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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 1.6.
package org.bouncycastle.asn1;
import org.bouncycastle.util.Arrays;
import java.io.IOException;
/**
* Base class for an application specific object
*/
public class DERApplicationSpecific
extends ASN1Object
{
private final boolean isConstructed;
private final int tag;
private final byte[] octets;
DERApplicationSpecific(
boolean isConstructed,
int tag,
byte[] octets)
{
this.isConstructed = isConstructed;
this.tag = tag;
this.octets = octets;
}
public DERApplicationSpecific(
int tag,
byte[] octets)
{
this(false, tag, octets);
}
public DERApplicationSpecific(
int tag,
DEREncodable object)
throws IOException
{
this(true, tag, object);
}
public DERApplicationSpecific(
boolean explicit,
int tag,
DEREncodable object)
throws IOException
{
if (tag >= 0x1f)
{
throw new IOException("unsupported tag number");
}
byte[] data = object.getDERObject().getDEREncoded();
this.isConstructed = explicit;
this.tag = tag;
if (explicit)
{
this.octets = data;
}
else
{
int lenBytes = getLengthOfLength(data);
byte[] tmp = new byte[data.length - lenBytes];
System.arraycopy(data, lenBytes, tmp, 0, tmp.length);
this.octets = tmp;
}
}
private int getLengthOfLength(byte[] data)
{
int count = 2; // TODO: assumes only a 1 byte tag number
while((data[count - 1] & 0x80) != 0)
{
count++;
}
return count;
}
public boolean isConstructed()
{
return isConstructed;
}
public byte[] getContents()
{
return octets;
}
public int getApplicationTag()
{
return tag;
}
public DERObject getObject()
throws IOException
{
return new ASN1InputStream(getContents()).readObject();
}
/**
* Return the enclosed object assuming implicit tagging.
*
* @param derTagNo the type tag that should be applied to the object's contents.
* @return the resulting object
* @throws IOException if reconstruction fails.
*/
public DERObject getObject(int derTagNo)
throws IOException
{
if (tag >= 0x1f)
{
throw new IOException("unsupported tag number");
}
byte[] tmp = this.getEncoded();
tmp[0] = (byte)derTagNo;
return new ASN1InputStream(tmp).readObject();
}
/* (non-Javadoc)
* @see org.bouncycastle.asn1.DERObject#encode(org.bouncycastle.asn1.DEROutputStream)
*/
void encode(DEROutputStream out) throws IOException
{
int classBits = DERTags.APPLICATION;
if (isConstructed)
{
classBits |= DERTags.CONSTRUCTED;
}
out.writeEncoded(classBits, tag, octets);
}
boolean asn1Equals(
DERObject o)
{
if (!(o instanceof DERApplicationSpecific))
{
return false;
}
DERApplicationSpecific other = (DERApplicationSpecific)o;
return isConstructed == other.isConstructed
&& tag == other.tag
&& Arrays.areEqual(octets, other.octets);
}
public int hashCode()
{
return (isConstructed ? 1 : 0) ^ tag ^ Arrays.hashCode(octets);
}
}