Function esp_idf_sys::mbedtls_cipher_set_iv

pub unsafe extern "C" fn mbedtls_cipher_set_iv(
    ctx: *mut mbedtls_cipher_context_t,
    iv: *const c_uchar,
    iv_len: usize
) -> c_int

\brief This function sets the initialization vector (IV) or nonce.

\note Some ciphers do not use IVs nor nonce. For these ciphers, this function has no effect.

\note For #MBEDTLS_CIPHER_CHACHA20, the nonce length must be 12, and the initial counter value is 0.

\note For #MBEDTLS_CIPHER_CHACHA20_POLY1305, the nonce length must be 12.

\param ctx The generic cipher context. This must be initialized and bound to a cipher information structure. \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers. This must be a readable buffer of at least \p iv_len Bytes. \param iv_len The IV length for ciphers with variable-size IV. This parameter is discarded by ciphers with fixed-size IV.

\return \c 0 on success. \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.