From debbea384326631fb16053c34ce85a53df348c6a Mon Sep 17 00:00:00 2001
From: Hideki Miyazaki <hide@wolfssl.com>
Date: Sat, 10 Aug 2024 06:45:18 +0900
Subject: [PATCH] put back the RNG

comment to CUSTOM RAND GENERATE BLOCK
---
 .../RX72N/EnvisionKit/wolfssl_demo/user_settings.h   | 10 ++++++++--
 wolfcrypt/src/random.c                               | 12 ++++++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/IDE/Renesas/e2studio/RX72N/EnvisionKit/wolfssl_demo/user_settings.h b/IDE/Renesas/e2studio/RX72N/EnvisionKit/wolfssl_demo/user_settings.h
index e79fe041a..e9199f02b 100644
--- a/IDE/Renesas/e2studio/RX72N/EnvisionKit/wolfssl_demo/user_settings.h
+++ b/IDE/Renesas/e2studio/RX72N/EnvisionKit/wolfssl_demo/user_settings.h
@@ -259,7 +259,14 @@
         # undef WOLFSSL_RENESAS_TSIP_TLS
         # undef WOLFSSL_RENESAS_TSIP_CRYPT
     #endif
-
+    /*-------------------------------------------------------------------------
+     * TSIP generates random numbers using the CRT-DRBG described
+     * in NIST SP800-90A. Recommend to define the CUSTOM_RAND_GENERATE_BLOCK
+     * so that wc_RNG_GenerateByte/Block() call TSIP random generatoion API
+     * directly. Comment out the macro will generate random number by
+     * wolfSSL Hash DRBG by using a seed which is generated by TSIP API.
+     *-----------------------------------------------------------------------*/
+	#define CUSTOM_RAND_GENERATE_BLOCK wc_tsip_GenerateRandBlock
 #else
     #define OPENSSL_EXTRA
     #define WOLFSSL_GENSEED_FORTEST /* Warning: define your own seed gen */
@@ -279,6 +286,5 @@
 /*-- strcasecmp */
 #define XSTRCASECMP(s1,s2) strcmp((s1),(s2))
 
-#define CUSTOM_RAND_GENERATE_BLOCK wc_tsip_GenerateRandBlock
 /* use original ASN parsing */
 #define WOLFSSL_ASN_ORIGINAL
diff --git a/wolfcrypt/src/random.c b/wolfcrypt/src/random.c
index ef4713de6..822f069f7 100644
--- a/wolfcrypt/src/random.c
+++ b/wolfcrypt/src/random.c
@@ -126,6 +126,9 @@ This library contains implementation for the random number generator.
 #elif defined(WOLFSSL_PB)
 #elif defined(WOLFSSL_ZEPHYR)
 #elif defined(WOLFSSL_TELIT_M2MB)
+#elif defined(WOLFSSL_RENESAS_TSIP)
+    /* for wc_tsip_GenerateRandBlock */
+    #include "wolfssl/wolfcrypt/port/Renesas/renesas-tsip-crypt.h"
 #elif defined(WOLFSSL_SCE) && !defined(WOLFSSL_SCE_NO_TRNG)
 #elif defined(WOLFSSL_IMXRT1170_CAAM)
 #elif defined(CY_USING_HAL) && defined(COMPONENT_WOLFSSL)
@@ -3652,6 +3655,15 @@ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
         return 0;
     }
 
+#elif defined(WOLFSSL_RENESAS_TSIP)
+
+    int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+    {
+        (void)os;
+        return wc_tsip_GenerateRandBlock(output, sz);
+    }
+
+
 #elif defined(WOLFSSL_SCE) && !defined(WOLFSSL_SCE_NO_TRNG)
     #include "hal_data.h"