private byte[] getAuthorityKeyId(X509Certificate cert) throws IOException {
byte[] extvalue = cert.getExtensionValue(X509Extensions.AuthorityKeyIdentifier.getId());
if (extvalue == null) {
return null;
}
DEROctetString oct =
(DEROctetString) (new ASN1InputStream(new ByteArrayInputStream(extvalue)).readObject());
AuthorityKeyIdentifier keyId =
new AuthorityKeyIdentifier(
(ASN1Sequence)
new ASN1InputStream(new ByteArrayInputStream(oct.getOctets())).readObject());
return keyId.getKeyIdentifier();
}
/**
* Reads the value of the <code>AuthorityKeyIdentifier</code> extension field of the certificate.
*
* @return Authority key identifier.
*/
public AuthorityKeyIdentifier readAuthorityKeyIdentifier() {
return AuthorityKeyIdentifier.getInstance(read(ExtensionType.AuthorityKeyIdentifier));
}