configure with ECC256 only

IDE/ECLIPSE/SIFIVE/README.md

@@ -15,12 +15,6 @@ The `IDE/ECLIPSE/SIFIVE/main.c` example application provides a function to run t
 - #undef NO_CRYPT_TEST
 - #undef NO_CRYPT_BENCHMARK
 ```
-## Tested Configurations
-- SHA-1
-- SHA-256
-- AES CBC
-- ECC sign/verify/shared secret with fast math library
-
 ## Setup
 ### Setting up the SDK with wolfSSL
 1. Download the wolfSSL source code or a zip file from GitHub and place it under your SDK `$HOME` directory. You can also copy or simlink to the source.
@@ -178,6 +172,12 @@ ECDSA    256 sign            2 ops took 25.000 sec, avg 12500.000 ms, 0.080 ops/
 ECDSA    256 verify          2 ops took 48.000 sec, avg 24000.000 ms, 0.042 ops/sec
 Benchmark complete
 ```
+## Tested Configurations
+- SHA-1
+- SHA-256
+- AES CBC
+- ECC 256 sign/verify/shared secret with fast math library
+
 ## Known Caveats
 - If you find the wolfcrypt test stuck on early_trap_vector error, it is like related to memory issues
 - Using the `__stack_size` default value of 0x400 will not be enough for the ECC test to pass.

IDE/ECLIPSE/SIFIVE/main.c

@@ -33,16 +33,27 @@
 /*-specs=nano.specs doesn’t include support for floating point in printf()*/
 asm (".global _printf_float");
 
-#define RTC_FREQ    32768
+#ifndef RTC_FREQ
+    #define RTC_FREQ    32768
+#endif
+
 #define CLINT_MTIME_ADDR  0x200bff8
 #define WOLFSSL_SIFIVE_RISC_V_DEBUG 0
 
+unsigned long get_cpu_freq(void)
+{
+    /* If clocking up the CPU, you need to add a logic to measure cpu freq */
+
+    return RTC_FREQ;
+}
+
 double current_time(int reset)
 {
     volatile uint64_t * mtime  = (uint64_t*) (CLINT_MTIME_ADDR);
     uint64_t now = *mtime;
     (void)reset;
-    return now/RTC_FREQ;
+    /**/
+    return now/get_cpu_freq();
 }
 #endif
 
@@ -70,7 +81,7 @@ void mtime_sleep( uint64_t ticks) {
 }
 
 void delay(int sec) {
-    uint64_t ticks = sec * RTC_FREQ;
+    uint64_t ticks = sec * get_cpu_freq();
     mtime_sleep(ticks);
 }
 #endif 
@@ -120,7 +131,7 @@ int main(void)
 #if WOLFSSL_SIFIVE_RISC_V_DEBUG
     printf("check stack and heap addresses\n");
     check(8);
-    printf("sleep for 10 seconds to verify timer\n");
+    printf("sleep for 10 seconds to verify timer, measure using a stopwatch\n");
     delay(10);
     printf("awake after sleeping for 10 seconds\n");
 #endif    

IDE/ECLIPSE/SIFIVE/user_settings.h

@@ -117,12 +117,12 @@ extern "C" {
     #define ECC_USER_CURVES
 
     #ifdef ECC_USER_CURVES
-        /* Manual Curve Selection */
+        /* Manual Curve Selection, FP_MAX_BITS must be adjusted accordingly */
-        #define HAVE_ECC192
+        // #define HAVE_ECC192
-        #define HAVE_ECC224
+        // #define HAVE_ECC224
         #undef NO_ECC256
-        #define HAVE_ECC384
+        // #define HAVE_ECC384
-        #define HAVE_ECC521
+        // #define HAVE_ECC521
     #endif
 
     /* Fixed point cache (speeds repeated operations against same private key) */