diff --git a/domain/src/main/java/com/github/nullptroma/wallenc/domain/encrypt/Encryptor.kt b/domain/src/main/java/com/github/nullptroma/wallenc/domain/encrypt/Encryptor.kt
index 76ea838..52a7803 100644
--- a/domain/src/main/java/com/github/nullptroma/wallenc/domain/encrypt/Encryptor.kt
+++ b/domain/src/main/java/com/github/nullptroma/wallenc/domain/encrypt/Encryptor.kt
@@ -29,7 +29,7 @@ class Encryptor(private var _secretKey: SecretKey?) : DisposableHandle {
         return String(decryptedBytes, Charsets.UTF_8)
     }
 
-    private fun encryptBytes(bytes: ByteArray): ByteArray {
+    fun encryptBytes(bytes: ByteArray): ByteArray {
         val secretKey = _secretKey ?: throw Exception("Object was disposed")
         val cipher = Cipher.getInstance(AES_SETTINGS)
         val iv = IvParameterSpec(Random.nextBytes(IV_LEN))
@@ -38,7 +38,7 @@ class Encryptor(private var _secretKey: SecretKey?) : DisposableHandle {
         return encryptedBytes
     }
 
-    private fun decryptBytes(bytes: ByteArray): ByteArray {
+    fun decryptBytes(bytes: ByteArray): ByteArray {
         val secretKey = _secretKey ?: throw Exception("Object was disposed")
         val cipher = Cipher.getInstance(AES_SETTINGS)
         val iv = IvParameterSpec(bytes.take(IV_LEN).toByteArray())
diff --git a/domain/src/test/java/com/github/nullptroma/wallenc/domain/EncryptorTest.kt b/domain/src/test/java/com/github/nullptroma/wallenc/domain/EncryptorTest.kt
new file mode 100644
index 0000000..76215dd
--- /dev/null
+++ b/domain/src/test/java/com/github/nullptroma/wallenc/domain/EncryptorTest.kt
@@ -0,0 +1,140 @@
+package com.github.nullptroma.wallenc.domain
+
+import com.github.nullptroma.wallenc.domain.datatypes.EncryptKey
+import com.github.nullptroma.wallenc.domain.encrypt.Encryptor
+import junit.framework.TestCase.assertEquals
+import junit.framework.TestCase.fail
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.core.Is
+import org.hamcrest.core.IsEqual
+import org.hamcrest.core.IsNot
+import org.junit.Assert.assertArrayEquals
+import org.junit.Test
+import java.io.ByteArrayInputStream
+import java.io.ByteArrayOutputStream
+import java.util.Random
+
+class EncryptorTest {
+    val key1 = EncryptKey("key1")
+    val key2 = EncryptKey("key2")
+    val rnd = Random()
+
+    @Test
+    fun `test correct key for StorageEncryptionInfo`() {
+        val encInfo = Encryptor.generateEncryptionInfo(key1)
+        val res = Encryptor.checkKey(key = key1, encInfo = encInfo)
+        assertEquals(true, res)
+    }
+
+    @Test
+    fun `test incorrect key for StorageEncryptionInfo`() {
+        val encInfo = Encryptor.generateEncryptionInfo(key1)
+        val res = Encryptor.checkKey(key = key2, encInfo = encInfo)
+        assertEquals(false, res)
+    }
+
+    @Test
+    fun `test string encryption with the same key`() {
+        val text = "Hello world, my name is Wallenc!"
+        val encryptor = Encryptor(key1.toAesKey())
+        val encryptedText = encryptor.encryptString(text)
+
+        val newEncryptor = Encryptor(key1.toAesKey())
+        val decryptedText = newEncryptor.decryptString(encryptedText)
+
+        assertEquals(text, decryptedText)
+    }
+
+    @Test
+    fun `test string encryption with the wrong key`() {
+        val text = "Hello world, my name is Wallenc!"
+        val encryptor = Encryptor(key1.toAesKey())
+        val encryptedText = encryptor.encryptString(text)
+
+        val newEncryptor = Encryptor(key2.toAesKey())
+        try {
+            val decryptedText = newEncryptor.decryptString(encryptedText)
+            fail("There is not exception on decrypt with wrong key")
+        }
+        catch (e: Exception) {
+            // good
+        }
+    }
+
+    @Test
+    fun `test bytes encryption with the same key`() {
+        val bytes = ByteArray(512)
+        rnd.nextBytes(bytes)
+        val encryptor = Encryptor(key1.toAesKey())
+        val encryptedBytes = encryptor.encryptBytes(bytes)
+
+        val newEncryptor = Encryptor(key1.toAesKey())
+        val decryptedBytes = newEncryptor.decryptBytes(encryptedBytes)
+
+        assertThat(bytes, IsNot.not(IsEqual.equalTo(encryptedBytes)))
+        assertThat(bytes, Is.`is`(IsEqual.equalTo(decryptedBytes)))
+    }
+
+    @Test
+    fun `test bytes encryption with the wrong key`() {
+        val bytes = ByteArray(512)
+        rnd.nextBytes(bytes)
+        val encryptor = Encryptor(key1.toAesKey())
+        val encryptedBytes = encryptor.encryptBytes(bytes)
+
+        val newEncryptor = Encryptor(key2.toAesKey())
+        try {
+            val decryptedBytes = newEncryptor.decryptBytes(encryptedBytes)
+            fail("There is not exception on decrypt with wrong key")
+        }
+        catch (e: Exception) {
+            // good
+        }
+    }
+
+    @Test
+    fun `test stream encryption with the same key`() {
+        val dataLen = 1500
+        val origData = ByteArray(dataLen)
+        rnd.nextBytes(origData)
+        val encryptor = Encryptor(key1.toAesKey())
+
+        val streamForEncrypt = ByteArrayOutputStream(dataLen*3)
+        val encryptedStream = encryptor.encryptStream(streamForEncrypt)
+        encryptedStream.write(origData)
+        encryptedStream.close()
+        val encryptedData = streamForEncrypt.toByteArray()
+
+        val newEncryptor = Encryptor(key1.toAesKey())
+        val streamForDecrypt = ByteArrayInputStream(encryptedData)
+        val decryptedStream = newEncryptor.decryptStream(streamForDecrypt)
+        val decryptedData = decryptedStream.readAllBytes()
+
+        assertArrayEquals(origData, decryptedData)
+    }
+
+    @Test
+    fun `test stream encryption with the wrong key`() {
+        val dataLen = 1500
+        val origData = ByteArray(dataLen)
+        rnd.nextBytes(origData)
+        val encryptor = Encryptor(key1.toAesKey())
+
+        val streamForEncrypt = ByteArrayOutputStream(dataLen*3)
+        val encryptedStream = encryptor.encryptStream(streamForEncrypt)
+        encryptedStream.write(origData)
+        encryptedStream.close()
+        val encryptedData = streamForEncrypt.toByteArray()
+
+        val newEncryptor = Encryptor(key2.toAesKey())
+        try {
+            val streamForDecrypt = ByteArrayInputStream(encryptedData)
+            val decryptedStream = newEncryptor.decryptStream(streamForDecrypt)
+            val decryptedData = decryptedStream.readAllBytes()
+            fail("There is not exception on decrypt with wrong key")
+        }
+        catch (e: Exception) {
+            // good
+        }
+    }
+}
\ No newline at end of file