Show SHA-256 thumbprint of certificate instead of MD5

Also formats hex-output in a monospaced font and wraps it.

Closes #173

src/net/java/sip/communicator/plugin/desktoputil/X509CertificatePanel.java

@@ -288,11 +288,11 @@ private void renderX509(StringBuilder sb, X509Certificate certificate)
         addTitle(sb, R.getI18NString("service.gui.CERT_INFO_FINGERPRINTS"));
         try
         {
+            String sha256String = getThumbprint(certificate, "SHA-256");
             String sha1String = getThumbprint(certificate, "SHA1");
-            String md5String = getThumbprint(certificate, "MD5");
 
-            addField(sb, "SHA1:", sha1String);
-            addField(sb, "MD5:", md5String);
+            addField(sb, "SHA256:", sha256String, 48);
+            addField(sb, "SHA1:", sha1String, 32);
         }
         catch (CertificateException e)
         {
@@ -346,11 +346,12 @@ else if(certificate.getPublicKey().getAlgorithm().equals("DSA"))
 
         addField(sb, R.getI18NString("service.gui.CERT_INFO_SIGN"),
             R.getI18NString(
-                    "service.gui.CERT_INFO_KEY_BYTES_PRINT",
+                    "service.gui.CERT_INFO_KEY_BITS_PRINT",
                     new String[]{
-                        String.valueOf(certificate.getSignature().length),
-                        getHex(certificate.getSignature())
+                        String.valueOf(certificate.getSignature().length*8),
                     }));
+        addField(sb, R.getI18NString("service.gui.CERT_INFO_SIGN"),
+            getHex(certificate.getSignature()), 48);
 
         sb.append("</table>\n");
     }
@@ -376,12 +377,43 @@ private void addTitle(StringBuilder sb, String title)
      */
     private void addField(StringBuilder sb, String field, String value)
     {
-        sb.append("<tr>")
-                .append("<td style='margin-left: 5pt; margin-right: 25pt;")
-                .append(" white-space: nowrap'>")
-                .append(field).append("</td>")
-                .append("<td>").append(value).append("</td>")
-                .append("</tr>\n");
+        addField(sb, field, value, 0);
+    }
+
+    /**
+     * Add a field.
+     * @param sb StringBuilder to append to
+     * @param field name of the certificate field
+     * @param value to print
+     * @param wrap force-wrap after number of characters
+     */
+    private void addField(StringBuilder sb, String field, String value,
+        int wrap)
+    {
+        sb.append("<tr><td style='margin-left: 5pt; margin-right: 25pt;")
+            .append("white-space: nowrap' valign='top'>")
+            .append(field).append("</td><td");
+
+        if (wrap > 0)
+        {
+            sb.append(" style='font-family:monospace'>");
+            for (int i = 0; i < value.length(); i++)
+            {
+                if (i % wrap == 0 && i > 0)
+                {
+                    sb.append("\n");
+                }
+
+                sb.append(value.charAt(i));
+            }
+        }
+        else
+        {
+            sb.append(">");
+            sb.append(value);
+        }
+
+        sb.append("</td></tr>\n");
     }
 
     /**
@@ -399,13 +431,13 @@ private String getHex( byte [] raw )
         try
         {
             for (byte b : raw)
-                f.format("%02x", b);
+                f.format("%02X:", b);
         }
         finally
         {
             f.close();
         }
-        return hex.toString();
+        return hex.substring(0, hex.length() - 1);
     }
 
     /**
@@ -429,19 +461,21 @@ private static String getThumbprint(X509Certificate cert, String algorithm)
         {
             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);
+                f.format("%02X:", b);
         }
         finally
         {
             f.close();
         }
-        return sb.toString();
+
+        return sb.substring(0, sb.length() - 1);
     }
 
     /**