@Override
  public OutputStream createEncryptionStream(OutputStream out, Encryptor e) throws IOException {
    Preconditions.checkNotNull(e);
    return e.createEncryptionStream(out);
  }
AES-128, provided by the JCE
<p>
Algorithm instances are pooled for reuse, so the cipher provider and mode are configurable but
fixed at instantiation.
hbase-common/src/main/java/org/apache/hadoop/hbase/io/crypto/aes/AES.java