http://www.rfc-editor.org/rfc/rfc5702.txt
RFC 5702: Use of SHA-2 Algorithms with RSA in DNSKEY and RRSIG Resource Records for DNSSEC, J. Jansen2009-10-01T23:00:00-00:00This document describes how to produce RSA/SHA-256 and RSA/SHA-512 DNSKEY and RRSIG resource records for use in the Domain Name System Security Extensions (RFC 4033, RFC 4034, and RFC 4035). [STANDARDS TRACK]