diff --git a/ktx/resources/dec b/ktx/resources/dec
new file mode 100644
index 0000000..ba275fd
Binary files /dev/null and b/ktx/resources/dec differ
diff --git a/ktx/resources/enc b/ktx/resources/enc
new file mode 100644
index 0000000..42f5595
Binary files /dev/null and b/ktx/resources/enc differ
diff --git a/ktx/src/main/java/luyao/util/ktx/ext/AesExt.kt b/ktx/src/main/java/luyao/util/ktx/ext/AesExt.kt
new file mode 100644
index 0000000..dc2be33
--- /dev/null
+++ b/ktx/src/main/java/luyao/util/ktx/ext/AesExt.kt
@@ -0,0 +1,91 @@
+package luyao.util.ktx.ext
+
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.security.Key
+import javax.crypto.Cipher
+import javax.crypto.CipherInputStream
+import javax.crypto.KeyGenerator
+import javax.crypto.spec.IvParameterSpec
+import javax.crypto.spec.SecretKeySpec
+
+/**
+ * Created by luyao
+ * on 2019/7/1 16:09
+ */
+
+private const val KEY_ALGORITHM = "AES"
+private const val CIPHER_ALGORITHM_DEFAULT = "AES"
+private const val AES_CFB_NOPADDING = "AES/CFB/NoPadding"
+
+fun ByteArray.aesEncrypt(key: ByteArray, iv: ByteArray, cipherAlgotirhm: String = AES_CFB_NOPADDING): ByteArray {
+    val cipher = initCipher(Cipher.ENCRYPT_MODE, key, iv, cipherAlgotirhm)
+    return cipher.doFinal(this)
+}
+
+fun ByteArray.aesDecrypt(key: ByteArray, iv: ByteArray, cipherAlgotirhm: String = AES_CFB_NOPADDING): ByteArray {
+    val cipher = initCipher(Cipher.DECRYPT_MODE, key, iv, cipherAlgotirhm)
+    return cipher.doFinal(this)
+}
+
+fun File.aesEncrypt(key: ByteArray, iv: ByteArray, destFilePath: String): File? {
+    return handleFile(Cipher.ENCRYPT_MODE, key, iv, path, destFilePath)
+}
+
+fun File.aesDecrypt(key: ByteArray, iv: ByteArray, destFilePath: String): File? {
+    return handleFile(Cipher.DECRYPT_MODE, key, iv, path, destFilePath)
+}
+
+fun initAESKey(size: Int): ByteArray {
+    val kg = KeyGenerator.getInstance(KEY_ALGORITHM)
+    kg.init(size)
+    return kg.generateKey().encoded
+}
+
+private fun toKey(key: ByteArray): Key = SecretKeySpec(key, KEY_ALGORITHM)
+
+private fun initCipher(mode: Int, key: ByteArray, iv: ByteArray, cipherAlgotirhm: String): Cipher {
+    val k = toKey(key)
+    val cipher = Cipher.getInstance(cipherAlgotirhm)
+    val cipherAlgorithm = cipherAlgotirhm.toUpperCase()
+    if (cipherAlgorithm.contains("CFB") || cipherAlgorithm.contains("CBC")
+        || cipherAlgorithm.contains("CTR")
+    )
+        cipher.init(mode, k, IvParameterSpec(iv))
+    else
+        cipher.init(mode, k)
+    return cipher
+}
+
+private fun handleFile(mode: Int, key: ByteArray, iv: ByteArray, sourceFilePath: String, destFilePath: String): File? {
+    val sourceFile = File(sourceFilePath)
+    val destFile = File(destFilePath)
+
+    if (sourceFile.exists() && sourceFile.isFile) {
+        if (!destFile.parentFile.exists()) destFile.parentFile.mkdirs()
+        destFile.createNewFile()
+
+        val inputStream = FileInputStream(sourceFile)
+        val outputStream = FileOutputStream(destFile)
+        val cipher = initCipher(mode, key, iv, AES_CFB_NOPADDING)
+        val cin = CipherInputStream(inputStream, cipher)
+
+        val b = ByteArray(1024)
+        var read = 0
+        do {
+            read = cin.read(b)
+            if (read > 0)
+                outputStream.write(b, 0, read)
+        } while (read > 0)
+
+        outputStream.flush()
+        cin.close()
+        inputStream.close()
+        outputStream.close()
+
+        return destFile
+    }
+    return null
+}
+
diff --git a/ktx/src/main/java/luyao/util/ktx/ext/HashExt.kt b/ktx/src/main/java/luyao/util/ktx/ext/HashExt.kt
index 84683ce..2cb4245 100644
--- a/ktx/src/main/java/luyao/util/ktx/ext/HashExt.kt
+++ b/ktx/src/main/java/luyao/util/ktx/ext/HashExt.kt
@@ -44,7 +44,7 @@ fun ByteArray.sha512Bytes(): ByteArray = hash(this, Hash.SHA512)
 fun ByteArray.sha512(): String = hash(this, Hash.SHA512).toHexString()
 fun String.sha512(charset: Charset = Charset.forName("utf-8")): String = toByteArray(charset).sha512()
 
-fun File.hash(algorithm: Hash): String {
+fun File.hash(algorithm: Hash = Hash.SHA1): String {
     if (!exists() || !isFile) return ""
     val fin: FileInputStream
     val messageDigest: MessageDigest
diff --git a/ktx/src/test/java/luyao/util/ktx/ext/AesExtKtTest.kt b/ktx/src/test/java/luyao/util/ktx/ext/AesExtKtTest.kt
new file mode 100644
index 0000000..af39a99
--- /dev/null
+++ b/ktx/src/test/java/luyao/util/ktx/ext/AesExtKtTest.kt
@@ -0,0 +1,68 @@
+package luyao.util.ktx.ext
+
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import java.io.File
+
+/**
+ * Created by luyao
+ * on 2019/7/1 16:24
+ */
+class AesExtKtTest {
+
+    private val plainText = "luyao"
+    var key: ByteArray = ByteArray(128)
+    var iv: ByteArray = ByteArray(128)
+
+    @Before
+    fun setUp() {
+        key = initAESKey(128)
+        iv = initAESKey(128)
+    }
+
+    @Test
+    fun aesCFB() {
+        val byteEncrypt = plainText.toByteArray().aesEncrypt(key, iv)
+        val byteDecrypt = byteEncrypt.aesDecrypt(key, iv)
+        assertEquals(plainText, String(byteDecrypt))
+    }
+
+    @Test
+    fun aesCBC() {
+        val byteEncrypt = plainText.toByteArray().aesEncrypt(key, iv, "AES/CBC/PKCS5Padding")
+        val byteDecrypt = byteEncrypt.aesDecrypt(key, iv, "AES/CBC/PKCS5Padding")
+        assertEquals(plainText, String(byteDecrypt))
+    }
+
+
+    @Test
+    fun aesECB() {
+        val byteEncrypt = plainText.toByteArray().aesEncrypt(key, iv, "AES/ECB/PKCS5Padding")
+        val byteDecrypt = byteEncrypt.aesDecrypt(key, iv, "AES/ECB/PKCS5Padding")
+        assertEquals(plainText, String(byteDecrypt))
+    }
+
+    @Test
+    fun aesCTR() {
+        val byteEncrypt = plainText.toByteArray().aesEncrypt(key, iv, "AES/CTR/PKCS5Padding")
+        val byteDecrypt = byteEncrypt.aesDecrypt(key, iv, "AES/CTR/PKCS5Padding")
+        assertEquals(plainText, String(byteDecrypt))
+    }
+
+    @Test
+    fun handleFile() {
+        val sourceFilePath = "resources/ELF文件系统格式.pdf"
+        val encFilePath = "resources/enc"
+        val decFilePath = "resources/dec"
+
+        File(sourceFilePath).aesEncrypt(key, iv, encFilePath)
+        File(encFilePath).aesDecrypt(key, iv, decFilePath)
+
+        assertEquals(
+            File(sourceFilePath).hash(),
+            File(decFilePath).hash()
+        )
+    }
+
+}
\ No newline at end of file