HashAlgorithmName.cs

namespace System.Security.Cryptography
{
    public struct HashAlgorithmName : IEquatable<HashAlgorithmName>
    {
        private readonly string _name;

        public static HashAlgorithmName MD5 => new HashAlgorithmName("MD5");

        public static HashAlgorithmName SHA1 => new HashAlgorithmName("SHA1");

        public static HashAlgorithmName SHA256 => new HashAlgorithmName("SHA256");

        public static HashAlgorithmName SHA384 => new HashAlgorithmName("SHA384");

        public static HashAlgorithmName SHA512 => new HashAlgorithmName("SHA512");

        public string Name => _name;

        public HashAlgorithmName(string name)
        {
            _name = name;
        }

        public override string ToString()
        {
            return _name ?? string.Empty;
        }

        public override bool Equals(object obj)
        {
            if (obj is HashAlgorithmName)
            {
                return Equals((HashAlgorithmName)obj);
            }
            return false;
        }

        public bool Equals(HashAlgorithmName other)
        {
            return _name == other._name;
        }

        public override int GetHashCode()
        {
            if (_name != null)
            {
                return _name.GetHashCode();
            }
            return 0;
        }

        public static bool operator ==(HashAlgorithmName left, HashAlgorithmName right)
        {
            return left.Equals(right);
        }

        public static bool operator !=(HashAlgorithmName left, HashAlgorithmName right)
        {
            return !(left == right);
        }
    }
}