Function libsignal_protocol::sealed_sender_encrypt

pub async fn sealed_sender_encrypt<R: Rng + CryptoRng>(
    destination: &ProtocolAddress,
    sender_cert: &SenderCertificate,
    ptext: &[u8],
    session_store: &mut dyn SessionStore,
    identity_store: &mut dyn IdentityKeyStore,
    now: SystemTime,
    rng: &mut R,
) -> Result<Vec<u8>>

Encrypt the plaintext message ptext, generate an UnidentifiedSenderMessageContent, then pass the result to sealed_sender_encrypt_from_usmc.

This is a simple way to encrypt a message in a 1:1 using Sealed Sender v1.