Crypt module (#549)

- Moved cryptography code out of Tactility project and into a kernel module.
- Converted C++ code to C style interface
- Hardened security

Modules/crypt-module/source/module.cpp

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: Apache-2.0
+#include <tactility/crypt.h>
+#include <tactility/hash.h>
+#include <tactility/module.h>
+
+extern "C" {
+
+static error_t start() {
+    return ERROR_NONE;
+}
+
+static error_t stop() {
+    return ERROR_NONE;
+}
+
+static const ModuleSymbol crypt_module_symbols[] = {
+    DEFINE_MODULE_SYMBOL(crypt_get_iv),
+    DEFINE_MODULE_SYMBOL(crypt_generate_iv),
+    DEFINE_MODULE_SYMBOL(crypt_encrypt),
+    DEFINE_MODULE_SYMBOL(crypt_decrypt),
+    DEFINE_MODULE_SYMBOL(djb2_str),
+    DEFINE_MODULE_SYMBOL(djb2_data),
+    MODULE_SYMBOL_TERMINATOR
+};
+
+Module crypt_module = {
+    .name = "crypt",
+    .start = start,
+    .stop = stop,
+    .symbols = crypt_module_symbols,
+    .internal = nullptr
+};
+
+}