public static ChaCha20Poly1305Parameters create() {
    return new ChaCha20Poly1305Parameters(Variant.NO_PREFIX);
  }
Describes how the prefix is computed. For AEAD there are three main possibilities: NO_PREFIX
(empty prefix), TINK (prefix the ciphertext with 0x01 followed by a 4-byte key id in big endian
format) or CRUNCHY (prefix the ciphertext with 0x00 followed by a 4-byte key id in big endian
format)
java_src/src/main/java/com/google/crypto/tink/aead/ChaCha20Poly1305Parameters.java