Inheritance diagram for fpoirotte\Cryptal\PaddingInterface:

Public Member Functions
	getPaddingData ($blockSize, $expectedSize)

	getPaddingSize ($paddedData, $blockSize)

Detailed Description

Interface for a padding scheme.

Definition at line 8 of file PaddingInterface.php.

Member Function Documentation

fpoirotte\Cryptal\PaddingInterface::getPaddingData	(	$blockSize,
		$expectedSize
	)

Return padding data to form a complete block.

Parameters

int	$blockSize	The cipher's block size, in bytes.
int	$expectedSize	The padding's expected size (in bytes) to form a (possibly new) complete block. This value is always such that: $0 < \$expectedSize <= \$blockSize$

Return values

string Padding data.

fpoirotte\Cryptal\PaddingInterface::getPaddingSize	(	$paddedData,
		$blockSize
	)

Return the size (in bytes) of the padding in some already-padded data.

Parameters

string	$paddedData	The padded data to analyze.
int	$blockSize	The cipher's block size, in bytes.

Exceptions

Exception An exception is thrown when the supplied data is invalid (was not padded using the currently-selected scheme).

Warning: Some padding schemes can generate ambiguous data, resulting in possible data loss while removing the padding. This method suffers from the same shortcomings. If possible, you should not rely on this method to determine the plaintext's length. Instead, you should retrieve it using other means (eg. out-of-band communications).

The documentation for this interface was generated from the following file: