psa: move definition of psa_can_do_hash() to crypto_extra.h

This allows any implementer of the PSA client interface to easily
include this header and therefore function's prototype.

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>

include/psa/crypto_extra.h

@@ -583,6 +583,32 @@ psa_status_t mbedtls_psa_platform_get_builtin_key(
 
 /** @} */
 
+/** \defgroup psa_crypto_client Functions defined by a client provider
+ *
+ * The functions in this group are meant to be implemented by providers of
+ * the PSA Crypto client interface. They are provided by the library when
+ * #MBEDTLS_PSA_CRYPTO_C is enabled.
+ *
+ * \note All functions in this group are experimental, as using
+ *       alternative client interface providers is experimental.
+ *
+ * @{
+ */
+
+/**
+ * Tell if PSA is ready for this hash.
+ *
+ * \note            For now, only checks the state of the driver subsystem,
+ *                  not the algorithm. Might do more in the future.
+ *
+ * \param hash_alg  The hash algorithm (ignored for now).
+ *
+ * \return 1 if the driver subsytem is ready, 0 otherwise.
+ */
+int psa_can_do_hash(psa_algorithm_t hash_alg);
+
+/**@}*/
+
 /** \addtogroup crypto_types
  * @{
  */

library/psa_crypto_core.h

@@ -24,18 +24,6 @@
 #include "mbedtls/threading.h"
 #endif
 
-/**
- * Tell if PSA is ready for this hash.
- *
- * \note            For now, only checks the state of the driver subsystem,
- *                  not the algorithm. Might do more in the future.
- *
- * \param hash_alg  The hash algorithm (ignored for now).
- *
- * \return 1 if the driver subsytem is ready, 0 otherwise.
- */
-int psa_can_do_hash(psa_algorithm_t hash_alg);
-
 /**
  * Tell if PSA is ready for this cipher.
  *