--- /dev/null
+/*
+ * PDKIM - a RFC4871 (DKIM) implementation
+ *
+ * Copyright (C) 2016 Exim maintainers
+ *
+ * Hash interface functions
+ */
+
+#include "../exim.h"
+
+#if !defined(HASH_H) /* entire file */
+#define HASH_H
+
+#ifndef SUPPORT_TLS
+# error Need SUPPORT_TLS for DKIM
+#endif
+
+#include "crypt_ver.h"
+#include "../blob.h"
+#include "../hash.h"
+
+#ifdef RSA_OPENSSL
+# include <openssl/rsa.h>
+# include <openssl/ssl.h>
+# include <openssl/err.h>
+#elif defined(RSA_GNUTLS)
+# include <gnutls/gnutls.h>
+# include <gnutls/x509.h>
+#endif
+
+#if defined(SHA_OPENSSL)
+# include "pdkim.h"
+#elif defined(SHA_GCRYPT)
+# include "pdkim.h"
+#endif
+
+#endif
+/* End of File */