Decode the key usage extension as LE not BE

Author: julek-wolfssl

wolfcrypt/src/asn.c

@@ -19247,14 +19247,24 @@ static int DecodeKeyUsage(const byte* input, word32 sz, DecodedCert* cert)
 #else
     ASNGetData dataASN[keyUsageASN_Length];
     word32 idx = 0;
+    byte keyUsage[OPAQUE16_LEN];
+    word32 keyUsageSz = sizeof(keyUsage);
+    int ret;
     WOLFSSL_ENTER("DecodeKeyUsage");
 
     /* Clear dynamic data and set where to store extended key usage. */
     XMEMSET(dataASN, 0, sizeof(dataASN));
-    GetASN_Int16Bit(&dataASN[KEYUSAGEASN_IDX_STR], &cert->extKeyUsage);
+    GetASN_Buffer(&dataASN[KEYUSAGEASN_IDX_STR], keyUsage, &keyUsageSz);
     /* Parse key usage. */
-    return GetASN_Items(keyUsageASN, dataASN, keyUsageASN_Length, 0, input,
+    ret = GetASN_Items(keyUsageASN, dataASN, keyUsageASN_Length, 0, input,
                         &idx, sz);
+    if (ret == 0) {
+        /* Decode the bit string number as LE */
+        cert->extKeyUsage = (word16)(keyUsage[0]);
+        if (keyUsageSz == 2)
+            cert->extKeyUsage |= (word16)(keyUsage[1] << 8);
+    }
+    return ret;
 #endif /* WOLFSSL_ASN_TEMPLATE */
 }