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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.crypto.tls;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.x509.X509CertificateStructure;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Vector;
/**
* A representation for a certificate chain as used by an tls server.
*/
public class Certificate
{
/**
* The certificates.
*/
protected X509CertificateStructure[] certs;
/**
* Parse the ServerCertificate message.
*
* @param is The stream where to parse from.
* @return A Certificate object with the certs, the server has sended.
* @throws IOException If something goes wrong during parsing.
*/
protected static Certificate parse(InputStream is) throws IOException
{
X509CertificateStructure[] certs;
int left = TlsUtils.readUint24(is);
Vector tmp = new Vector();
while (left > 0)
{
int size = TlsUtils.readUint24(is);
left -= 3 + size;
byte[] buf = new byte[size];
TlsUtils.readFully(buf, is);
ByteArrayInputStream bis = new ByteArrayInputStream(buf);
ASN1InputStream ais = new ASN1InputStream(bis);
DERObject o = ais.readObject();
tmp.addElement(X509CertificateStructure.getInstance(o));
if (bis.available() > 0)
{
throw new IllegalArgumentException("Sorry, there is garbage data left after the certificate");
}
}
certs = new X509CertificateStructure[tmp.size()];
for (int i = 0; i < tmp.size(); i++)
{
certs[i] = (X509CertificateStructure)tmp.elementAt(i);
}
return new Certificate(certs);
}
/**
* Private constructure from an cert array.
*
* @param certs The certs the chain should contain.
*/
private Certificate(X509CertificateStructure[] certs)
{
this.certs = certs;
}
/**
* @return An array which contains the certs, this chain contains.
*/
public X509CertificateStructure[] getCerts()
{
X509CertificateStructure[] result = new X509CertificateStructure[certs.length];
System.arraycopy(certs, 0, result, 0, certs.length);
return result;
}
}