/**
* Calculates the hash of the certificate known as the "thumbprint" and returns it as a string
* representation.
*
* @param cert The certificate to hash.
* @param algorithm The hash algorithm to use.
* @return The SHA-1 hash of the certificate.
* @throws CertificateException
*/
private static String getThumbprint(X509Certificate cert, String algorithm)
throws CertificateException {
MessageDigest digest;
try {
digest = MessageDigest.getInstance(algorithm);
} catch (NoSuchAlgorithmException e) {
throw new CertificateException(e);
}
byte[] encodedCert = cert.getEncoded();
StringBuilder sb = new StringBuilder(encodedCert.length * 2);
Formatter f = new Formatter(sb);
try {
for (byte b : digest.digest(encodedCert)) f.format("%02x", b);
} finally {
f.close();
}
return sb.toString();
}
public static void main(String[] args) throws Exception {
Provider p = new com.sun.exp.provider.EXP();
Security.insertProviderAt(p, 1);
Object[] signers = p.getClass().getSigners();
if (signers == null || signers.length <= 0) {
throw new SecurityException("Test Failed");
} else {
for (int i = 0; i < signers.length; i++) {
System.out.println("signer [" + i + "] = " + signers[i]);
}
}
MessageDigest md = MessageDigest.getInstance("SHA1");
System.out.println("test passed");
}