/*
* $HeadURL: http://juliusdavies.ca/svn/not-yet-commons-ssl/tags/commons-ssl-0.3.9/src/java/org/apache/commons/ssl/ASN1Util.java $
* $Revision: 121 $
* $Date: 2007-11-14 05:26:57 +0000 (Wed, 14 Nov 2007) $
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.commons.ssl;
import org.apache.commons.ssl.asn1.ASN1InputStream;
import org.apache.commons.ssl.asn1.DEREncodable;
import org.apache.commons.ssl.asn1.DERInteger;
import org.apache.commons.ssl.asn1.DERObjectIdentifier;
import org.apache.commons.ssl.asn1.DEROctetString;
import org.apache.commons.ssl.asn1.DERPrintableString;
import org.apache.commons.ssl.asn1.DERSequence;
import org.apache.commons.ssl.asn1.DERSet;
import org.apache.commons.ssl.asn1.DERTaggedObject;
import org.apache.commons.ssl.util.Hex;
import java.io.FileInputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.util.Enumeration;
import java.util.List;
import java.util.Vector;
/**
* @author Credit Union Central of British Columbia
* @author <a href="http://www.cucbc.com/">www.cucbc.com</a>
* @author <a href="mailto:juliusdavies@cucbc.com">juliusdavies@cucbc.com</a>
* @since 16-Nov-2005
*/
public class ASN1Util {
public static boolean DEBUG = false;
public final static BigInteger BIGGEST =
new BigInteger(Integer.toString(Integer.MAX_VALUE));
public static ASN1Structure analyze(byte[] asn1)
throws IOException {
ASN1InputStream asn = new ASN1InputStream(asn1);
DERSequence seq = (DERSequence) asn.readObject();
ASN1Structure pkcs8 = new ASN1Structure();
ASN1Util.analyze(seq, pkcs8, 0);
return pkcs8;
}
public static void main(String[] args) throws Exception {
DEBUG = true;
FileInputStream in = new FileInputStream(args[0]);
byte[] bytes = Util.streamToBytes(in);
List list = PEMUtil.decode(bytes);
if (!list.isEmpty()) {
bytes = ((PEMItem) list.get(0)).getDerBytes();
}
ASN1Structure asn1 = analyze(bytes);
while (asn1.bigPayload != null) {
System.out.println("------------------------------------------");
System.out.println(asn1);
System.out.println("------------------------------------------");
asn1 = analyze(asn1.bigPayload);
}
}
public static void analyze(DEREncodable seq, ASN1Structure pkcs8,
int depth) {
String tag = null;
if (depth >= 2) {
pkcs8.derIntegers = null;
}
Enumeration en;
if (seq instanceof DERSequence) {
en = ((DERSequence) seq).getObjects();
} else if (seq instanceof DERSet) {
en = ((DERSet) seq).getObjects();
} else if (seq instanceof DERTaggedObject) {
DERTaggedObject derTag = (DERTaggedObject) seq;
tag = Integer.toString(derTag.getTagNo());
Vector v = new Vector();
v.add(derTag.getObject());
en = v.elements();
} else {
throw new IllegalArgumentException("DEREncodable must be one of: DERSequence, DERSet, DERTaggedObject");
}
while (en != null && en.hasMoreElements()) {
DEREncodable obj = (DEREncodable) en.nextElement();
if (!(obj instanceof DERSequence) &&
!(obj instanceof DERSet) &&
!(obj instanceof DERTaggedObject)) {
String str = obj.toString();
String name = obj.getClass().getName();
name = name.substring(name.lastIndexOf('.') + 1);
if (tag != null) {
name = " [tag=" + tag + "] " + name;
}
for (int i = 0; i < depth; i++) {
name = " " + name;
}
if (obj instanceof DERInteger) {
DERInteger dInt = (DERInteger) obj;
if (pkcs8.derIntegers != null) {
pkcs8.derIntegers.add(dInt);
}
BigInteger big = dInt.getValue();
int intValue = big.intValue();
if (BIGGEST.compareTo(big) >= 0 && intValue > 0) {
if (pkcs8.iterationCount == 0) {
pkcs8.iterationCount = intValue;
} else if (pkcs8.keySize == 0) {
pkcs8.keySize = intValue;
}
}
str = dInt.getValue().toString();
} else if (obj instanceof DERObjectIdentifier) {
DERObjectIdentifier id = (DERObjectIdentifier) obj;
str = id.getId();
pkcs8.oids.add(str);
if (pkcs8.oid1 == null) {
pkcs8.oid1 = str;
} else if (pkcs8.oid2 == null) {
pkcs8.oid2 = str;
} else if (pkcs8.oid3 == null) {
pkcs8.oid3 = str;
}
} else {
pkcs8.derIntegers = null;
if (obj instanceof DEROctetString) {
DEROctetString oct = (DEROctetString) obj;
byte[] octets = oct.getOctets();
int len = Math.min(10, octets.length);
boolean probablyBinary = false;
for (int i = 0; i < len; i++) {
byte b = octets[i];
boolean isBinary = b > 128 || b < 0;
if (isBinary) {
probablyBinary = true;
break;
}
}
if (probablyBinary && octets.length > 64) {
if (pkcs8.bigPayload == null) {
pkcs8.bigPayload = octets;
}
str = "probably binary";
} else {
str = Hex.encode(octets);
if (octets.length <= 64) {
if (octets.length % 8 == 0) {
if (pkcs8.salt == null) {
pkcs8.salt = octets;
} else if (pkcs8.iv == null) {
pkcs8.iv = octets;
}
} else {
if (pkcs8.smallPayload == null) {
pkcs8.smallPayload = octets;
}
}
}
}
str += " (length=" + octets.length + ")";
} else if (obj instanceof DERPrintableString) {
DERPrintableString dps = (DERPrintableString) obj;
str = dps.getString();
}
}
if (DEBUG) {
System.out.println(name + ": [" + str + "]");
}
} else {
if (tag != null && DEBUG) {
String name = obj.getClass().getName();
name = name.substring(name.lastIndexOf('.') + 1);
name = " [tag=" + tag + "] " + name;
for (int i = 0; i < depth; i++) {
name = " " + name;
}
System.out.println(name);
}
analyze(obj, pkcs8, depth + 1);
}
}
}
}