Function esp_idf_svc::sys::mbedtls_ccm_starts

pub unsafe extern "C" fn mbedtls_ccm_starts(
    ctx: *mut mbedtls_ccm_context,
    mode: i32,
    iv: *const u8,
    iv_len: usize,
) -> i32

\brief This function starts a CCM encryption or decryption operation.

             This function and mbedtls_ccm_set_lengths() must be called
             before calling mbedtls_ccm_update_ad() or
             mbedtls_ccm_update(). This function can be called before
             or after mbedtls_ccm_set_lengths().

\note This function is not implemented in Mbed TLS yet.

\param ctx The CCM context. This must be initialized. \param mode The operation to perform: #MBEDTLS_CCM_ENCRYPT or #MBEDTLS_CCM_DECRYPT or #MBEDTLS_CCM_STAR_ENCRYPT or #MBEDTLS_CCM_STAR_DECRYPT. \param iv The initialization vector. This must be a readable buffer of at least \p iv_len Bytes. \param iv_len The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12, or 13. The length L of the message length field is 15 - \p iv_len.

\return \c 0 on success. \return #MBEDTLS_ERR_CCM_BAD_INPUT on failure: \p ctx is in an invalid state, \p mode is invalid, \p iv_len is invalid (lower than \c 7 or greater than \c 13).