Ejemplo n.º 1
0
// bob implements all the necessary functionality for Bob's part of the
// communication
func bob(channel chan []*big.Int, stop chan int, conn net.Conn) {

	fmt.Printf("Bob is waiting for a prime number from Alice...")
	receive(channel, conn)
	primeSlice := <-channel

	prime := primeSlice[0]
	if !(*prime).ProbablyPrime(4) {
		fmt.Printf("Alice prime number is probably not prime")
	}
	fmt.Println("Bob is waiting for the encrypted message from Alice...")
	receive(channel, conn)
	x := <-channel
	b, bInv := shamir.GenerateExponents(prime)
	fmt.Println("Bob computes a secret Exponent and the inverse of it")
	fmt.Printf("Bob's secret exponent:\n%x\n", b)
	fmt.Printf("Bob's secret inverse:\n%x\n\n", bInv)
	fmt.Println("Bob received the encrypted message from Alice and is now" + " encrypting it too!")
	y := shamir.CalculateParallel(x, b, prime)
	fmt.Printf("Bob now sends the double-encrypted message back to "+"Alice:\n%x\n\n", shamir.GlueMessage(y))
	channel <- y
	send(channel, conn)
	fmt.Println("Bob is waiting for Alice's answer...")
	receive(channel, conn)
	x = <-channel
	fmt.Println("Bob received the second message from Alice and is now " + "decrypting it!")
	y = shamir.CalculateParallel(x, bInv, prime)
	fmt.Println("Bob decrypted the following message from Alice: " + shamir.GlueMessage(y))

	stop <- 1
}
Ejemplo n.º 2
0
func send(channel chan []*big.Int, conn net.Conn) {
	_, err := conn.Write([]byte(shamir.GlueMessage(<-channel)))
	checkError(err)
}