pyobjc-framework-security

import Security import objc def generate_random_bytes(length): """Generates cryptographically secure random bytes using Security.framework.""" # SecRandomCopyBytes is a C function in the Security framework. # We need to load it explicitly if not already exposed as a Python function. # It's usually exposed automatically, but this demonstrates explicit loading for C functions. # The 'b' format indicates a C array of bytes. _functions = [ ('SecRandomCopyBytes', 'iI^v'), # OSStatus SecRandomCopyBytes(SecRandomGeneratorRef, size_t, void *) ] # Load the function from the Security framework bundle # Security.bundle() is the NSBundle for the Security framework # Use globals() to make the loaded function available directly objc.loadBundleFunctions(Security.bundle(), globals(), _functions) buffer = bytearray(length) # kSecRandomDefault is typically passed as the first argument (generatorRef) # Its value is usually 0 for the default generator, or None in PyObjC often works for NULL # The correct value for kSecRandomDefault is implicitly handled by PyObjC for simple cases. # If the function signature is 'iI^v', the 'I' is size_t (length), '^v' is void* (buffer). # PyObjC often allows passing bytearray directly for buffer pointers. # SecRandomCopyBytes(generator, count, bytes) # We use 0 for kSecRandomDefault, and 'buffer' for the output bytes. status = SecRandomCopyBytes(0, length, buffer) if status == 0: # noErr return bytes(buffer) else: raise RuntimeError(f"Failed to generate random bytes: {status}") if __name__ == "__main__": try: random_data = generate_random_bytes(16) print(f"Generated 16 random bytes: {random_data.hex()}") except Exception as e: print(f"Error: {e}")