def encrypt(self, mpk, ID, msg):
s, s1, s2 = group.random(ZR, 3)
hID = self.strToId(mpk, ID)
hashID1 = mpk['g_l'][0] * dotprod2(range(1,mpk['n']), lam_func, mpk['g_l'], hID)
c = {}
c_pr = (mpk['omega'] ** s) * msg
c[0] = hashID1 ** s
c[1] = mpk['v1'] ** (s - s1)
c[2] = mpk['v2'] ** s1
c[3] = mpk['v3'] ** (s - s2)
c[4] = mpk['v4'] ** s2
return {'c':c, 'c_prime':c_pr }
def extract(self, mpk, msk, ID):
r1, r2 = group.random(ZR, 2) # should be params of extract
hID = self.strToId(mpk, ID)
hashID2 = mpk['h_l'][0] * dotprod2(range(1,mpk['n']), lam_func, mpk['h_l'], hID)
d = {}
d[0] = mpk['h'] ** ((r1 * msk['t1'] * msk['t2']) + (r2 * msk['t3'] * msk['t4']))
d[1] = (mpk['h'] ** (-msk['alpha'] * msk['t2'])) * (hashID2 ** (-r1 * msk['t2']))
d[2] = (mpk['h'] ** (-msk['alpha'] * msk['t1'])) * (hashID2 ** (-r1 * msk['t1']))
d[3] = hashID2 ** (-r2 * msk['t4'])
d[4] = hashID2 ** (-r2 * msk['t3'])
return { 'd':d }
def transform(pk, skBlinded, ct):
input = [pk, skBlinded, ct]
policy_str, Ctl, C, Cr, Cpr, T1 = ct
S, D, Dj, Djp = skBlinded
policy = createPolicy(policy_str)
attrs = prune(policy, S)
coeff = getCoefficients(policy)
Y = len(attrs)
lam_func1 = lambda a, b, c, d, e, f: (pair((b[a] ** -c[a]), d[a]) * pair((e[a] ** c[a]), f[a]))
A = dotprod2(range(0, Y), lam_func1, attrs, Cr, coeff, Dj, Djp, Cpr)
result0 = pair(C, D) * A
T0 = Ctl
T2 = result0
partCT = [T0, T1, T2]
output = partCT
return output
def transform(pk, sk, ct): input = [pk, sk, ct] policy_str, Ctl, C, Cr, Cpr, T1 = ct S, D, Dj, Djp = sk policy = createPolicy(policy_str) attrs = prune(policy, S) coeff = getCoefficients(policy) Y = len(attrs) lam_func1 = lambda a,b,c,d,e,f: (pair((b[a] ** -c[a]), d[a]) * pair((e[a] ** c[a]), f[a])) A = dotprod2(range(0, Y), lam_func1, attrs, Cr, coeff, Dj, Djp, Cpr) result0 = (pair(C, D) * A) T0 = Ctl T2 = result0 partCT = [T0, T1, T2] output = partCT return output
def transform(ct):
input = [pk, skBlinded, ct]
policy_str, Ctl, C, Cr, Cpr, T1 = ct
S, D, Dj, Djp = skBlinded
policy = createPolicy(policy_str)
attrs = prune(policy, S)
coeff = getCoefficients(policy)
Y = len(attrs)
A = dotprod2(range(0,Y), transformLambdaFunc, attrs, Cr, coeff, Dj, Djp, Cpr)
print(" A := ", A)
result0 = (pair(C, D) * A)
T0 = Ctl
T2 = result0
print("T2 :=>", result0)
partCT = {'T0':T0, 'T1':T1, 'T2':T2}
output = partCT
return output
def transform(ct):
input = [pk, skBlinded, ct]
policy_str, Ctl, C, Cr, Cpr, T1 = ct
S, D, Dj, Djp = skBlinded
policy = createPolicy(policy_str)
attrs = prune(policy, S)
coeff = getCoefficients(policy)
Y = len(attrs)
A = dotprod2(range(0, Y), transformLambdaFunc, attrs, Cr, coeff, Dj, Djp,
Cpr)
print(" A := ", A)
result0 = (pair(C, D) * A)
T0 = Ctl
T2 = result0
print("T2 :=>", result0)
partCT = {'T0': T0, 'T1': T1, 'T2': T2}
output = partCT
return output