问Java简单加密

EN

import org.apache.commons.codec.binary.Base64;
public class Cipher {
  private static final String KEY = "some-secret-key-of-your-choice";
  public String encrypt(final String text) {
    return Base64.encodeBase64String(this.xor(text.getBytes()));
  }
  public String decrypt(final String hash) {
    try {
      return new String(this.xor(Base64.decodeBase64(hash.getBytes())), "UTF-8");
    } catch (java.io.UnsupportedEncodingException ex) {
      throw new IllegalStateException(ex);
    }
  }
  private byte[] xor(final byte[] input) {
    final byte[] output = new byte[input.length];
    final byte[] secret = this.KEY.getBytes();
    int spos = 0;
    for (int pos = 0; pos < input.length; ++pos) {
      output[pos] = (byte) (input[pos] ^ secret[spos]);
      spos += 1;
      if (spos >= secret.length) {
        spos = 0;
      }
    }
    return output;
  }