diff --git a/hmac-sha1.c b/hmac-sha1.c
new file mode 100644
index 0000000000000000000000000000000000000000..fab0fe4d86ff367059514c79ae42f2d83bf8e3b2
--- /dev/null
+++ b/hmac-sha1.c
@@ -0,0 +1,47 @@
+/* hmac-sha1.c
+ *
+ * HMAC-SHA1 message authentication code.
+ */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2002 Niels Möller
+ *  
+ * The nettle library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ * 
+ * The nettle library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the nettle library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#include "hmac.h"
+
+void
+hmac_sha1_set_key(struct hmac_sha1_ctx *ctx,
+		  unsigned key_length, const uint8_t *key)
+{
+  HMAC_SET_KEY(ctx, &nettle_sha1, key_length, key);
+}
+
+void
+hmac_sha1_update(struct hmac_sha1_ctx *ctx,
+		 unsigned length, const uint8_t *data)
+{
+  sha1_update(&ctx->state, length, data);
+}
+
+void
+hmac_sha1_digest(struct hmac_sha1_ctx *ctx,
+		 unsigned length, uint8_t *digest)
+{
+  HMAC_DIGEST(ctx, &nettle_sha1, length, digest);
+}