@Override
  InsecureNonceChaCha20Base newChaCha20Instance(final byte[] key, int initialCounter)
      throws InvalidKeyException {
    return new InsecureNonceChaCha20(key, initialCounter);
  }
ChaCha20Poly1305 AEAD construction, as described in <a
href="https://tools.ietf.org/html/rfc8439#section-2.8">RFC 8439, section 2.8</a>.

@since 1.1.0
java_src/src/main/java/com/google/crypto/tink/aead/internal/InsecureNonceChaCha20Poly1305.java