init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Asn1/DerGenerator.cs

@@ -0,0 +1,87 @@
+using System.IO;
+using Org.BouncyCastle.Utilities.IO;
+
+namespace Org.BouncyCastle.Asn1;
+
+public abstract class DerGenerator : Asn1Generator
+{
+	private bool _tagged = false;
+
+	private bool _isExplicit;
+
+	private int _tagNo;
+
+	protected DerGenerator(Stream outStream)
+		: base(outStream)
+	{
+	}
+
+	protected DerGenerator(Stream outStream, int tagNo, bool isExplicit)
+		: base(outStream)
+	{
+		_tagged = true;
+		_isExplicit = isExplicit;
+		_tagNo = tagNo;
+	}
+
+	private static void WriteLength(Stream outStr, int length)
+	{
+		if (length > 127)
+		{
+			int num = 1;
+			int num2 = length;
+			while ((num2 >>= 8) != 0)
+			{
+				num++;
+			}
+			outStr.WriteByte((byte)(num | 0x80));
+			for (int num3 = (num - 1) * 8; num3 >= 0; num3 -= 8)
+			{
+				outStr.WriteByte((byte)(length >> num3));
+			}
+		}
+		else
+		{
+			outStr.WriteByte((byte)length);
+		}
+	}
+
+	internal static void WriteDerEncoded(Stream outStream, int tag, byte[] bytes)
+	{
+		outStream.WriteByte((byte)tag);
+		WriteLength(outStream, bytes.Length);
+		outStream.Write(bytes, 0, bytes.Length);
+	}
+
+	internal void WriteDerEncoded(int tag, byte[] bytes)
+	{
+		if (_tagged)
+		{
+			int num = _tagNo | 0x80;
+			if (_isExplicit)
+			{
+				int tag2 = _tagNo | 0x20 | 0x80;
+				MemoryStream memoryStream = new MemoryStream();
+				WriteDerEncoded(memoryStream, tag, bytes);
+				WriteDerEncoded(base.Out, tag2, memoryStream.ToArray());
+			}
+			else
+			{
+				if ((tag & 0x20) != 0)
+				{
+					num |= 0x20;
+				}
+				WriteDerEncoded(base.Out, num, bytes);
+			}
+		}
+		else
+		{
+			WriteDerEncoded(base.Out, tag, bytes);
+		}
+	}
+
+	internal static void WriteDerEncoded(Stream outStr, int tag, Stream inStr)
+	{
+		WriteDerEncoded(outStr, tag, Streams.ReadAll(inStr));
+	}
+}