Rename concept Cipher --> BlockCipher.

Chaos/Cipher/Block/BlockCipher.hpp

@@ -0,0 +1,35 @@
+#ifndef CHAOS_CIPHER_BLOCK_BLOCKCIPHER_HPP
+#define CHAOS_CIPHER_BLOCK_BLOCKCIPHER_HPP
+
+#include <concepts>
+#include <type_traits>
+
+#include "Key.hpp"
+#include "Encryptor.hpp"
+#include "Decryptor.hpp"
+
+namespace Chaos::Cipher::Block
+{
+
+template<typename T>
+concept BlockCipher = requires
+{
+    typename T::Block;
+    typename T::Key;
+    typename T::Encryptor;
+    typename T::Decryptor;
+
+    requires std::unsigned_integral<std::remove_cvref_t<decltype(T::BlockSize)>>;
+    typename std::integral_constant<decltype(T::BlockSize), T::BlockSize>;
+
+    requires std::unsigned_integral<std::remove_cvref_t<decltype(T::KeySize)>>;
+    typename std::integral_constant<decltype(T::KeySize), T::KeySize>;
+
+    requires Key<typename T::Key>;
+    requires Encryptor<typename T::Encryptor>;
+    requires Decryptor<typename T::Decryptor>;
+};
+
+} // namespace Chaos::Cipher::Block
+
+#endif // CHAOS_CIPHER_BLOCK_BLOCKCIPHER_HPP