/**
* @param signerInformation {@code SignerInformation}
* @return {@code DERTaggedObject} representing the signed attributes
* @throws DSSException in case of a decoding problem
*/
public static DERTaggedObject getSignedAttributes(final SignerInformation signerInformation)
throws DSSException {
try {
final byte[] encodedSignedAttributes = signerInformation.getEncodedSignedAttributes();
if (encodedSignedAttributes == null) {
return null;
}
final ASN1Set asn1Set = DSSASN1Utils.toASN1Primitive(encodedSignedAttributes);
return new DERTaggedObject(false, 0, asn1Set);
} catch (IOException e) {
throw new DSSException(e);
}
}
/**
* This method checks if a given {@code DEROctetString} is null.
*
* @param derOctetString
* @return
*/
public static boolean isDEROctetStringNull(final DEROctetString derOctetString) {
final byte[] derOctetStringBytes = derOctetString.getOctets();
final ASN1Primitive asn1Null = DSSASN1Utils.toASN1Primitive(derOctetStringBytes);
return DERNull.INSTANCE.equals(asn1Null);
}