Added basic cryptography support.

git-svn-id: https://duplicati.googlecode.com/svn/trunk@52 59da171f-624f-0410-aa54-27559c288bec

Duplicati/Encryption/EncryptionBase.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Duplicati.Encryption
+{
+    /// <summary>
+    /// Simple helper class that implements the filebased functions, and wraps them onto the stream based ones
+    /// </summary>
+    public abstract class EncryptionBase : IEncryption
+    {
+        #region IEncryption Members
+
+        public virtual void Encrypt(string inputfile, string outputfile)
+        {
+            using (System.IO.FileStream fs1 = System.IO.File.OpenRead(inputfile))
+            using (System.IO.FileStream fs2 = System.IO.File.Create(outputfile))
+                this.Encrypt(fs1, fs2);
+        }
+
+        public abstract void Encrypt(System.IO.Stream input, System.IO.Stream output);
+
+        public virtual void Decrypt(string inputfile, string outputfile)
+        {
+            using (System.IO.FileStream fs1 = System.IO.File.OpenRead(inputfile))
+            using (System.IO.FileStream fs2 = System.IO.File.Create(outputfile))
+                this.Decrypt(fs1, fs2);
+        }
+
+        public abstract void Decrypt(System.IO.Stream input, System.IO.Stream output);
+
+        #endregion
+    }
+}