Function group_cipher_encrypt 

pub unsafe extern "C" fn group_cipher_encrypt(
    cipher: *mut group_cipher,
    padded_plaintext: *const u8,
    padded_plaintext_len: usize,
    encrypted_message: *mut *mut ciphertext_message,
) -> c_int

Encrypt a message.

@param padded_plaintext The plaintext message bytes, optionally padded to a constant multiple. @param padded_plaintext_len The length of the data pointed to by padded_message @param encrypted_message Set to a ciphertext message encrypted to the group+sender+device tuple.

@retval SG_SUCCESS Success @retval SG_ERR_NO_SESSION if there is no established session for this contact. @retval SG_ERR_INVALID_KEY if there is no valid private key for this session.