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/py_bridge-lin.c

@@ -0,0 +1,74 @@
+#include <Python.h>
+#include <stdlib.h>
+#include <string.h>
+
+static PyObject* module = NULL;
+
+int init_python() {
+    if (!Py_IsInitialized()) {
+        Py_Initialize();
+        if (!Py_IsInitialized()) return 0;
+    }
+    module = PyImport_ImportModule("shamirs_secret_sharing");
+    if (!module) return 0;
+    return 1;
+}
+
+char* py_string_to_c(PyObject* py_str) {
+    const char* temp = PyUnicode_AsUTF8(py_str);
+    if (!temp) return NULL;
+    char* out = (char*)malloc(strlen(temp) + 1);
+    strcpy(out, temp);
+    return out;
+}
+
+char* combine_wrapper(char** shares, int length) {
+    if (!module) if (!init_python()) return NULL;
+
+    PyObject* list = PyList_New(length);
+    for (int i = 0; i < length; i++) {
+        PyList_SetItem(list, i, PyUnicode_FromString(shares[i]));
+    }
+
+    PyObject* func = PyObject_GetAttrString(module, "combine_wrapper");
+    if (!func) return NULL;
+
+    PyObject* args = PyTuple_Pack(2, list, PyLong_FromLong(length));
+    PyObject* result = PyObject_CallObject(func, args);
+
+    Py_XDECREF(func);
+    Py_XDECREF(args);
+    Py_XDECREF(list);
+
+    if (!result) return NULL;
+
+    char* out = py_string_to_c(result);
+    Py_XDECREF(result);
+    return out;
+}
+
+char* split_wrapper(char** secret, int length, int shares_num, int threshold) {
+    if (!module) if (!init_python()) return NULL;
+
+    PyObject* list = PyList_New(length);
+    for (int i = 0; i < length; i++) {
+        PyList_SetItem(list, i, PyUnicode_FromString(secret[i]));
+    }
+
+    PyObject* func = PyObject_GetAttrString(module, "split_wrapper");
+    if (!func) return NULL;
+
+    PyObject* args = PyTuple_Pack(4, list, PyLong_FromLong(length),
+                                     PyLong_FromLong(shares_num), PyLong_FromLong(threshold));
+    PyObject* result = PyObject_CallObject(func, args);
+
+    Py_XDECREF(func);
+    Py_XDECREF(args);
+    Py_XDECREF(list);
+
+    if (!result) return NULL;
+
+    char* out = py_string_to_c(result);
+    Py_XDECREF(result);
+    return out;
+}