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roulette chaff mode functional.

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TODO: corpus mode from a file rather than builtin data
This commit is contained in:
Russ Magee 2022-08-08 10:13:55 -07:00
parent adbc3e690a
commit 3d327b6b7c
1 changed files with 16 additions and 12 deletions
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28
xsnet/net.go
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@ -69,6 +69,9 @@ type (
msecsMin uint //msecs min interval msecsMin uint //msecs min interval
msecsMax uint //msecs max interval msecsMax uint //msecs max interval
szMax uint // max size in bytes szMax uint // max size in bytes
fromIdx uint // used for corpus-style fill context across
fillIdx uint // ..chaff yield calls
} }
// Conn is a connection wrapping net.Conn with KEX & session state // Conn is a connection wrapping net.Conn with KEX & session state
@ -1563,6 +1566,8 @@ func (hc *Conn) SetupChaff(mode ChaffMode, msecsMin uint, msecsMax uint, szMax u
hc.chaff.mode = mode hc.chaff.mode = mode
case ChaffConfigCorpusA: case ChaffConfigCorpusA:
hc.chaff.mode = mode hc.chaff.mode = mode
hc.chaff.fillIdx = 0
hc.chaff.fromIdx = 0
case ChaffConfigRoulette: case ChaffConfigRoulette:
hc.chaff.mode = mode hc.chaff.mode = mode
default: default:
@ -1579,17 +1584,15 @@ func randBytes(sz uint) (r []byte) {
return r return r
} }
func fillBufferWithText(fillerMat string, sz uint) (r []byte) { func fillBufferWithText(fillerMat string, sz uint, fromIdx *uint, fillIdx *uint) (r []byte) {
r = make([]byte, sz) r = make([]byte, sz)
fromIdx := 0 for *fillIdx < sz {
fillIdx := uint(0) if *fromIdx == uint(len(fillerMat)) {
for fillIdx < sz { *fromIdx = /* 0 */ uint(rand.Intn(len(fillerMat)))
if fromIdx == len(fillerMat) {
fromIdx = /* 0 */ rand.Intn(len(fillerMat))
} }
r[fillIdx] = fillerMat[fromIdx] r[*fillIdx] = fillerMat[*fromIdx]
fillIdx++ *fillIdx++
fromIdx++ *fromIdx++
} }
return r return r
} }
@ -1598,7 +1601,7 @@ func ChaffStrategy(mode ChaffMode) (s ChaffMode) {
if mode == ChaffConfigRoulette { if mode == ChaffConfigRoulette {
s = ChaffMode(int(rand.Intn(ChaffConfigRoulette))) s = ChaffMode(int(rand.Intn(ChaffConfigRoulette)))
} }
fmt.Printf("strategy:%v\n", s) //fmt.Printf("strategy:%v\n", s)
return return
} }
@ -1616,8 +1619,9 @@ func (hc *Conn) chaffHelper() {
switch strat { switch strat {
case ChaffConfigCorpusA: case ChaffConfigCorpusA:
bufTmp = fillBufferWithText(corpusTextA, hc.chaff.szMax) bufTmp = fillBufferWithText(corpusTextA, hc.chaff.szMax, &hc.chaff.fromIdx, &hc.chaff.fillIdx)
case ChaffConfigRand: case ChaffConfigRand:
fallthrough
default: default:
bufTmp = randBytes(hc.chaff.szMax) bufTmp = randBytes(hc.chaff.szMax)
} }
@ -1652,6 +1656,6 @@ attempting to decode a live or recorded xs session you should note that this cha
text will probably give you no end of difficulties, and that is by design. Have you text will probably give you no end of difficulties, and that is by design. Have you
considered your life path? Snooping on other individuals, either domestic or foreign, considered your life path? Snooping on other individuals, either domestic or foreign,
is an ethically questionable career and you may be doing more harm than good to democracy, is an ethically questionable career and you may be doing more harm than good to democracy,
international relations, and general welfare of humanity. Consider buying a nice quiet international relations, and the general welfare of humanity. Consider buying a nice quiet
cabin somewhere by a lake, growing food and spending time with those you love.` cabin somewhere by a lake, growing food and spending time with those you love.`
) )