/**
* Return a signer information object with passed in SignerInformationStore representing counter
* signatures attached as an unsigned attribute.
*
* @param signerInformation the signerInfo to be used as the basis.
* @param counterSigners signer info objects carrying counter signature.
* @return a copy of the original SignerInformationObject with the changed attributes.
*/
public static SignerInformation addCounterSigners(
SignerInformation signerInformation, SignerInformationStore counterSigners) {
// TODO Perform checks from RFC 3852 11.4
SignerInfo sInfo = signerInformation.info;
AttributeTable unsignedAttr = signerInformation.getUnsignedAttributes();
ASN1EncodableVector v;
if (unsignedAttr != null) {
v = unsignedAttr.toASN1EncodableVector();
} else {
v = new ASN1EncodableVector();
}
ASN1EncodableVector sigs = new ASN1EncodableVector();
for (Iterator it = counterSigners.getSigners().iterator(); it.hasNext(); ) {
sigs.add(((SignerInformation) it.next()).toSignerInfo());
}
v.add(new Attribute(CMSAttributes.counterSignature, new DERSet(sigs)));
return new SignerInformation(
new SignerInfo(
sInfo.getSID(),
sInfo.getDigestAlgorithm(),
sInfo.getAuthenticatedAttributes(),
sInfo.getDigestEncryptionAlgorithm(),
sInfo.getEncryptedDigest(),
new DERSet(v)),
signerInformation.contentType,
signerInformation.content,
null,
new DefaultSignatureAlgorithmIdentifierFinder());
}
public List<TimestampToken> getSignatureTimestamps() {
if (signatureTimeStamps == null) {
try {
signatureTimeStamps =
UnsignedAttributesHelper.getSignatureTimestamps(
firstSignerInfo.getUnsignedAttributes());
} catch (Exception e) {
ExceptionHandlerTyped.<SPISignatureException>handle(SPISignatureException.class, e);
}
}
return signatureTimeStamps;
}
public void appendSignatureTimeStamp(byte[] timeStampTokenBytes) {
try {
AttributeTable at = firstSignerInfo.getUnsignedAttributes();
firstSignerInfo =
SignerInformation.replaceUnsignedAttributes(
firstSignerInfo, appendTimestampAttribute(timeStampTokenBytes, at));
Collection<SignerInformation> signers = new ArrayList<SignerInformation>(1);
signers.add(firstSignerInfo);
SignerInformationStore sis = new SignerInformationStore(signers);
cmsSignedData = CMSSignedData.replaceSigners(cmsSignedData, sis);
} catch (Exception e) {
ExceptionHandlerTyped.<SPISignatureException>handle(SPISignatureException.class, e);
}
}
