} else {
            inver = InvertibleCryptographer.createAesCipher(fessConfig.getAppCipherKey());
        }

        final OneWayCryptographer oneWay;
        final String digestAlgorithm = fessConfig.getAppDigestAlgorithm();
        if ("sha512".equalsIgnoreCase(digestAlgorithm)) {
            oneWay = OneWayCryptographer.createSha512Cryptographer();
        } else if ("md5".equalsIgnoreCase(digestAlgorithm)) {

     * The value is, e.g. sha256 <br>
     * comment: Algorithm for digest calculation.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getAppDigestAlgorithm();

    /**
     * Get the value for the key 'app.encrypt.property.pattern'. <br>
     * The value is, e.g. .*password|.*key|.*token|.*secret <br>
     * comment: Regex pattern for properties to encrypt.