md5, sha1, sha256, sha512: use openssl routines if available

[gnulib.git] / m4 / sha256.m4

diff --git a/m4/sha256.m4 b/m4/sha256.m4
index cbbd17a..3a19467 100644 (file)
--- a/m4/sha256.m4
+++ b/m4/sha256.m4
@@ -1,4 +1,4 @@
-# sha256.m4 serial 7
+# sha256.m4 serial 8
 dnl Copyright (C) 2005, 2008-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -8,5 +8,7 @@ AC_DEFUN([gl_SHA256],
 [
   dnl Prerequisites of lib/sha256.c.
   AC_REQUIRE([gl_BIGENDIAN])
-  :
+
+  dnl Determine HAVE_OPENSSL_SHA256 and LIB_CRYPTO
+  gl_CRYPTO_CHECK([SHA256])
 ])