Enum Padding 

pub enum Padding {
    None,
    Pkcs7,
    Iso9797M1,
    Iso9797M2,
    AnsiX923,
}

Padding scheme used at the end of an Cipher block-mode stream.

Padding only applies to ECB and CBC. CTR mode requires Padding::None and the constructor will return Error::InvalidPaddingForMode otherwise.

Variants

None

No padding. Caller must feed a multiple of the block size in total; otherwise finalize returns Error::UnpaddedInput.

Pkcs7

PKCS#7 padding (RFC 5652 §6.3). Pads with n copies of the byte n, where n is the number of bytes added (1..=block). Always adds at least one byte. Equivalent to JCE’s PKCS5Padding for 8-byte blocks.

Iso9797M1

ISO/IEC 9797-1 Padding Method 1: append 0x00 bytes until the block is full. Adds zero bytes if the input is already block-aligned, which makes the operation lossy on decryption (trailing zero bytes of the original message are indistinguishable from padding). Also known as zero padding.

Iso9797M2

ISO/IEC 9797-1 Padding Method 2: append 0x80 followed by as many 0x00 bytes as needed to fill the block. Always adds at least one byte. Identical to ISO/IEC 7816-4 padding (also called “bit padding”).

AnsiX923

ANSI X9.23 padding: append 0x00 bytes followed by a final byte holding the padding length. Always adds at least one byte. Legacy; ships for interop with X9.23-encoded data.

Trait Implementations

impl Clone for Padding

fn clone(&self) -> Padding

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Padding

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Padding

fn eq(&self, other: &Padding) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Padding

impl Eq for Padding

impl StructuralPartialEq for Padding