@Override
  public String toString() {
    String s = "";
    s += "seqno: " + sequenceNumber + "\n";
    s += "pt: " + Hex.encode(plaintext) + "\n";
    s += "aad: " + Hex.encode(associatedData) + "\n";
    s += "nonce: " + Hex.encode(nonce) + "\n";
    s += "ct: " + Hex.encode(ciphertext);
    return s;
  }
Helper class that represents single encryption from an individual test vector.
java_src/src/main/java/com/google/crypto/tink/testing/HpkeTestEncryption.java