validcertpath.html

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<TITLE>Validating a Certification Path
(Java Developers Almanac Example)
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    <B><A HREF="../java.security.cert/pkg.html">java.security.cert</A></B><font color="#666666" SIZE="-2">
        &nbsp;[9 examples]
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        <B><A HREF="../java.security.cert/pkg.html#Certification%20Paths">Certification Paths</A></B><font color="#666666" SIZE="-2">
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  <h3>
    e231.  
    Validating a Certification Path</h3>

This example validates a chain of certificates using the most-trusted CAs
in the JDK's <code>cacerts</code> file.


<pre>
    try {
        // Load the JDK's cacerts keystore file
        String filename = System.getProperty("java.home")
            + "/lib/security/cacerts".replace('/', File.separatorChar);
        FileInputStream is = new FileInputStream(filename);
        KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
        String password = <font color="#0066ff"><i>"changeit"</i></font>;
        keystore.load(is, password.toCharArray());
    
        // Create the parameters for the validator
        PKIXParameters params = new PKIXParameters(keystore);
    
        // Disable CRL checking since we are not supplying any CRLs
        params.setRevocationEnabled(false);
    
        // Create the validator and validate the path
        // To create a path, see <a href="../java.security.cert/CreateCertPath.html" class="eglink"><font size="-1"><b>e229</b> Creating a Certification Path</font></a>
        CertPathValidator certPathValidator
            = CertPathValidator.getInstance(CertPathValidator.getDefaultType());
        CertPathValidatorResult result = certPathValidator.validate(<font color="#0066ff"><i>certPath</i></font>, params);
    
        // Get the CA used to validate this path
        PKIXCertPathValidatorResult pkixResult = (PKIXCertPathValidatorResult)result;
        TrustAnchor ta = pkixResult.getTrustAnchor();
        X509Certificate cert = ta.getTrustedCert();
    } catch (CertificateException e) {
    } catch (KeyStoreException e) {
    } catch (NoSuchAlgorithmException e) {
    } catch (InvalidAlgorithmParameterException e) {
    } catch (CertPathValidatorException e) {
        // Validation failed
    }
</pre>
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            &nbsp;Related Examples
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e228. <a class="eglink" href="ListCertValid.html?l=rel">
    Listing All Available Certification Path Validation Algorithms
</a>
<br>

e229. <a class="eglink" href="CreateCertPath.html?l=rel">
    Creating a Certification Path
</a>
<br>

e230. <a class="eglink" href="ListTrustAnchors.html?l=rel">
    Listing the Most-Trusted Certificate Authorities (CA) in a Key Store
</a>
<br>


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        See also: 
<a class="eglink" href="/egs/java.security.cert/pkg.html?l=rel#Certificates">
    Certificates
</a>&nbsp;&nbsp;

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