package org.bouncycastle.jce; import java.io.*; import java.security.cert.*; import org.bouncycastle.asn1.*; import org.bouncycastle.asn1.x509.*; /** * a utility class that will extract X509Principal objects from X.509 certificates. */ public class PrincipalUtil { /** * return the issuer of the given cert as an X509PrincipalObject. */ public static X509Principal getIssuerX509Principal( X509Certificate cert) throws CertificateEncodingException { try { ByteArrayInputStream bIn = new ByteArrayInputStream( cert.getTBSCertificate()); ASN1InputStream aIn = new ASN1InputStream(bIn); TBSCertificateStructure tbsCert = new TBSCertificateStructure( (ASN1Sequence)aIn.readObject()); return new X509Principal(tbsCert.getIssuer()); } catch (IOException e) { throw new CertificateEncodingException(e.toString()); } } /** * return the subject of the given cert as an X509PrincipalObject. */ public static X509Principal getSubjectX509Principal( X509Certificate cert) throws CertificateEncodingException { try { ByteArrayInputStream bIn = new ByteArrayInputStream( cert.getTBSCertificate()); ASN1InputStream aIn = new ASN1InputStream(bIn); TBSCertificateStructure tbsCert = new TBSCertificateStructure( (ASN1Sequence)aIn.readObject()); return new X509Principal(tbsCert.getSubject()); } catch (IOException e) { throw new CertificateEncodingException(e.toString()); } } /** * return the issuer of the given CRL as an X509PrincipalObject. */ public static X509Principal getIssuerX509Principal( X509CRL crl) throws CRLException { try { ByteArrayInputStream bIn = new ByteArrayInputStream( crl.getTBSCertList()); ASN1InputStream aIn = new ASN1InputStream(bIn); TBSCertList tbsCertList = new TBSCertList( (ASN1Sequence)aIn.readObject()); return new X509Principal(tbsCertList.getIssuer()); } catch (IOException e) { throw new CRLException(e.toString()); } } }