Function open 

pub fn open(
    ciphertext_b64: &str,
    recipient_priv: &RecipientPrivateKey,
) -> Result<Vec<u8>, SealedError>

Open a base64-encoded libsodium sealed-box ciphertext with recipient_priv.

Errors

Returns SealedError::Decode for malformed base64 input, or SealedError::Decrypt if the ciphertext fails authentication or is otherwise malformed.