Initial commit

arm7/source/loader/TwlAes.h

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+#pragma once
+#include <libtwl/aes/aes.h>
+#include "ndsHeader.h"
+
+/// @brief Class handling AES crypto for DSi roms.
+class TwlAes
+{
+public:
+    /// @brief Sets up AES for the DSi rom with the given \p romHeader.
+    /// @param romHeader The header of the DSi rom to setup AES for.
+    void SetupAes(const nds_header_twl_t* romHeader) const;
+
+    /// @brief Performs modcrypt decryption.
+    /// @param data The data to decrypt.
+    /// @param length The length of the data to decrypt.
+    /// @param iv The AES initialization vector.
+    void DecryptModuleAes(void* data, u32 length, const aes_u128_t* iv) const;
+
+private:
+    void SetupModuleKeyXY(const nds_header_twl_t* romHeader) const;
+    void SetupNandKeyX() const;
+};