Fix SE050 RSA port bugs

- se050_rsa_verify: when the function uploads only the public part of the key (keyCreated == 1), erase the transient SE050 object and don't persist keyIdSet = 1. A subsequent sign on the same RsaKey was reusing the public-only SE050 object and failing. Pre-existing bindings (from wc_RsaUseKeyId or a prior sign that uploaded a keypair) are preserved untouched.

- rsa_keygen_test: add WOLFSSL_SE050 to the existing WOLFSSL_CRYPTOCELL guard around the export-then-decode round-trip. SE050-generated keys keep their private components in the secure element, so wc_RsaKeyToDer + wc_RsaPrivateKeyDecode cannot complete. Matching guard on the idx declaration to avoid an unused-variable warning.

Author: LinuxJedi

wolfcrypt/src/port/nxp/se050_port.c

@@ -1538,8 +1538,22 @@ int se050_rsa_verify(const byte* in, word32 inLen, byte* out, word32 outLen,
     }
 
     if (status == kStatus_SSS_Success) {
-        key->keyId = keyId;
-        key->keyIdSet = 1;
+        if (keyCreated) {
+            /* We uploaded only the public part of the key for this verify.
+             * Don't persist keyIdSet=1 — a later sign on the same RsaKey
+             * would reuse this binding and fail because the SE050 object has
+             * no private material. Erase the transient object so the next
+             * SE050 op (sign or verify) re-uploads from whatever the host
+             * RsaKey currently holds. */
+            sss_key_store_erase_key(&host_keystore, &newKey);
+            sss_key_object_free(&newKey);
+        }
+        else {
+            /* Pre-existing keyIdSet=1 binding (e.g. wc_RsaUseKeyId or prior
+             * sign that uploaded a keypair). Preserve it. */
+            key->keyId = keyId;
+            key->keyIdSet = 1;
+        }
     }
     else {
         if (keyCreated) {

wolfcrypt/test/test.c

@@ -25357,7 +25357,7 @@ static wc_test_ret_t rsa_keygen_test(WC_RNG* rng)
 #else
     byte der[1280];
 #endif
-#ifndef WOLFSSL_CRYPTOCELL
+#if !defined(WOLFSSL_CRYPTOCELL) && !defined(WOLFSSL_SE050)
     word32 idx = 0;
 #endif
     int    derSz = 0;
@@ -25435,13 +25435,16 @@ static wc_test_ret_t rsa_keygen_test(WC_RNG* rng)
     if (ret != 0)
         ERROR_OUT(WC_TEST_RET_ENC_EC(ret), exit_rsa);
 
-#ifndef WOLFSSL_CRYPTOCELL
+#if !defined(WOLFSSL_CRYPTOCELL) && !defined(WOLFSSL_SE050)
     idx = 0;
-    /* The private key part of the key gen pairs from cryptocell can't be exported */
+    /* The private key part of key pairs generated inside a secure element
+     * (CryptoCell, SE050) stays in hardware and isn't available to
+     * wc_RsaKeyToDer, so the exported DER can't be parsed back as a
+     * complete RSAPrivateKey. */
     ret = wc_RsaPrivateKeyDecode(der, &idx, genKey, (word32)derSz);
     if (ret != 0)
         ERROR_OUT(WC_TEST_RET_ENC_EC(ret), exit_rsa);
-#endif /* WOLFSSL_CRYPTOCELL */
+#endif /* !WOLFSSL_CRYPTOCELL && !WOLFSSL_SE050 */
 #endif /* !WC_TEST_SKIP_RSA_PRIVATE_EXPORT */
 
 exit_rsa: