namespace System.Security.Cryptography
{
    [EditorBrowsable(EditorBrowsableState.Never)]
    [Obsolete("Derived cryptographic types are obsolete. Use the Create method on the base type instead.", DiagnosticId = "SYSLIB0021", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
    public sealed class SHA1CryptoServiceProvider : SHA1
    {
        protected override void HashCore(ReadOnlySpan<byte> source);
    }
}