Create Animekai decoder.kt

src/en/animekai/src/eu/kanade/tachiyomi/animeextension/Animekai decoder.kt

@@ -0,0 +1,64 @@
+package eu.kanade.tachiyomi.animeextension.en.animekai
+
+import android.util.Base64
+import java.net.URLEncoder
+import java.nio.charset.StandardCharsets
+import java.security.MessageDigest
+import javax.crypto.Cipher
+import javax.crypto.spec.IvParameterSpec
+import javax.crypto.spec.SecretKeySpec
+
+class AnimekaiDecoder {
+    companion object {
+        private const val secret = "T3xKHVZBiNwbzVBDLTlaTw=="
+        private const val iv = "3rR5dURR27mN"
+
+        private fun md5(text: String): ByteArray {
+            val md = MessageDigest.getInstance("MD5")
+            return md.digest(text.toByteArray())
+        }
+
+        private fun decodeBase64(data: String): ByteArray {
+            return Base64.decode(data, Base64.NO_WRAP)
+        }
+
+        private fun encodeBase64(data: ByteArray): String {
+            return Base64.encodeToString(data, Base64.NO_WRAP)
+        }
+    }
+
+    fun generateToken(id: String): String {
+        val time = (System.currentTimeMillis() / 1000).toString()
+        val base = "$id|$time"
+        val encrypted = encrypt(base)
+        return URLEncoder.encode(encrypted, "UTF-8")
+    }
+
+    fun decodeIframeData(data: String): String {
+        return decrypt(data)
+    }
+
+    private fun encrypt(text: String): String {
+        val keyBytes = decodeBase64(secret)
+        val ivSpec = IvParameterSpec(iv.toByteArray(StandardCharsets.UTF_8))
+        val keySpec = SecretKeySpec(keyBytes, "AES")
+
+        val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
+        cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec)
+
+        val encrypted = cipher.doFinal(text.toByteArray(StandardCharsets.UTF_8))
+        return encodeBase64(encrypted)
+    }
+
+    private fun decrypt(base64Data: String): String {
+        val keyBytes = decodeBase64(secret)
+        val ivSpec = IvParameterSpec(iv.toByteArray(StandardCharsets.UTF_8))
+        val keySpec = SecretKeySpec(keyBytes, "AES")
+
+        val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
+        cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec)
+
+        val decrypted = cipher.doFinal(decodeBase64(base64Data))
+        return String(decrypted, StandardCharsets.UTF_8)
+    }
+}