Module secured_cipher::algorithm::chacha20

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Expand description

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.