Method getCiphers

app/src/main/java/eu/faircode/email/Log.java:1802–1887

()

    }

    static SpannableStringBuilder getCiphers() {
        SpannableStringBuilder ssb = new SpannableStringBuilderEx();

        for (Provider provider : new Provider[]{
                null, // Android
                new BouncyCastleJsseProvider(),
                new BouncyCastleJsseProvider(true)})
            for (String protocol : new String[]{"SSL", "TLS"})
                try {
                    int begin = ssb.length();

                    SSLContext sslContext = (provider == null
                            ? SSLContext.getInstance(protocol)
                            : SSLContext.getInstance(protocol, provider));

                    ssb.append("SSL protocol: ").append(sslContext.getProtocol()).append("\r\n");
                    Provider sslProvider = sslContext.getProvider();
                    ssb.append("SSL provider: ").append(sslProvider.getName());
                    if (sslProvider instanceof BouncyCastleJsseProvider) {
                        boolean fips = ((BouncyCastleJsseProvider) sslProvider).isFipsMode();
                        if (fips)
                            ssb.append(" FIPS");
                    }
                    ssb.append("\r\n");
                    ssb.append("SSL class: ").append(sslProvider.getClass().getName()).append("\r\n");

                    ssb.setSpan(new StyleSpan(Typeface.BOLD), begin, ssb.length(), 0);
                    ssb.append("\r\n");

                    TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
                    tmf.init((KeyStore) null);

                    ssb.append("Trust provider: ").append(tmf.getProvider().getName()).append("\r\n");
                    ssb.append("Trust class: ").append(tmf.getProvider().getClass().getName()).append("\r\n");
                    ssb.append("Trust algorithm: ").append(tmf.getAlgorithm()).append("\r\n");

                    TrustManager[] tms = tmf.getTrustManagers();
                    if (tms != null)
                        for (TrustManager tm : tms)
                            ssb.append("Trust manager: ").append(tm.getClass().getName()).append("\r\n");
                    ssb.append("\r\n");

                    sslContext.init(null, tmf.getTrustManagers(), null);
                    SSLSocket socket = (SSLSocket) sslContext.getSocketFactory().createSocket();

                    List<String> protocols = new ArrayList<>();
                    protocols.addAll(Arrays.asList(socket.getEnabledProtocols()));

                    for (String p : socket.getSupportedProtocols()) {
                        boolean enabled = protocols.contains(p);
                        if (!enabled)
                            ssb.append('(');
                        int start = ssb.length();
                        ssb.append(p);
                        if (!enabled) {
                            ssb.setSpan(new StrikethroughSpan(), start, ssb.length(), 0);
                            ssb.append(')');
                        }