Class: BlockCipherKit::CipherIO

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

Overview

Allows an OpenSSL::Cipher to be written through as if it were an IO. This allows the cipher to be passed to things like IO.copy_stream :nodoc:

Instance Method Summary collapse

Constructor Details

#initialize(io, cipher) ⇒ CipherIO

Returns a new instance of CipherIO.



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# File 'lib/block_cipher_kit/cipher_io.rb', line 5

def initialize(io, cipher)
  @io = io
  @cipher = cipher
end

Instance Method Details

#write(bytes) ⇒ Object 



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# File 'lib/block_cipher_kit/cipher_io.rb', line 10

def write(bytes)
  # OpenSSL ciphers fail if you update() them with an empty buffer
  return 0 if bytes.bytesize.zero?

  @io.write(@cipher.update(bytes))
  # We must return the amount of bytes of input
  # we have accepted, not the amount of bytes
  # of output we produced from the cipher
  bytes.bytesize
end