/** * Searches for a holder public key certificate and verifies its * certification path. * * @param attrCert the attribute certificate. * @param pkixParams The PKIX parameters. * @return The certificate path of the holder certificate. * @throws Exception if * <ul> * <li>no public key certificate can be found although holder * information is given by an entity name or a base certificate * ID</li> * <li>support classes cannot be created</li> * <li>no certification path for the public key certificate can * be built</li> * </ul> */ internal static PkixCertPath ProcessAttrCert1( IX509AttributeCertificate attrCert, PkixParameters pkixParams) { PkixCertPathBuilderResult result = null; // find holder PKCs ISet holderPKCs = new HashSet(); if (attrCert.Holder.GetIssuer() != null) { X509CertStoreSelector selector = new X509CertStoreSelector(); selector.SerialNumber = attrCert.Holder.SerialNumber; X509Name[] principals = attrCert.Holder.GetIssuer(); for (int i = 0; i < principals.Length; i++) { try { // if (principals[i] is X500Principal) { selector.Issuer = principals[i]; } holderPKCs.AddAll(PkixCertPathValidatorUtilities .FindCertificates(selector, pkixParams.GetStores())); } catch (Exception e) { throw new PkixCertPathValidatorException( "Public key certificate for attribute certificate cannot be searched.", e); } } if (holderPKCs.IsEmpty) { throw new PkixCertPathValidatorException( "Public key certificate specified in base certificate ID for attribute certificate cannot be found."); } } if (attrCert.Holder.GetEntityNames() != null) { X509CertStoreSelector selector = new X509CertStoreSelector(); X509Name[] principals = attrCert.Holder.GetEntityNames(); for (int i = 0; i < principals.Length; i++) { try { // if (principals[i] is X500Principal) { selector.Issuer = principals[i]; } holderPKCs.AddAll(PkixCertPathValidatorUtilities .FindCertificates(selector, pkixParams.GetStores())); } catch (Exception e) { throw new PkixCertPathValidatorException( "Public key certificate for attribute certificate cannot be searched.", e); } } if (holderPKCs.IsEmpty) { throw new PkixCertPathValidatorException( "Public key certificate specified in entity name for attribute certificate cannot be found."); } } // verify cert paths for PKCs PkixBuilderParameters parameters = (PkixBuilderParameters) PkixBuilderParameters.GetInstance(pkixParams); PkixCertPathValidatorException lastException = null; foreach (X509Certificate cert in holderPKCs) { X509CertStoreSelector selector = new X509CertStoreSelector(); selector.Certificate = cert; parameters.SetTargetConstraints(selector); PkixCertPathBuilder builder = new PkixCertPathBuilder(); try { result = builder.Build(PkixBuilderParameters.GetInstance(parameters)); } catch (PkixCertPathBuilderException e) { lastException = new PkixCertPathValidatorException( "Certification path for public key certificate of attribute certificate could not be build.", e); } } if (lastException != null) { throw lastException; } return(result.CertPath); }