log in and store protected settings

src/Core/Models/EncryptedData.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Bit.Core.Models
+{
+    public class EncryptedData
+    {
+        public EncryptedData() { }
+
+        public EncryptedData(byte[] plainValue)
+        {
+            IV = RandomBytes();
+            Value = ProtectedData.Protect(plainValue, IV, DataProtectionScope.CurrentUser);
+        }
+
+        public byte[] Value { get; set; }
+        public byte[] IV { get; set; }
+
+        public byte[] Decrypt()
+        {
+            return ProtectedData.Unprotect(Value, IV, DataProtectionScope.CurrentUser);
+        }
+
+        private byte[] RandomBytes()
+        {
+            var entropy = new byte[16];
+            new RNGCryptoServiceProvider().GetBytes(entropy);
+            return entropy;
+        }
+    }
+}