[O] Reduce code

src/main/java/icu/samnyan/aqua/sega/aimedb/AimeDbEncryption.kt

@@ -0,0 +1,20 @@
+package icu.samnyan.aqua.sega.aimedb
+
+import icu.samnyan.aqua.sega.util.ByteBufUtil
+import io.netty.buffer.ByteBuf
+import io.netty.buffer.Unpooled.copiedBuffer
+import java.nio.charset.StandardCharsets
+import javax.crypto.Cipher
+import javax.crypto.spec.SecretKeySpec
+
+/**
+ * @author samnyan (privateamusement@protonmail.com)
+ */
+object AimeDbEncryption {
+    val KEY = SecretKeySpec("Copyright(C)SEGA".toByteArray(StandardCharsets.UTF_8), "AES")
+    val cipher = Cipher.getInstance("AES/ECB/NoPadding").apply { init(Cipher.ENCRYPT_MODE, KEY) }
+
+    fun decrypt(src: ByteBuf) = copiedBuffer(cipher.doFinal(ByteBufUtil.toBytes(src)))
+
+    fun encrypt(src: ByteBuf) = copiedBuffer(cipher.doFinal(ByteBufUtil.toAllBytes(src)))
+}