// alice implements all the necessary functionality for Alice's part of the
// communication
func alice(msg string, channel chan []*big.Int, conn net.Conn) {
prime := shamir.GeneratePrime(PRIMEBITS)
primeSlice := []*big.Int{prime}
fmt.Printf("Alice generates a prime number:\n%x\n\n",prime)
fmt.Printf("Alice sends the prime number to Bob\n")
channel <- primeSlice
send(channel, conn)
fmt.Println("Alice wants to send the following message: " + msg)
a, aInv := shamir.GenerateExponents(prime)
fmt.Println("Alice computes a secret Exponent and the inverse of it")
fmt.Printf("Alice's secret exponent:\n%x\n", a)
fmt.Printf("Alice's secret inverse:\n%x\n\n", aInv)
fmt.Println("Alice encrypts her message!")
var messageInt []*big.Int = shamir.SliceMessage(msg, prime)
x := shamir.CalculateParallel(messageInt, a, prime)
fmt.Printf("Alice now sends the encrypted message to Bob:\n%x\n\n",shamir.GlueMessage(x))
channel <- x
send(channel, conn)
fmt.Println("Alice is waiting for Bob's answer...")
receive(channel, conn)
x = <-channel
fmt.Println("Alice received the double-encrypted message and is now" +" decrypting her part!")
y := shamir.CalculateParallel(x, aInv, prime)
fmt.Printf("Alice now sends the partly decrypted message to Bob:\n%x\n\n",shamir.GlueMessage(y))
channel <- y
send(channel, conn)
}
// main implements all necessary functionality to setup the conversation
// between Alice and Bob
func main() {
runtimeTest()
var message string
fmt.Print("Please enter the message to be exchanged in encrypted form: ")
reader := bufio.NewReader(os.Stdin)
for {
line, err := reader.ReadString('\n')
if err != nil {
panic(err)
}
message = line
if line != "" || err != nil {
break
}
}
prime := shamir.GeneratePrime(PRIMEBITS)
fmt.Printf("Both Alice and Bob agree on a prime number:\n%x\n\n",
prime)
channel := make(chan []*big.Int)
stop := make(chan int)
go alice(message, prime, channel)
go bob(prime, channel, stop)
<-stop
}
// main implements all necessary functionality to setup the conversation
// between Alice and Bob
func runtimeTest() {
fmt.Println("CPU 's # ", runtime.NumCPU())
prime := shamir.GeneratePrime(PRIMEBITS)
var message string
//fmt.Print(prime, message)
a, aInv := shamir.GenerateExponents(prime)
var time0 time.Time
var duration time.Duration
//var words int
for nCpu := 1; nCpu <= runtime.NumCPU(); nCpu++ {
runtime.GOMAXPROCS(nCpu)
fmt.Println("Using CPU # ", nCpu)
//fmt.Println("\t\t Dauer Normal \t\tDauer Parallel")
for i := 1; i < 5; i++ {
word := math.Pow10(i)
// words = 10 ^ i
var buffer bytes.Buffer
fmt.Print("Chars # ", word*50, "\t\t")
var j float64 = 0
for j = 0; j < word; j++ {
buffer.WriteString("abcdefghijklmnopqrstuvwxzy 1234567890?!, .-#+* ()[]")
}
message = buffer.String()
var messageInt []*big.Int = shamir.SliceMessage(message, prime)
// Normal
time0 = time.Now()
shamir.Calculate(messageInt, a, prime)
duration = time.Since(time0)
fmt.Print(float64(duration.Nanoseconds()) / 1000 / 1000)
// Parrallel
time0 = time.Now()
shamir.CalculateParallel(messageInt, a, prime)
duration = time.Since(time0)
fmt.Print("\t\t", float64(duration.Nanoseconds())/1000/1000)
fmt.Println("")
}
}
var messageInt []*big.Int = shamir.SliceMessage("foo", prime)
x := shamir.CalculateParallel(messageInt, a, prime)
shamir.GlueMessage(x)
shamir.Calculate(x, aInv, prime)
}