1 files changed, 43 insertions, 0 deletions
diff --git a/crypto/src/cms/SigOutputStream.cs b/crypto/src/cms/SigOutputStream.cs
new file mode 100644
index 000000000..a807fa7fc
--- /dev/null
+++ b/crypto/src/cms/SigOutputStream.cs
@@ -0,0 +1,43 @@
+using System;
+
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Utilities.IO;
+using Org.BouncyCastle.Security;
+
+namespace Org.BouncyCastle.Cms
+{
+	internal class SigOutputStream
+		: BaseOutputStream
+	{
+		private readonly ISigner sig;
+
+		internal SigOutputStream(ISigner sig)
+		{
+			this.sig = sig;
+		}
+
+		public override void WriteByte(byte b)
+		{
+			try
+			{
+				sig.Update(b);
+			}
+			catch (SignatureException e)
+			{
+				throw new CmsStreamException("signature problem: " + e);
+			}
+		}
+
+		public override void Write(byte[] b, int off, int len)
+		{
+			try
+			{
+				sig.BlockUpdate(b, off, len);
+			}
+			catch (SignatureException e)
+			{
+				throw new CmsStreamException("signature problem: " + e);
+			}
+		}
+	}
+}
\ No newline at end of file