init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/IO/DigestStream.cs

@@ -0,0 +1,109 @@
+using System.IO;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.IO;
+
+public class DigestStream : Stream
+{
+	protected readonly Stream stream;
+
+	protected readonly IDigest inDigest;
+
+	protected readonly IDigest outDigest;
+
+	public override bool CanRead => stream.CanRead;
+
+	public override bool CanWrite => stream.CanWrite;
+
+	public override bool CanSeek => stream.CanSeek;
+
+	public override long Length => stream.Length;
+
+	public override long Position
+	{
+		get
+		{
+			return stream.Position;
+		}
+		set
+		{
+			stream.Position = value;
+		}
+	}
+
+	public DigestStream(Stream stream, IDigest readDigest, IDigest writeDigest)
+	{
+		this.stream = stream;
+		inDigest = readDigest;
+		outDigest = writeDigest;
+	}
+
+	public virtual IDigest ReadDigest()
+	{
+		return inDigest;
+	}
+
+	public virtual IDigest WriteDigest()
+	{
+		return outDigest;
+	}
+
+	public override int Read(byte[] buffer, int offset, int count)
+	{
+		int num = stream.Read(buffer, offset, count);
+		if (inDigest != null && num > 0)
+		{
+			inDigest.BlockUpdate(buffer, offset, num);
+		}
+		return num;
+	}
+
+	public override int ReadByte()
+	{
+		int num = stream.ReadByte();
+		if (inDigest != null && num >= 0)
+		{
+			inDigest.Update((byte)num);
+		}
+		return num;
+	}
+
+	public override void Write(byte[] buffer, int offset, int count)
+	{
+		if (outDigest != null && count > 0)
+		{
+			outDigest.BlockUpdate(buffer, offset, count);
+		}
+		stream.Write(buffer, offset, count);
+	}
+
+	public override void WriteByte(byte b)
+	{
+		if (outDigest != null)
+		{
+			outDigest.Update(b);
+		}
+		stream.WriteByte(b);
+	}
+
+	public override void Close()
+	{
+		Platform.Dispose(stream);
+		base.Close();
+	}
+
+	public override void Flush()
+	{
+		stream.Flush();
+	}
+
+	public override long Seek(long offset, SeekOrigin origin)
+	{
+		return stream.Seek(offset, origin);
+	}
+
+	public override void SetLength(long length)
+	{
+		stream.SetLength(length);
+	}
+}