Module: XapoUtils

Defined in:
lib/xapo_utils.rb

Class Method Summary collapse

Class Method Details

.encrypt(payload, secret, default_padding = true) ⇒ Object

Do PKCS#7 padding and encrypting.

Args:

payload (str): The text to encode.
secret (str): the encoding key.
default_padding (bool): whether it uses default padding or not

Returns:

str: The padded bytestring.



17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/xapo_utils.rb', line 17

def encrypt(payload, secret, default_padding=true)
  cipher = OpenSSL::Cipher::AES.new("256-ECB")
  cipher.encrypt
  cipher.key = secret

  # TODO zero padding is not handled correctly, it's too specific
  #      and inflexible making it hard to change.
  if !default_padding
    cipher.padding = 0
    payload = zero_padding(payload)
  end        

  encrypted = cipher.update(payload) + cipher.final

  return Base64.encode64(encrypted)
end

.timestamp ⇒ Object 



34
 
# File 'lib/xapo_utils.rb', line 34

def timestamp; (Time.now.to_f * 1000).to_i end

.zero_padding(payload) ⇒ Object 



36
37
38
39
40
41
 
# File 'lib/xapo_utils.rb', line 36

def zero_padding(payload)
  l = 16 - payload.length % 16
  res = payload + "\0" * l

  return res 
end