exo2: implement through boot config load/validate

libraries/libexosphere/include/exosphere/se/se_hash.hpp

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <vapours.hpp>
+
+namespace ams::se {
+
+    constexpr inline int Sha256HashSize = crypto::Sha256Generator::HashSize;
+
+    union Sha256Hash {
+        u8  bytes[Sha256HashSize / sizeof( u8)];
+        u32 words[Sha256HashSize / sizeof(u32)];
+    };
+
+    void CalculateSha256(Sha256Hash *dst, const void *src, size_t src_size);
+
+}

libraries/libexosphere/include/exosphere/se/se_rsa.hpp

@@ -26,4 +26,6 @@ namespace ams::se {
 
     void SetRsaKey(int slot, const void *mod, size_t mod_size, const void *exp, size_t exp_size);
 
+    void ModularExponentiate(void *dst, size_t dst_size, int slot, const void *src, size_t src_size);
+
 }