Import code from previous AssetBuilder version

src/Crypto/IStreamCipher.h

@@ -0,0 +1,12 @@
+#pragma once
+#include <cstdint>
+
+class IStreamCipher
+{
+public:
+    virtual ~IStreamCipher() = default;
+
+    virtual void SetIV(const uint8_t* iv, size_t ivSize) = 0;
+
+    virtual void Process(const void* plainText, void* cipherText, size_t amount) = 0;
+};