@Override
  public int nonceSizeInBytes() {
    return 12;
  }
A stream cipher, as described in RFC 8439 https://tools.ietf.org/html/rfc8439, section 2.4.

<p>This cipher is meant to be used to construct an AEAD with Poly1305.
java_src/src/main/java/com/google/crypto/tink/aead/internal/InsecureNonceChaCha20.java