public static PrivateKey getPrivateKey()

in aws-iot-device-sdk-java-samples/src/main/java/com/amazonaws/services/iot/client/sample/sampleUtil/PrivateKeyReader.java [106:141]

34 lines of code
9 McCabe index (conditional complexity)


    public static PrivateKey getPrivateKey(InputStream stream, String algorithm) throws IOException,
            GeneralSecurityException {
        PrivateKey key = null;
        boolean isRSAKey = false;

        BufferedReader br = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
        StringBuilder builder = new StringBuilder();
        boolean inKey = false;
        for (String line = br.readLine(); line != null; line = br.readLine()) {
            if (!inKey) {
                if (line.startsWith("-----BEGIN ") && line.endsWith(" PRIVATE KEY-----")) {
                    inKey = true;
                    isRSAKey = line.contains("RSA");
                }
                continue;
            } else {
                if (line.startsWith("-----END ") && line.endsWith(" PRIVATE KEY-----")) {
                    inKey = false;
                    isRSAKey = line.contains("RSA");
                    break;
                }
                builder.append(line);
            }
        }
        KeySpec keySpec = null;
        byte[] encoded = Base64.decodeBase64(builder.toString());
        if (isRSAKey) {
            keySpec = getRSAKeySpec(encoded);
        } else {
            keySpec = new PKCS8EncodedKeySpec(encoded);
        }
        KeyFactory kf = KeyFactory.getInstance((algorithm == null) ? "RSA" : algorithm);
        key = kf.generatePrivate(keySpec);

        return key;
    }