class Keen::AESHelperOld

Constants

BLOCK_SIZE

Public Class Methods

aes256_decrypt(key, iv_plus_encrypted) click to toggle source
# File lib/keen/aes_helper_old.rb, line 11
def aes256_decrypt(key, iv_plus_encrypted)
  padded_key = pad(key)
  unhexed_iv_plus_encrypted = unhexlify(iv_plus_encrypted)
  iv = unhexed_iv_plus_encrypted[0, 16]
  encrypted = unhexed_iv_plus_encrypted[16, unhexed_iv_plus_encrypted.length]
  aes = OpenSSL::Cipher::AES.new(256, :CBC)
  aes.decrypt
  aes.key = padded_key
  aes.iv = iv
  aes.update(encrypted) + aes.final
end
aes256_encrypt(key, plaintext, iv = nil) click to toggle source
# File lib/keen/aes_helper_old.rb, line 23
def aes256_encrypt(key, plaintext, iv = nil)
  raise OpenSSL::Cipher::CipherError.new("iv must be 16 bytes") if !iv.nil? && iv.length != 16
  padded_key = pad(key)
  aes = OpenSSL::Cipher::AES.new(256, :CBC)
  aes.encrypt
  aes.key = padded_key
  aes.iv = iv unless iv.nil?
  iv ||= aes.random_iv
  encrypted = aes.update(plaintext) + aes.final
  hexlify(iv) + hexlify(encrypted)
end
hexlify(msg) click to toggle source
# File lib/keen/aes_helper_old.rb, line 35
def hexlify(msg)
  msg.unpack('H*')[0]
end
pad(msg) click to toggle source
# File lib/keen/aes_helper_old.rb, line 43
def pad(msg)
  missing_chars = msg.length % BLOCK_SIZE
  return msg if missing_chars == 0
  
  pad_len = BLOCK_SIZE - missing_chars

  padding = pad_len.chr * pad_len
  padded = msg + padding
  padded
end
unhexlify(msg) click to toggle source
# File lib/keen/aes_helper_old.rb, line 39
def unhexlify(msg)
  [msg].pack('H*')
end