`CtrMode`

@memory_only
struct CtrMode[C: BlockCipherDecryptable & BlockCipherEncryptable & Deinitable & Movable, SIZE: Int = C.BLOCK_SIZE, BIG_ENDIAN: Bool = True]

Counter (CTR) block cipher mode.

NIST SP 800-38A, Section 6.5: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf

SIZE is the width in bytes of the incrementing counter field; the remaining BLOCK_SIZE - SIZE bytes are the fixed nonce, never touched by the increment. SIZE == BLOCK_SIZE (the default) increments the whole block.

BIG_ENDIAN (default) places the counter in the last SIZE bytes and increments big-endian (CTR-32BE / AES-GCM style). When False, the counter occupies the first SIZE bytes and increments little-endian (CTR-32LE).

Aliases

BLOCK_SIZE = C.BLOCK_SIZE

Parameters

C (BlockCipherDecryptable & BlockCipherEncryptable & Deinitable & Movable)
SIZE (Int)
BIG_ENDIAN (Bool)

Implemented traits

AnyType, BlockCipherDecryptable, BlockCipherEncryptable, Deinitable, Movable

Methods

`init`

fn def __init__(out self, var cipher: C, var ctr: Array[UInt8, C.BLOCK_SIZE])

Initialize from a fully-assembled initial counter block.

Args:

cipher (C)
ctr (Array[UInt8, C.BLOCK_SIZE])
self (Self)

Returns:

Self

`encrypt`

fn def encrypt[o: MutOrigin](mut self, data: Span[UInt8, o])

Parameters:

o (MutOrigin)

Args:

self (Self)
data (Span[UInt8, o])

Raises:

`decrypt`

fn def decrypt[o: MutOrigin](mut self, data: Span[UInt8, o])

Parameters:

o (MutOrigin)

Args:

self (Self)
data (Span[UInt8, o])

Raises: