From dd22e1ab7ab7b5bac841dae2b62bfa200b36c4d8 Mon Sep 17 00:00:00 2001
From: Hannes Schulze <haschu0103@outlook.de>
Date: Wed, 12 Feb 2025 23:57:32 +0100
Subject: add encryption/decryption

---
 lib/nes/app/crypto/sha256.hh | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 lib/nes/app/crypto/sha256.hh

(limited to 'lib/nes/app/crypto/sha256.hh')

diff --git a/lib/nes/app/crypto/sha256.hh b/lib/nes/app/crypto/sha256.hh
new file mode 100644
index 0000000..55ba202
--- /dev/null
+++ b/lib/nes/app/crypto/sha256.hh
@@ -0,0 +1,28 @@
+#pragma once
+
+#include "nes/common/containers/span.hh"
+#include "nes/common/types.hh"
+
+namespace nes::app
+{
+	class sha256
+	{
+		static constexpr auto length = u32{ 256 / 8 };
+		static constexpr auto block_size = u32{ 512 / 8 };
+
+		u8 data_[length]{};
+
+	public:
+		static auto hash(span<u8 const>) -> sha256;
+
+		auto get_data() const -> span<u8 const, length> { return data_; }
+
+	private:
+		explicit sha256();
+
+		auto combine(span<u8 const, block_size>) -> void;
+
+		auto get(u32 index) -> u32;
+		auto set(u32 index, u32 value) -> void;
+	};
+} // namespace nes::app
\ No newline at end of file
-- 
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