Class: HexaPDF::Encryption::FastARC4

Inherits:

Object

• Object
• HexaPDF::Encryption::FastARC4

Includes:

ARC4

Defined in:

lib/hexapdf/encryption/fast_arc4.rb

Overview

Implementation of the general encryption algorithm ARC4 using OpenSSL as backend.

See: PDF1.7 s7.6.2

Instance Method Summary

• #initialize(key) ⇒ FastARC4 constructor

  Creates a new FastARC4 object using the given encryption key.

• #process(data) ⇒ Object (also: #decrypt, #encrypt)

  Processes the given data.

Methods included from ARC4

prepended

Constructor Details

#initialize(key) ⇒ FastARC4

Creates a new FastARC4 object using the given encryption key.

# File 'lib/hexapdf/encryption/fast_arc4.rb', line 48

def initialize(key)
  @cipher = OpenSSL::Cipher::RC4.new
  @cipher.key_len = key.length
  @cipher.key = key
end

Instance Method Details

#process(data) ⇒ Object Also known as: decrypt, encrypt

Processes the given data.

Since this is a symmetric algorithm, the same method can be used for encryption and decryption.

# File 'lib/hexapdf/encryption/fast_arc4.rb', line 58

def process(data)
  @cipher.update(data)
end