def encrypt(M, policy_str):
global Y
global s
global attrs
global sh
global share
global Cr
global Cpr
input = [pk, M, policy_str]
g, g2, h, f, egg = pk
policy = createPolicy(policy_str)
attrs = getAttributeList(policy)
R = groupObj.random(GT)
print("R :=", R)
s = groupObj.hash([R, M], ZR)
s_sesskey = SHA1(R)
print("s_sesskey :=", s_sesskey)
Ctl = (R * (egg ** s))
sh = calculateSharesDict(s, policy)
Y = len(sh)
C = (h ** s)
for y in range(0, Y):
y1 = attrs[y]
share[y1] = sh[y1]
Cr[y1] = (g ** share[y1])
Cpr[y1] = (groupObj.hash(y1, G2) ** share[y1])
T1 = SymEnc(s_sesskey, M)
ct = [policy_str, Ctl, C, Cr, Cpr, T1]
output = ct
return output
def encrypt(M, policy_str):
global Y
global s
global attrs
global sh
global share
global Cr
global Cpr
input = [pk, M, policy_str]
g, g2, h, f, egg = pk
policy = createPolicy(policy_str)
attrs = getAttributeList(policy)
R = groupObj.random(GT)
print("R :=", R)
s = groupObj.hash([R, M], ZR)
s_sesskey = SHA1(R)
print("s_sesskey :=", s_sesskey)
Ctl = (R * (egg**s))
sh = calculateSharesDict(s, policy)
Y = len(sh)
C = (h**s)
for y in range(0, Y):
y1 = attrs[y]
share[y1] = sh[y1]
Cr[y1] = (g**share[y1])
Cpr[y1] = (groupObj.hash(y1, G2)**share[y1])
T1 = SymEnc(s_sesskey, M)
ct = [policy_str, Ctl, C, Cr, Cpr, T1]
output = ct
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
