Module: Rmega::Crypto::AesCbc

Included in:
Rmega::Crypto
Defined in:
lib/rmega/crypto/aes_cbc.rb

Instance Method Summary collapse

Instance Method Details

#aes_cbc_cipher ⇒ Object 



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# File 'lib/rmega/crypto/aes_cbc.rb', line 4

def aes_cbc_cipher
  OpenSSL::Cipher::AES.new(128, :CBC)
end

#aes_cbc_decrypt(key, data) ⇒ Object 



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# File 'lib/rmega/crypto/aes_cbc.rb', line 16

def aes_cbc_decrypt(key, data)
  cipher = aes_cbc_cipher
  cipher.decrypt
  cipher.padding = 0
  cipher.key = key
  return cipher.update(data) + cipher.final
end

#aes_cbc_encrypt(key, data) ⇒ Object 



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# File 'lib/rmega/crypto/aes_cbc.rb', line 8

def aes_cbc_encrypt(key, data)
  cipher = aes_cbc_cipher
  cipher.encrypt
  cipher.padding = 0
  cipher.key = key
  return cipher.update(data) + cipher.final
end

#aes_cbc_mac(key, data, iv) ⇒ Object 



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# File 'lib/rmega/crypto/aes_cbc.rb', line 24

def aes_cbc_mac(key, data, iv)
  cipher = aes_cbc_cipher
  cipher.encrypt
  cipher.padding = 0
  cipher.iv = iv if iv
  cipher.key = key

  n = 0
  mac = nil

  loop do
    block = data[n..n+15]
    break if !block or block.empty?
    block << "\x0"*(16-block.size) if block.size < 16
    n += 16
    mac = cipher.update(block)
  end

  return mac
end