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Fixed IV feed into initial HMAC during chan setup

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This commit is contained in:
Russ Magee 2021-11-22 18:38:46 -08:00
parent 02e379e50d
commit 4168b5038b
2 changed files with 4 additions and 2 deletions
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4
xsnet/chan.go
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@ -105,9 +105,11 @@ func (hc *Conn) getStream(keymat []byte) (rc cipher.Stream, mc hash.Hash, err er
log.Printf("[cipher BLOWFISH_64 (%d)]\n", copts)
case CAlgCryptMT1:
rc = cryptmt.New(nil, nil, keymat)
//NOTE: this alg is not based on block cipher, no IV
log.Printf("[cipher CRYPTMT1 (%d)]\n", copts)
case CAlgHopscotch:
rc = hopscotch.New(nil, nil, 4, keymat)
//NOTE: this alg is not based on block cipher, no IV
log.Printf("[cipher HOPSCOTCH (%d)]\n", copts)
case CAlgChaCha20_12:
keymat = expandKeyMat(keymat, chacha.KeySize)
@ -152,7 +154,7 @@ func (hc *Conn) getStream(keymat []byte) (rc cipher.Stream, mc hash.Hash, err er
//os.Exit(1)
}
if err != nil {
if err == nil && ivlen > 0 {
// Feed the IV into the hmac: all traffic in the connection must
// feed its data into the hmac afterwards, so both ends can xor
// that with the stream to detect corruption.