?? testcertificate.java
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package javasec.samples.ch09;import java.security.*;import java.security.cert.*;import java.io.*;public class TestCertificate { // Techniques to implement this method are shown in the next chapter. PublicKey getPublicKey(Principal p) { return null; } // Implementations of this method depend on the CA in use and are // left to the reader. InputStream lookupCRLFile(Principal p) { return null; } public java.security.cert.Certificate importCertificate(byte data[]) throws CertificateException { X509Certificate c = null; try { CertificateFactory cf = CertificateFactory.getInstance("X509"); ByteArrayInputStream bais = new ByteArrayInputStream(data); c = (X509Certificate) cf.generateCertificate(bais); Principal p = c.getIssuerDN(); PublicKey pk = getPublicKey(p); c.verify(pk); InputStream crlFile = lookupCRLFile(p); cf = CertificateFactory.getInstance("X509CRL"); X509CRL crl = (X509CRL) cf.generateCRL(crlFile); if (crl.isRevoked(c)) throw new CertificateException("Certificate revoked"); } catch (NoSuchAlgorithmException nsae) { throw new CertificateException("Can't verify certificate"); } catch (NoSuchProviderException nspe) { throw new CertificateException("Can't verify certificate"); } catch (SignatureException se) { throw new CertificateException("Can't verify certificate"); } catch (InvalidKeyException ike) { throw new CertificateException("Can't verify certificate"); } catch (CRLException ce) { // treat as no crl } return c; }}
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