public byte[] decrypt(final byte[] nonce, final byte[] ciphertext)
      throws GeneralSecurityException {
    return decrypt(nonce, ByteBuffer.wrap(ciphertext));
  }
Decrypts {@code ciphertext} using {@code nonce}.
java_src/src/main/java/com/google/crypto/tink/aead/internal/InsecureNonceChaCha20Base.java