// 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
}
func send(channel chan []*big.Int, conn net.Conn) {
_, err := conn.Write([]byte(shamir.GlueMessage(<-channel)))
checkError(err)
}