def encrypt(self, i_pk, o_pk, M : G1):
r, s = group.random(ZR, 2)
Y = o_pk['pk'] ** r
W = o_pk['h'] ** r
S = i_pk['g'] ** s
F = e(S, Y)
H = o_pk['h'] ** s
G = e(S, W) * e(M, H)
return { 'F':F, 'G':G, 'H':H }
def encrypt(self, i_pk, o_pk, M: G1):
r, s = group.random(ZR, 2)
Y = o_pk['pk']**r
W = o_pk['h']**r
S = i_pk['g']**s
F = e(S, Y)
H = o_pk['h']**s
G = e(S, W) * e(M, H)
return {'F': F, 'G': G, 'H': H}
def decrypt(self, a, ct, M : [G1]):
F, G, H = ct['F'], ct['G'], ct['H']
Q = G * (F ** -(1 / a))
for m in M:
if e(m, H) == Q: return m
return False
def decrypt(self, a, ct, M: [G1]):
F, G, H = ct['F'], ct['G'], ct['H']
Q = G * (F**-(1 / a))
for m in M:
if e(m, H) == Q: return m
return False
