// A very pragmatic approach to protobuf encoding it's roughly true for most cases.
// XXX TODO: need to fix/clean that!
func PredictLenNACL(input []byte) (outlen int) {
zipped, err := icutl.CompressData(input)
if err != nil {
return 0
}
sboxLen := len(zipped) // zipped data
sboxLen += secretbox.Overhead // NACL hash appended
sboxLen += 3 // 1 byte pb header value type + 2 bytes size for the bytes part in PB message
sboxLen += 6 // 1 byte pb header + 1 byte size + 4 bytes data for AC header in PB message
sboxLen += 7 // 1 byte pb header value type + 2 byte size + 4 bytes nonce
sboxLen += 2 // 1 byte pb header value type + 1 byte size
outlen = base64.StdEncoding.EncodedLen(sboxLen)
//outlen += 14
icutl.DebugLog.Printf("PredictLenNACL(%d): %d\n", len(input), outlen)
return outlen
}
func CreateACMessageNACL(context *ickp.SecretKey, rnd, msg, myNick []byte) (out []byte, err error) {
//var noncebyte [24]byte
/* lets build our header */
myHdr, intHdr, err := BuildHeader([]byte(msgHdrAC))
if err != nil {
return nil, &icutl.AcError{Value: -1, Msg: "CreateACMessageNACL().BuildHeader(): ", Err: err}
}
// first let's compress
myBody, err := icutl.CompressData(msg)
if err != nil {
return nil, &icutl.AcError{Value: -2, Msg: "CreateACMessageNACL().CompressData(): ", Err: err}
}
//BuildNonceAC(inonce uint32, bob, mynick, myhdr []byte) (nonce []byte, noncebyte *[24]byte, err error)
_, noncebyte, err := BuildNonceAC(context.GetNonce(), context.GetBob(), myNick, myHdr)
// OPEN the key
// XXX new to check rnd and context.key are the same size
/*
for j := 0; j < len(rnd); j++ {
context.key[j] = context.key[j] ^ rnd[j]
}
*/
context.RndKey(rnd)
// encrypt
myCipher := secretbox.Seal(nil, myBody, noncebyte, context.GetSealKey())
// close the key
context.RndKey(rnd)
/*
for j := 0; j < len(rnd); j++ {
context.key[j] = context.key[j] ^ rnd[j]
}
*/
// XXX error checking
out, err = packMessageAC(intHdr, context.GetNonce(), &myCipher)
//fmt.Fprintf(os.Stderr, "NACL PB == AC MSG OUT[%d]: %s\n", len(out), out)
//context.nonce++
context.IncNonce(0)
return out, nil
}
func CreateKXMessageNACL(context *ickp.SecretKey, rnd []byte, peerPubkey, myPrivkey *[32]byte, channel, myNick, peerNick []byte) (out []byte, err error) {
/* lets build our header */
myHdr, intHdr, err := BuildHeader([]byte(msgHdrKX))
if err != nil {
return nil, &icutl.AcError{Value: -1, Msg: "CreateKXMessageNACL().BuildHeader(): ", Err: err}
}
// Open the key
context.RndKey(rnd)
//fmt.Fprintf(os.Stderr, "CREATE KX KEY: %s\n", hex.EncodeToString(context.key[:]))
// first let's compress
myBody, err := icutl.CompressData(context.GetKey())
if err != nil {
return nil, &icutl.AcError{Value: -2, Msg: "CreateKXMessageNACL().CompressData(): ", Err: err}
}
// Close the key
context.RndKey(rnd)
//fmt.Fprintf(os.Stderr, "channel: %s context.bob: %s\n", channel, context.bob)
kx_channel := IsChannelOrPriv(channel, myNick, peerNick)
// XXX i can probably use context.bob instead of a specific channel specification...
//BuildNonceAC(inonce uint32, bob, mynick, myhdr []byte) (nonce []byte, noncebyte *[24]byte, err error)
_, noncebyte, err := BuildNonceKX(context.GetNonce(), kx_channel, myNick, peerNick, myHdr)
//fmt.Fprintf(os.Stderr, "peerpk : %p myprivkey: %p\n", peerPubkey, myPrivkey)
// XXX TODO: need serious cleanup and error checking!!
//fmt.Fprintf(os.Stderr, "body.Bytes(): %p, noncebyte: %p, peerPub: %p myPriv: %p\n", myBody, &noncebyte, peerPubkey, myPrivkey)
cipherKex := box.Seal(nil, myBody, noncebyte, peerPubkey, myPrivkey)
//func packMessageKX(hdr, nonce *uint32, dst, blob *[]byte) (out []byte, err error) {
out, err = packMessageKX(intHdr, context.GetNonce(), peerNick, cipherKex)
if err != nil {
return nil, &icutl.AcError{Value: -3, Msg: "CreateKXMessageNACL().packMessageKX(): ", Err: err}
}
//context.nonce++
context.IncNonce(0)
return
}
