 100644
--- a/src/math/mp/mp_asm.cpp
+++ b/src/math/mp/mp_asm.cpp
@@ -7,6 +7,10 @@
 */
 
 #include <botan/internal/mp_core.h>
+#include <botan/internal/mp_asmi.h>
+#include <botan/internal/mp_core.h>
+#include <botan/exceptn.h>
+#include <botan/mem_ops.h>
 
 namespace Botan {
 
@@ -17,6 +21,20 @@ extern "C" {
 */
 word bigint_add2_nc(word x[], size_t x_size, const word y[], size_t y_size)
    {
+   word carry = 0;
+
+   const size_t blocks = y_size - (y_size % 8);
+
+   for(size_t i = 0; i != blocks; i += 8)
+      carry = word8_add2(x + i, y + i, carry);
+
+   for(size_t i = blocks; i != y_size; ++i)
+      x[i] = word_add(x[i], y[i], &carry);
+
+   for(size_t i = y_size; i != x_size; ++i)
+      x[i] = word_add(x[i], 0, &carry);
+
+   return carry;
    }
 
 /*