First version of Threefish512-CTR with BLAKE3-MAC & a custom shamirs secret sharing port alongside C bridges with test vectors & Compilation instructions

crypto/shamirs_secret_sharing/include/cpython/pyfpe.h

@@ -0,0 +1,15 @@
+#ifndef Py_PYFPE_H
+#define Py_PYFPE_H
+/* Header excluded from the stable API */
+#ifndef Py_LIMITED_API
+
+/* These macros used to do something when Python was built with --with-fpectl,
+ * but support for that was dropped in 3.7. We continue to define them though,
+ * to avoid breaking API users.
+ */
+
+#define PyFPE_START_PROTECT(err_string, leave_stmt)
+#define PyFPE_END_PROTECT(v)
+
+#endif /* !defined(Py_LIMITED_API) */
+#endif /* !Py_PYFPE_H */