Module chacha20

Module for the ChaCha20 stream cipher algorithm.

Structs

ChaCha20

The ChaCha20 struct represents the ChaCha20 stream cipher.

Constants

CHACHA20_NONCE_SIZE

Size of the ChaCha20 nonce in bytes. The nonce is a 64-bit (8 bytes) value used to make each block unique.

CONSTANTS

Constants for the ChaCha20 algorithm. These four 32-bit words represent the ASCII encoding of “expand 32-byte k”, used in the state initialization of the ChaCha20 block.

STATE_WORDS

Number of 32-bit words in the ChaCha state. The ChaCha20 state consists of 16 words, each of which is 32 bits long.

Functions

permute

Runs the ChaCha20 permutation on the provided state.

xor_bytes

XORs two 512-bit state arrays. This function modifies the first array in place.

Type Aliases

Block

The array of words representing a ChaCha20 block.