init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Asn1/Pkcs/RsaesOaepParameters.cs

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+using System;
+using Org.BouncyCastle.Asn1.Oiw;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1.Pkcs;
+
+public class RsaesOaepParameters : Asn1Encodable
+{
+	private AlgorithmIdentifier hashAlgorithm;
+
+	private AlgorithmIdentifier maskGenAlgorithm;
+
+	private AlgorithmIdentifier pSourceAlgorithm;
+
+	public static readonly AlgorithmIdentifier DefaultHashAlgorithm = new AlgorithmIdentifier(OiwObjectIdentifiers.IdSha1, DerNull.Instance);
+
+	public static readonly AlgorithmIdentifier DefaultMaskGenFunction = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, DefaultHashAlgorithm);
+
+	public static readonly AlgorithmIdentifier DefaultPSourceAlgorithm = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdPSpecified, new DerOctetString(new byte[0]));
+
+	public AlgorithmIdentifier HashAlgorithm => hashAlgorithm;
+
+	public AlgorithmIdentifier MaskGenAlgorithm => maskGenAlgorithm;
+
+	public AlgorithmIdentifier PSourceAlgorithm => pSourceAlgorithm;
+
+	public static RsaesOaepParameters GetInstance(object obj)
+	{
+		if (obj is RsaesOaepParameters)
+		{
+			return (RsaesOaepParameters)obj;
+		}
+		if (obj is Asn1Sequence)
+		{
+			return new RsaesOaepParameters((Asn1Sequence)obj);
+		}
+		throw new ArgumentException("Unknown object in factory: " + Platform.GetTypeName(obj), "obj");
+	}
+
+	public RsaesOaepParameters()
+	{
+		hashAlgorithm = DefaultHashAlgorithm;
+		maskGenAlgorithm = DefaultMaskGenFunction;
+		pSourceAlgorithm = DefaultPSourceAlgorithm;
+	}
+
+	public RsaesOaepParameters(AlgorithmIdentifier hashAlgorithm, AlgorithmIdentifier maskGenAlgorithm, AlgorithmIdentifier pSourceAlgorithm)
+	{
+		this.hashAlgorithm = hashAlgorithm;
+		this.maskGenAlgorithm = maskGenAlgorithm;
+		this.pSourceAlgorithm = pSourceAlgorithm;
+	}
+
+	public RsaesOaepParameters(Asn1Sequence seq)
+	{
+		hashAlgorithm = DefaultHashAlgorithm;
+		maskGenAlgorithm = DefaultMaskGenFunction;
+		pSourceAlgorithm = DefaultPSourceAlgorithm;
+		for (int i = 0; i != seq.Count; i++)
+		{
+			Asn1TaggedObject asn1TaggedObject = (Asn1TaggedObject)seq[i];
+			switch (asn1TaggedObject.TagNo)
+			{
+			case 0:
+				hashAlgorithm = AlgorithmIdentifier.GetInstance(asn1TaggedObject, explicitly: true);
+				break;
+			case 1:
+				maskGenAlgorithm = AlgorithmIdentifier.GetInstance(asn1TaggedObject, explicitly: true);
+				break;
+			case 2:
+				pSourceAlgorithm = AlgorithmIdentifier.GetInstance(asn1TaggedObject, explicitly: true);
+				break;
+			default:
+				throw new ArgumentException("unknown tag");
+			}
+		}
+	}
+
+	public override Asn1Object ToAsn1Object()
+	{
+		Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector();
+		if (!hashAlgorithm.Equals(DefaultHashAlgorithm))
+		{
+			asn1EncodableVector.Add(new DerTaggedObject(explicitly: true, 0, hashAlgorithm));
+		}
+		if (!maskGenAlgorithm.Equals(DefaultMaskGenFunction))
+		{
+			asn1EncodableVector.Add(new DerTaggedObject(explicitly: true, 1, maskGenAlgorithm));
+		}
+		if (!pSourceAlgorithm.Equals(DefaultPSourceAlgorithm))
+		{
+			asn1EncodableVector.Add(new DerTaggedObject(explicitly: true, 2, pSourceAlgorithm));
+		}
+		return new DerSequence(asn1EncodableVector);
+	}
+}