Index: dll/3rdparty/mbedtls/bignum.c
===================================================================
--- dll/3rdparty/mbedtls/bignum.c	(revision 72913)
+++ dll/3rdparty/mbedtls/bignum.c	(working copy)
@@ -1090,6 +1090,49 @@
     return( mbedtls_mpi_sub_mpi( X, A, &_B ) );
 }
 
+#ifdef __REACTOS__
+#ifdef _MSC_VER
+
+//  MSVC
+#define cpuid(info, x) __cpuidex(info, x, 0)
+
+#else
+
+// GCC
+#if defined(__i386__) && defined(__PIC__)
+/* %ebx may be the PIC register.  */
+#define __cpuid(level, a, b, c, d) \
+    __asm__ ("xchgl\t%%ebx, %1\n\t" \
+             "cpuid\n\t" \
+             "xchgl\t%%ebx, %1\n\t" \
+             : "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
+             : "0" (level))
+#else
+#define __cpuid(level, a, b, c, d) \
+    __asm__ ("cpuid\n\t" \
+             : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \
+             : "0" (level))
+#endif
+#define cpuid(info, x) __cpuid(x, info[0], info[1], info[2], info[3])
+
+#endif /* _MSC_VER */
+
+#if defined(MULADDC_HUIT) && !defined(MBEDTLS_DISABLE_SSE_RUNTIMECHECK)
+int isSSE2Available( )
+{
+    int info[4], nIds;
+    cpuid(info, 0);
+    nIds = info[0];
+
+    //  Detect Features
+    if (nIds >= 0x00000001) {
+        cpuid(info, 0x00000001);
+        return (info[3] & ((int)1 << 26)) != 0;
+    }
+    return 0;
+}
+#endif /* MULADDC_HUIT && !MBEDTLS_DISABLE_SSE_RUNTIMECHECK */
+#endif /* __REACTOS__ */
 /*
  * Helper for mbedtls_mpi multiplication
  */
@@ -1106,6 +1149,10 @@
     mbedtls_mpi_uint c = 0, t = 0;
 
 #if defined(MULADDC_HUIT)
+#if !defined(MBEDTLS_DISABLE_SSE_RUNTIMECHECK)
+    if (isSSE2Available())
+    {
+#endif /* !MBEDTLS_DISABLE_SSE_RUNTIMECHECK */
     for( ; i >= 8; i -= 8 )
     {
         MULADDC_INIT
@@ -1119,6 +1166,44 @@
         MULADDC_CORE
         MULADDC_STOP
     }
+#if !defined(MBEDTLS_DISABLE_SSE_RUNTIMECHECK)
+    }
+    else
+    {
+        for( ; i >= 16; i -= 16 )
+        {
+            MULADDC_INIT
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_CORE   MULADDC_CORE
+
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_STOP
+        }
+
+        for( ; i >= 8; i -= 8 )
+        {
+            MULADDC_INIT
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_CORE   MULADDC_CORE
+
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_CORE   MULADDC_CORE
+            MULADDC_STOP
+        }
+
+        for( ; i > 0; i-- )
+        {
+            MULADDC_INIT
+            MULADDC_CORE
+            MULADDC_STOP
+        }
+    }
+#endif /* !MBEDTLS_DISABLE_SSE_RUNTIMECHECK */
 #else /* MULADDC_HUIT */
     for( ; i >= 16; i -= 16 )
     {