CopyManga: Fix missing decrypt password (#9193)

* CopyManga: Allow passing in null for decrypt password.

When we end up with a decrypt password of null (that is, there is no manga-
specific decryption password), fall back to the default password.
Previously, we ended up passing in null instead of a default password.

Also update the default password.

Fixes #9114

* CopyManga: bump extVersionCode.

src/zh/copymanga/build.gradle

@@ -5,7 +5,7 @@ ext {
     extName = 'CopyManga'
     pkgNameSuffix = 'zh.copymanga'
     extClass = '.CopyManga'
-    extVersionCode = 15
+    extVersionCode = 16
 }
 apply from: "$rootDir/common.gradle"
 

src/zh/copymanga/src/eu/kanade/tachiyomi/extension/zh/copymanga/CopyManga.kt

@@ -449,10 +449,10 @@ class CopyManga : ConfigurableSource, HttpSource() {
     }
 
     // thanks to unpacker toolsite, http://matthewfl.com/unPacker.html
-    private fun decryptChapterData(disposableData: String, disposablePass: String? = "hotmanga.aes.key"): String {
+    private fun decryptChapterData(disposableData: String, disposablePass: String?): String {
         val prePart = disposableData.substring(0, 16)
         val postPart = disposableData.substring(16, disposableData.length)
-        val disposablePassByteArray = disposablePass?.toByteArray(Charsets.UTF_8)
+        val disposablePassByteArray = (disposablePass ?: "xxxmanga.abc.key").toByteArray(Charsets.UTF_8)
         val prepartByteArray = prePart.toByteArray(Charsets.UTF_8)
         val dataByteArray = hexStringToByteArray(postPart)