init commit

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

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+using System.IO;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Cms;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Cms;
+
+public class CmsEnvelopedDataParser : CmsContentInfoParser
+{
+	internal RecipientInformationStore recipientInfoStore;
+
+	internal EnvelopedDataParser envelopedData;
+
+	private AlgorithmIdentifier _encAlg;
+
+	private Org.BouncyCastle.Asn1.Cms.AttributeTable _unprotectedAttributes;
+
+	private bool _attrNotRead;
+
+	public AlgorithmIdentifier EncryptionAlgorithmID => _encAlg;
+
+	public string EncryptionAlgOid => _encAlg.Algorithm.Id;
+
+	public Asn1Object EncryptionAlgParams => _encAlg.Parameters?.ToAsn1Object();
+
+	public CmsEnvelopedDataParser(byte[] envelopedData)
+		: this(new MemoryStream(envelopedData, writable: false))
+	{
+	}
+
+	public CmsEnvelopedDataParser(Stream envelopedData)
+		: base(envelopedData)
+	{
+		_attrNotRead = true;
+		this.envelopedData = new EnvelopedDataParser((Asn1SequenceParser)contentInfo.GetContent(16));
+		Asn1Set instance = Asn1Set.GetInstance(this.envelopedData.GetRecipientInfos().ToAsn1Object());
+		EncryptedContentInfoParser encryptedContentInfo = this.envelopedData.GetEncryptedContentInfo();
+		_encAlg = encryptedContentInfo.ContentEncryptionAlgorithm;
+		CmsReadable readable = new CmsProcessableInputStream(((Asn1OctetStringParser)encryptedContentInfo.GetEncryptedContent(4)).GetOctetStream());
+		CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsEnvelopedSecureReadable(_encAlg, readable);
+		recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(instance, secureReadable);
+	}
+
+	public RecipientInformationStore GetRecipientInfos()
+	{
+		return recipientInfoStore;
+	}
+
+	public Org.BouncyCastle.Asn1.Cms.AttributeTable GetUnprotectedAttributes()
+	{
+		if (_unprotectedAttributes == null && _attrNotRead)
+		{
+			Asn1SetParser unprotectedAttrs = envelopedData.GetUnprotectedAttrs();
+			_attrNotRead = false;
+			if (unprotectedAttrs != null)
+			{
+				Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector();
+				IAsn1Convertible asn1Convertible;
+				while ((asn1Convertible = unprotectedAttrs.ReadObject()) != null)
+				{
+					Asn1SequenceParser asn1SequenceParser = (Asn1SequenceParser)asn1Convertible;
+					asn1EncodableVector.Add(asn1SequenceParser.ToAsn1Object());
+				}
+				_unprotectedAttributes = new Org.BouncyCastle.Asn1.Cms.AttributeTable(new DerSet(asn1EncodableVector));
+			}
+		}
+		return _unprotectedAttributes;
+	}
+}