Class: PubnubCrypto

Inherits:
Object
  • Object
show all
Defined in:
lib/pubnub_crypto.rb

Instance Method Summary collapse

Constructor Details

#initialize(cipher_key) ⇒ PubnubCrypto

Returns a new instance of PubnubCrypto.



4
5
6
7
8
9
10
11
12
13
14
 
# File 'lib/pubnub_crypto.rb', line 4

def initialize(cipher_key)
  @alg = "AES-256-CBC"
  sha256_key = Digest::SHA256.hexdigest(cipher_key)
  @key = sha256_key.slice(0,32)

  #puts("\nraw sha cipher_key is: #{cipher_key}")
  #puts("raw sha cipher_key is: #{sha256_key}")
  #puts("padded cipher_key is: #{@key}\n")

  @iv = '0123456789012345'
end

Instance Method Details

#decrypt(cipher_text) ⇒ Object 



33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
 
# File 'lib/pubnub_crypto.rb', line 33

def decrypt(cipher_text)
  decode_cipher = OpenSSL::Cipher::Cipher.new(@alg)
  decode_cipher.decrypt
  decode_cipher.key = @key
  decode_cipher.iv = @iv

  plain_text = ""

  begin
  undecoded_text = Base64.decode64(cipher_text)
  plain_text = decode_cipher.update(undecoded_text)
  plain_text << decode_cipher.final
  rescue => e

    return "DECRYPTION_ERROR"

  end

  return Yajl.load(plain_text)
end

#encrypt(message) ⇒ Object 



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

def encrypt(message)

  aes = OpenSSL::Cipher::Cipher.new(@alg)
  aes.encrypt
  aes.key = @key
  aes.iv = @iv

  json_message = Yajl.dump(message)
  cipher = aes.update(json_message)
  cipher << aes.final

  Base64.strict_encode64(cipher)

end