Struct CDNSKEY

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pub struct CDNSKEY(/* private fields */);

Available on crate feature dnssec only.

Expand description

Child DNSKEY. See RFC 8078.

Methods from Deref<Target = DNSKEY>§

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pub fn zone_key(&self) -> bool

RFC 4034, DNSSEC Resource Records, March 2005

2.1.1.  The Flags Field

   Bit 7 of the Flags field is the Zone Key flag.  If bit 7 has value 1,
   then the DNSKEY record holds a DNS zone key, and the DNSKEY RR's
   owner name MUST be the name of a zone.  If bit 7 has value 0, then
   the DNSKEY record holds some other type of DNS public key and MUST
   NOT be used to verify RRSIGs that cover RRsets.


   Bits 0-6 and 8-14 are reserved: these bits MUST have value 0 upon
   creation of the DNSKEY RR and MUST be ignored upon receipt.

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pub fn secure_entry_point(&self) -> bool

RFC 4034, DNSSEC Resource Records, March 2005

2.1.1.  The Flags Field

   Bit 15 of the Flags field is the Secure Entry Point flag, described
   in [RFC3757].  If bit 15 has value 1, then the DNSKEY record holds a
   key intended for use as a secure entry point.  This flag is only
   intended to be a hint to zone signing or debugging software as to the
   intended use of this DNSKEY record; validators MUST NOT alter their
   behavior during the signature validation process in any way based on
   the setting of this bit.  This also means that a DNSKEY RR with the
   SEP bit set would also need the Zone Key flag set in order to be able
   to generate signatures legally.  A DNSKEY RR with the SEP set and the
   Zone Key flag not set MUST NOT be used to verify RRSIGs that cover
   RRsets.

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pub fn is_key_signing_key(&self) -> bool

A KSK has a flags value of 257

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pub fn revoke(&self) -> bool

RFC 5011, Trust Anchor Update, September 2007

RFC 5011                  Trust Anchor Update             September 2007

7.  IANA Considerations

  The IANA has assigned a bit in the DNSKEY flags field (see Section 7
  of [RFC4034]) for the REVOKE bit (8).

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pub fn algorithm(&self) -> Algorithm

RFC 4034, DNSSEC Resource Records, March 2005

2.1.3.  The Algorithm Field

   The Algorithm field identifies the public key's cryptographic
   algorithm and determines the format of the Public Key field.  A list
   of DNSSEC algorithm types can be found in Appendix A.1

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pub fn public_key(&self) -> &[u8] ⓘ

RFC 4034, DNSSEC Resource Records, March 2005

2.1.4.  The Public Key Field

   The Public Key Field holds the public key material.  The format
   depends on the algorithm of the key being stored and is described in
   separate documents.

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pub fn flags(&self) -> u16

Output the encoded form of the flags

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pub fn to_digest( &self, name: &Name, digest_type: DigestType, ) -> Result<Digest, ProtoError>

Available on crate features dnssec-openssl or dnssec-ring only.

Creates a message digest for this DNSKEY record.

5.1.4.  The Digest Field

   The DS record refers to a DNSKEY RR by including a digest of that
   DNSKEY RR.

   The digest is calculated by concatenating the canonical form of the
   fully qualified owner name of the DNSKEY RR with the DNSKEY RDATA,
   and then applying the digest algorithm.

     digest = digest_algorithm( DNSKEY owner name | DNSKEY RDATA);

      "|" denotes concatenation

     DNSKEY RDATA = Flags | Protocol | Algorithm | Public Key.

   The size of the digest may vary depending on the digest algorithm and
   DNSKEY RR size.  As of the time of this writing, the only defined
   digest algorithm is SHA-1, which produces a 20 octet digest.

§Arguments

name - the label of of the DNSKEY record.
digest_type - the DigestType with which to create the message digest.

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pub fn calculate_key_tag(&self) -> Result<u16, ProtoError>

The key tag is calculated as a hash to more quickly lookup a DNSKEY.

RFC 2535, Domain Name System Security Extensions, March 1999

RFC 2535                DNS Security Extensions               March 1999

4.1.6 Key Tag Field

 The "key Tag" is a two octet quantity that is used to efficiently
 select between multiple keys which may be applicable and thus check
 that a public key about to be used for the computationally expensive
 effort to check the signature is possibly valid.  For algorithm 1
 (MD5/RSA) as defined in [RFC 2537], it is the next to the bottom two
 octets of the public key modulus needed to decode the signature
 field.  That is to say, the most significant 16 of the least
 significant 24 bits of the modulus in network (big endian) order. For
 all other algorithms, including private algorithms, it is calculated
 as a simple checksum of the KEY RR as described in Appendix C.

Appendix C: Key Tag Calculation

 The key tag field in the SIG RR is just a means of more efficiently
 selecting the correct KEY RR to use when there is more than one KEY
 RR candidate available, for example, in verifying a signature.  It is
 possible for more than one candidate key to have the same tag, in
 which case each must be tried until one works or all fail.  The
 following reference implementation of how to calculate the Key Tag,
 for all algorithms other than algorithm 1, is in ANSI C.  It is coded
 for clarity, not efficiency.  (See section 4.1.6 for how to determine
 the Key Tag of an algorithm 1 key.)

 /* assumes int is at least 16 bits
    first byte of the key tag is the most significant byte of return
    value
    second byte of the key tag is the least significant byte of
    return value
    */

 int keytag (

         unsigned char key[],  /* the RDATA part of the KEY RR */
         unsigned int keysize, /* the RDLENGTH */
         )
 {
 long int    ac;    /* assumed to be 32 bits or larger */

 for ( ac = 0, i = 0; i < keysize; ++i )
     ac += (i&1) ? key[i] : key[i]<<8;
 ac += (ac>>16) & 0xFFFF;
 return ac & 0xFFFF;
 }