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Security infrastructure used in greetgo!

There is a newer version: 0.0.12

package kz.greetgo.security.util;

import java.util.Base64;

public class Base64Util {
  private static final char slash = '$';
  private static final char equal = '_';
  private static final char plus = '.';

  public static byte[] base64ToBytes(String base64) {
    if (base64 == null) {
      return null;
    }
    try {
      String base64Restored = restoreUnsafeCharacters(base64);
      final byte[] ret = Base64.getDecoder().decode(base64Restored);
      if (ret == null) {
        return null;
      }
      if (ret.length == 0) {
        return null;
      }
      return ret;
    } catch (Exception e) {
      return null;
    }
  }

  public static String bytesToBase64(byte[] bytes) {
    if (bytes == null) {
      return null;
    }
    String result = Base64.getEncoder().encodeToString(bytes);
    return escapeUnsafeCharacters(result);
  }

  private static String escapeUnsafeCharacters(String result) {
    return result
      .replace('/', slash)
      .replace('=', equal)
      .replace('+', plus);
  }

  private static String restoreUnsafeCharacters(String result) {
    return result
      .replace(slash, '/')
      .replace(equal, '=')
      .replace(plus, '+');
  }
}