Description of problem:
Unbound in RHEL is compiled with option --disable-ecdsa which effectivelly disables support for RFC 6605.

This is going to cause interoperability problems in near future because ECDSA algorithms are going to be deployed at scale e.g. by Cloudflare.

Version-Release number of selected component (if applicable):
1.4.20-23

How reproducible:
100 %

Steps to Reproduce:
0. Install unbound with default configuration and run it
1. Attempt to validate domain which is DNSSEC-signed using one of ECDSA algorithms. See below.

Actual results:
$ dig @127.0.0.1 ds-4.alg-14-nsec.dnssec-test.org
[...]
;; flags: qr rd ra;

Flags in the answer do not contain AD bit, so apparently the answer was not validated by Unbound. The test domain is signed using ECDSA alg # 14:
http://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml#dns-sec-alg-numbers-1


Expected results:
$ dig @127.0.0.1 ds-4.alg-14-nsec.dnssec-test.org
[...]
;; flags: qr rd ra ad;

AD bit is set, i.e. the validation passed.

Additional info:
bind-9.9.4-18.el7_1.2.x86_64 in RHEL 7 supports ECDSA and validates the data properly. Not supporting ECDSA in Unbound will give uneven experience (interoperability problems aside).