def handle(self):
global email
global password
conn = challenge34_shared.Conn(self)
print('S: reading email...')
readEmail = conn.readline()
print('S: reading A...')
A = conn.readnum()
print('S: writing salt...')
conn.writenum(salt)
b = random.randint(0, N)
B = (pow(g, b, N) + k*v) % N
print('S: writing B...')
conn.writenum(B)
u = challenge36_util.hashToInt(str(A) + str(B))
S = pow(pow(v, u, N) * A, b, N)
K = challenge36_util.hashToBytes(str(S))
server_hmac = challenge36_util.hmac(salt, K)
print('S: reading hmac...')
client_hmac = conn.readbytes()
if client_hmac == server_hmac:
print('S: writing success...')
conn.writeline(b'OK')
else:
conn.writeline(b'NOT OK')
def handle(self):
global email
global password
conn = challenge34_shared.Conn(self)
print('S: reading email...')
readEmail = conn.readline()
print('S: reading A...')
A = conn.readnum()
print('S: writing salt...')
conn.writenum(salt)
print('S: writing B...')
conn.writenum(B)
print('S: writing u...')
conn.writenum(u)
print('S: reading hmac...')
client_hmac = conn.readbytes()
print('S: writing success...')
conn.writeline(b'OK')
print('A:', A)
print('client_hmac:', base64.b64encode(client_hmac))
def handle(self):
conn = challenge34_shared.Conn(self)
print('S: reading p...')
p = conn.readnum()
print('S: reading g...')
g = conn.readnum()
print('S: writing p...')
conn.writenum(p)
print('S: writing g...')
conn.writenum(g)
print('S: reading A...')
A = conn.readnum()
b = random.randint(0, p)
B = pow(g, b, p)
print('S: writing B...')
conn.writenum(B)
s = pow(A, b, p)
key = challenge34_shared.derivekey(s)
print('S: reading encrypted message...')
encrypted_message = conn.readbytes()
print('S: reading iv...')
iv = conn.readbytes()
message = challenge34_shared.decrypt(key, iv, encrypted_message)
print('S: message:', message)
encrypted_message2 = challenge34_shared.encrypt(key, iv, message)
if encrypted_message2 != encrypted_message:
raise Exception(encrypted_message2 + b' != ' + encrypted_message)
print('S: writing encrypted message...')
conn.writebytes(encrypted_message2)
def handle(self):
global targethost
global targetport
global targetg
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect((targethost, targetport))
serverconn = challenge34_shared.Conn(sock)
clientconn = challenge34_shared.Conn(self)
print('C->A: reading p...')
p = clientconn.readnum()
print('C->A: reading g...')
g = clientconn.readnum()
print('A->S: writing p...')
serverconn.writenum(p)
if targetg > 0:
fakeg = 1
elif targetg < 0:
fakeg = p - 1
else:
fakeg = p
print('A->S: writing fake g...')
serverconn.writenum(fakeg)
print('S->A: reading p...')
serverconn.readnum()
print('S->A: reading g...')
serverconn.readnum()
print('A->C: writing p...')
clientconn.writenum(p)
print('A->C: writing fake g...')
clientconn.writenum(fakeg)
print('C->A: reading A...')
A = clientconn.readnum()
print('A->S: writing A...')
serverconn.writenum(A)
print('S->A: reading B...')
B = serverconn.readnum()
print('A->C: writing B...')
clientconn.writenum(B)
print('C->A: reading encrypted message...')
encrypted_message = clientconn.readbytes()
print('A->S: writing encrypted message...')
serverconn.writebytes(encrypted_message)
print('C->A: reading iv...')
iv = clientconn.readbytes()
print('A->S: writing iv...')
serverconn.writebytes(iv)
print('S->A: reading encrypted message...')
encrypted_message2 = serverconn.readbytes()
print('A->C: writing encrypted message...')
clientconn.writebytes(encrypted_message2)
print('S->A: reading iv...')
iv2 = serverconn.readbytes()
print('A->C: writing iv...')
clientconn.writebytes(iv2)
if targetg > 0:
s = 1
elif targetg < 0:
if A == p - 1 and B == p - 1:
s = p - 1
else:
s = 1
else:
s = 0
key = challenge34_shared.derivekey(s)
message = challenge34_shared.decrypt(key, iv, encrypted_message)
print('A: message: ' + message)
finally:
sock.close()
host = sys.argv[1]
port = int(sys.argv[2])
email = sys.argv[3]
password = sys.argv[4]
N = 0xffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67cc74020bbea63b139b22514a08798e3404ddef9519b3cd3a431b302b0a6df25f14374fe1356d6d51c245e485b576625e7ec6f44c42e9a637ed6b0bff5cb6f406b7edee386bfb5a899fa5ae9f24117c4b1fe649286651ece45b3dc2007cb8a163bf0598da48361c55d39a69163fa8fd24cf5f83655d23dca3ad961c62f356208552bb9ed529077096966d670c354e4abc9804f1746c08ca237327ffffffffffffffff
g = 2
k = 3
a = random.randint(0, N)
A = pow(g, a, N)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect((host, port))
conn = challenge34_shared.Conn(sock)
print('C: writing email...')
conn.writeline(email.encode('ascii'))
print('C: writing A...')
conn.writenum(A)
print('C: reading salt...')
salt = conn.readnum()
print('C: reading B...')
B = conn.readnum()
print('C: reading u...')
u = conn.readnum()
def handle(self):
global targethost
global targetport
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect((targethost, targetport))
serverconn = challenge34_shared.Conn(sock)
clientconn = challenge34_shared.Conn(self)
print('C->A: reading p...')
p = clientconn.readnum()
print('C->A: reading g...')
g = clientconn.readnum()
print('C->A: reading A...')
A = clientconn.readnum()
print('A->S: writing p...')
serverconn.writenum(p)
print('A->S: writing g...')
serverconn.writenum(g)
print('A->S: writing p...')
serverconn.writenum(p)
print('S->A: reading B...')
B = serverconn.readnum()
print('A->C: writing p...')
clientconn.writenum(p)
print('C->A: reading encrypted message...')
encrypted_message = clientconn.readbytes()
print('A->S: writing encrypted message...')
serverconn.writebytes(encrypted_message)
print('C->A: reading iv...')
iv = clientconn.readbytes()
print('A->S: writing iv...')
serverconn.writebytes(iv)
print('S->A: reading encrypted message...')
encrypted_message2 = serverconn.readbytes()
print('A->C: writing encrypted message...')
clientconn.writebytes(encrypted_message2)
print('S->A: reading iv...')
iv2 = serverconn.readbytes()
print('A->C: writing iv...')
clientconn.writebytes(iv2)
key = challenge34_shared.derivekey(0)
message = challenge34_shared.decrypt(key, iv, encrypted_message)
print('A: message: ' + message)
finally:
sock.close()