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output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Parameters/DHPublicKeyParameters.cs

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+using System;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Math;
+
+namespace Org.BouncyCastle.Crypto.Parameters;
+
+public class DHPublicKeyParameters : DHKeyParameters
+{
+	private readonly BigInteger y;
+
+	public virtual BigInteger Y => y;
+
+	private static BigInteger Validate(BigInteger y, DHParameters dhParams)
+	{
+		if (y == null)
+		{
+			throw new ArgumentNullException("y");
+		}
+		if (y.CompareTo(BigInteger.Two) < 0 || y.CompareTo(dhParams.P.Subtract(BigInteger.Two)) > 0)
+		{
+			throw new ArgumentException("invalid DH public key", "y");
+		}
+		if (dhParams.Q != null && !y.ModPow(dhParams.Q, dhParams.P).Equals(BigInteger.One))
+		{
+			throw new ArgumentException("y value does not appear to be in correct group", "y");
+		}
+		return y;
+	}
+
+	public DHPublicKeyParameters(BigInteger y, DHParameters parameters)
+		: base(isPrivate: false, parameters)
+	{
+		this.y = Validate(y, parameters);
+	}
+
+	public DHPublicKeyParameters(BigInteger y, DHParameters parameters, DerObjectIdentifier algorithmOid)
+		: base(isPrivate: false, parameters, algorithmOid)
+	{
+		this.y = Validate(y, parameters);
+	}
+
+	public override bool Equals(object obj)
+	{
+		if (obj == this)
+		{
+			return true;
+		}
+		if (!(obj is DHPublicKeyParameters other))
+		{
+			return false;
+		}
+		return Equals(other);
+	}
+
+	protected bool Equals(DHPublicKeyParameters other)
+	{
+		if (y.Equals(other.y))
+		{
+			return Equals((DHKeyParameters)other);
+		}
+		return false;
+	}
+
+	public override int GetHashCode()
+	{
+		return y.GetHashCode() ^ base.GetHashCode();
+	}
+}