diff --git a/app/src/main/java/io/legado/app/help/JsEncodeUtils.kt b/app/src/main/java/io/legado/app/help/JsEncodeUtils.kt
index 96c0848b8..a98b6441f 100644
--- a/app/src/main/java/io/legado/app/help/JsEncodeUtils.kt
+++ b/app/src/main/java/io/legado/app/help/JsEncodeUtils.kt
@@ -3,10 +3,11 @@ package io.legado.app.help
 import android.util.Base64
 import cn.hutool.crypto.digest.DigestUtil
 import cn.hutool.crypto.digest.HMac
-import cn.hutool.crypto.asymmetric.*
 import cn.hutool.crypto.symmetric.SymmetricCrypto
+import io.legado.app.help.crypto.AsymmetricCrypto
+import io.legado.app.help.crypto.Sign
 import io.legado.app.utils.MD5Utils
-import io.legado.app.utils.*
+
 
 /**
  * js加解密扩展类, 在js中通过java变量调用
diff --git a/app/src/main/java/io/legado/app/help/crypto/AsymmetricCrypto.kt b/app/src/main/java/io/legado/app/help/crypto/AsymmetricCrypto.kt
new file mode 100644
index 000000000..9512f7b96
--- /dev/null
+++ b/app/src/main/java/io/legado/app/help/crypto/AsymmetricCrypto.kt
@@ -0,0 +1,52 @@
+package io.legado.app.help
+
+import cn.hutool.crypto.asymmetric.AsymmetricCrypto as HutoolAsymmetricCrypto
+import cn.hutool.crypto.asymmetric.KeyType
+import cn.hutool.crypto.KeyUtil
+import java.io.InputStream
+
+class AsymmetricCrypto(algorithm: String) : HutoolAsymmetricCrypto(algorithm) {
+
+    fun setPrivateKey(key: ByteArray): AsymmetricCrypto {
+        return setPrivateKey(
+            KeyUtil.generatePrivateKey(this.algorithm, key)
+        )
+    }
+    fun setPublicKey(key: String): AsymmetricCrypto = setPrivateKey(key.encodeToByteArray())
+
+    fun setPublicKey(key: ByteArray): AsymmetricCrypto {
+        return setPublicKey(
+            KeyUtil.generatePublicKey(this.algorithm, key)
+        )
+    }
+    fun setPrivateKey(key: String): AsymmetricCrypto = setPrivateKey(key.encodeToByteArray())
+
+    private fun getKeyType(): KeyType {
+        return when {
+            this.publicKey != null -> KeyType.PublicKey
+            this.privateKey != null -> KeyType.PrivateKey
+            else -> KeyType.SecretKey
+        }
+    }
+
+    private fun <T> cryptoDelegate(
+        data: Any,
+        func: (Any, KeyType) -> T
+    ): T {
+        val keyType = getKeyType()
+        return when {
+            data is ByteArray -> func.invoke(data, keyType)
+            data is String -> func.invoke(data, keyType)
+            data is InputStream -> func.invoke(data, keyType)
+            else -> null
+        }
+    }
+    
+    fun decrypt(data: Any): ByteArray? = cryptoDelegate<ByteArray?>(data, decrypt)
+    fun decryptStr(data: Any): String? = cryptoDelegate<String?>(data, decryptStr)
+    
+    fun encrypt(data: Any): ByteArray? = cryptoDelegate<ByteArray?>(data, encrypt)
+    fun encryptHex(data: Any): String? = cryptoDelegate<String?>(data, encryptHex)
+    fun encryptBase64(data: Any): String? =cryptoDelegate<String?>(data, encryptBase64)
+
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/help/crypto/README.md b/app/src/main/java/io/legado/app/help/crypto/README.md
new file mode 100644
index 000000000..13c6380fd
--- /dev/null
+++ b/app/src/main/java/io/legado/app/help/crypto/README.md
@@ -0,0 +1,17 @@
+https://github.com/gedoor/legado/pull/2880
+
+非对称加密一般只能知道其中一个密钥，而RhinoJs调用java方法不能传入null, 因此提供以下重载函数
+```kotlin
+fun setPublicKey(key: ByteArray): T
+fun setPublicKey(key: String): T
+fun setPrivateKey(key: ByteArray): T
+fun setPrivateKey(key: String): T
+
+//自动从公钥开始尝试
+fun decrypt(data: Any): ByteArray?
+fun decryptStr(data: Any): String?
+
+fun encrypt(data: Any): ByteArray?
+fun encryptHex(data: Any): String?
+fun encryptBase64(data: Any): String?
+```
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/help/crypto/Sign.kt b/app/src/main/java/io/legado/app/help/crypto/Sign.kt
new file mode 100644
index 000000000..a63606cf0
--- /dev/null
+++ b/app/src/main/java/io/legado/app/help/crypto/Sign.kt
@@ -0,0 +1,23 @@
+package io.legado.app.help
+
+import cn.hutool.crypto.asymmetric.Sign as HutoolSign
+import cn.hutool.crypto.KeyUtil
+
+class Sign(algorithm: String): HutoolSign(algorithm) {
+
+    fun setPrivateKey(key: ByteArray): Sign {
+        return setPrivateKey(
+            KeyUtil.generatePrivateKey(this.algorithm, key)
+        )
+    }
+    fun setPublicKey(key: String): Sign = setPrivateKey(key.encodeToByteArray())
+
+    fun setPublicKey(key: ByteArray): Sign {
+        return setPublicKey(
+            KeyUtil.generatePublicKey(this.algorithm, key)
+        )
+    }
+    fun setPrivateKey(key: String): Sign = setPrivateKey(key.encodeToByteArray())
+
+}
+