Load RSA slot_0 data from bootrom; load and decrypt data from native firm for NCCHSecure2 keyslot

src/core/hw/rsa/rsa.h

@@ -0,0 +1,36 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+#include "common/common_types.h"
+
+namespace HW::RSA {
+
+class RsaSlot {
+public:
+    RsaSlot() : init(false) {}
+    RsaSlot(const std::vector<u8>& exponent, const std::vector<u8>& modulus)
+        : init(true), exponent(exponent), modulus(modulus) {}
+    std::vector<u8> GetSignature(const std::vector<u8>& message);
+
+    operator bool() const {
+        // TODO(B3N30): Maybe check if exponent and modulus are vailid
+        return init;
+    }
+
+private:
+    bool init;
+    std::vector<u8> exponent;
+    std::vector<u8> modulus;
+};
+
+void InitSlots();
+
+RsaSlot GetSlot(std::size_t slot_id);
+
+std::vector<u8> CreateASN1Message(const std::vector<u8>& data);
+
+} // namespace HW::RSA