def sk_exchange_robot(ip):
print "Generating and exchanging session key..."
#SK1
private_key, public_key = crypto.keypair()
#SK2#
port = 21567
client_public_key = socket_scripts.socket_host(port)
#SK3#
session_key = crypto.generate_session_key()
#SK4#
encrypted_session_key = crypto.session_key_encrypt(client_public_key, session_key)
#SK5#
#ip = "192.168.1.2"
port = 21568
socket_scripts.socket_client(ip, port, encrypted_session_key)
print "Login Session key = ", session_key
return session_key
def sk_exchange_client(ip):
print "Generating and exchanging session key..."
#SK1#
private_key, public_key = crypto.keypair()
#SK2#
#ip = "192.168.1.2"
#time.sleep(10)
port = 21567
socket_scripts.socket_client(ip, port, public_key)
#SK5#
port = 21568
#time.sleep(2)
encrypted_session_key = socket_scripts.socket_host(port)
#SK6#
session_key = crypto.session_key_decrypt(private_key,
encrypted_session_key)
print "Login Session key = ", session_key
return session_key
def authentication_client(ip, port):
attempt_status = ""
# Starts a while loop that terminates once the authentication server has failed
# or succeded.
while not (attempt_status == "success" or attempt_status == "failed"):
# The user enters the string shown by the server and sends the value
# via socket. The client then waits for a response as to whether the
# entered code was correct
user_attempt = raw_input(
"Please enter the 5 digit authentication string displayed on the server terminal\n"
)
socket_scripts.socket_client(ip, port, user_attempt)
attempt_status = socket_scripts.socket_host(port)
# Displays a message to the user informing them whether the authentication
# was sucessful, failed or was wrong and needs to be attempted again
if attempt_status == "success":
print "Authentication Succeeded"
elif attempt_status == "retry":
print "Login Code Incorrect. Please try again"
elif attempt_status == "failed":
print "Authentication Failed!!!\nPlease restart the program and try again"
print "\n"
return attempt_status
def RSA_server(ip, port):
print "Generating and exchanging session key..."
#SK1
private_key, public_key = crypto.keypair()
#SK2#
#port = 21566
client_public_key = socket_scripts.socket_host(port)
#SK3#
session_key = crypto.generate_session_key()
#SK4#
encrypted_session_key = crypto.session_key_encrypt(client_public_key,
session_key)
#SK5#
#ip = "192.168.1.2"
#port = 21567
socket_scripts.socket_client(ip, port, encrypted_session_key)
print "Session key = ", session_key
return session_key
def authentication_server(ip, port):
print "An authentication code will be displayed on this terminal."
print "Within 30 seconds enter the same code on the client terminal to authenticate the client"
raw_input("\nPress enter to display the authentication code...\n")
# Calls the function dedicated to generating the authentication code,
# saves the code to a variable and displays it on the terminal window
# for the client to copy and input
authentication_string = generate_authentication_string()
print "The authentication string is:\n\n", authentication_string
print "\n\nPlease enter this string on the client terminal within 30 seconds"
# Defines the number of permitted login attempts allowed
login_attempts = 3
attempt_status = ""
# Starts a while loop which terminates when the client runs out of
# login attempts and the recieved client authentication code does
# not match the one stored by the server
while (login_attempts > 0) and (not (attempt_status == "success")):
# Sets up the socket ready to recieve the code from the client
attempt_data = socket_scripts.socket_host(port)
# Checks to see whether the client code inputted matches the
# correct serverside value and stores this status in a variable.
# If the attempt fails the login attempt value reduces by one.
# If the inputted code is incorrect and the the amount of remaining
# attempts are zero then the status fails whereas if there are
# attempts remaining the status is set to retry
if attempt_data == authentication_string:
attempt_status = "success"
print "Authentication Succeeded"
# Sends the attempt status to the client via socket
socket_scripts.socket_client(ip, port, attempt_status)
else:
login_attempts = login_attempts - 1
if login_attempts == 0:
attempt_status = "failed"
print "Authentication Failed!!!\nPlease restart the program and try again"
else:
attempt_status = "retry"
print "Login Code Incorrect!\nAttempts Remaining = ", login_attempts
# Sends the attempt status to the client via socket
socket_scripts.socket_client(ip, port, attempt_status)
print "\n"
return attempt_status
def RSA_client(ip, port):
print "Generating and exchanging session key..."
#SK1#
private_key, public_key = crypto.keypair()
#SK2#
#port = 21566
socket_scripts.socket_client(ip, port, public_key)
#SK5#
#port = 21567
encrypted_session_key = socket_scripts.socket_host(port)
#SK6#
session_key = crypto.session_key_decrypt(private_key,
encrypted_session_key)
print "Session key = ", session_key
return session_key