GCC-ARM IDE improvements:

* Added documentation for `ECC_USER_CURVES`.
* Added option for RSA PSS padding support.

IDE/GCC-ARM/Header/user_settings.h

@@ -87,6 +87,11 @@ extern "C" {
         #undef  WC_NO_HARDEN
         #define WC_NO_HARDEN
     #endif
+
+    /* RSA PSS Support */
+    #if 0
+        #define WC_RSA_PSS
+    #endif
 #else
     #define NO_RSA
 #endif
@@ -378,6 +383,9 @@ extern unsigned int custom_rand_generate(void);
 #undef  NO_CRYPT_BENCHMARK
 //#define NO_CRYPT_BENCHMARK
 
+#undef  WOLFCRYPT_ONLY
+//#define WOLFCRYPT_ONLY
+
 /* In-lining of misc.c functions */
 /* If defined, must include wolfcrypt/src/misc.c in build */
 /* Slower, but about 1k smaller */

IDE/GCC-ARM/README.md

@@ -64,3 +64,4 @@ AES GCM: `GCM_SMALL`, `GCM_WORD32` or `GCM_TABLE`: Tunes performance and flash/m
 * `USE_SLOW_SHA512`: Over twice as small, but 50% slower
 * `USE_CERT_BUFFERS_1024` or `USE_CERT_BUFFERS_2048`: Size of RSA certs / keys to test with. 
 * `BENCH_EMBEDDED`: Define this if using the wolfCrypt test/benchmark and using a low memory target.
+* `ECC_USER_CURVES`: Allows user to defines curve sizes to enable. Default is 256-bit on. To enable others use `HAVE_ECC192`, `HAVE_ECC224`, etc....