test: rsa: reset RSA key between operation

Author: rizlik

wolfcrypt/test/test.c

@@ -26009,6 +26009,21 @@ WOLFSSL_TEST_SUBROUTINE wc_test_ret_t rsa_test(void)
 
 #if !defined(WOLFSSL_RSA_VERIFY_ONLY) && !defined(WOLFSSL_RSA_PUBLIC_ONLY) && \
     !defined(WC_NO_RNG) && !defined(WOLF_CRYPTO_CB_ONLY_RSA)
+    /* Reload the key so the public-encrypt below is the first operation
+     * against it. Exercises backends that distinguish public-only material
+     * from full-keypair bindings: a public-encrypt on a freshly-loaded key
+     * must not prevent the subsequent private-decrypt from using the private
+     * key material the caller originally provided. */
+#ifndef NO_ASN
+    wc_FreeRsaKey(key);
+    ret = wc_InitRsaKey_ex(key, HEAP_HINT, devId);
+    if (ret != 0)
+        ERROR_OUT(WC_TEST_RET_ENC_EC(ret), exit_rsa);
+    idx = 0;
+    ret = wc_RsaPrivateKeyDecode(tmp, &idx, key, (word32)bytes);
+    if (ret != 0)
+        ERROR_OUT(WC_TEST_RET_ENC_EC(ret), exit_rsa);
+#endif
     do {
 #if defined(WOLFSSL_ASYNC_CRYPT)
         ret = wc_AsyncWait(ret, &key->asyncDev, WC_ASYNC_FLAG_CALL_AGAIN);