Rename psa_crypto_random.h to psa_crypto_random_impl.h

Make it clear that this is an abstraction of the random generator
abstraction, and not an abstraction of the PSA random generator.

mbedtls_psa_get_random and MBEDTLS_PSA_RANDOM_STATE are public-facing
definitions and will be moved in a subsequent commit.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 288e071..79b0633 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -40,7 +40,7 @@
  * stored keys. */
 #include "psa_crypto_storage.h"
 
-#include "psa_crypto_random.h"
+#include "psa_crypto_random_impl.h"
 
 #include <assert.h>
 #include <stdlib.h>
@@ -6415,7 +6415,7 @@
 
 /* Wrapper function allowing the classic API to use the PSA RNG.
  * In the non-external case, mbedtls_psa_get_random is defined
- * as a constant function pointer in psa_crypto_random.h.
+ * as a constant function pointer in psa_crypto_random_impl.h.
  */
 #if defined (MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
 int mbedtls_psa_get_random( void *p_rng,
diff --git a/library/psa_crypto_random.h b/library/psa_crypto_random_impl.h
similarity index 96%
rename from library/psa_crypto_random.h
rename to library/psa_crypto_random_impl.h
index 2482d6b..6b445c6 100644
--- a/library/psa_crypto_random.h
+++ b/library/psa_crypto_random_impl.h
@@ -1,6 +1,6 @@
-/** \file psa_crypto_random.h
+/** \file psa_crypto_random_impl.h
  *
- * \brief PSA crypto random generator abstraction.
+ * \brief PSA crypto random generator implementation abstraction.
  */
 /*
  *  Copyright The Mbed TLS Contributors
@@ -19,8 +19,8 @@
  *  limitations under the License.
  */
 
-#ifndef PSA_CRYPTO_RANDOM_H
-#define PSA_CRYPTO_RANDOM_H
+#ifndef PSA_CRYPTO_RANDOM_IMPL_H
+#define PSA_CRYPTO_RANDOM_IMPL_H
 
 #if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
 
@@ -205,4 +205,4 @@
 
 #endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
 
-#endif /* PSA_CRYPTO_RANDOM_H */
+#endif /* PSA_CRYPTO_RANDOM_IMPL_H */