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CentOS 7.0 - man page for ldns-key2ds (centos section 1)

ldns-key2ds(1)						      General Commands Manual						    ldns-key2ds(1)

ldns-key2ds - transform a DNSKEY RR to a DS RR
ldns-key2ds file
ldns-key2ds is used to transform a public DNSKEY RR to a DS RR. When run it will read file with a DNSKEY RR in it and it will create a .ds file with the DS RR in it. It prints out the basename for this file (K<name>+<alg>+<id>). By default it takes a pick of algorithm similar to the key algorithm, SHA1 for RSASHA1, and so on.
-f Ignore SEP flag (i.e. make DS records for any key) -n Write the result DS Resource Record to stdout instead of a file -1 Use SHA1 as the hash function. -2 Use SHA256 as the hash function
Written by the ldns team as an example for ldns usage.
Report bugs to <>.
Copyright (C) 2005 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR- POSE. 30 May 2005 ldns-key2ds(1)