F-1297: fix RSA signature verification check that always passed regardless of result

dtls/server-dtls.c

@@ -43,8 +43,6 @@
 static struct sockaddr_in servAddr;     /* our server's address */
 static struct sockaddr_in cliaddr;      /* the client's address */
 
-void sig_handler(const int sig);
-
 int main(int argc, char** argv)
 {
     /* Loc short for "location" */

pk/rsa/rsa-nb.c

@@ -224,7 +224,7 @@ int main(int argc, char** argv)
     verifySz = ret;
     ret = 0;
 
-    if (signSz == ret && XMEMCMP(plain, in, (size_t)ret)) {
+    if (verifySz != (int)inSz || XMEMCMP(plain, in, inSz) != 0) {
         ret = SIG_VERIFY_E;
     }
 
@@ -242,9 +242,7 @@ prog_end:
     wc_FreeRng(&rng);
     wolfSSL_Cleanup();
 
-    (void)verifySz;
-
-    return 0;
+    return ret;
 #else
     (void)kRsaKey;