Class: CryptoToolchain::Tools::CbcPaddingOracleAttack

Inherits:
Object
  • Object
show all
Defined in:
lib/crypto_toolchain/tools/cbc_padding_oracle_attack.rb

Instance Method Summary collapse

Constructor Details

#initialize(oracle:, blocksize: 16) ⇒ CbcPaddingOracleAttack

Returns a new instance of CbcPaddingOracleAttack.



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# File 'lib/crypto_toolchain/tools/cbc_padding_oracle_attack.rb', line 5

def initialize(oracle: , blocksize: 16)
  @oracle = oracle
  @blocksize = blocksize
end

Instance Method Details

#execute ⇒ Object 



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# File 'lib/crypto_toolchain/tools/cbc_padding_oracle_attack.rb', line 10

def execute
  _blocks = ciphertext.in_blocks(blocksize)
  _blocks[1..-1].map.with_index(1) do |block, i|
    preceding = _blocks[i - 1]
    intermediate = intermediate_block(preceding: preceding, target: block)
    intermediate ^ preceding
  end.
    join.
    without_pkcs7_padding(blocksize)
end