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/test_shamir.c

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+/* before being able to run please provide python/c abi with where to find numpy
+set PYTHONHOME=C:\Users\wm\AppData\Local\Programs\Python\Python312
+set PYTHONPATH=%PYTHONHOME%\Lib;%PYTHONHOME%\Lib\site-packages*/
+// compiled w clang -o test_shamir.exe test_shamir.c -L.
+
+// FULL REWORK NEEDED, CAN'T COMPILE NUMPY INTO CABI
+
+
+#include <stdio.h>
+#include <windows.h>
+
+int main() {
+    HMODULE dll = LoadLibraryA("C:\\Users\\wm\\Documents\\projekt_payments.org.im\\crypto\\shamirs_secret_sharing\\shamir_bridge.dll");
+    if (!dll) {
+        printf("Failed to load DLL\n");
+        return 1;
+    }
+
+    typedef char* (*split_func_t)(char** secret, int len, int shares, int threshold);
+    typedef char* (*combine_func_t)(char** shares, int len);
+
+    split_func_t split_secret = (split_func_t)GetProcAddress(dll, "split_secret");
+    combine_func_t combine_shares = (combine_func_t)GetProcAddress(dll, "combine_shares");
+
+    if (!split_secret || !combine_shares) {
+        printf("Failed to get function addresses\n");
+        return 1;
+    }
+
+    char* secret_arr[1];
+    secret_arr[0] = "test";
+
+    char* split_result = split_secret(secret_arr, 1, 3, 3);
+    if (split_result) {
+        printf("Split result: %s\n", split_result);
+    } else {
+        printf("split_secret returned NULL\n");
+    }
+
+    char* shares_arr[3];
+    shares_arr[0] = split_result;
+    shares_arr[1] = split_result; 
+    shares_arr[2] = split_result;
+
+    char* combined = combine_shares(shares_arr, 3);
+    if (combined) {
+        printf("Combined result: %s\n", combined);
+    } else {
+        printf("combine_shares returned NULL\n");
+    }
+
+    FreeLibrary(dll);
+    return 0;
+}