2 files changed, 23 insertions, 0 deletions
diff --git a/crypto/src/util/io/MemoryInputStream.cs b/crypto/src/util/io/MemoryInputStream.cs
new file mode 100644
index 000000000..d353314ee
--- /dev/null
+++ b/crypto/src/util/io/MemoryInputStream.cs
@@ -0,0 +1,13 @@
+using System.IO;
+
+namespace Org.BouncyCastle.Utilities.IO
+{
+    public class MemoryInputStream : MemoryStream
+    {
+        public MemoryInputStream(byte[] buffer) : base(buffer, false)
+        {
+        }
+
+        public sealed override bool CanWrite { get { return false; } }
+    }
+}
diff --git a/crypto/src/util/io/MemoryOutputStream.cs b/crypto/src/util/io/MemoryOutputStream.cs
new file mode 100644
index 000000000..a6de64680
--- /dev/null
+++ b/crypto/src/util/io/MemoryOutputStream.cs
@@ -0,0 +1,10 @@
+
+using System.IO;
+
+namespace Org.BouncyCastle.Utilities.IO
+{
+    public class MemoryOutputStream: MemoryStream
+    {
+        public sealed override bool CanRead { get { return false; } }
+    }
+}