Bug 1536734 - Don't endian-swap on big endian machines, r=jcj

Summary:
Identity works in that case.

Reviewers: jcj

Tags: #secure-revision

Bug #: 1536734

Differential Revision: https://phabricator.services.mozilla.com/D24128

--HG--
extra : rebase_source : 50cd2037e9dc3fb3d6adbd97d7a2d69357977437

lib/freebl/crypto_primitives.h

@@ -34,6 +34,7 @@
 /*
  * FREEBL_HTONLL(x): swap bytes in a 64-bit integer.
  */
+#if defined(IS_LITTLE_ENDIAN)
 #if defined(_MSC_VER)
 
 #pragma intrinsic(_byteswap_uint64)
@@ -57,4 +58,8 @@ PRUint64 swap8b(PRUint64 x);
 
 #endif /* _MSC_VER */
 
+#else /* IS_LITTLE_ENDIAN */
+#define FREEBL_HTONLL(x) (x)
+#endif
+
 #endif /* HAVE_LONG_LONG */