Fix DRBG size cast issue (#386)

* Fix fenrir issue and test PRB trigger

* Force fail for testing

* Fix up for CI

Author: ColtonWilley

src/wp_drbg.c

@@ -303,6 +303,9 @@ static int wp_drbg_generate(wp_DrbgCtx* ctx, unsigned char* out,
     (void)addIn;
     (void)addInLen;
 #endif
+    if (ok && (outLen > 0xFFFFFFFFU)) {
+        ok = 0;
+    }
     if (ok) {
         rc = wc_RNG_GenerateBlock(ctx->rng, out, (word32)outLen);
         if (rc != 0) {
@@ -595,6 +598,11 @@ static size_t wp_drbg_get_seed(wp_DrbgCtx* ctx, unsigned char** pSeed,
         goto end;
     }
 
+    if (minLen > 0xFFFFFFFFU) {
+        OPENSSL_secure_free(buffer);
+        goto end;
+    }
+
     rc = wc_RNG_GenerateBlock(ctx->rng, buffer, (word32)minLen);
     if (rc != 0) {
         WOLFPROV_MSG_DEBUG_RETCODE(WP_LOG_COMP_RNG,