Add wolfCrypt sample on RH850 using CS+

Renesas/cs+/RH850/README.md

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+# wolfCrypt Examples on Renesas RH850
+
+This repository contains the Renesas RH850 examples.
+
+# Building wolfCrypt and sample code
+
+Before you begin, make sure you have the necessary tools and libraries installed.
+## Tools and Libraries
+| Tool/Library| Version| Description||
+|:--|:--|:--|:--|
+|Board||Renesas RH850/F1KM-S4||
+|Device||DR7F701649||
+|Toolchain|V2.06.00  [28 Nov 2023]|CC-RH RH850 Family Compiler||
+|IDE|V8.11.00 [30 Nov 2023]|CS+ for CC||
+|<a id="sw_package"></a> Software Package||[Y-ASK-RH850F1KM-S4-V3 Software Package](https://www.renesas.com/en/document/sws/y-ask-rh850f1km-s4-v3-software-package?r=1261056)||
+
+### Prepare boot.asm, cstart.asm and iodefine.h
+1. Open CS+
+2. Menu `File` -> `Create New Project`. Select `R7F01649`. Input `Dummy_Project` as project name. Click `Create` button.
+3. Copy `boot.asm`, `cstart.asm` and `iodefine.h` to `wolfssl-examples\Renesas\cs+\RH850\rsapss_sign_verify`
+
+### Prepare modules and peripherals by [Y-ASK-RH850F1KM-S4-V3 Software Package](https://www.renesas.com/en/document/sws/y-ask-rh850f1km-s4-v3-software-package?r=1261056)
+1. Download the package from [https://www.renesas.com/en/document/sws/y-ask-rh850f1km-s4-v3-software-package?r=1261056](https://www.renesas.com/en/document/sws/y-ask-rh850f1km-s4-v3-software-package?r=1261056)
+2. Unzip the package
+3. Copy the folder `Y-ASK-RH850F1KM-S4-V3_sample_V101\source\modules and peripherals` to the folder `<wolfssl-examples>\Renesas\cs+\RH850`
+4. Copy the folder `Y-ASK-RH850F1KM-S4-V3_sample_V101\device\r_typedefs.h, r_device.h, intVecNumF1KM.h and dr7f701649.dvf.h` to the folder `<wolfssl-examples>\Renesas\cs+\RH850`
+
+### Build RSA PSS Sign and Verify Sample
+1. Open [CS+](#DeviceFile) project file under `<wolfssl-examples>\Renesas\cs+\RH850\rsapss_sign_verify\rh850_rsapss_sign.mtpj`
+2. Modify `boot.asm`
+   2-1. Uncomment `USE_TABLE_REFERENCE_METHOD` so that the sample program is able to use table reference for interrupt
+   2-2. Change `section "EINTTBL", const` as follows:
+   ```
+   .section "EIINTTBL", const
+	.align	512
+	.offset (0x22*4)
+	.dw	#_INTRLIN30UR0
+	.offset (0x51*4)
+	.dw	#_INTTAUJ0I1
+	.offset (0x54*4)
+	.dw	#_INTCOSTM0
+	;.dw	#_Dummy_EI ; INT0
+	;.dw	#_Dummy_EI ; INT1
+	;.dw	#_Dummy_EI ; INT2
+	;.rept	512 - 0x54
+	;.dw	#_Dummy_EI ; INTn
+	;.endm
+    ```
+    2-3. Specify RAM addresses as follows:
+    ```
+    GLOBAL_RAM_ADDR	.set	0xFEEE8000
+	GLOBAL_RAM_END	.set	0xFEEE7FFF
+	LOCAL_RAM_ADDR	.set	0xFEBC0000
+    LOCAL_RAM_END	.set	0xFEBFFFFF
+    ```
+3. Modify `cstart.asm`
+   3-1. Change `STACKSIZE` from `0x200` to `0XA000`
+
+2. Build project, Menu `Build` -> `Build Project`
+3. Download the project to target device, `Debug` -> `Download...`
+
+The result can be observed through UART. Please connect to the cable to the board and open terminal with the following properties.
+
+|||
+|:-|:-|
+|baud rate | 9600|
+|data | 8|
+|parity | none|
+|stop bit | 1|
+|flow control | none|
+
+Example output
+```
+System Initializetion finish.
+RSA Sign and Verify Example
+Hashing message: This is the string to be signed
+Signing hash of message
+Hashing message: This is the string to be signed
+Verify hash of message
+RSA PSS verify success
+```

Renesas/cs+/RH850/rsapss_sign_verify/example_main.c

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+/* example_main.c
+ *
+ * Copyright (C) 2006-2025 wolfSSL Inc.
+ *
+ * This file is part of wolfSSL.
+ *
+ * wolfSSL is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * wolfSSL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
+ */
+#include <wolfssl/wolfcrypt/types.h>
+#include <wolfssl/wolfcrypt/aes.h>
+#include <wolfssl/wolfcrypt/cmac.h>
+#include "iodefine.h"
+#include "rh_string.h"
+#include "r_system.h"
+#include "r_intc.h"
+
+void R_LIN_Init(void);
+void R_UART_Init(void);
+void R_UART_SendString(char string[]);
+
+#define INTC2ICOSTM0 INTC2.ICOSTM0.UINT16
+
+#define MSG_LEN         128
+
+char    msg_buf[MSG_LEN + 1];
+size_t  msg_offset = 0;
+
+int rsapss_sign_verify();
+
+/* 1ms tick timer */
+static long tick = 0;
+#define NUMINTCOSTM0 0x54
+#pragma interrupt INTCOSTM0(enable=true, channel=NUMINTCOSTM0)
+void INTCOSTM0(void)
+{
+    tick++;
+}
+
+#define YEAR  ( \
+    ((__DATE__)[7]  - '0') * 1000 + \
+    ((__DATE__)[8]  - '0') * 100  + \
+    ((__DATE__)[9]  - '0') * 10   + \
+    ((__DATE__)[10] - '0') * 1      \
+)
+
+#define MONTH ( \
+    __DATE__[2] == 'n' ? (__DATE__[1] == 'a' ? 1 : 6) \
+  : __DATE__[2] == 'b' ? 2 \
+  : __DATE__[2] == 'r' ? (__DATE__[0] == 'M' ? 3 : 4) \
+  : __DATE__[2] == 'y' ? 5 \
+  : __DATE__[2] == 'l' ? 7 \
+  : __DATE__[2] == 'g' ? 8 \
+  : __DATE__[2] == 'p' ? 9 \
+  : __DATE__[2] == 't' ? 10 \
+  : __DATE__[2] == 'v' ? 11 \
+  : 12 \
+	)
+
+time_t time(time_t *t)
+{
+    (void)t;
+    return ((YEAR-1970)*365+30*MONTH)*24*60*60 + tick++;
+}
+
+void PrintTextln(char* TextArray)
+{
+    R_UART_SendString(TextArray);
+    R_UART_SendString("\r\n");
+}
+
+void main(void);
+
+#if !defined(WOLFSSL_STATIC_MEMORY)
+#include    <stddef.h>
+#define     SIZEOF_HEAP 0xB000
+int     _REL_sysheap[SIZEOF_HEAP >> 2];
+size_t  _REL_sizeof_sysheap = SIZEOF_HEAP;
+#endif
+
+void main(void)
+{
+   byte ret;
+
+   R_SYSTEM_ClockInit();
+   R_SYSTEM_TimerInit();
+   R_SYSTEM_TimerStart();
+   R_UART_Init();
+   R_LIN_Init();
+   /* Enable Table Interrupt */
+   R_INTC_SetTableBit((uint16_t*)R_ICOSTM0);
+   R_INTC_UnmaskInterrupt((uint16_t*)R_ICOSTM0);
+   /* Enable interrupts */
+    __EI();
+
+   rh_string_init(MSG_LEN + 1, &msg_offset, msg_buf);
+   printf("System Initialization finish.");
+   printf("RSA Sign and Verify Example");
+
+   ret = rsapss_sign_verify();
+   if (ret != 0) {
+        printf("rsapss_sign_verify failed ret=%d.", ret);
+   }
+}