init commit

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

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+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;
+
+public class CmsAuthenticatedDataParser : CmsContentInfoParser
+{
+	internal RecipientInformationStore _recipientInfoStore;
+
+	internal AuthenticatedDataParser authData;
+
+	private AlgorithmIdentifier macAlg;
+
+	private byte[] mac;
+
+	private Org.BouncyCastle.Asn1.Cms.AttributeTable authAttrs;
+
+	private Org.BouncyCastle.Asn1.Cms.AttributeTable unauthAttrs;
+
+	private bool authAttrNotRead;
+
+	private bool unauthAttrNotRead;
+
+	public AlgorithmIdentifier MacAlgorithmID => macAlg;
+
+	public string MacAlgOid => macAlg.Algorithm.Id;
+
+	public Asn1Object MacAlgParams => macAlg.Parameters?.ToAsn1Object();
+
+	public CmsAuthenticatedDataParser(byte[] envelopedData)
+		: this(new MemoryStream(envelopedData, writable: false))
+	{
+	}
+
+	public CmsAuthenticatedDataParser(Stream envelopedData)
+		: base(envelopedData)
+	{
+		authAttrNotRead = true;
+		authData = new AuthenticatedDataParser((Asn1SequenceParser)contentInfo.GetContent(16));
+		Asn1Set instance = Asn1Set.GetInstance(authData.GetRecipientInfos().ToAsn1Object());
+		macAlg = authData.GetMacAlgorithm();
+		ContentInfoParser enapsulatedContentInfo = authData.GetEnapsulatedContentInfo();
+		CmsReadable readable = new CmsProcessableInputStream(((Asn1OctetStringParser)enapsulatedContentInfo.GetContent(4)).GetOctetStream());
+		CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsAuthenticatedSecureReadable(macAlg, readable);
+		_recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(instance, secureReadable);
+	}
+
+	public RecipientInformationStore GetRecipientInfos()
+	{
+		return _recipientInfoStore;
+	}
+
+	public byte[] GetMac()
+	{
+		if (mac == null)
+		{
+			GetAuthAttrs();
+			mac = authData.GetMac().GetOctets();
+		}
+		return Arrays.Clone(mac);
+	}
+
+	public Org.BouncyCastle.Asn1.Cms.AttributeTable GetAuthAttrs()
+	{
+		if (authAttrs == null && authAttrNotRead)
+		{
+			Asn1SetParser asn1SetParser = authData.GetAuthAttrs();
+			authAttrNotRead = false;
+			if (asn1SetParser != null)
+			{
+				Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector();
+				IAsn1Convertible asn1Convertible;
+				while ((asn1Convertible = asn1SetParser.ReadObject()) != null)
+				{
+					Asn1SequenceParser asn1SequenceParser = (Asn1SequenceParser)asn1Convertible;
+					asn1EncodableVector.Add(asn1SequenceParser.ToAsn1Object());
+				}
+				authAttrs = new Org.BouncyCastle.Asn1.Cms.AttributeTable(new DerSet(asn1EncodableVector));
+			}
+		}
+		return authAttrs;
+	}
+
+	public Org.BouncyCastle.Asn1.Cms.AttributeTable GetUnauthAttrs()
+	{
+		if (unauthAttrs == null && unauthAttrNotRead)
+		{
+			Asn1SetParser asn1SetParser = authData.GetUnauthAttrs();
+			unauthAttrNotRead = false;
+			if (asn1SetParser != null)
+			{
+				Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector();
+				IAsn1Convertible asn1Convertible;
+				while ((asn1Convertible = asn1SetParser.ReadObject()) != null)
+				{
+					Asn1SequenceParser asn1SequenceParser = (Asn1SequenceParser)asn1Convertible;
+					asn1EncodableVector.Add(asn1SequenceParser.ToAsn1Object());
+				}
+				unauthAttrs = new Org.BouncyCastle.Asn1.Cms.AttributeTable(new DerSet(asn1EncodableVector));
+			}
+		}
+		return unauthAttrs;
+	}
+}