Function crypto_kem_xwing_dec 

pub fn crypto_kem_xwing_dec(
    shared_secret: &mut SharedSecret,
    ciphertext: &Ciphertext,
    secret_key: &SecretKey,
) -> Result<(), Error>

Recovers the shared secret encapsulated in ciphertext with secret_key, writing it to shared_secret. A ciphertext not created for this key yields an unrelated pseudorandom secret, not an error.

Compatible with libsodium’s crypto_kem_xwing_dec.

Errors

Returns Error::InvalidKey if the X25519 part of ciphertext is a low-order point that gives an all-zero X25519 shared secret.