mirror of
https://github.com/renorris/openfsd
synced 2026-03-22 23:05:36 +08:00
108 lines
2.5 KiB
Go
108 lines
2.5 KiB
Go
package fsd
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import (
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"crypto/md5"
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"encoding/hex"
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"errors"
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)
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var ErrUnsupportedAuthClient = errors.New("vatsimauth: unsupported client")
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var vatsimAuthKeys = map[uint16]string{
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8464: "945507c4c50222c34687e742729252e6", // vSTARS
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10452: "0ad74157c7f449c216bfed04f3af9fb9", // vERAM
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24515: "3424cbcebcca6fe95f973b350ff85cef", // vatSys
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27095: "3518a62c421937ffa46ac3316957da43", // Euroscope
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33456: "52d9343020e9c7d0c6b04b0cca20ad3b", // swift
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35044: "fe28334fb753cf0e3d19942197b9ce3e", // vPilot
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48312: "bc2eb1ef4d96709c683084055dd5e83f", // TWRTrainer
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55538: "ImuL1WbbhVuD8d3MuKpWn2rrLZRa9iVP", // xPilot
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56862: "3518a62c421937ffa46ac3316957da43", // VRC
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}
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type vatsimAuthState struct {
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init, curr [16]byte
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clientId uint16
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}
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func (s *vatsimAuthState) initAsHex() (d [32]byte) {
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hex.Encode(d[:], s.init[:])
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return
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}
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func (s *vatsimAuthState) currAsHex() (d [32]byte) {
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hex.Encode(d[:], s.curr[:])
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return
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}
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func (s *vatsimAuthState) Initialize(clientId uint16, initialChallenge []byte) (err error) {
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keyStr, ok := vatsimAuthKeys[clientId]
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if !ok {
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err = ErrUnsupportedAuthClient
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return
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}
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s.clientId = clientId
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key := [32]byte{}
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copy(key[:], keyStr)
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s.init = s.runObfuscationRound(&key, initialChallenge)
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s.curr = s.init
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return
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}
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func (s *vatsimAuthState) IsInitialized() bool {
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return s.clientId != 0
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}
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func (s *vatsimAuthState) GetResponseForChallenge(challenge []byte) (res [32]byte) {
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curr := s.currAsHex()
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round := s.runObfuscationRound(&curr, challenge)
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hex.Encode(res[:], round[:])
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return
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}
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func (s *vatsimAuthState) UpdateState(d *[32]byte) {
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init := s.initAsHex()
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tmp := [64]byte{}
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copy(tmp[:32], init[:])
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copy(tmp[32:], d[:])
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s.curr = md5.Sum(tmp[:])
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}
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func (s *vatsimAuthState) runObfuscationRound(curr *[32]byte, challenge []byte) (res [16]byte) {
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c1, c2 := challenge[0:(len(challenge)/2)], challenge[(len(challenge)/2):]
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if (s.clientId & 1) == 1 {
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c1, c2 = c2, c1
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}
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s1, s2, s3 := curr[0:12], curr[12:22], curr[22:32]
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tmp := make([]byte, 0, 64)
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switch s.clientId % 3 {
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case 0:
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tmp = append(tmp, s1...)
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tmp = append(tmp, c1...)
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tmp = append(tmp, s2...)
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tmp = append(tmp, c2...)
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tmp = append(tmp, s3...)
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case 1:
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tmp = append(tmp, s2...)
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tmp = append(tmp, c1...)
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tmp = append(tmp, s3...)
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tmp = append(tmp, c2...)
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tmp = append(tmp, s1...)
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default:
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tmp = append(tmp, s3...)
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tmp = append(tmp, c1...)
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tmp = append(tmp, s1...)
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tmp = append(tmp, c2...)
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tmp = append(tmp, s2...)
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}
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res = md5.Sum(tmp)
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return
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}
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