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diff --git a/external/unbound/validator/val_secalgo.h b/external/unbound/validator/val_secalgo.h
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+++ b/external/unbound/validator/val_secalgo.h
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+/*
+ * validator/val_secalgo.h - validator security algorithm functions.
+ *
+ * Copyright (c) 2012, NLnet Labs. All rights reserved.
+ *
+ * This software is open source.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 
+ * Neither the name of the NLNET LABS nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * \file
+ *
+ * This file contains helper functions for the validator module.
+ * The functions take buffers with raw data and convert to library calls.
+ */
+
+#ifndef VALIDATOR_VAL_SECALGO_H
+#define VALIDATOR_VAL_SECALGO_H
+struct sldns_buffer;
+
+/**
+ * Return size of DS digest according to its hash algorithm.
+ * @param algo: DS digest algo.
+ * @return size in bytes of digest, or 0 if not supported. 
+ */
+size_t ds_digest_size_supported(int algo);
+
+/**
+ * @param algo: the DS digest algo
+ * @param buf: the buffer to digest
+ * @param len: length of buffer to digest.
+ * @param res: result stored here (must have sufficient space).
+ * @return false on failure.
+ */
+int secalgo_ds_digest(int algo, unsigned char* buf, size_t len,
+	unsigned char* res);
+
+/** return true if DNSKEY algorithm id is supported */
+int dnskey_algo_id_is_supported(int id);
+
+/**
+ * Check a canonical sig+rrset and signature against a dnskey
+ * @param buf: buffer with data to verify, the first rrsig part and the
+ *	canonicalized rrset.
+ * @param algo: DNSKEY algorithm.
+ * @param sigblock: signature rdata field from RRSIG
+ * @param sigblock_len: length of sigblock data.
+ * @param key: public key data from DNSKEY RR.
+ * @param keylen: length of keydata.
+ * @param reason: bogus reason in more detail.
+ * @return secure if verification succeeded, bogus on crypto failure,
+ *	unchecked on format errors and alloc failures.
+ */
+enum sec_status verify_canonrrset(struct sldns_buffer* buf, int algo,
+	unsigned char* sigblock, unsigned int sigblock_len,
+	unsigned char* key, unsigned int keylen, char** reason);
+
+#endif /* VALIDATOR_VAL_SECALGO_H */