/**
* Fetches delta CRLs according to RFC 3280 section 5.2.4.
*
* @param currentDate The date for which the delta CRLs must be valid.
* @param paramsPKIX The extended PKIX parameters.
* @param completeCRL The complete CRL the delta CRL is for.
* @return A <code>Set</code> of <code>X509CRL</code>s with delta CRLs.
* @throws Exception if an exception occurs while picking the delta
* CRLs.
*/
internal static ISet GetDeltaCrls(
DateTime currentDate,
PkixParameters paramsPKIX,
X509Crl completeCRL)
{
X509CrlStoreSelector deltaSelect = new X509CrlStoreSelector();
if (paramsPKIX.Date != null)
{
deltaSelect.DateAndTime = paramsPKIX.Date;
}
else
{
deltaSelect.DateAndTime = new DateTimeObject(currentDate);
}
// 5.2.4 (a)
try
{
IList deltaSelectIssuer = new ArrayList();
deltaSelectIssuer.Add(completeCRL.IssuerDN);
deltaSelect.Issuers = deltaSelectIssuer;
}
catch (IOException e)
{
new Exception("Cannot extract issuer from CRL.", e);
}
BigInteger completeCRLNumber = null;
try
{
Asn1Object asn1Object = GetExtensionValue(completeCRL, X509Extensions.CrlNumber);
if (asn1Object != null)
{
completeCRLNumber = CrlNumber.GetInstance(asn1Object).PositiveValue;
}
}
catch (Exception e)
{
throw new Exception(
"CRL number extension could not be extracted from CRL.", e);
}
// 5.2.4 (b)
byte[] idp = null;
try
{
Asn1Object obj = GetExtensionValue(completeCRL, X509Extensions.IssuingDistributionPoint);
if (obj != null)
{
idp = obj.GetDerEncoded();
}
}
catch (Exception e)
{
throw new Exception(
"Issuing distribution point extension value could not be read.",
e);
}
// 5.2.4 (d)
deltaSelect.MinCrlNumber = (completeCRLNumber == null)
? null
: completeCRLNumber.Add(BigInteger.One);
deltaSelect.IssuingDistributionPoint = idp;
deltaSelect.IssuingDistributionPointEnabled = true;
// 5.2.4 (c)
deltaSelect.MaxBaseCrlNumber = completeCRLNumber;
ISet temp = new HashSet();
// find delta CRLs
try
{
temp.AddAll(PkixCertPathValidatorUtilities.FindCrls(deltaSelect, paramsPKIX.GetAdditionalStores()));
temp.AddAll(PkixCertPathValidatorUtilities.FindCrls(deltaSelect, paramsPKIX.GetStores()));
}
catch (Exception e)
{
throw new Exception("Could not search for delta CRLs.", e);
}
ISet result = new HashSet();
foreach (X509Crl crl in temp)
{
if (isDeltaCrl(crl))
{
result.Add(crl);
}
}
return(result);
}
/**
* Fetches complete CRLs according to RFC 3280.
*
* @param dp The distribution point for which the complete CRL
* @param cert The <code>X509Certificate</code> or
* {@link org.bouncycastle.x509.X509AttributeCertificate} for
* which the CRL should be searched.
* @param currentDate The date for which the delta CRLs must be valid.
* @param paramsPKIX The extended PKIX parameters.
* @return A <code>Set</code> of <code>X509CRL</code>s with complete
* CRLs.
* @throws Exception if an exception occurs while picking the CRLs
* or no CRLs are found.
*/
internal static ISet GetCompleteCrls(
DistributionPoint dp,
object cert,
DateTime currentDate,
PkixParameters paramsPKIX)
{
X509CrlStoreSelector crlselect = new X509CrlStoreSelector();
try
{
ISet issuers = new HashSet();
if (cert is X509V2AttributeCertificate)
{
issuers.Add(((X509V2AttributeCertificate)cert)
.Issuer.GetPrincipals()[0]);
}
else
{
issuers.Add(GetIssuerPrincipal(cert));
}
PkixCertPathValidatorUtilities.GetCrlIssuersFromDistributionPoint(dp, issuers, crlselect, paramsPKIX);
}
catch (Exception e)
{
new Exception("Could not get issuer information from distribution point.", e);
}
if (cert is X509Certificate)
{
crlselect.CertificateChecking = (X509Certificate)cert;
}
else if (cert is X509V2AttributeCertificate)
{
crlselect.AttrCertChecking = (IX509AttributeCertificate)cert;
}
if (paramsPKIX.Date != null)
{
crlselect.DateAndTime = paramsPKIX.Date;
}
else
{
crlselect.DateAndTime = new DateTimeObject(currentDate);
}
crlselect.CompleteCrlEnabled = true;
ISet crls = new HashSet();
try
{
crls.AddAll(PkixCertPathValidatorUtilities.FindCrls(crlselect, paramsPKIX.GetStores()));
crls.AddAll(PkixCertPathValidatorUtilities.FindCrls(crlselect, paramsPKIX.GetAdditionalStores()));
}
catch (Exception e)
{
throw new Exception("Could not search for CRLs.", e);
}
if (crls.IsEmpty)
{
throw new Exception("No CRLs found.");
}
return(crls);
}