SHA1CryptoServiceProvider.cs

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using System.ComponentModel;
 
namespace System.Security.Cryptography;
 
[Obsolete("Derived cryptographic types are obsolete. Use the Create method on the base type instead.", DiagnosticId = "SYSLIB0021", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
[EditorBrowsable(EditorBrowsableState.Never)]
public sealed class SHA1CryptoServiceProvider : SHA1
{
    private readonly IncrementalHash _incrementalHash;
 
    private bool _running;
 
    public SHA1CryptoServiceProvider()
    {
        _incrementalHash = IncrementalHash.CreateHash(HashAlgorithmName.SHA1);
        HashSizeValue = 160;
    }
 
    public override void Initialize()
    {
        if (_running)
        {
            Span<byte> destination = stackalloc byte[20];
            if (!_incrementalHash.TryGetHashAndReset(destination, out var _))
            {
                throw new CryptographicException();
            }
            _running = false;
        }
    }
 
    protected override void HashCore(byte[] array, int ibStart, int cbSize)
    {
        _running = true;
        _incrementalHash.AppendData(array, ibStart, cbSize);
    }
 
    protected override void HashCore(ReadOnlySpan<byte> source)
    {
        _running = true;
        _incrementalHash.AppendData(source);
    }
 
    protected override byte[] HashFinal()
    {
        _running = false;
        return _incrementalHash.GetHashAndReset();
    }
 
    protected override bool TryHashFinal(Span<byte> destination, out int bytesWritten)
    {
        _running = false;
        return _incrementalHash.TryGetHashAndReset(destination, out bytesWritten);
    }
 
    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            _incrementalHash.Dispose();
        }
        base.Dispose(disposing);
    }
}