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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
package org.bouncycastle.asn1.util;
import java.io.IOException;
import java.util.Enumeration;
import org.bouncycastle.asn1.ASN1ApplicationSpecific;
import org.bouncycastle.asn1.ASN1Boolean;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Enumerated;
import org.bouncycastle.asn1.ASN1External;
import org.bouncycastle.asn1.ASN1GeneralizedTime;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.ASN1UTCTime;
import org.bouncycastle.asn1.BERApplicationSpecific;
import org.bouncycastle.asn1.BEROctetString;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.BERSet;
import org.bouncycastle.asn1.BERTaggedObject;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.DERApplicationSpecific;
import org.bouncycastle.asn1.DERBMPString;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERGraphicString;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DERPrintableString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.DERT61String;
import org.bouncycastle.asn1.DERUTF8String;
import org.bouncycastle.asn1.DERVideotexString;
import org.bouncycastle.asn1.DERVisibleString;
import org.bouncycastle.asn1.DLApplicationSpecific;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.encoders.Hex;
/**
* Utility class for dumping ASN.1 objects as (hopefully) human friendly strings.
*/
public class ASN1Dump
{
private static final String TAB = " ";
private static final int SAMPLE_SIZE = 32;
/**
* dump a DER object as a formatted string with indentation
*
* @param obj the ASN1Primitive to be dumped out.
*/
static void _dumpAsString(
String indent,
boolean verbose,
ASN1Primitive obj,
StringBuffer buf)
{
String nl = Strings.lineSeparator();
if (obj instanceof ASN1Sequence)
{
Enumeration e = ((ASN1Sequence)obj).getObjects();
String tab = indent + TAB;
buf.append(indent);
if (obj instanceof BERSequence)
{
buf.append("BER Sequence");
}
else if (obj instanceof DERSequence)
{
buf.append("DER Sequence");
}
else
{
buf.append("Sequence");
}
buf.append(nl);
while (e.hasMoreElements())
{
Object o = e.nextElement();
if (o == null || o.equals(DERNull.INSTANCE))
{
buf.append(tab);
buf.append("NULL");
buf.append(nl);
}
else if (o instanceof ASN1Primitive)
{
_dumpAsString(tab, verbose, (ASN1Primitive)o, buf);
}
else
{
_dumpAsString(tab, verbose, ((ASN1Encodable)o).toASN1Primitive(), buf);
}
}
}
else if (obj instanceof ASN1TaggedObject)
{
String tab = indent + TAB;
buf.append(indent);
if (obj instanceof BERTaggedObject)
{
buf.append("BER Tagged [");
}
else
{
buf.append("Tagged [");
}
ASN1TaggedObject o = (ASN1TaggedObject)obj;
buf.append(Integer.toString(o.getTagNo()));
buf.append(']');
if (!o.isExplicit())
{
buf.append(" IMPLICIT ");
}
buf.append(nl);
_dumpAsString(tab, verbose, o.getObject(), buf);
}
else if (obj instanceof ASN1Set)
{
Enumeration e = ((ASN1Set)obj).getObjects();
String tab = indent + TAB;
buf.append(indent);
if (obj instanceof BERSet)
{
buf.append("BER Set");
}
else if (obj instanceof DERSet)
{
buf.append("DER Set");
}
else
{
buf.append("Set");
}
buf.append(nl);
while (e.hasMoreElements())
{
Object o = e.nextElement();
if (o == null)
{
buf.append(tab);
buf.append("NULL");
buf.append(nl);
}
else if (o instanceof ASN1Primitive)
{
_dumpAsString(tab, verbose, (ASN1Primitive)o, buf);
}
else
{
_dumpAsString(tab, verbose, ((ASN1Encodable)o).toASN1Primitive(), buf);
}
}
}
else if (obj instanceof ASN1OctetString)
{
ASN1OctetString oct = (ASN1OctetString)obj;
if (obj instanceof BEROctetString)
{
buf.append(indent + "BER Constructed Octet String" + "[" + oct.getOctets().length + "] ");
}
else
{
buf.append(indent + "DER Octet String" + "[" + oct.getOctets().length + "] ");
}
if (verbose)
{
buf.append(dumpBinaryDataAsString(indent, oct.getOctets()));
}
else
{
buf.append(nl);
}
}
else if (obj instanceof ASN1ObjectIdentifier)
{
buf.append(indent + "ObjectIdentifier(" + ((ASN1ObjectIdentifier)obj).getId() + ")" + nl);
}
else if (obj instanceof ASN1Boolean)
{
buf.append(indent + "Boolean(" + ((ASN1Boolean)obj).isTrue() + ")" + nl);
}
else if (obj instanceof ASN1Integer)
{
buf.append(indent + "Integer(" + ((ASN1Integer)obj).getValue() + ")" + nl);
}
else if (obj instanceof DERBitString)
{
DERBitString bt = (DERBitString)obj;
buf.append(indent + "DER Bit String" + "[" + bt.getBytes().length + ", " + bt.getPadBits() + "] ");
if (verbose)
{
buf.append(dumpBinaryDataAsString(indent, bt.getBytes()));
}
else
{
buf.append(nl);
}
}
else if (obj instanceof DERIA5String)
{
buf.append(indent + "IA5String(" + ((DERIA5String)obj).getString() + ") " + nl);
}
else if (obj instanceof DERUTF8String)
{
buf.append(indent + "UTF8String(" + ((DERUTF8String)obj).getString() + ") " + nl);
}
else if (obj instanceof DERPrintableString)
{
buf.append(indent + "PrintableString(" + ((DERPrintableString)obj).getString() + ") " + nl);
}
else if (obj instanceof DERVisibleString)
{
buf.append(indent + "VisibleString(" + ((DERVisibleString)obj).getString() + ") " + nl);
}
else if (obj instanceof DERBMPString)
{
buf.append(indent + "BMPString(" + ((DERBMPString)obj).getString() + ") " + nl);
}
else if (obj instanceof DERT61String)
{
buf.append(indent + "T61String(" + ((DERT61String)obj).getString() + ") " + nl);
}
else if (obj instanceof DERGraphicString)
{
buf.append(indent + "GraphicString(" + ((DERGraphicString)obj).getString() + ") " + nl);
}
else if (obj instanceof DERVideotexString)
{
buf.append(indent + "VideotexString(" + ((DERVideotexString)obj).getString() + ") " + nl);
}
else if (obj instanceof ASN1UTCTime)
{
buf.append(indent + "UTCTime(" + ((ASN1UTCTime)obj).getTime() + ") " + nl);
}
else if (obj instanceof ASN1GeneralizedTime)
{
buf.append(indent + "GeneralizedTime(" + ((ASN1GeneralizedTime)obj).getTime() + ") " + nl);
}
else if (obj instanceof BERApplicationSpecific)
{
buf.append(outputApplicationSpecific("BER", indent, verbose, obj, nl));
}
else if (obj instanceof DERApplicationSpecific)
{
buf.append(outputApplicationSpecific("DER", indent, verbose, obj, nl));
}
else if (obj instanceof DLApplicationSpecific)
{
buf.append(outputApplicationSpecific("", indent, verbose, obj, nl));
}
else if (obj instanceof ASN1Enumerated)
{
ASN1Enumerated en = (ASN1Enumerated) obj;
buf.append(indent + "DER Enumerated(" + en.getValue() + ")" + nl);
}
else if (obj instanceof ASN1External)
{
ASN1External ext = (ASN1External) obj;
buf.append(indent + "External " + nl);
String tab = indent + TAB;
if (ext.getDirectReference() != null)
{
buf.append(tab + "Direct Reference: " + ext.getDirectReference().getId() + nl);
}
if (ext.getIndirectReference() != null)
{
buf.append(tab + "Indirect Reference: " + ext.getIndirectReference().toString() + nl);
}
if (ext.getDataValueDescriptor() != null)
{
_dumpAsString(tab, verbose, ext.getDataValueDescriptor(), buf);
}
buf.append(tab + "Encoding: " + ext.getEncoding() + nl);
_dumpAsString(tab, verbose, ext.getExternalContent(), buf);
}
else
{
buf.append(indent + obj.toString() + nl);
}
}
private static String outputApplicationSpecific(String type, String indent, boolean verbose, ASN1Primitive obj, String nl)
{
ASN1ApplicationSpecific app = ASN1ApplicationSpecific.getInstance(obj);
StringBuffer buf = new StringBuffer();
if (app.isConstructed())
{
try
{
ASN1Sequence s = ASN1Sequence.getInstance(app.getObject(BERTags.SEQUENCE));
buf.append(indent + type + " ApplicationSpecific[" + app.getApplicationTag() + "]" + nl);
for (Enumeration e = s.getObjects(); e.hasMoreElements();)
{
_dumpAsString(indent + TAB, verbose, (ASN1Primitive)e.nextElement(), buf);
}
}
catch (IOException e)
{
buf.append(e);
}
return buf.toString();
}
return indent + type + " ApplicationSpecific[" + app.getApplicationTag() + "] (" + Strings.fromByteArray(Hex.encode(app.getContents())) + ")" + nl;
}
/**
* dump out a DER object as a formatted string, in non-verbose mode.
*
* @param obj the ASN1Primitive to be dumped out.
* @return the resulting string.
*/
public static String dumpAsString(
Object obj)
{
return dumpAsString(obj, false);
}
/**
* Dump out the object as a string.
*
* @param obj the object to be dumped
* @param verbose if true, dump out the contents of octet and bit strings.
* @return the resulting string.
*/
public static String dumpAsString(
Object obj,
boolean verbose)
{
StringBuffer buf = new StringBuffer();
if (obj instanceof ASN1Primitive)
{
_dumpAsString("", verbose, (ASN1Primitive)obj, buf);
}
else if (obj instanceof ASN1Encodable)
{
_dumpAsString("", verbose, ((ASN1Encodable)obj).toASN1Primitive(), buf);
}
else
{
return "unknown object type " + obj.toString();
}
return buf.toString();
}
private static String dumpBinaryDataAsString(String indent, byte[] bytes)
{
String nl = Strings.lineSeparator();
StringBuffer buf = new StringBuffer();
indent += TAB;
buf.append(nl);
for (int i = 0; i < bytes.length; i += SAMPLE_SIZE)
{
if (bytes.length - i > SAMPLE_SIZE)
{
buf.append(indent);
buf.append(Strings.fromByteArray(Hex.encode(bytes, i, SAMPLE_SIZE)));
buf.append(TAB);
buf.append(calculateAscString(bytes, i, SAMPLE_SIZE));
buf.append(nl);
}
else
{
buf.append(indent);
buf.append(Strings.fromByteArray(Hex.encode(bytes, i, bytes.length - i)));
for (int j = bytes.length - i; j != SAMPLE_SIZE; j++)
{
buf.append(" ");
}
buf.append(TAB);
buf.append(calculateAscString(bytes, i, bytes.length - i));
buf.append(nl);
}
}
return buf.toString();
}
private static String calculateAscString(byte[] bytes, int off, int len)
{
StringBuffer buf = new StringBuffer();
for (int i = off; i != off + len; i++)
{
if (bytes[i] >= ' ' && bytes[i] <= '~')
{
buf.append((char)bytes[i]);
}
}
return buf.toString();
}
}
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