示例#1
0
 /**
  * Sets the algorithm used for computing the digest.
  *
  * @param alg the algorithm name
  */
 public void setAlgorithm(String alg) {
   try {
     currentAlgorithm = MessageDigest.getInstance(alg);
     digest.setText("");
   } catch (NoSuchAlgorithmException e) {
     digest.setText("" + e);
   }
 }
 /**
  * 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();
 }