init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Cms/CmsEnvelopedData.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 CmsEnvelopedData
+{
+	internal RecipientInformationStore recipientInfoStore;
+
+	internal ContentInfo contentInfo;
+
+	private AlgorithmIdentifier encAlg;
+
+	private Asn1Set unprotectedAttributes;
+
+	public AlgorithmIdentifier EncryptionAlgorithmID => encAlg;
+
+	public string EncryptionAlgOid => encAlg.Algorithm.Id;
+
+	public ContentInfo ContentInfo => contentInfo;
+
+	public CmsEnvelopedData(byte[] envelopedData)
+		: this(CmsUtilities.ReadContentInfo(envelopedData))
+	{
+	}
+
+	public CmsEnvelopedData(Stream envelopedData)
+		: this(CmsUtilities.ReadContentInfo(envelopedData))
+	{
+	}
+
+	public CmsEnvelopedData(ContentInfo contentInfo)
+	{
+		this.contentInfo = contentInfo;
+		EnvelopedData instance = EnvelopedData.GetInstance(contentInfo.Content);
+		Asn1Set recipientInfos = instance.RecipientInfos;
+		EncryptedContentInfo encryptedContentInfo = instance.EncryptedContentInfo;
+		encAlg = encryptedContentInfo.ContentEncryptionAlgorithm;
+		CmsReadable readable = new CmsProcessableByteArray(encryptedContentInfo.EncryptedContent.GetOctets());
+		CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsEnvelopedSecureReadable(encAlg, readable);
+		recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(recipientInfos, secureReadable);
+		unprotectedAttributes = instance.UnprotectedAttrs;
+	}
+
+	public RecipientInformationStore GetRecipientInfos()
+	{
+		return recipientInfoStore;
+	}
+
+	public Org.BouncyCastle.Asn1.Cms.AttributeTable GetUnprotectedAttributes()
+	{
+		if (unprotectedAttributes == null)
+		{
+			return null;
+		}
+		return new Org.BouncyCastle.Asn1.Cms.AttributeTable(unprotectedAttributes);
+	}
+
+	public byte[] GetEncoded()
+	{
+		return contentInfo.GetEncoded();
+	}
+}