1 files changed, 52 insertions, 0 deletions
diff --git a/src/bigint/mp_asm.h b/src/bigint/mp_asm.h
new file mode 100644
index 000000000..e62a57110
--- /dev/null
+++ b/src/bigint/mp_asm.h
@@ -0,0 +1,52 @@
+/*************************************************
+* Lowest Level MPI Algorithms Header File        *
+* (C) 1999-2008 Jack Lloyd                       *
+*     2006 Luca Piccarreta                       *
+*************************************************/
+
+#ifndef BOTAN_MP_ASM_H__
+#define BOTAN_MP_ASM_H__
+
+#include <botan/mp_types.h>
+
+#if (BOTAN_MP_WORD_BITS == 8)
+  typedef Botan::u16bit dword;
+#elif (BOTAN_MP_WORD_BITS == 16)
+  typedef Botan::u32bit dword;
+#elif (BOTAN_MP_WORD_BITS == 32)
+  typedef Botan::u64bit dword;
+#elif (BOTAN_MP_WORD_BITS == 64)
+  #error BOTAN_MP_WORD_BITS can be 64 only with assembly support
+#else
+  #error BOTAN_MP_WORD_BITS must be 8, 16, 32, or 64
+#endif
+
+namespace Botan {
+
+extern "C" {
+
+/*************************************************
+* Word Multiply/Add                              *
+*************************************************/
+inline word word_madd2(word a, word b, word* c)
+   {
+   dword z = (dword)a * b + *c;
+   *c = (word)(z >> BOTAN_MP_WORD_BITS);
+   return (word)z;
+   }
+
+/*************************************************
+* Word Multiply/Add                              *
+*************************************************/
+inline word word_madd3(word a, word b, word c, word* d)
+   {
+   dword z = (dword)a * b + c + *d;
+   *d = (word)(z >> BOTAN_MP_WORD_BITS);
+   return (word)z;
+   }
+
+}
+
+}
+
+#endif