diff --git a/app/src/main/java/io/legado/app/help/JsExtensions.kt b/app/src/main/java/io/legado/app/help/JsExtensions.kt
index d449d553c..f317c52b5 100644
--- a/app/src/main/java/io/legado/app/help/JsExtensions.kt
+++ b/app/src/main/java/io/legado/app/help/JsExtensions.kt
@@ -2,6 +2,7 @@ package io.legado.app.help
 
 import io.legado.app.model.analyzeRule.AnalyzeUrl
 import io.legado.app.utils.EncoderUtils
+import io.legado.app.utils.MD5Utils
 import io.legado.app.utils.StringUtils
 import java.util.regex.Pattern
 
@@ -46,4 +47,12 @@ class JsExtensions {
         }
     }
 
+    fun strToMd5By32(str: String?): String? {
+        return MD5Utils.strToMd5By32(str)
+    }
+
+    fun strToMd5By16(str: String?): String? {
+        return MD5Utils.strToMd5By16(str)
+    }
+
 }
diff --git a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
index 5a5cda401..cba7bc0f1 100644
--- a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
+++ b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
@@ -592,6 +592,14 @@ class AnalyzeRule(private var book: BaseBook? = null) {
         }
     }
 
+    fun strToMd5By32(str: String?): String? {
+        return MD5Utils.strToMd5By32(str)
+    }
+
+    fun strToMd5By16(str: String?): String? {
+        return MD5Utils.strToMd5By16(str)
+    }
+
     companion object {
         private val putPattern = Pattern.compile("@put:(\\{[^}]+?\\})", Pattern.CASE_INSENSITIVE)
         private val getPattern = Pattern.compile("@get:\\{([^}]+?)\\}", Pattern.CASE_INSENSITIVE)
diff --git a/app/src/main/java/io/legado/app/utils/MD5Utils.java b/app/src/main/java/io/legado/app/utils/MD5Utils.java
new file mode 100644
index 000000000..8b955b922
--- /dev/null
+++ b/app/src/main/java/io/legado/app/utils/MD5Utils.java
@@ -0,0 +1,44 @@
+package io.legado.app.utils;
+
+/**
+ * Created by newbiechen on 2018/1/1.
+ */
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * 将字符串转化为MD5
+ */
+
+public class MD5Utils {
+
+    public static String strToMd5By32(String str) {
+        if (str == null) return null;
+        String reStr = null;
+        try {
+            MessageDigest md5 = MessageDigest.getInstance("MD5");
+            byte[] bytes = md5.digest(str.getBytes());
+            StringBuilder stringBuffer = new StringBuilder();
+            for (byte b : bytes) {
+                int bt = b & 0xff;
+                if (bt < 16) {
+                    stringBuffer.append(0);
+                }
+                stringBuffer.append(Integer.toHexString(bt));
+            }
+            reStr = stringBuffer.toString();
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        }
+        return reStr;
+    }
+
+    public static String strToMd5By16(String str) {
+        String reStr = strToMd5By32(str);
+        if (reStr != null) {
+            reStr = reStr.substring(8, 24);
+        }
+        return reStr;
+    }
+}