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-rw-r--r--m4/sha256.m414
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diff --git a/m4/sha256.m4 b/m4/sha256.m4
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+# sha256.m4 serial 8
+dnl Copyright (C) 2005, 2008-2018 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+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])
+])