From 4f28892d581e5feefbb1037d602366c50c34b2d4 Mon Sep 17 00:00:00 2001
From: Thomas <toms_91@hotmail.com>
Date: Tue, 8 Oct 2019 11:53:46 +0200
Subject: [PATCH] Week7 init

---
 week7.py | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 week7.py

diff --git a/week7.py b/week7.py
new file mode 100644
index 0000000..c8551e1
--- /dev/null
+++ b/week7.py
@@ -0,0 +1,75 @@
+from secrets import SystemRandom
+
+random = SystemRandom()
+
+'''
+def find_big_odd(k):
+	
+	num = random.getrandbits(k)
+	while num % 2 == 0:
+		num = 
+'''
+
+
+def enc(m, pk):
+	S = 1000
+	c = m + sum(random.sample(pk, S))
+	return c
+
+
+class Alice:
+	def __init__(self, ya, yb, yr):
+		self.ya = ya
+		self.yb = yb
+		self.yr = yr
+		# p is the secret key
+		self.p = random.getrandbits(2000)*2 + 1 # odd integer
+		n = 2000
+		bigInts = [random.getrandbits(10**7) for _ in range(n)]
+		smallInts = [random.getrandbits(60) for _ in range(n)]
+
+		self.pk = [self.p*bigInts[i] + 2*smallInts[i] for i in range(n)]
+		self.cya = enc(ya, self.pk)
+		self.cyb = enc(yb, self.pk)
+		self.cyr = enc(yr, self.pk)
+
+	def send(self):
+		return self.cya, self.cyb, self.cyr, self.pk
+
+	def dec(self, c):
+		m = (c % self.p) % 2
+		return m
+
+
+class Bob:
+	def __init__(self, xa, xb, xr):
+		self.xa = xa
+		self.xb = xb
+		self.xr = xr
+
+	def receive(self, cya, cyb, cyr, pk):
+		self.pk = pk
+
+		# these are ciphered values from alice
+		self.cya = cya
+		self.cyb = cyb
+		self.cyr = cyr
+
+		# these are ciphered values from bob
+		self.cxa = enc(self.xa, pk)
+		self.cxb = enc(self.xb, pk)
+		self.cxr = enc(self.xr, pk)
+
+	def compute_bloodcompatiblity(self):
+
+
+		#f = (1 ^ (self.xa & (1 ^ self.cya))) & (1 ^ (self.xb & (1 ^ self.cyb))) & (1 ^ (self.xr & (1 ^ self.cyr)))
+		#z = enc(f, self.pk)
+		#return z
+		pass
+
+def protocol(donor, recipient):
+	# Alice is recipient
+	alice = Alice(0,1,1)
+	bob = Bob(1,0,0)
+	pass
\ No newline at end of file