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Implement GetOutKeystream()

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Sergey Frolov 2017-09-06 16:51:32 -06:00
parent 004572df2e
commit 08a039c453
2 changed files with 12 additions and 0 deletions
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1
README.md
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@ -3,6 +3,7 @@
## Low-level access to handshake ## Low-level access to handshake
* Read/write access to all bits of client hello message. * Read/write access to all bits of client hello message.
* Read access to fields of ClientHandshakeState, which, among other things, includes ServerHello and MasterSecret. * Read access to fields of ClientHandshakeState, which, among other things, includes ServerHello and MasterSecret.
* Read keystream. Can be used to "write" something in ciphertext.
## ClientHello fingerprinting resistance ## ClientHello fingerprinting resistance
Golang's ClientHello has a very unique fingerprint, which especially sticks out on mobile clients, Golang's ClientHello has a very unique fingerprint, which especially sticks out on mobile clients,
where Golang is not too popular yet. where Golang is not too popular yet.

11
u_conn.go
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@ -435,3 +435,14 @@ func (uconn *UConn) MarshalClientHello() error {
hello.Raw = helloBuffer.Bytes() hello.Raw = helloBuffer.Bytes()
return nil return nil
} }
// get current state of cipher and encrypt zeros to get keystream
func (uconn *UConn) GetOutKeystream(length int) ([]byte, error) {
zeros := make([]byte, length)
if outCipher, ok := uconn.out.cipher.(cipher.AEAD); ok {
// AEAD.Seal() does not mutate internal state, other ciphers might
return outCipher.Seal(nil, uconn.out.seq[:], zeros, nil), nil
}
return nil, errors.New("Could not convert OutCipher to cipher.AEAD")
}