private byte[] getSubjectKeyId(X509Certificate cert) throws IOException {
byte[] extvalue = cert.getExtensionValue(X509Extensions.SubjectKeyIdentifier.getId());
if (extvalue == null) {
return null;
}
ASN1OctetString str =
ASN1OctetString.getInstance(
new ASN1InputStream(new ByteArrayInputStream(extvalue)).readObject());
SubjectKeyIdentifier keyId =
SubjectKeyIdentifier.getInstance(
new ASN1InputStream(new ByteArrayInputStream(str.getOctets())).readObject());
return keyId.getKeyIdentifier();
}
/**
* Reads the value of the <code>SubjectKeyIdentifier</code> extension field of the certificate.
*
* @return Subject key identifier.
*/
public SubjectKeyIdentifier readSubjectKeyIdentifier() {
return SubjectKeyIdentifier.getInstance(read(ExtensionType.SubjectKeyIdentifier));
}