1 files changed, 28 insertions, 0 deletions
diff --git a/crypto/src/cms/MacOutputStream.cs b/crypto/src/cms/MacOutputStream.cs
new file mode 100644
index 000000000..8891dbc2c
--- /dev/null
+++ b/crypto/src/cms/MacOutputStream.cs
@@ -0,0 +1,28 @@
+using System;
+
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Utilities.IO;
+
+namespace Org.BouncyCastle.Cms
+{
+	internal class MacOutputStream
+		: BaseOutputStream
+	{
+		private readonly IMac mac;
+
+		internal MacOutputStream(IMac mac)
+		{
+			this.mac = mac;
+		}
+
+		public override void Write(byte[] b, int off, int len)
+		{
+			mac.BlockUpdate(b, off, len);
+		}
+
+		public override void WriteByte(byte b)
+		{
+			mac.Update(b);
+		}
+	}
+}