def encrypt(file, save_as, schema, base_path):
if schema == 'AES':
pickle_in = open(base_path + 'en-de/aes.p', 'rb')
passwd = pickle.load(pickle_in)
pickle_in.close()
AES.encrypt_AES(file, passwd, save_as)
elif schema == 'RSA':
RSA.encrypt_RSA(file, save_as, base_path)
elif schema == 'DES':
pickle_in = open(base_path + 'en-de/des.p', 'rb')
passwd = pickle.load(pickle_in)
pickle_in.close()
DES.encrypt_DES(file, passwd, save_as)
elif schema == 'BF':
pickle_in = open(base_path + 'en-de/bf.p', 'rb')
#print(base_path)
passwd = pickle.load(pickle_in)
pickle_in.close()
bf.encrypt_bf(file, passwd, save_as)
else:
print('pending')
sys.exit(2)
def f1(key_in_hex, text_in_bin):
key = key_in_hex
hash = MD5.new()
message = text_in_bin.encode('utf-8')
hash.update(message)
hash_md5 = hash.hexdigest()
### hash_md5 be like 3c1898a00cc4579728e1268191a64bc6
hash_bin = bin(int(hash_md5, 16))[2:].zfill(128)
### hash_bin be like 00111100000110001001100010100000000011001...., type = str
first_half = int(hash_bin[:64], 2)
second_half = int(hash_bin[64:], 2)
inner_des = DES.encrypt_DES(key, hex(first_half)[2:]) ### hex value
final_input = int(inner_des, 16) ^ second_half
result = DES.encrypt_DES(key, hex(final_input)[2:])
return int(result, 16)
def encrypt_message(key_tag, D):
R = randomize_blocks(D)
# print("Type R[0] ",type(R[0]))
h = 0
l = len(R)
for i in range(l - 1):
h = h ^ f1(hex(int(R[i], 2))[2:], R[i + 1])
h = h ^ f1(hex(int(R[l - 1], 2))[2:], R[0])
# print("Line 47 h without 0 and 1 ",h^f1( hex(int(R[0],2))[2:] , R[1]))
# print("Line 48 h without 0 and 1 ",h^f1( hex(int(R[0],2))[2:] , R[1]))
tag = DES.encrypt_DES(key_tag, hex(h))
return tag, hex(h)
def incremental_update_genrate_hash(key_tag, tag,
indices_to_update_list_sorted,
original_message_list,
updated_messages_list_ac_indices):
### TAG IS OF STR TYPE
### 2nd argument should be str type
h = DES.decrypt_DES(key_tag, tag)
print("From em module line 56 h we have decrypted", h)
h = int(h, 16)
R = randomize_blocks(original_message_list)
R_new = randomize_blocks(updated_messages_list_ac_indices)
### str type
N = len(R)
#visited =[0]*N
nb = len(indices_to_update_list_sorted)
for i in range(nb):
j = indices_to_update_list_sorted[i]
if (j != 0 & j != N - 1):
h = h ^ f1(hex(int(R[j], 2))[2:], R[j + 1]) ^ f1(
hex(int(R[j - 1], 2))[2:], R[j])
R[j] = R_new[i]
h = h ^ f1(hex(int(R[j], 2))[2:], R[j + 1]) ^ f1(
hex(int(R[j - 1], 2))[2:], R[j])
if (j == 0):
h = h ^ f1(hex(int(R[0], 2))[2:], R[1]) ^ f1(
hex(int(R[N - 1], 2))[2:], R[0])
R[j] = R_new[i]
h = h ^ f1(hex(int(R[0], 2))[2:], R[1]) ^ f1(
hex(int(R[N - 1], 2))[2:], R[0])
if (j == N - 1):
h = h ^ f1(hex(int(R[N - 2], 2))[2:], R[N - 1]) ^ f1(
hex(int(R[N - 1], 2))[2:], R[0])
R[j] = R_new[i]
h = h ^ f1(hex(int(R[N - 2], 2))[2:], R[N - 1]) ^ f1(
hex(int(R[N - 1], 2))[2:], R[0])
tag_updated = DES.encrypt_DES(key_tag, hex(h))
return tag_updated, hex(h)