def CEupload(file_name):
# Upload a file with convergent encryption (using the file's hash as its key).
remote_file_name = base64.urlsafe_b64encode(enc.siv_encrypt(pbkey1, pbkey2, file_name, ""))
content_file_name = remote_file_name + '.contents'
key_file_name = remote_file_name + '.key'
s = open(file_name, 'rb').read()
key = hashlib.sha256(s).digest()[0:16]
# print "key: " + key
c1 = enc.encrypt(key, s)
temp_contents = open("./tempc", "wb")
temp_contents.write(c1)
temp_contents.close()
temp_contents = open("./tempc", "rb")
hash_r = hmac.new(pbkey3, c1+remote_file_name+key, hashlib.sha256).digest()
c2 = enc.encrypt(pbkey4, key + hash_r)
temp_key = open("./tempk", "wb")
temp_key.write(c2)
temp_key.close()
temp_key = open("./tempk", "rb")
up_thread = Thread(
target=dpbx_client.put_file, args=(content_file_name, temp_contents, True) )
up_thread.start()
dpbx_client.put_file(key_file_name, temp_key, True)
up_thread.join()
print file_name + " has been uploaded with convergent encryption."
def encdelete(file_name):
remote_file_name = base64.urlsafe_b64encode(enc.siv_encrypt(pbkey1, pbkey2, file_name, ""))
content_file_name = remote_file_name + '.contents'
key_file_name = remote_file_name + '.key'
#print "key file name: " + key_file_name
dpbx_client.file_delete(key_file_name)
dpbx_client.file_delete(content_file_name)
def download(file_name):
# Download a file
remote_file_name = base64.b64encode(enc.siv_encrypt(pbkey1, pbkey2, file_name, ""))
f2 = '/' + remote_file_name + ".key"
fx1 = '/' + remote_file_name + ".contents"
down_thread = Thread(target=download_proxy, args=(fx1,))
down_thread.start()
c2 = dpbx_client.get_file(f2).read()
down_thread.join()
hash_and_key = enc.decrypt(pbkey4, c2)
hash_r = hash_and_key[AES_BLOCK_SIZE:]
key = hash_and_key[:AES_BLOCK_SIZE]
hash2 = hmac.new(pbkey3, cx1+remote_file_name+key, hashlib.sha256).digest()
if (hash_r != hash2):
print hash_r.encode("hex"), hash2.encode("hex"), "Ciphertext has been corrupted"
return
contents = enc.decrypt(key, cx1)
outf = open(file_name, "wb")
outf.write(contents)
outf.close()
print file_name + " has been downloaded."
def p2pupload(file_name, info):
# Upload a file.
remote_file_name = base64.urlsafe_b64encode(enc.siv_encrypt(pbkey1, pbkey2, file_name, ""))
content_file_name = remote_file_name + '.contents'
key_file_name = remote_file_name + '.key'
file_plaintext = open(file_name, 'rb').read()
key = enc.get_convergent_key(file_plaintext, info)
c1 = enc.encrypt(key, file_plaintext)
temp_contents = open("./tempc", "wb")
temp_contents.write(c1)
temp_contents.close()
temp_contents = open("./tempc", "rb")
hash_r = hmac.new(pbkey3, c1+remote_file_name+key, hashlib.sha256).digest()
c2 = enc.encrypt(pbkey4, key + hash_r)
temp_key = open("./tempk", "wb")
temp_key.write(c2)
temp_key.close()
temp_key = open("./tempk", "rb")
up_thread = Thread(
target=dpbx_client.put_file, args=(content_file_name, temp_contents, True) )
up_thread.start()
dpbx_client.put_file(key_file_name, temp_key, True)
up_thread.join()
print file_name + " has been uploaded with p2p encryption."
