init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Asn1/X509/RsaPublicKeyStructure.cs

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+using System;
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1.X509;
+
+public class RsaPublicKeyStructure : Asn1Encodable
+{
+	private BigInteger modulus;
+
+	private BigInteger publicExponent;
+
+	public BigInteger Modulus => modulus;
+
+	public BigInteger PublicExponent => publicExponent;
+
+	public static RsaPublicKeyStructure GetInstance(Asn1TaggedObject obj, bool explicitly)
+	{
+		return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+	}
+
+	public static RsaPublicKeyStructure GetInstance(object obj)
+	{
+		if (obj == null || obj is RsaPublicKeyStructure)
+		{
+			return (RsaPublicKeyStructure)obj;
+		}
+		if (obj is Asn1Sequence)
+		{
+			return new RsaPublicKeyStructure((Asn1Sequence)obj);
+		}
+		throw new ArgumentException("Invalid RsaPublicKeyStructure: " + Platform.GetTypeName(obj));
+	}
+
+	public RsaPublicKeyStructure(BigInteger modulus, BigInteger publicExponent)
+	{
+		if (modulus == null)
+		{
+			throw new ArgumentNullException("modulus");
+		}
+		if (publicExponent == null)
+		{
+			throw new ArgumentNullException("publicExponent");
+		}
+		if (modulus.SignValue <= 0)
+		{
+			throw new ArgumentException("Not a valid RSA modulus", "modulus");
+		}
+		if (publicExponent.SignValue <= 0)
+		{
+			throw new ArgumentException("Not a valid RSA public exponent", "publicExponent");
+		}
+		this.modulus = modulus;
+		this.publicExponent = publicExponent;
+	}
+
+	private RsaPublicKeyStructure(Asn1Sequence seq)
+	{
+		if (seq.Count != 2)
+		{
+			throw new ArgumentException("Bad sequence size: " + seq.Count);
+		}
+		modulus = DerInteger.GetInstance(seq[0]).PositiveValue;
+		publicExponent = DerInteger.GetInstance(seq[1]).PositiveValue;
+	}
+
+	public override Asn1Object ToAsn1Object()
+	{
+		return new DerSequence(new DerInteger(Modulus), new DerInteger(PublicExponent));
+	}
+}