Padding class abstract

Padding is a process to extend the input message to match a specific block size to be used in the cryptographic algorithms.

Reference: https://en.wikipedia.org/wiki/Padding_(cryptography)

Constructors

Padding.new()

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

name → String

The name of the algorithm

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

getPadLength(List<int> block, [int? size]) → int

Returns the padding length from the block according to the scheme.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

pad(List<int> block, int pos, [int? size]) → bool

Apply the scheme to the input block. The padding is applied starting from the pos to the end of the block.

toString() → String

A string representation of this object.

inherited

unpad(List<int> block, [int? size]) → List<int>

Returns the original message after removing padding from the block using the scheme.

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

ansi → const _ANSIPadding

This ANSI X9.23 standard padding consists of a sequence of zeros with the last byte set to the number of padding bytes added, including itself. If the input size is already a multiple of the block size, an extra block of padding is added.

byte → const _BytePadding

This padding has 0x80 as the first byte followed by a sequence of zeros. It was originally defined as a communication standard for smart cards containing a file system in ISO/IEC 7816-4:2005.

none → const _NonePadding

Does not apply any padding. The message size is always expected to be equal to the block size.

pkcs5 → const _PKCS5Padding

Same as pkcs7 padding scheme, except it is only defined for exactly 64-bit block. Primarily used with DES and other algorithms with an 8-byte block size.

pkcs7 → const _PKCS7Padding

Padding is in whole bytes. The value of each added byte is the number of bytes that are added. If the input size is already a multiple of the block size, an extra block of padding is added.

zero → const _ZeroPadding

Padding with zeros to match the block size.