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Fix intermittent issues with Randomized parrot (#19)

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Fix intermittent issues with Randomized parrot
This commit is contained in:
sergeyfrolov 2019-02-04 13:41:38 -07:00 • committed by GitHub
parent 323a55944c
commit 3fe91d9822
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3 changed files with 11 additions and 7 deletions
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12
u_parrots.go
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@ -534,10 +534,11 @@ func (uconn *UConn) generateRandomizedSpec(WithALPN bool) (ClientHelloSpec, erro
if tossBiasedCoin(0.59) {
sigAndHashAlgos = append(sigAndHashAlgos, ECDSAWithP521AndSHA512)
}
if tossBiasedCoin(0.51) {
// these usually go together
if tossBiasedCoin(0.51) || p.TLSVersMax == VersionTLS13 {
// https://tools.ietf.org/html/rfc8446 says "...RSASSA-PSS (which is mandatory in TLS 1.3)..."
sigAndHashAlgos = append(sigAndHashAlgos, PSSWithSHA256)
if tossBiasedCoin(0.9) {
// these usually go together
sigAndHashAlgos = append(sigAndHashAlgos, PSSWithSHA384)
sigAndHashAlgos = append(sigAndHashAlgos, PSSWithSHA512)
}
@ -606,8 +607,11 @@ func (uconn *UConn) generateRandomizedSpec(WithALPN bool) (ClientHelloSpec, erro
ks := KeyShareExtension{[]KeyShare{
{Group: X25519}, // the key for the group will be generated later
}}
if tossBiasedCoin(0.5) {
ks.KeyShares = append(ks.KeyShares, KeyShare{Group: CurveP256})
if tossBiasedCoin(0.25) {
// do not ADD second keyShare because crypto/tls does not support multiple ecdheParams
// TODO: add it back when they implement multiple keyShares, or implement it oursevles
// ks.KeyShares = append(ks.KeyShares, KeyShare{Group: CurveP256})
ks.KeyShares[0].Group = CurveP256
}
pskExchangeModes := PSKKeyExchangeModesExtension{[]uint8{pskModeDHE}}
supportedVersionsExt := SupportedVersionsExtension{