Class: Nexus::Cipher

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

Instance Method Summary collapse

Constructor Details

#initialize(pass, token = nil) ⇒ Cipher

Returns a new instance of Cipher.



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# File 'lib/nexus/cipher.rb', line 7

def initialize( pass, token = nil )
  @token = Base64.strict_decode64( token ) if token
  @token ||= OpenSSL::Random.random_bytes( 32 )

  iter = 20000
  key_len = 32
  @key = OpenSSL::PKCS5.pbkdf2_hmac_sha1( pass,
                                          @token,
                                          iter,
                                          key_len )
end

Instance Method Details

#decrypt(data) ⇒ Object 



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# File 'lib/nexus/cipher.rb', line 44

def decrypt( data )
  c = cipher
  c.decrypt
  c.key = @key
  c.iv = @iv
  c.update( Base64.strict_decode64( data ) ) + c.final
end

#encrypt(data) ⇒ Object 



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# File 'lib/nexus/cipher.rb', line 36

def encrypt( data )
  c = cipher
  c.encrypt
  c.key = @key
  @iv = c.random_iv
  Base64.strict_encode64( c.update( data ) + c.final )
end

#iv ⇒ Object 



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# File 'lib/nexus/cipher.rb', line 28

def iv
  Base64.strict_encode64( @iv ) if @iv
end

#iv=(iv) ⇒ Object 



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# File 'lib/nexus/cipher.rb', line 32

def iv=( iv )
  @iv = Base64.strict_decode64( iv )
end

#token ⇒ Object 



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# File 'lib/nexus/cipher.rb', line 24

def token
  Base64.strict_encode64( @token ) 
end