1 files changed, 66 insertions, 0 deletions
diff --git a/Crypto/src/cms/CMSCompressedDataGenerator.cs b/Crypto/src/cms/CMSCompressedDataGenerator.cs
new file mode 100644
index 000000000..a6381ced6
--- /dev/null
+++ b/Crypto/src/cms/CMSCompressedDataGenerator.cs
@@ -0,0 +1,66 @@
+using System;
+using System.Collections;
+using System.IO;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Cms;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Utilities.Zlib;
+
+namespace Org.BouncyCastle.Cms
+{
+    /**
+    * General class for generating a compressed CMS message.
+    * <p>
+    * A simple example of usage.</p>
+    * <p>
+    * <pre>
+    *      CMSCompressedDataGenerator fact = new CMSCompressedDataGenerator();
+    *      CMSCompressedData data = fact.Generate(content, algorithm);
+    * </pre>
+	* </p>
+    */
+    public class CmsCompressedDataGenerator
+    {
+        public const string ZLib = "1.2.840.113549.1.9.16.3.8";
+
+		public CmsCompressedDataGenerator()
+        {
+        }
+
+		/**
+        * Generate an object that contains an CMS Compressed Data
+        */
+        public CmsCompressedData Generate(
+            CmsProcessable	content,
+            string			compressionOid)
+        {
+            AlgorithmIdentifier comAlgId;
+            Asn1OctetString comOcts;
+
+            try
+            {
+                MemoryStream bOut = new MemoryStream();
+                ZOutputStream zOut = new ZOutputStream(bOut, JZlib.Z_DEFAULT_COMPRESSION);
+
+				content.Write(zOut);
+
+                zOut.Dispose();
+
+				comAlgId = new AlgorithmIdentifier(new DerObjectIdentifier(compressionOid));
+				comOcts = new BerOctetString(bOut.ToArray());
+            }
+            catch (IOException e)
+            {
+                throw new CmsException("exception encoding data.", e);
+            }
+
+            ContentInfo comContent = new ContentInfo(CmsObjectIdentifiers.Data, comOcts);
+            ContentInfo contentInfo = new ContentInfo(
+                CmsObjectIdentifiers.CompressedData,
+                new CompressedData(comAlgId, comContent));
+
+			return new CmsCompressedData(contentInfo);
+        }
+    }
+}