diff options
Diffstat (limited to 'vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/nsecx.go')
-rw-r--r-- | vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/nsecx.go | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/nsecx.go b/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/nsecx.go deleted file mode 100644 index 9b908c447..000000000 --- a/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/nsecx.go +++ /dev/null @@ -1,106 +0,0 @@ -package dns - -import ( - "crypto/sha1" - "hash" - "strings" -) - -type saltWireFmt struct { - Salt string `dns:"size-hex"` -} - -// HashName hashes a string (label) according to RFC 5155. It returns the hashed string in uppercase. -func HashName(label string, ha uint8, iter uint16, salt string) string { - saltwire := new(saltWireFmt) - saltwire.Salt = salt - wire := make([]byte, DefaultMsgSize) - n, err := packSaltWire(saltwire, wire) - if err != nil { - return "" - } - wire = wire[:n] - name := make([]byte, 255) - off, err := PackDomainName(strings.ToLower(label), name, 0, nil, false) - if err != nil { - return "" - } - name = name[:off] - var s hash.Hash - switch ha { - case SHA1: - s = sha1.New() - default: - return "" - } - - // k = 0 - s.Write(name) - s.Write(wire) - nsec3 := s.Sum(nil) - // k > 0 - for k := uint16(0); k < iter; k++ { - s.Reset() - s.Write(nsec3) - s.Write(wire) - nsec3 = s.Sum(nsec3[:0]) - } - return toBase32(nsec3) -} - -// Cover returns true if a name is covered by the NSEC3 record -func (rr *NSEC3) Cover(name string) bool { - nameHash := HashName(name, rr.Hash, rr.Iterations, rr.Salt) - owner := strings.ToUpper(rr.Hdr.Name) - labelIndices := Split(owner) - if len(labelIndices) < 2 { - return false - } - ownerHash := owner[:labelIndices[1]-1] - ownerZone := owner[labelIndices[1]:] - if !IsSubDomain(ownerZone, strings.ToUpper(name)) { // name is outside owner zone - return false - } - - nextHash := rr.NextDomain - if ownerHash == nextHash { // empty interval - return false - } - if ownerHash > nextHash { // end of zone - if nameHash > ownerHash { // covered since there is nothing after ownerHash - return true - } - return nameHash < nextHash // if nameHash is before beginning of zone it is covered - } - if nameHash < ownerHash { // nameHash is before ownerHash, not covered - return false - } - return nameHash < nextHash // if nameHash is before nextHash is it covered (between ownerHash and nextHash) -} - -// Match returns true if a name matches the NSEC3 record -func (rr *NSEC3) Match(name string) bool { - nameHash := HashName(name, rr.Hash, rr.Iterations, rr.Salt) - owner := strings.ToUpper(rr.Hdr.Name) - labelIndices := Split(owner) - if len(labelIndices) < 2 { - return false - } - ownerHash := owner[:labelIndices[1]-1] - ownerZone := owner[labelIndices[1]:] - if !IsSubDomain(ownerZone, strings.ToUpper(name)) { // name is outside owner zone - return false - } - if ownerHash == nameHash { - return true - } - return false -} - -func packSaltWire(sw *saltWireFmt, msg []byte) (int, error) { - off, err := packStringHex(sw.Salt, msg, 0) - if err != nil { - return off, err - } - return off, nil -} |