/**
* Build and validate a CertPath using the given parameter.
*
* @param params PKIXBuilderParameters object containing all information to
* build the CertPath
*/
public virtual PkixCertPathBuilderResult Build(
PkixBuilderParameters pkixParams)
{
// search target certificates
IX509Selector certSelect = pkixParams.GetTargetCertConstraints();
if (!(certSelect is X509CertStoreSelector))
{
throw new PkixCertPathBuilderException(
"TargetConstraints must be an instance of "
+ typeof(X509CertStoreSelector).FullName + " for "
+ this.GetType() + " class.");
}
ISet targets = new HashSet();
try
{
targets.AddAll(PkixCertPathValidatorUtilities.FindCertificates((X509CertStoreSelector)certSelect, pkixParams.GetStores()));
// TODO Should this include an entry for pkixParams.GetAdditionalStores() too?
}
catch (Exception e)
{
throw new PkixCertPathBuilderException(
"Error finding target certificate.", e);
}
if (targets.IsEmpty)
{
throw new PkixCertPathBuilderException("No certificate found matching targetContraints.");
}
PkixCertPathBuilderResult result = null;
IList certPathList = Platform.CreateArrayList();
// check all potential target certificates
foreach (X509Certificate cert in targets)
{
result = Build(cert, pkixParams, certPathList);
if (result != null)
{
break;
}
}
if (result == null && certPathException != null)
{
throw new PkixCertPathBuilderException(certPathException.Message, certPathException.InnerException);
}
if (result == null && certPathException == null)
{
throw new PkixCertPathBuilderException("Unable to find certificate chain.");
}
return(result);
}
/**
* Find the issuer certificates of a given certificate.
*
* @param cert
* The certificate for which an issuer should be found.
* @param pkixParams
* @return A <code>Collection</code> object containing the issuer
* <code>X509Certificate</code>s. Never <code>null</code>.
*
* @exception Exception
* if an error occurs.
*/
internal static ICollection FindIssuerCerts(
X509Certificate cert,
PkixBuilderParameters pkixParams)
{
X509CertStoreSelector certSelect = new X509CertStoreSelector();
ISet certs = new HashSet();
try
{
certSelect.Subject = cert.IssuerDN;
}
catch (IOException ex)
{
throw new Exception(
"Subject criteria for certificate selector to find issuer certificate could not be set.", ex);
}
try
{
certs.AddAll(PkixCertPathValidatorUtilities.FindCertificates(certSelect, pkixParams.GetStores()));
certs.AddAll(PkixCertPathValidatorUtilities.FindCertificates(certSelect, pkixParams.GetAdditionalStores()));
}
catch (Exception e)
{
throw new Exception("Issuer certificate cannot be searched.", e);
}
return(certs);
}
/**
* Build and validate a CertPath using the given parameter.
*
* @param params PKIXBuilderParameters object containing all information to
* build the CertPath
*/
public virtual PkixCertPathBuilderResult Build(
PkixBuilderParameters pkixParams)
{
// search target certificates
IX509Selector certSelect = pkixParams.GetTargetConstraints();
if (!(certSelect is X509AttrCertStoreSelector))
{
throw new PkixCertPathBuilderException(
"TargetConstraints must be an instance of "
+ typeof(X509AttrCertStoreSelector).FullName
+ " for "
+ typeof(PkixAttrCertPathBuilder).FullName + " class.");
}
ICollection targets;
try
{
targets = PkixCertPathValidatorUtilities.FindCertificates(
(X509AttrCertStoreSelector)certSelect, pkixParams.GetStores());
}
catch (Exception e)
{
throw new PkixCertPathBuilderException("Error finding target attribute certificate.", e);
}
if (targets.Count == 0)
{
throw new PkixCertPathBuilderException(
"No attribute certificate found matching targetContraints.");
}
PkixCertPathBuilderResult result = null;
// check all potential target certificates
foreach (IX509AttributeCertificate cert in targets)
{
X509CertStoreSelector selector = new X509CertStoreSelector();
X509Name[] principals = cert.Issuer.GetPrincipals();
ISet issuers = new HashSet();
for (int i = 0; i < principals.Length; i++)
{
try
{
selector.Subject = principals[i];
issuers.AddAll(PkixCertPathValidatorUtilities.FindCertificates(selector, pkixParams.GetStores()));
}
catch (Exception e)
{
throw new PkixCertPathBuilderException(
"Public key certificate for attribute certificate cannot be searched.",
e);
}
}
if (issuers.IsEmpty)
{
throw new PkixCertPathBuilderException("Public key certificate for attribute certificate cannot be found.");
}
IList certPathList = Platform.CreateArrayList();
foreach (X509Certificate issuer in issuers)
{
result = Build(cert, issuer, pkixParams, certPathList);
if (result != null)
{
break;
}
}
if (result != null)
{
break;
}
}
if (result == null && certPathException != null)
{
throw new PkixCertPathBuilderException(
"Possible certificate chain could not be validated.",
certPathException);
}
if (result == null && certPathException == null)
{
throw new PkixCertPathBuilderException(
"Unable to find certificate chain.");
}
return(result);
}