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How to use re_encrypt method in localstack
Best Python code snippet using localstack_python
re_enc_primitives1.py
Source:re_enc_primitives1.py 
...11from const import SEED_LENGTH, SYM_KEY_DEFAULT_SIZE12from sym_enc_primitives import sym_decrypt, sym_encrypt13import logging14import random # [WARNING] NOT CRYPTOGRAPHICALLY SECURE15def re_encrypt(data=None, args=None, debug=0):16 """ TODO AGGIORNARE DOCUMENTAZIONE E CONTROLLI VARIABILI17 Re-encrypt the ciphertext using the punctured encryption with new keys.18 :param ciphertext_infile: input file for re-encryption19 :param re_enc_length: number of bytes to re-encrypt20 :param new_pk_file: file where the new public key is stored21 :param policy: string containing the policy to apply to seed and key during encryption22 :param debug: if 1, prints will be shown during execution; default 0, no prints are shown23 :return: the new ciphertext with all the parameters required for decryption24 """25 # Check if data is set26 if data is None:27 logging.error('re_encrypt ciphertext_infile exception')28 if debug: # ONLY USE FOR DEBUG29 print('EXCEPTION in re_encrypt ciphertext_infile')...
securesstable.py
Source:securesstable.py
...39 for i in range(1, n):40 D_i = c1 - c2 - public_key.encrypt(i)41 D.append(D_i)4243 D = [re_encrypt(i) for i in D]44 sigma = np.random.permutation(len(D))45 D = [D[i] for i in sigma]46 for i in range(len(D)):47 if EQ_TEST(D[i], public_key.encrypt(0), private_key) == 1:48 return True4950 return False5152 def re_encrypt(c1):53 temp = public_key.encrypt(0)54 temp = c1 + temp55 return temp5657 def add_1(c1):58 temp = public_key.encrypt(1)59 temp = c1 + temp60 return temp61 ##### INPUT SUBMISSION ############6263 # def gen_prefs(n):64 # l = np.empty([n, n]).astype(int).tolist()65 # for i in range(n):66 # pi = np.random.permutation(n).astype(int).tolist()67 # l[i] = [x for x in pi]68 # return l6970 # men_preferences = gen_prefs(n)71 # women_preferences = gen_prefs(n)72 # print(men_preferences)73 # print(women_preferences)7475 def gen_enc(n, preferences):76 men = dict()77 for i in range(n):78 men[i] = [public_key.encrypt(x) for x in preferences[i]]79 return men8081 men = gen_enc(n, men_preferences)82 women = gen_enc(n, women_preferences)8384 # ##### INPUT SUBMISSION ############8586 # #### ADDITION OF FAKE MEN ########87 # # The matching authorities define an additional n fake men88 for i in range(n, 2*n):89 pi = np.random.permutation(n).tolist()90 men[i] = [public_key.encrypt(x) for x in pi]9192 # # augmented preferences for woman is (i-1) for i in (n+1,2n)93 augment = list(range(n, 2*n))94 augment_ranklist = [public_key.encrypt(x) for x in augment]95 for i in range(0, n):96 women[i].extend(augment_ranklist)9798 # #### ADDITION OF FAKE MEN ########99100 # ######## BID CREATION #########101 bids = dict()102103 def create_bids():104 a = list(range(1, n+1))105106 for i in range(2*n):107 women_pref = []108 for j in range(n):109 women_pref.append(women[j][i])110111 bids[i] = np.array([public_key.encrypt(i+1), np.array(men[i]), np.array([public_key.encrypt(x)112 for x in a]), np.array(women_pref), public_key.encrypt(0)]) # each element of dict is a nparray113114 create_bids()115 Free_bids, Engaged_bids = [], []116 for i in range(n):117 Free_bids.append(bids[i])118 Engaged_bids.append(119 np.array([bids[i+n], public_key.encrypt(i+1), women[i][i+n]]))120121 Free_bids = np.array(Free_bids)122 Engaged_bids = np.array(Engaged_bids)123124 # ######## BID CREATION #########125126 ###### Initial Mixing #########127 pi = np.random.permutation(n)128129 def pi_per(ciphers):130 ciphers = np.apply_along_axis(lambda x: re_encrypt(x), 0, ciphers)131 ciphers = ciphers[pi]132 return ciphers133134 def External_Mix_Free(bids):135 if len(bids) == 0:136 return bids137138 for i in range(len(bids)):139 bids[i] = np.array([re_encrypt(bids[i][0]), np.array(np.apply_along_axis(lambda x: re_encrypt(x), 0, bids[i][1])), np.array(140 np.apply_along_axis(lambda x: re_encrypt(x), 0, bids[i][2])), np.array(np.apply_along_axis(lambda x: re_encrypt(x), 0, bids[i][3])), re_encrypt(bids[i][4])])141142 sigma = np.random.permutation(len(bids))143 bids = bids[sigma]144 return bids145146 def Internal_Mix_Free(bids):147 if len(bids) == 0:148 return bids149150 for i in range(len(bids)):151 bids[i] = np.array([bids[i][0], pi_per(bids[i][1]), pi_per(152 bids[i][2]), pi_per(bids[i][3]), bids[i][4]])153 return bids154155 def External_Mix_Engaged(bids):156 if len(bids) == 0:157 return bids158159 for i in range(len(bids)):160 bids[i] = np.array([np.array([re_encrypt(bids[i][0][0]), np.array(np.apply_along_axis(lambda x: re_encrypt(x), 0, bids[i][0][1])), np.array(np.apply_along_axis(161 lambda x: re_encrypt(x), 0, bids[i][0][2])), np.array(np.apply_along_axis(lambda x: re_encrypt(x), 0, bids[i][0][3])), re_encrypt(bids[i][0][4])]), re_encrypt(bids[i][1]), re_encrypt(bids[i][2])])162163 sigma = np.random.permutation(len(bids))164 bids = bids[sigma]165 return bids166167 def Internal_Mix_Engaged(bids):168 if len(bids) == 0:169 return bids170171 for i in range(len(bids)):172 bids[i] = np.array([np.array([bids[i][0][0], pi_per(bids[i][0][1]), pi_per(173 bids[i][0][2]), pi_per(bids[i][0][3]), bids[i][0][4]]), bids[i][1], bids[i][2]])174 return bids175176 ###### Initial Mixing #########177 Free_bids = External_Mix_Free(Free_bids)178 Engaged_bids = External_Mix_Engaged(Engaged_bids)179 Free_bids = Internal_Mix_Free(Free_bids)180 Engaged_bids = Internal_Mix_Engaged(Engaged_bids)181182 FREE_BIDS = {1: Free_bids}183 ENGAGED_BIDS = {1: Engaged_bids}184185 ######### Computing a stable match ###########186 for i in range(2, n+2):187 FREE_BIDS[i] = None188 ENGAGED_BIDS[i] = None189 ###########################190191 for k in range(1, n+1):192 while len(FREE_BIDS[k]) > 0:193 ind = random.randrange(0, len(FREE_BIDS[k]))194 bid = FREE_BIDS[k][ind]195 FREE_BIDS[k] = np.delete(FREE_BIDS[k], ind, 0)196197 index = INDEX(bid[1], bid[4], private_key)198 E_j = bid[2][index]199 E_sji = bid[3][index]200201 for i in range(len(ENGAGED_BIDS[k])):202 if EQ_TEST(E_j, ENGAGED_BIDS[k][i][1], private_key) == 1:203 conflict_bid = ENGAGED_BIDS[k][i]204 ENGAGED_BIDS[k] = np.delete(ENGAGED_BIDS[k], i, 0)205 break206207 new_engaged_bid = np.array([np.array(bid), E_j, E_sji])208209 temp_Engaged_bids = np.array([new_engaged_bid, conflict_bid])210 # temp_Engaged_bids=External_Mix_Engaged(temp_Engaged_bids)211 result = COMPARE(212 temp_Engaged_bids[0][2], temp_Engaged_bids[1][2], private_key, 2*n)213214 if not result:215216 ENGAGED_BIDS[k] = np.append(217 ENGAGED_BIDS[k], [temp_Engaged_bids[0]], axis=0)218219 w1 = temp_Engaged_bids[1][0]220 w1[4] = add_1(w1[4])221222 if FREE_BIDS[k+1] is None:223 FREE_BIDS[k+1] = np.array([w1])224 else:225 FREE_BIDS[k+1] = np.append(FREE_BIDS[k+1], [w1], axis=0)226227 else:228229 ENGAGED_BIDS[k] = np.append(230 ENGAGED_BIDS[k], [temp_Engaged_bids[1]], axis=0)231 w1 = temp_Engaged_bids[0][0]232 w1[4] = add_1(w1[4])233 if FREE_BIDS[k+1] is None:234 FREE_BIDS[k+1] = np.array([w1])235236 else:237 FREE_BIDS[k+1] = np.append(FREE_BIDS[k+1], [w1], axis=0)238 ####################239240 ENGAGED_BIDS[k] = External_Mix_Engaged(ENGAGED_BIDS[k])241 ENGAGED_BIDS[k] = Internal_Mix_Engaged(ENGAGED_BIDS[k])242 FREE_BIDS[k] = Internal_Mix_Free(FREE_BIDS[k])243 FREE_BIDS[k+1] = Internal_Mix_Free(FREE_BIDS[k+1])244245 ENGAGED_BIDS[k+1] = ENGAGED_BIDS[k]246247 FREE_BIDS[k+1] = External_Mix_Free(FREE_BIDS[k+1])248 ENGAGED_BIDS[k+1] = External_Mix_Engaged(ENGAGED_BIDS[k+1])249 FREE_BIDS[k+1] = Internal_Mix_Free(FREE_BIDS[k+1])250 ENGAGED_BIDS[k+1] = Internal_Mix_Engaged(ENGAGED_BIDS[k+1])251252 ######### Computing a stable match ###########253254 ############# Decryption ###########255 pairs = []256 for bid in ENGAGED_BIDS[n+1]:257 pairs.append([bid[0][0], bid[1]])258259 for pair in pairs:260 pair = [re_encrypt(pair[0]), re_encrypt(pair[1])]261 sigma = np.random.permutation(len(pairs))262 pairs = [pairs[i] for i in sigma]263264 #########Decryption ################265 for i in range(len(pairs)):266 pairs[i] = [private_key.decrypt(267 pairs[i][0]), private_key.decrypt(pairs[i][1])]268 return pairs269# print(pairs)270st.set_page_config(layout="centered") 271st.title('Secure Stable Matching ')272n = st.slider('Enter the number the participants', 0, 50, 1)273st.write('Number of participants chosen: ',n)274
...
pre_nal16.py
Source:pre_nal16.py
...26 >>> (pk_b, sk_b) = pre.keygen(params)27 >>> msg = groupObj.random(GT)28 >>> c_a = pre.encrypt(params, pk_a, msg)29 >>> rk = pre.rekeygen(params, pk_a, sk_a, pk_b, sk_b)30 >>> c_b = pre.re_encrypt(params, rk, c_a)31 >>> assert msg == pre.decrypt(params, sk_b, c_b), 'Decryption of re-encrypted ciphertext was incorrect'32 """33 34 def __init__(self, groupObj):35 global group36 group = groupObj37 38 def F(self, params, t):39 return (params['u'] ** t) * params['v']40 def setup(self):41 g, u, v = group.random(G1), group.random(G1), group.random(G1)42 Z = pair(g,g)43 params = {'g': g, 'u': u, 'v': v, 'Z': Z} 44 if(debug):45 print("Setup: Public parameters...")46 group.debug(params)47 return params48 def keygen(self, params):49 x = group.random(ZR)50 g_x = params['g'] ** x51 sk = x # { 'sk' : x }52 pk = g_x # { 'pk' : g_x }53 if(debug):54 print('\nKeygen...')55 print("pk => '%s'" % pk)56 print("sk => '%s'" % sk)57 return (pk, sk)58 def rekeygen(self, params, pk_a, sk_a, pk_b, sk_b):59 rk = pk_b ** (~sk_a)60 if(debug):61 print('\nReKeyGen...')62 print("rk => '%s'" % rk)63 return rk64 def encrypt(self, params, pk, m):65 #m = group.encode(M, GT)66 r1, r2 = group.random(ZR), group.random(ZR)67 68 c0 = self.F(params, r1) ** r269 c1 = m * (params['Z'] ** r2)70 c2 = pk ** r271 c = {'c0': c0, 'c1': c1, 'c2': c2}72 73 if(debug):74 print('\nEncrypt...')75 print('m => %s' % m)76 print('r1 => %s' % r1)77 print('r2 => %s' % r2)78 print('c => %s' % c)79 group.debug(c)80 return c 81 82 def decrypt(self, params, sk, c):83 84 c1 = c['c1'] 85 c2 = c['c2']86 m = c1 / (c2 ** (~sk))87 88 if(debug):89 print('\nDecrypt...')90 print('m => %s' % m)91 #return group.decode(m)92 return m93 94 def re_encrypt(self, params, rk, c_a):95 c2 = c_a['c2']96 c_b = c_a97 c_b['c2'] = pair(c2, rk)98 99 if(debug):100 print('\nRe-encrypt...')101 print('c\' => %s' % c_b)102 return c_b103class NAL16b(NAL16a):104 """105 Testing NAL16 implementation 106 >>> from charm.toolbox.pairinggroup import PairingGroup,ZR,G1,G2,GT,pair107 >>> groupObj = PairingGroup('SS512')108 >>> pre = NAL16b(groupObj)109 >>> params = pre.setup()110 >>> (pk_a, sk_a) = pre.keygen(params)111 >>> (pk_b, sk_b) = pre.keygen(params)112 >>> msg = b"Hello world!"113 >>> c_a = pre.encrypt(params, pk_a, msg)114 >>> rk = pre.rekeygen(params, pk_a, sk_a, pk_b, sk_b)115 >>> c_b = pre.re_encrypt(params, rk, c_a)116 >>> assert msg == pre.decrypt(params, sk_b, c_b), 'Decryption of re-encrypted ciphertext was incorrect'117 """118 def __init__(self, groupObj):119 global group, h120 group = groupObj121 h = Hash(group)122 def H(self, gt, s):123 h1 = group.hash((gt, s, 1), ZR)124 h2 = group.hash((gt, s, 2), ZR)125 if(debug):126 print('\nH ...')127 print("gt => '%s'" % gt)128 print("s => '%s'" % s)129 print("h1 => '%s'" % h1)130 print("h2 => '%s'" % h2)131 return (h1, h2)132 def G(self, x):133 hh = h.hashToZn(x)134 if(debug):135 print('\nG ...')136 print("x => '%s'" % x)137 print("G(x) => '%s'" % hh)138 return hh139 def encrypt(self, params, pk, m):140 sigma = group.random(GT)141 c3 = self.G(sigma) ^ integer(m)142 (r1, r2) = self.H(sigma, c3)143 c = super(NAL16b, self).encrypt(params, pk, sigma)144 c['c3'] = c3145 146 if(debug):147 print('\nEncrypt...')148 print('m => %s' % m)149 print('r1 => %s' % r1)150 print('r2 => %s' % r2)151 print('c => %s' % c)152 group.debug(c)153 return c 154 def decrypt(self, params, sk, c):155 sigma = super(NAL16b, self).decrypt(params, sk, c)156 c3 = c['c3']157 (r1, r2) = self.H(sigma, c3)158 m = int2Bytes(c3 ^ self.G(sigma))159 160 if(debug):161 print('\nDecrypt...')162 print('m => %s' % m)163 return m164 def re_encrypt(self, params, rk, c_a):165 c_b = super(NAL16b, self).re_encrypt(params, rk, c_a)166 c_b['c3'] = c_a['c3']167 if(debug):168 print('\nRe-encrypt...')169 print('c\' => %s' % c_b)170 return c_b171# groupObj = PairingGroup('SS512')172# pre = NAL16b(groupObj)173# params = pre.setup()174# (pk_a, sk_a) = pre.keygen(params)175# (pk_b, sk_b) = pre.keygen(params)176# msg = b"Hello world!"177# c_a = pre.encrypt(params, pk_a, msg)178# rk = pre.rekeygen(params, pk_a, sk_a, pk_b, sk_b)179# c_b = pre.re_encrypt(params, rk, c_a)...
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