Add some tests for the AesGcm class

mRemoteNGTests/Security/AesGcmTests.cs

@@ -0,0 +1,54 @@
+using System.Security;
+using mRemoteNG.Security;
+using NUnit.Framework;
+
+
+namespace mRemoteNGTests.Security
+{
+    public class AesGcmTests
+    {
+        private SecureString _encryptionKey;
+        private string _plainText;
+
+        [SetUp]
+        public void Setup()
+        {
+            _encryptionKey = "mypassword111111".ConvertToSecureString();
+            _plainText = "MySecret!";
+        }
+
+        [TearDown]
+        public void TearDown()
+        {
+        }
+
+        [Test]
+        public void GetBlockSizeReturnsProperValueForAes()
+        {
+            Assert.That(AESGCM.BlockSizeInBytes, Is.EqualTo(16));
+        }
+
+        [Test]
+        public void EncryptionOutputsBase64String()
+        {
+            var cipherText = AESGCM.Encrypt(_plainText, _encryptionKey);
+            Assert.That(cipherText.IsBase64String, Is.True);
+        }
+
+        [Test]
+        public void DecryptedTextIsEqualToOriginalPlainText()
+        {
+            var cipherText = AESGCM.Encrypt(_plainText, _encryptionKey);
+            var decryptedCipherText = AESGCM.Decrypt(cipherText, _encryptionKey);
+            Assert.That(decryptedCipherText, Is.EqualTo(_plainText));
+        }
+
+        [Test]
+        public void EncryptingTheSameValueReturnsNewCipherTextEachTime()
+        {
+            var cipherText1 = AESGCM.Encrypt(_plainText, _encryptionKey);
+            var cipherText2 = AESGCM.Encrypt(_plainText, _encryptionKey);
+            Assert.That(cipherText1, Is.Not.EqualTo(cipherText2));
+        }
+    }
+}

mRemoteNGTests/mRemoteNGTests.csproj

@@ -105,6 +105,7 @@
     <Compile Include="Config\Connections\SqlUpdateTimerTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Security\AesCryptographyProviderTests.cs" />
+    <Compile Include="Security\AesGcmTests.cs" />
     <Compile Include="UI\Controls\CustomListViewTests.cs" />
     <Compile Include="UI\Controls\TestForm.cs">
       <SubType>Form</SubType>

mRemoteV1/Security/AESGCM.cs

@@ -7,6 +7,7 @@
 
 using System;
 using System.IO;
+using System.Security;
 using System.Text;
 using Org.BouncyCastle.Crypto;
 using Org.BouncyCastle.Crypto.Engines;
@@ -32,6 +33,8 @@ namespace mRemoteNG.Security
         public static readonly int Iterations = 10000;
         public static readonly int MinPasswordLength = 12;
 
+        public static int BlockSizeInBytes => 16;
+
 
         /// <summary>
         /// Helper that generates a random new key on each call.
@@ -44,6 +47,18 @@ namespace mRemoteNG.Security
             return key;
         }
 
+        public static string Encrypt(string plainText, SecureString encryptionKey)
+        {
+            var encryptedText = SimpleEncryptWithPassword(plainText, encryptionKey.ConvertToUnsecureString());
+            return encryptedText;
+        }
+
+        public static string Decrypt(string cipherText, SecureString decryptionKey)
+        {
+            var decryptedText = SimpleDecryptWithPassword(cipherText, decryptionKey.ConvertToUnsecureString());
+            return decryptedText;
+        }
+
         /// <summary>
         /// Simple Encryption And Authentication (AES-GCM) of a UTF8 string.
         /// </summary>

mRemoteV1/mRemoteV1.csproj

@@ -168,6 +168,7 @@
     <Compile Include="Connection\Protocol\VNC\VNCEnum.cs" />
     <Compile Include="Messages\MessageClassEnum.cs" />
     <Compile Include="Security\AesCryptographyProvider.cs" />
+    <Compile Include="Security\AESGCM.cs" />
     <Compile Include="Security\BouncyCastleCryptographyEngine.cs" />
     <Compile Include="Security\Crypt.cs" />
     <Compile Include="Security\Encryptor.cs" />