Class: BlockCipherKit::PassthruScheme

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

Instance Method Summary collapse

Methods inherited from BaseScheme

#decrypt_range, #inspect

Constructor Details

#initialize ⇒ PassthruScheme

Returns a new instance of PassthruScheme.



2
3
 
# File 'lib/block_cipher_kit/passthru_scheme.rb', line 2

def initialize(...)
end

Instance Method Details

#streaming_decrypt(from_ciphertext_io:, into_plaintext_io: nil, &blk) ⇒ Object 



5
6
7
8
 
# File 'lib/block_cipher_kit/passthru_scheme.rb', line 5

def streaming_decrypt(from_ciphertext_io:, into_plaintext_io: nil, &blk)
  w = into_plaintext_io || BlockCipherKit::BlockWritable.new(&blk)
  IO.copy_stream(from_ciphertext_io, w)
end

#streaming_decrypt_range(from_ciphertext_io:, range:, into_plaintext_io: nil, &blk) ⇒ Object 



20
21
22
23
24
25
 
# File 'lib/block_cipher_kit/passthru_scheme.rb', line 20

def streaming_decrypt_range(from_ciphertext_io:, range:, into_plaintext_io: nil, &blk)
  from_ciphertext_io.seek(from_ciphertext_io.pos + range.begin)
  n_bytes = range.end - range.begin + 1
  w = BlockCipherKit::BlockWritable.new(into_plaintext_io, &blk)
  w.write(from_ciphertext_io.read(n_bytes))
end

#streaming_encrypt(into_ciphertext_io:, from_plaintext_io: nil, &blk) ⇒ Object 



10
11
12
13
14
15
16
17
18
 
# File 'lib/block_cipher_kit/passthru_scheme.rb', line 10

def streaming_encrypt(into_ciphertext_io:, from_plaintext_io: nil, &blk)
  if from_plaintext_io && !blk
    IO.copy_stream(from_plaintext_io, into_ciphertext_io)
  elsif blk
    blk.call(into_ciphertext_io)
  else
    raise ArgumentError
  end
end