1 files changed, 137 insertions, 0 deletions
diff --git a/crypto/src/cms/CMSAuthenticatedData.cs b/crypto/src/cms/CMSAuthenticatedData.cs
new file mode 100644
index 000000000..5e234da2b
--- /dev/null
+++ b/crypto/src/cms/CMSAuthenticatedData.cs
@@ -0,0 +1,137 @@
+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;
+
+namespace Org.BouncyCastle.Cms
+{
+	/**
+	* containing class for an CMS Authenticated Data object
+	*/
+	public class CmsAuthenticatedData
+	{
+		internal RecipientInformationStore recipientInfoStore;
+		internal ContentInfo contentInfo;
+
+		private AlgorithmIdentifier macAlg;
+		private Asn1Set authAttrs;
+		private Asn1Set unauthAttrs;
+		private byte[] mac;
+
+		public CmsAuthenticatedData(
+			byte[] authData)
+			: this(CmsUtilities.ReadContentInfo(authData))
+		{
+		}
+
+		public CmsAuthenticatedData(
+			Stream authData)
+			: this(CmsUtilities.ReadContentInfo(authData))
+		{
+		}
+
+		public CmsAuthenticatedData(
+			ContentInfo contentInfo)
+		{
+			this.contentInfo = contentInfo;
+
+			AuthenticatedData authData = AuthenticatedData.GetInstance(contentInfo.Content);
+
+			//
+			// read the recipients
+			//
+			Asn1Set recipientInfos = authData.RecipientInfos;
+
+			this.macAlg = authData.MacAlgorithm;
+
+			//
+			// read the authenticated content info
+			//
+			ContentInfo encInfo = authData.EncapsulatedContentInfo;
+			CmsReadable readable = new CmsProcessableByteArray(
+				Asn1OctetString.GetInstance(encInfo.Content).GetOctets());
+			CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsAuthenticatedSecureReadable(
+				this.macAlg, readable);
+
+			//
+			// build the RecipientInformationStore
+			//
+			this.recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(
+				recipientInfos, secureReadable);
+
+			this.authAttrs = authData.AuthAttrs;
+			this.mac = authData.Mac.GetOctets();
+			this.unauthAttrs = authData.UnauthAttrs;
+		}
+
+		public byte[] GetMac()
+		{
+			return Arrays.Clone(mac);
+		}
+
+		public AlgorithmIdentifier MacAlgorithmID
+		{
+			get { return macAlg; }
+		}
+
+		/**
+		* return the object identifier for the content MAC algorithm.
+		*/
+		public string MacAlgOid
+		{
+			get { return macAlg.ObjectID.Id; }
+		}
+
+		/**
+		* return a store of the intended recipients for this message
+		*/
+		public RecipientInformationStore GetRecipientInfos()
+		{
+			return recipientInfoStore;
+		}
+
+		/**
+		 * return the ContentInfo 
+		 */
+		public ContentInfo ContentInfo
+		{
+			get { return contentInfo; }
+		}
+
+		/**
+		* return a table of the digested attributes indexed by
+		* the OID of the attribute.
+		*/
+		public Asn1.Cms.AttributeTable GetAuthAttrs()
+		{
+			if (authAttrs == null)
+				return null;
+
+			return new Asn1.Cms.AttributeTable(authAttrs);
+		}
+
+		/**
+		* return a table of the undigested attributes indexed by
+		* the OID of the attribute.
+		*/
+		public Asn1.Cms.AttributeTable GetUnauthAttrs()
+		{
+			if (unauthAttrs == null)
+				return null;
+
+			return new Asn1.Cms.AttributeTable(unauthAttrs);
+		}
+
+		/**
+		* return the ASN.1 encoded representation of this object.
+		*/
+		public byte[] GetEncoded()
+		{
+			return contentInfo.GetEncoded();
+		}
+	}
+}