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diff --git a/lib/dns/include/dns/ds.h b/lib/dns/include/dns/ds.h
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+/*
+ * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2002  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: ds.h,v 1.10 2007/06/19 23:47:16 tbox Exp $ */
+
+#ifndef DNS_DS_H
+#define DNS_DS_H 1
+
+#include <isc/lang.h>
+
+#include <dns/types.h>
+
+#define DNS_DSDIGEST_SHA1 (1)
+#define DNS_DSDIGEST_SHA256 (2)
+
+/*
+ * Assuming SHA-256 digest type.
+ */
+#define DNS_DS_BUFFERSIZE (36)
+
+ISC_LANG_BEGINDECLS
+
+isc_result_t
+dns_ds_buildrdata(dns_name_t *owner, dns_rdata_t *key,
+		  unsigned int digest_type, unsigned char *buffer,
+		  dns_rdata_t *rdata);
+/*%<
+ * Build the rdata of a DS record.
+ *
+ * Requires:
+ *\li	key	Points to a valid DNS KEY record.
+ *\li	buffer	Points to a temporary buffer of at least
+ * 		#DNS_DS_BUFFERSIZE bytes.
+ *\li	rdata	Points to an initialized dns_rdata_t.
+ *
+ * Ensures:
+ *  \li    *rdata	Contains a valid DS rdata.  The 'data' member refers
+ *		to 'buffer'.
+ */
+
+isc_boolean_t
+dns_ds_digest_supported(unsigned int digest_type);
+/*%<
+ * Is this digest algorithm supported by dns_ds_buildrdata()?
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* DNS_DS_H */