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Improve documentation about PSK configuration

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Signed-off-by: Guilhem Bryant <Guilhem.Bryant@arm.com>
This commit is contained in:
Guilhem Bryant 2020-03-25 16:57:00 +00:00
parent d414c32a16
commit e40a2f7a99
1 changed files with 21 additions and 3 deletions
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24
include/mbedtls/ssl.h
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@ -2682,6 +2682,9 @@ int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf,
* \note This is mainly useful for clients. Servers will usually * \note This is mainly useful for clients. Servers will usually
* want to use \c mbedtls_ssl_conf_psk_cb() instead. * want to use \c mbedtls_ssl_conf_psk_cb() instead.
* *
* \note A PSK set by \c mbedtls_ssl_set_hs_psk() in the PSK callback
* takes precedence over a PSK configured by this function.
*
* \warning Currently, clients can only register a single pre-shared key. * \warning Currently, clients can only register a single pre-shared key.
* Calling this function or mbedtls_ssl_conf_psk_opaque() more * Calling this function or mbedtls_ssl_conf_psk_opaque() more
* than once will overwrite values configured in previous calls. * than once will overwrite values configured in previous calls.
@ -2715,6 +2718,10 @@ int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
* \note This is mainly useful for clients. Servers will usually * \note This is mainly useful for clients. Servers will usually
* want to use \c mbedtls_ssl_conf_psk_cb() instead. * want to use \c mbedtls_ssl_conf_psk_cb() instead.
* *
* \note An opaque PSK set by \c mbedtls_ssl_set_hs_psk_opaque() in
* the PSK callback takes precedence over an opaque PSK
* configured by this function.
*
* \warning Currently, clients can only register a single pre-shared key. * \warning Currently, clients can only register a single pre-shared key.
* Calling this function or mbedtls_ssl_conf_psk() more than * Calling this function or mbedtls_ssl_conf_psk() more than
* once will overwrite values configured in previous calls. * once will overwrite values configured in previous calls.
@ -2752,6 +2759,9 @@ int mbedtls_ssl_conf_psk_opaque( mbedtls_ssl_config *conf,
* \note This should only be called inside the PSK callback, * \note This should only be called inside the PSK callback,
* i.e. the function passed to \c mbedtls_ssl_conf_psk_cb(). * i.e. the function passed to \c mbedtls_ssl_conf_psk_cb().
* *
* \note A PSK set by this function takes precedence over a PSK
* configured by \c mbedtls_ssl_conf_psk().
*
* \param ssl The SSL context to configure a PSK for. * \param ssl The SSL context to configure a PSK for.
* \param psk The pointer to the pre-shared key. * \param psk The pointer to the pre-shared key.
* \param psk_len The length of the pre-shared key in bytes. * \param psk_len The length of the pre-shared key in bytes.
@ -2769,6 +2779,9 @@ int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
* \note This should only be called inside the PSK callback, * \note This should only be called inside the PSK callback,
* i.e. the function passed to \c mbedtls_ssl_conf_psk_cb(). * i.e. the function passed to \c mbedtls_ssl_conf_psk_cb().
* *
* \note An opaque PSK set by this function takes precedence over an
* opaque PSK configured by \c mbedtls_ssl_conf_psk_opaque().
*
* \param ssl The SSL context to configure a PSK for. * \param ssl The SSL context to configure a PSK for.
* \param psk The identifier of the key slot holding the PSK. * \param psk The identifier of the key slot holding the PSK.
* For the duration of the current handshake, the key slot * For the duration of the current handshake, the key slot
@ -2807,9 +2820,14 @@ int mbedtls_ssl_set_hs_psk_opaque( mbedtls_ssl_context *ssl,
* on the SSL context to set the correct PSK and return \c 0. * on the SSL context to set the correct PSK and return \c 0.
* Any other return value will result in a denied PSK identity. * Any other return value will result in a denied PSK identity.
* *
* \note If you set a PSK callback using this function, then you * \note A dynamic PSK (i.e. set by the PSK callback) takes
* don't need to set a PSK key and identity using * precedence over a static PSK (i.e. set by
* \c mbedtls_ssl_conf_psk(). * \c mbedtls_ssl_conf_psk() or
* \c mbedtls_ssl_conf_psk_opaque()).
* This means that if you set a PSK callback using this
* function, you don't need to set a PSK using
* \c mbedtls_ssl_conf_psk() or
* \c mbedtls_ssl_conf_psk_opaque()).
* *
* \param conf The SSL configuration to register the callback with. * \param conf The SSL configuration to register the callback with.
* \param f_psk The callback for selecting and setting the PSK based * \param f_psk The callback for selecting and setting the PSK based