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using System;
using System.IO;
using System.Text;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Asn1.Utilities
{
public static class Asn1Dump
{
private const string Tab = " ";
private const int SampleSize = 32;
/**
* dump a Der object as a formatted string with indentation
*
* @param obj the Asn1Object to be dumped out.
*/
private static void AsString(string indent, bool verbose, Asn1Object obj, StringBuilder buf)
{
if (obj is Asn1Null)
{
buf.Append(indent);
buf.AppendLine("NULL");
}
else if (obj is Asn1Sequence asn1Sequence)
{
buf.Append(indent);
if (asn1Sequence is BerSequence)
{
buf.AppendLine("BER Sequence");
}
else if (!(asn1Sequence is DLSequence))
{
buf.AppendLine("DER Sequence");
}
else
{
buf.AppendLine("Sequence");
}
string elementsIndent = indent + Tab;
for (int i = 0, count = asn1Sequence.Count; i < count; ++i)
{
AsString(elementsIndent, verbose, asn1Sequence[i].ToAsn1Object(), buf);
}
}
else if (obj is Asn1Set asn1Set)
{
buf.Append(indent);
if (asn1Set is BerSet)
{
buf.AppendLine("BER Set");
}
else if (!(asn1Set is DLSet))
{
buf.AppendLine("DER Set");
}
else
{
buf.AppendLine("Set");
}
string elementsIndent = indent + Tab;
for (int i = 0, count = asn1Set.Count; i < count; ++i)
{
AsString(elementsIndent, verbose, asn1Set[i].ToAsn1Object(), buf);
}
}
else if (obj is Asn1TaggedObject taggedObject)
{
buf.Append(indent);
if (taggedObject is BerTaggedObject)
{
buf.Append("BER Tagged ");
}
else if (!(taggedObject is DLTaggedObject))
{
buf.Append("DER Tagged ");
}
else
{
buf.Append("Tagged ");
}
buf.Append(Asn1Utilities.GetTagText(taggedObject));
if (!taggedObject.IsExplicit())
{
buf.Append(" IMPLICIT ");
}
buf.AppendLine();
string baseIndent = indent + Tab;
AsString(baseIndent, verbose, taggedObject.GetBaseObject().ToAsn1Object(), buf);
}
else if (obj is DerObjectIdentifier oid)
{
buf.Append(indent);
buf.AppendLine("ObjectIdentifier(" + oid.GetID() + ")");
}
else if (obj is Asn1RelativeOid relativeOid)
{
buf.Append(indent);
buf.AppendLine("RelativeOID(" + relativeOid.GetID() + ")");
}
else if (obj is DerBoolean derBoolean)
{
buf.Append(indent);
buf.AppendLine("Boolean(" + derBoolean.IsTrue + ")");
}
else if (obj is DerInteger derInteger)
{
buf.Append(indent);
buf.AppendLine("Integer(" + derInteger.Value + ")");
}
else if (obj is Asn1OctetString oct)
{
byte[] octets = oct.GetOctets();
buf.Append(indent);
if (obj is BerOctetString)
{
buf.AppendLine("BER Octet String[" + octets.Length + "]");
}
else
{
buf.AppendLine("DER Octet String[" + octets.Length + "]");
}
if (verbose)
{
DumpBinaryDataAsString(buf, indent, octets);
}
}
else if (obj is DerBitString bitString)
{
byte[] bytes = bitString.GetBytes();
int padBits = bitString.PadBits;
buf.Append(indent);
if (bitString is BerBitString)
{
buf.AppendLine("BER Bit String[" + bytes.Length + ", " + padBits + "]");
}
else if (bitString is DLBitString)
{
buf.AppendLine("DL Bit String[" + bytes.Length + ", " + padBits + "]");
}
else
{
buf.AppendLine("DER Bit String[" + bytes.Length + ", " + padBits + "]");
}
if (verbose)
{
DumpBinaryDataAsString(buf, indent, bytes);
}
}
else if (obj is DerIA5String ia5String)
{
buf.Append(indent);
buf.AppendLine("IA5String(" + ia5String.GetString() + ")");
}
else if (obj is DerUtf8String utf8String)
{
buf.Append(indent);
buf.AppendLine("UTF8String(" + utf8String.GetString() + ")");
}
else if (obj is DerPrintableString printableString)
{
buf.Append(indent);
buf.AppendLine("PrintableString(" + printableString.GetString() + ")");
}
else if (obj is DerVisibleString visibleString)
{
buf.Append(indent);
buf.AppendLine("VisibleString(" + visibleString.GetString() + ")");
}
else if (obj is DerBmpString bmpString)
{
buf.Append(indent);
buf.AppendLine("BMPString(" + bmpString.GetString() + ")");
}
else if (obj is DerT61String t61String)
{
buf.Append(indent);
buf.AppendLine("T61String(" + t61String.GetString() + ")");
}
else if (obj is DerGraphicString graphicString)
{
buf.Append(indent);
buf.AppendLine("GraphicString(" + graphicString.GetString() + ")");
}
else if (obj is DerVideotexString videotexString)
{
buf.Append(indent);
buf.AppendLine("VideotexString(" + videotexString.GetString() + ")");
}
else if (obj is Asn1UtcTime utcTime)
{
buf.Append(indent);
buf.AppendLine("UTCTime(" + utcTime.TimeString + ")");
}
else if (obj is Asn1GeneralizedTime generalizedTime)
{
buf.Append(indent);
buf.AppendLine("GeneralizedTime(" + generalizedTime.TimeString + ")");
}
else if (obj is DerEnumerated en)
{
buf.Append(indent);
buf.AppendLine("DER Enumerated(" + en.Value + ")");
}
else if (obj is DerExternal ext)
{
buf.Append(indent);
buf.AppendLine("External ");
string tab = indent + Tab;
if (ext.DirectReference != null)
{
buf.Append(tab);
buf.AppendLine("Direct Reference: " + ext.DirectReference.GetID());
}
if (ext.IndirectReference != null)
{
buf.Append(tab);
buf.AppendLine("Indirect Reference: " + ext.IndirectReference.ToString());
}
if (ext.DataValueDescriptor != null)
{
AsString(tab, verbose, ext.DataValueDescriptor, buf);
}
buf.Append(tab);
buf.AppendLine("Encoding: " + ext.Encoding);
AsString(tab, verbose, ext.ExternalContent, buf);
}
else
{
buf.Append(indent);
buf.Append(obj);
buf.AppendLine();
}
}
/// <summary>Parse ASN.1 objects from input <see cref="Stream"/>, and write them to the output.</summary>
public static void Dump(Stream input, TextWriter output)
{
using (var asn1In = new Asn1InputStream(input, int.MaxValue, leaveOpen: true))
{
Asn1Object asn1Object;
while ((asn1Object = asn1In.ReadObject()) != null)
{
output.Write(DumpAsString(asn1Object));
}
}
}
/**
* dump out a DER object as a formatted string, in non-verbose mode
*
* @param obj the Asn1Encodable to be dumped out.
* @return the resulting string.
*/
public static string DumpAsString(Asn1Encodable obj)
{
return DumpAsString(obj, false);
}
/**
* Dump out the object as a string
*
* @param obj the Asn1Encodable to be dumped out.
* @param verbose if true, dump out the contents of octet and bit strings.
* @return the resulting string.
*/
public static string DumpAsString(Asn1Encodable obj, bool verbose)
{
StringBuilder buf = new StringBuilder();
AsString("", verbose, obj.ToAsn1Object(), buf);
return buf.ToString();
}
private static void DumpBinaryDataAsString(StringBuilder buf, string indent, byte[] bytes)
{
if (bytes.Length < 1)
return;
indent += Tab;
for (int i = 0; i < bytes.Length; i += SampleSize)
{
int remaining = bytes.Length - i;
int chunk = System.Math.Min(remaining, SampleSize);
buf.Append(indent);
buf.Append(Hex.ToHexString(bytes, i, chunk));
for (int j = chunk; j < SampleSize; ++j)
{
buf.Append(" ");
}
buf.Append(Tab);
AppendAscString(buf, bytes, i, chunk);
buf.AppendLine();
}
}
private static void AppendAscString(StringBuilder buf, byte[] bytes, int off, int len)
{
for (int i = off; i != off + len; i++)
{
char c = (char)bytes[i];
if (c >= ' ' && c <= '~')
{
buf.Append(c);
}
}
}
}
}
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