func sworker(name string, conn *net.TCPConn) {
debug := utils.NewDebug(utils.USER, name)
defer func() {
debug.Printf("... %s worker finished.", name)
conn.Close()
}()
debug.Printf("%s worker connected to remote address %s", name, conn.RemoteAddr())
// Obtain keys etc.
keyA, e := aeskey.KeyA()
if e != nil {
fmt.Printf("%s AES key error: %v\n", name, e)
return
}
debug.PrintBuffer(keyA, "A's Key = ")
ivA, e := aeskey.IvA()
if e != nil {
fmt.Printf("AES IV error: %v\n", e)
return
}
debug.PrintBuffer(ivA, "A's IV = ")
keyB, e := aeskey.KeyB()
if e != nil {
fmt.Printf("%s AES key error: %v\n", name, e)
return
}
debug.PrintBuffer(keyB, "B's Key = ")
ivB, e := aeskey.IvB()
if e != nil {
fmt.Printf("AES IV error: %v\n", e)
return
}
debug.PrintBuffer(ivB, "B's IV = ")
sessionKey, e := aeskey.SessionKey()
if e != nil {
fmt.Printf("%s AES key error: %v\n", name, e)
return
}
//Get input from TCP stream
ibuff := utils.MakeTcpIEncoding(conn)
debug.Printf("Reading A")
a, e := ibuff.ReadString()
if e != nil {
fmt.Printf("%s Error: %v\n", name, e)
return
}
debug.Printf("A = %v", a)
if a != "student" {
fmt.Printf("Incorrect name for A\n")
return
}
debug.Printf("Reading B")
b, e := ibuff.ReadString()
if e != nil {
fmt.Printf("%s Error: %v\n", name, e)
return
}
debug.Printf("B = %v", b)
if b != "lecturer" {
fmt.Printf("Incorrect name for B\n")
return
}
debug.Printf("Reading nonce N")
nonce, e := ibuff.ReadBinary()
if e != nil {
fmt.Printf("%s Error: %v\n", name, e)
return
}
debug.PrintBuffer(nonce, "Nonce N = ")
// Send output to TCP stream
obuff := utils.MakeTcpOEncoding(conn)
// Set up & send B's Key Token
var token_B nssktokens.BToken
token_B.A = a
token_B.Key = sessionKey[0:]
ciphertext, e := nssktokens.WriteBToken(debug, ivB, keyB, &token_B)
if e != nil {
fmt.Printf("%s Error: %v\n", e)
return
}
// Set up & send A's Key Token
var token_A nssktokens.AToken
token_A.Nonce = nonce[0:]
token_A.B = b
token_A.Key = sessionKey[0:]
token_A.CipherText = ciphertext
e = nssktokens.WriteAToken(debug, ivA, keyA, &token_A, obuff)
if e != nil {
fmt.Printf("%s Error: %v\n", e)
return
}
}
func sworker(name string, conn *net.TCPConn) {
debug := utils.NewDebug(utils.USER, name)
defer func() {
debug.Printf("... %s worker finished.", name)
conn.Close()
}()
debug.Printf("%s worker connected to remote address %s", name, conn.RemoteAddr())
// Obtain keys etc.
keyA, e := aeskey.KeyA()
if e != nil {
fmt.Printf("%s AES key error: %v\n", name, e)
return
}
ivA, e := aeskey.IvA()
if e != nil {
fmt.Printf("%s AES IV error: %v\n", name, e)
return
}
keyB, e := aeskey.KeyB()
if e != nil {
fmt.Printf("%s AES key error: %v\n", name, e)
return
}
ivB, e := aeskey.IvB()
if e != nil {
fmt.Printf("%s AES IV error: %v\n", name, e)
return
}
sessionKey, e := aeskey.SessionKey()
if e != nil {
fmt.Printf("%s AES key error: %v\n", name, e)
return
}
//Get input from TCP stream
ibuff := utils.MakeTcpIEncoding(conn)
debug.Printf("Reading nonce N")
nonce, e := ibuff.ReadBinary()
if e != nil {
fmt.Printf("%s Error: %v\n", name, e)
return
}
debug.PrintBuffer(nonce, "Nonce N = ")
debug.Printf("Reading A")
a, e := ibuff.ReadString()
if e != nil {
fmt.Printf("%s Error: %v\n", name, e)
return
}
debug.Printf("A = %v", a)
if a != "student" {
fmt.Printf("Incorrect name for A\n")
return
}
debug.Printf("Reading B")
b, e := ibuff.ReadString()
if e != nil {
fmt.Printf("%s Error: %v\n", name, e)
return
}
debug.Printf("B = %v", b)
if b != "lecturer" {
fmt.Printf("Incorrect name for B\n")
return
}
tokenA, e := ortokens.ReadUserToken(debug, "A", ivA, keyA, ibuff)
if e != nil {
fmt.Printf("%s Error: %v\n", name, e)
return
}
if tokenA.A != a || tokenA.B != b || !bytes.Equal(tokenA.Nonce, nonce) {
fmt.Printf("Invalid token for A\n")
return
}
tokenB, e := ortokens.ReadUserToken(debug, "B", ivB, keyB, ibuff)
if e != nil {
fmt.Printf("%s Error: %v\n", name, e)
return
}
if tokenB.A != a || tokenB.B != b || !bytes.Equal(tokenB.Nonce, nonce) {
fmt.Printf("Invalid token for B\n")
return
}
// Send output to TCP stream
obuff := utils.MakeTcpOEncoding(conn)
e = obuff.WriteBinary(nonce)
if e != nil {
fmt.Printf("%s Error: %v\n", e)
return
}
// Set up & send A's Key Token
var keytokenA ortokens.KeyToken
keytokenA.UserNonce = tokenA.UserNonce[0:]
keytokenA.Key = sessionKey[0:]
e = ortokens.WriteKeyToken(ivA, keyA, &keytokenA, obuff)
if e != nil {
fmt.Printf("%s Error: %v\n", e)
return
}
// Set up & send B's Key Token
var keytokenB ortokens.KeyToken
keytokenB.UserNonce = tokenB.UserNonce[0:]
keytokenB.Key = sessionKey[0:]
e = ortokens.WriteKeyToken(ivB, keyB, &keytokenB, obuff)
if e != nil {
fmt.Printf("%s Error: %v\n", e)
return
}
}