Fix mcxn build by providing the RNG for TZ_PSA builds

Author: AlexLanzano

test-app/Makefile

@@ -16,7 +16,9 @@ TARGET?=none
 ARCH?=ARM
 MCUXPRESSO_CMSIS?=$(MCUXPRESSO)/CMSIS
 ifneq (,$(filter $(TARGET),mcxa mcxw mcxn))
-  TEST_APP_NO_RNG?=1
+  ifneq ($(WOLFCRYPT_TZ_PSA),1)
+    TEST_APP_NO_RNG?=1
+  endif
 endif
 ifeq ($(TZEN),1)
   # wcs directory contains a user_settings.h, which will conflict with

test-app/wcs/user_settings.h

@@ -166,6 +166,20 @@ static inline int wcs_cmse_get_random(unsigned char* output, int sz)
 #define CUSTOM_RAND_GENERATE_BLOCK wcs_cmse_get_random
 #endif
 
+#ifdef WOLFCRYPT_TZ_PSA
+
+extern int hal_trng_get_entropy(unsigned char *out, unsigned int len);
+
+static inline int wcs_psa_rand_block(unsigned char *output, int sz)
+{
+    if (hal_trng_get_entropy(output, (unsigned int)sz) != 0)
+        return -1;
+    return 0;
+}
+
+#define CUSTOM_RAND_GENERATE_BLOCK wcs_psa_rand_block
+#endif
+
 /* Disable VLAs */
 #define WOLFSSL_SP_NO_DYN_STACK