init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Cms/RecipientInformation.cs

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+using System;
+using System.IO;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Security;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Cms;
+
+public abstract class RecipientInformation
+{
+	internal RecipientID rid = new RecipientID();
+
+	internal AlgorithmIdentifier keyEncAlg;
+
+	internal CmsSecureReadable secureReadable;
+
+	private byte[] resultMac;
+
+	public RecipientID RecipientID => rid;
+
+	public AlgorithmIdentifier KeyEncryptionAlgorithmID => keyEncAlg;
+
+	public string KeyEncryptionAlgOid => keyEncAlg.Algorithm.Id;
+
+	public Asn1Object KeyEncryptionAlgParams => keyEncAlg.Parameters?.ToAsn1Object();
+
+	internal RecipientInformation(AlgorithmIdentifier keyEncAlg, CmsSecureReadable secureReadable)
+	{
+		this.keyEncAlg = keyEncAlg;
+		this.secureReadable = secureReadable;
+	}
+
+	internal string GetContentAlgorithmName()
+	{
+		AlgorithmIdentifier algorithm = secureReadable.Algorithm;
+		return algorithm.Algorithm.Id;
+	}
+
+	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 ex)
+		{
+			throw new Exception("unable to parse internal stream: " + ex);
+		}
+	}
+
+	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);
+}