diff --git a/src/core/ngx_sha1.h b/src/core/ngx_sha1.h
new file mode 100644
index 0000000..78f52c5
--- /dev/null
+++ b/src/core/ngx_sha1.h
@@ -0,0 +1,30 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#ifndef _NGX_SHA1_H_INCLUDED_
+#define _NGX_SHA1_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+#if (NGX_HAVE_OPENSSL_SHA1_H)
+#include <openssl/sha.h>
+#else
+#include <sha.h>
+#endif
+
+
+typedef SHA_CTX  ngx_sha1_t;
+
+
+#define  ngx_sha1_init    SHA1_Init
+#define  ngx_sha1_update  SHA1_Update
+#define  ngx_sha1_final   SHA1_Final
+
+
+#endif /* _NGX_SHA1_H_INCLUDED_ */