Add Arc4 cipher class draft implementation

Chaos/Cipher/Arc4/Arc4Crypt.hpp

@@ -2,6 +2,7 @@
 #define CHAOS_CIPHER_ARC4CRYPT_HPP
 
 #include "Arc4Gen.hpp"
+#include "Service/SeArray.hpp"
 #include "Service/ChaosException.hpp"
 
 namespace Chaos::Cipher::Arc4
@@ -29,13 +30,15 @@ public:
     template<typename OutputIt, typename InputIt>
     void Encrypt(OutputIt out, InputIt in, uint64_t count)
     {
-        // TODO:
+        EnsureInitialized();
+        EncryptDecryptImpl(out, in, count);
     }
 
     template<typename OutputIt, typename InputIt>
     void Decrypt(OutputIt out, InputIt in, uint64_t count)
     {
-        // TODO:
+        EnsureInitialized();
+        EncryptDecryptImpl(out, in, count);
     }
 
 private:
@@ -56,6 +59,25 @@ private:
         Gen_.Rekey(keyBegin, keyEnd);
         IsInitialized_ = true;
     }
+
+    template<typename OutputIt, typename InputIt>
+    void EncryptDecryptImpl(OutputIt out, InputIt in, uint64_t count)
+    {
+        Service::SeArray<uint8_t, 512> keyBuf;
+
+        while (count > 0)
+        {
+            uint64_t keyMaterialBytes = std::min(keyBuf.Size(), count);
+            Gen_.Generate(keyBuf.Begin(), keyMaterialBytes);
+
+            for (auto keyBufIt = keyBuf.Begin();
+                 keyMaterialBytes > 0 && count > 0;
+                 ++keyBufIt, --keyMaterialBytes, --count)
+            {
+                *out++ = *in++ ^ *keyBufIt;
+            }
+        }
+    }
 };
 
 } // namespace Chaos::Cipher::Arc4