Initial support for symmetric encryption/decryption using OpenSSL.

1 files changed, 50 insertions, 0 deletions

diff --git a/zencore/include/zencore/crypto.h b/zencore/include/zencore/crypto.h
new file mode 100644
index 000000000..4d6ddba47
--- /dev/null
+++ b/zencore/include/zencore/crypto.h
@@ -0,0 +1,50 @@
+
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include <zencore/memory.h>
+#include <zencore/zencore.h>
+
+#include <memory>
+
+namespace zen {
+
+/**
+ * Experimental interface for a symmetric encryption/decryption algorithm.
+ * Currenlty only AES 256 bit CBC is supported using OpenSSL.
+ */
+class SymmetricCipher
+{
+public:
+	virtual ~SymmetricCipher() = default;
+
+	virtual bool Initialize(MemoryView Key, MemoryView InitVector) = 0;
+
+	struct CipherSettings
+	{
+		size_t KeySize		  = 0;
+		size_t InitVectorSize = 0;
+		size_t BlockSize	  = 0;
+	};
+
+	virtual CipherSettings Settings() = 0;
+
+	virtual MemoryView Encrypt(MemoryView Data, MutableMemoryView EncryptionBuffer) = 0;
+
+	virtual MemoryView Decrypt(MemoryView Data, MutableMemoryView DecryptionBuffer) = 0;
+};
+
+std::unique_ptr<SymmetricCipher> MakeNullCipher();
+
+#if ZEN_PLATFORM_WINDOWS
+/**
+ * Create a new instance of a 256 bit AES CBC symmetric cipher.
+ * NOTE: Currenlty only tested on Windows
+ */
+std::unique_ptr<SymmetricCipher> MakeAesCipher();
+#endif
+
+void crypto_forcelink();
+
+}  // namespace zen