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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;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Vector;
public abstract class ASN1Sequence
extends ASN1Primitive
{
protected Vector seq = new Vector();
/**
* return an ASN1Sequence from the given object.
*
* @param obj the object we want converted.
* @exception IllegalArgumentException if the object cannot be converted.
*/
public static ASN1Sequence getInstance(
Object obj)
{
if (obj == null || obj instanceof ASN1Sequence)
{
return (ASN1Sequence)obj;
}
else if (obj instanceof ASN1SequenceParser)
{
return ASN1Sequence.getInstance(((ASN1SequenceParser)obj).toASN1Primitive());
}
else if (obj instanceof byte[])
{
try
{
return ASN1Sequence.getInstance(fromByteArray((byte[])obj));
}
catch (IOException e)
{
throw new IllegalArgumentException("failed to construct sequence from byte[]: " + e.getMessage());
}
}
else if (obj instanceof ASN1Encodable)
{
ASN1Primitive primitive = ((ASN1Encodable)obj).toASN1Primitive();
if (primitive instanceof ASN1Sequence)
{
return (ASN1Sequence)primitive;
}
}
throw new IllegalArgumentException("unknown object in getInstance: " + obj.getClass().getName());
}
/**
* Return an ASN1 sequence from a tagged object. There is a special
* case here, if an object appears to have been explicitly tagged on
* reading but we were expecting it to be implicitly tagged in the
* normal course of events it indicates that we lost the surrounding
* sequence - so we need to add it back (this will happen if the tagged
* object is a sequence that contains other sequences). If you are
* dealing with implicitly tagged sequences you really should
* be using this method.
*
* @param obj the tagged object.
* @param explicit true if the object is meant to be explicitly tagged,
* false otherwise.
* @exception IllegalArgumentException if the tagged object cannot
* be converted.
*/
public static ASN1Sequence getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
if (explicit)
{
if (!obj.isExplicit())
{
throw new IllegalArgumentException("object implicit - explicit expected.");
}
return ASN1Sequence.getInstance(obj.getObject().toASN1Primitive());
}
else
{
//
// constructed object which appears to be explicitly tagged
// when it should be implicit means we have to add the
// surrounding sequence.
//
if (obj.isExplicit())
{
if (obj instanceof BERTaggedObject)
{
return new BERSequence(obj.getObject());
}
else
{
return new DLSequence(obj.getObject());
}
}
else
{
if (obj.getObject() instanceof ASN1Sequence)
{
return (ASN1Sequence)obj.getObject();
}
}
}
throw new IllegalArgumentException("unknown object in getInstance: " + obj.getClass().getName());
}
/**
* create an empty sequence
*/
protected ASN1Sequence()
{
}
/**
* create a sequence containing one object
*/
protected ASN1Sequence(
ASN1Encodable obj)
{
seq.addElement(obj);
}
/**
* create a sequence containing a vector of objects.
*/
protected ASN1Sequence(
ASN1EncodableVector v)
{
for (int i = 0; i != v.size(); i++)
{
seq.addElement(v.get(i));
}
}
/**
* create a sequence containing a vector of objects.
*/
protected ASN1Sequence(
ASN1Encodable[] array)
{
for (int i = 0; i != array.length; i++)
{
seq.addElement(array[i]);
}
}
public ASN1Encodable[] toArray()
{
ASN1Encodable[] values = new ASN1Encodable[this.size()];
for (int i = 0; i != this.size(); i++)
{
values[i] = this.getObjectAt(i);
}
return values;
}
public Enumeration getObjects()
{
return seq.elements();
}
public ASN1SequenceParser parser()
{
final ASN1Sequence outer = this;
return new ASN1SequenceParser()
{
private final int max = size();
private int index;
public ASN1Encodable readObject() throws IOException
{
if (index == max)
{
return null;
}
ASN1Encodable obj = getObjectAt(index++);
if (obj instanceof ASN1Sequence)
{
return ((ASN1Sequence)obj).parser();
}
if (obj instanceof ASN1Set)
{
return ((ASN1Set)obj).parser();
}
return obj;
}
public ASN1Primitive getLoadedObject()
{
return outer;
}
public ASN1Primitive toASN1Primitive()
{
return outer;
}
};
}
/**
* return the object at the sequence position indicated by index.
*
* @param index the sequence number (starting at zero) of the object
* @return the object at the sequence position indicated by index.
*/
public ASN1Encodable getObjectAt(
int index)
{
return (ASN1Encodable)seq.elementAt(index);
}
/**
* return the number of objects in this sequence.
*
* @return the number of objects in this sequence.
*/
public int size()
{
return seq.size();
}
public int hashCode()
{
Enumeration e = this.getObjects();
int hashCode = size();
while (e.hasMoreElements())
{
Object o = getNext(e);
hashCode *= 17;
hashCode ^= o.hashCode();
}
return hashCode;
}
boolean asn1Equals(
ASN1Primitive o)
{
if (!(o instanceof ASN1Sequence))
{
return false;
}
ASN1Sequence other = (ASN1Sequence)o;
if (this.size() != other.size())
{
return false;
}
Enumeration s1 = this.getObjects();
Enumeration s2 = other.getObjects();
while (s1.hasMoreElements())
{
ASN1Encodable obj1 = getNext(s1);
ASN1Encodable obj2 = getNext(s2);
ASN1Primitive o1 = obj1.toASN1Primitive();
ASN1Primitive o2 = obj2.toASN1Primitive();
if (o1 == o2 || o1.equals(o2))
{
continue;
}
return false;
}
return true;
}
private ASN1Encodable getNext(Enumeration e)
{
ASN1Encodable encObj = (ASN1Encodable)e.nextElement();
return encObj;
}
ASN1Primitive toDERObject()
{
ASN1Sequence derSeq = new DERSequence();
derSeq.seq = this.seq;
return derSeq;
}
ASN1Primitive toDLObject()
{
ASN1Sequence dlSeq = new DLSequence();
dlSeq.seq = this.seq;
return dlSeq;
}
boolean isConstructed()
{
return true;
}
abstract void encode(ASN1OutputStream out)
throws IOException;
public String toString()
{
return seq.toString();
}
}
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