CngAlgorithmGroup.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.Security.Cryptography;
 
public sealed class CngAlgorithmGroup : IEquatable<CngAlgorithmGroup>
{
    private static CngAlgorithmGroup s_dh;
 
    private static CngAlgorithmGroup s_dsa;
 
    private static CngAlgorithmGroup s_ecdh;
 
    private static CngAlgorithmGroup s_ecdsa;
 
    private static CngAlgorithmGroup s_rsa;
 
    private readonly string _algorithmGroup;
 
    public string AlgorithmGroup => _algorithmGroup;
 
    public static CngAlgorithmGroup DiffieHellman => s_dh ?? (s_dh = new CngAlgorithmGroup("DH"));
 
    public static CngAlgorithmGroup Dsa => s_dsa ?? (s_dsa = new CngAlgorithmGroup("DSA"));
 
    public static CngAlgorithmGroup ECDiffieHellman => s_ecdh ?? (s_ecdh = new CngAlgorithmGroup("ECDH"));
 
    public static CngAlgorithmGroup ECDsa => s_ecdsa ?? (s_ecdsa = new CngAlgorithmGroup("ECDSA"));
 
    public static CngAlgorithmGroup Rsa => s_rsa ?? (s_rsa = new CngAlgorithmGroup("RSA"));
 
    public CngAlgorithmGroup(string algorithmGroup)
    {
        if (algorithmGroup == null)
        {
            throw new ArgumentNullException("algorithmGroup");
        }
        if (algorithmGroup.Length == 0)
        {
            throw new ArgumentException(System.SR.Format(System.SR.Cryptography_InvalidAlgorithmGroup, algorithmGroup), "algorithmGroup");
        }
        _algorithmGroup = algorithmGroup;
    }
 
    public static bool operator ==(CngAlgorithmGroup? left, CngAlgorithmGroup? right)
    {
        return left?.Equals(right) ?? ((object)right == null);
    }
 
    public static bool operator !=(CngAlgorithmGroup? left, CngAlgorithmGroup? right)
    {
        if ((object)left == null)
        {
            return (object)right != null;
        }
        return !left.Equals(right);
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        return Equals(obj as CngAlgorithmGroup);
    }
 
    public bool Equals([NotNullWhen(true)] CngAlgorithmGroup? other)
    {
        if ((object)other == null)
        {
            return false;
        }
        return _algorithmGroup.Equals(other.AlgorithmGroup);
    }
 
    public override int GetHashCode()
    {
        return _algorithmGroup.GetHashCode();
    }
 
    public override string ToString()
    {
        return _algorithmGroup;
    }
}