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