feat: js支持hex编码解码

app/src/main/assets/help/jsHelp.md

@@ -132,8 +132,18 @@ java.getZipStringContent(url: String, path: String)
 > flags参数可省略，默认Base64.NO_WRAP，查看[flags参数说明](https://blog.csdn.net/zcmain/article/details/97051870)
 ```
 java.base64Decode(str: String, flags: Int)
+java.base64DecodeToByteArray(str: String, flags: Int)
 java.base64Encode(str: String, flags: Int)
 ```
+* Hex
+```
+/* HexString 解码为字节数组 */
+hexDecodeToByteArray(hex: String): ByteArray?
+/* hexString 解码为utf8String*/
+hexDecodeToString(hex: String): String?
+/* utf8 编码为hexString */
+hexEncodeToString(utf8: String): String?
+```
 * 文件
 >  所有对于文件的读写删操作都是相对路径,只能操作阅读缓存/android/data/{package}/cache/内的文件
 ```
@@ -163,7 +173,7 @@ deleteFile(path: String)
 > TripleDES tansformation默认实现DESede/ECB/PKCS5Padding  
 > 内部实现为cn.hutool.crypto 解密加密接口支持ByteArray|Base64String|HexString|InputStream  
 > 输入参数key iv 支持ByteArray|Utf8String  
-> 如果key iv 为Hex Base64,且需要解码为ByteArray，调用java.decodeBase64Hex
+> 如果key iv 为Hex Base64,且需要解码为ByteArray，自行调用java.base64DecodeToByteArray java.hexDecodeToByteArray
 ```
 //解密为ByteArray 字符串
 java.createSymmetricCrypto(transformation, key, iv).decrypt(data)

app/src/main/java/io/legado/app/help/JsExtensions.kt

@@ -319,7 +319,7 @@ interface JsExtensions {
     }
 
     /**
-     * js实现解码,不能删
+     * js实现base64解码,不能删
      */
     fun base64Decode(str: String): String {
         return EncoderUtils.base64Decode(str, Base64.NO_WRAP)
@@ -351,6 +351,19 @@ interface JsExtensions {
         return EncoderUtils.base64Encode(str, flags)
     }
 
+    /* HexString 解码为字节数组 */
+    fun hexDecodeToByteArray(hex: String): ByteArray? {
+        return HexUtil.decodeHex(hex)
+    }
+    /* hexString 解码为utf8String*/
+    fun hexDecodeToString(hex: String): String? {
+        return HexUtil.decodeHexStr(hex)
+    }
+    /* utf8 编码为hexString */
+    fun hexEncodeToString(utf8: String): String? {
+        return HexUtil.encodeHexStr(hex)
+    }
+
     /**
      * 格式化时间
      */
@@ -662,14 +675,7 @@ interface JsExtensions {
      * java.createSymmetricCrypto(transformation, key, iv).encrypt(data)
      * java.createSymmetricCrypto(transformation, key, iv).encryptBase64(data)
      * java.createSymmetricCrypto(transformation, key, iv).encryptHex(data)
-
-     * 如果key iv 为Hex Base64,且需要解码为ByteArray，调用java.decodeBase64Hex
-
     */
-    /* iv key 为Base64String HexString 到ByteArray的转换函数 */
-    fun decodeBase64Hex(str: String): ByteArray? {
-        return SecureUtil.decode(str)
-    }
 
     /* 调用SymmetricCrypto key为null时使用随机密钥*/
     fun createSymmetricCrypto(