init commit

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

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+using Org.BouncyCastle.Asn1.Cms;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Security;
+
+namespace Org.BouncyCastle.Cms;
+
+public class KekRecipientInformation : RecipientInformation
+{
+	private KekRecipientInfo info;
+
+	internal KekRecipientInformation(KekRecipientInfo info, CmsSecureReadable secureReadable)
+		: base(info.KeyEncryptionAlgorithm, secureReadable)
+	{
+		this.info = info;
+		rid = new RecipientID();
+		KekIdentifier kekID = info.KekID;
+		rid.KeyIdentifier = kekID.KeyIdentifier.GetOctets();
+	}
+
+	public override CmsTypedStream GetContentStream(ICipherParameters key)
+	{
+		try
+		{
+			byte[] octets = info.EncryptedKey.GetOctets();
+			IWrapper wrapper = WrapperUtilities.GetWrapper(keyEncAlg.Algorithm.Id);
+			wrapper.Init(forWrapping: false, key);
+			KeyParameter sKey = ParameterUtilities.CreateKeyParameter(GetContentAlgorithmName(), wrapper.Unwrap(octets, 0, octets.Length));
+			return GetContentFromSessionKey(sKey);
+		}
+		catch (SecurityUtilityException e)
+		{
+			throw new CmsException("couldn't create cipher.", e);
+		}
+		catch (InvalidKeyException e2)
+		{
+			throw new CmsException("key invalid in message.", e2);
+		}
+	}
+}