1 files changed, 102 insertions, 0 deletions
diff --git a/Crypto/src/asn1/BERGenerator.cs b/Crypto/src/asn1/BERGenerator.cs
new file mode 100644
index 000000000..271572c02
--- /dev/null
+++ b/Crypto/src/asn1/BERGenerator.cs
@@ -0,0 +1,102 @@
+using System.IO;
+
+using Org.BouncyCastle.Utilities.IO;
+
+namespace Org.BouncyCastle.Asn1
+{
+ public class BerGenerator
+ : Asn1Generator
+ {
+ private bool _tagged = false;
+ private bool _isExplicit;
+ private int _tagNo;
+
+ protected BerGenerator(
+ Stream outStream)
+ : base(outStream)
+ {
+ }
+
+ public BerGenerator(
+ Stream outStream,
+ int tagNo,
+ bool isExplicit)
+ : base(outStream)
+ {
+ _tagged = true;
+ _isExplicit = isExplicit;
+ _tagNo = tagNo;
+ }
+
+ public override void AddObject(
+ Asn1Encodable obj)
+ {
+ new BerOutputStream(Out).WriteObject(obj);
+ }
+
+ public override Stream GetRawOutputStream()
+ {
+ return Out;
+ }
+
+ public override void Close()
+ {
+ WriteBerEnd();
+ }
+
+ private void WriteHdr(
+ int tag)
+ {
+ Out.WriteByte((byte) tag);
+ Out.WriteByte(0x80);
+ }
+
+ protected void WriteBerHeader(
+ int tag)
+ {
+ if (_tagged)
+ {
+ int tagNum = _tagNo | Asn1Tags.Tagged;
+
+ if (_isExplicit)
+ {
+ WriteHdr(tagNum | Asn1Tags.Constructed);
+ WriteHdr(tag);
+ }
+ else
+ {
+ if ((tag & Asn1Tags.Constructed) != 0)
+ {
+ WriteHdr(tagNum | Asn1Tags.Constructed);
+ }
+ else
+ {
+ WriteHdr(tagNum);
+ }
+ }
+ }
+ else
+ {
+ WriteHdr(tag);
+ }
+ }
+
+ protected void WriteBerBody(
+ Stream contentStream)
+ {
+ Streams.PipeAll(contentStream, Out);
+ }
+
+ protected void WriteBerEnd()
+ {
+ Out.WriteByte(0x00);
+ Out.WriteByte(0x00);
+
+ if (_tagged && _isExplicit) // write extra end for tag header
+ {
+ Out.WriteByte(0x00);
+ Out.WriteByte(0x00);
+ }
+ }
+ }
+}
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