using Org.BouncyCastle.Math; using System; namespace Org.BouncyCastle.Crypto.Parameters { public class DsaPublicKeyParameters : DsaKeyParameters { private readonly BigInteger y; public BigInteger Y => y; private static BigInteger Validate(BigInteger y, DsaParameters parameters) { if (parameters != null && (y.CompareTo(BigInteger.Two) < 0 || y.CompareTo(parameters.P.Subtract(BigInteger.Two)) > 0 || !y.ModPow(parameters.Q, parameters.P).Equals(BigInteger.One))) throw new ArgumentException("y value does not appear to be in correct group"); return y; } public DsaPublicKeyParameters(BigInteger y, DsaParameters parameters) : base(false, parameters) { if (y == null) throw new ArgumentNullException("y"); this.y = Validate(y, parameters); } public override bool Equals(object obj) { if (obj == this) return true; DsaPublicKeyParameters dsaPublicKeyParameters = obj as DsaPublicKeyParameters; if (dsaPublicKeyParameters == null) return false; return Equals(dsaPublicKeyParameters); } protected bool Equals(DsaPublicKeyParameters other) { if (y.Equals(other.y)) return Equals((DsaKeyParameters)other); return false; } public override int GetHashCode() { return y.GetHashCode() ^ base.GetHashCode(); } } }