1 files changed, 126 insertions, 0 deletions
diff --git a/crypto/src/cms/RecipientInformation.cs b/crypto/src/cms/RecipientInformation.cs
new file mode 100644
index 000000000..8b0316be4
--- /dev/null
+++ b/crypto/src/cms/RecipientInformation.cs
@@ -0,0 +1,126 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Nist;
+using Org.BouncyCastle.Asn1.Pkcs;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.IO;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Security;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.Cms
+{
+    public abstract class RecipientInformation
+    {
+		internal RecipientID			rid = new RecipientID();
+		internal AlgorithmIdentifier	keyEncAlg;
+		internal CmsSecureReadable		secureReadable;
+		
+		private byte[] resultMac;
+
+		internal RecipientInformation(
+			AlgorithmIdentifier	keyEncAlg,
+			CmsSecureReadable	secureReadable)
+		{
+			this.keyEncAlg = keyEncAlg;
+			this.secureReadable = secureReadable;
+		}
+
+		internal string GetContentAlgorithmName()
+		{
+			AlgorithmIdentifier algorithm = secureReadable.Algorithm;
+//			return CmsEnvelopedHelper.Instance.GetSymmetricCipherName(algorithm.ObjectID.Id);
+			return algorithm.ObjectID.Id;
+		}
+
+		public RecipientID RecipientID
+        {
+			get { return rid; }
+        }
+
+		public AlgorithmIdentifier KeyEncryptionAlgorithmID
+		{
+			get { return keyEncAlg; }
+		}
+
+		/**
+        * return the object identifier for the key encryption algorithm.
+        * 
+		* @return OID for key encryption algorithm.
+        */
+        public string KeyEncryptionAlgOid
+        {
+			get { return keyEncAlg.ObjectID.Id; }
+        }
+
+		/**
+        * return the ASN.1 encoded key encryption algorithm parameters, or null if
+        * there aren't any.
+        * 
+		* @return ASN.1 encoding of key encryption algorithm parameters.
+        */
+		public Asn1Object KeyEncryptionAlgParams
+		{
+			get
+			{
+				Asn1Encodable ae = keyEncAlg.Parameters;
+
+				return ae == null ? null : ae.ToAsn1Object();
+			}
+		}
+
+		internal CmsTypedStream GetContentFromSessionKey(
+			KeyParameter sKey)
+		{
+			CmsReadable readable = secureReadable.GetReadable(sKey); 
+
+			try
+			{
+				return new CmsTypedStream(readable.GetInputStream());
+			}
+			catch (IOException e)
+			{
+				throw new CmsException("error getting .", e);
+			}
+		}
+
+		public byte[] GetContent(
+            ICipherParameters key)
+        {
+            try
+            {
+				return CmsUtilities.StreamToByteArray(GetContentStream(key).ContentStream);
+            }
+            catch (IOException e)
+            {
+                throw new Exception("unable to parse internal stream: " + e);
+            }
+        }
+
+		/**
+		* Return the MAC calculated for the content stream. Note: this call is only meaningful once all
+		* the content has been read.
+		*
+		* @return  byte array containing the mac.
+		*/
+		public byte[] GetMac()
+		{
+			if (resultMac == null)
+			{
+				object cryptoObject = secureReadable.CryptoObject;
+				if (cryptoObject is IMac)
+				{
+					resultMac = MacUtilities.DoFinal((IMac)cryptoObject);
+				}
+			}
+
+			return Arrays.Clone(resultMac);
+		}
+		
+		public abstract CmsTypedStream GetContentStream(ICipherParameters key);
+	}
+}