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ocrypto_chacha20_init

nrfxlib_sys

Function ocrypto_chacha20_init 

Source 
pub unsafe extern "C" fn ocrypto_chacha20_init(
    ctx: *mut ocrypto_chacha20_ctx,
    n: *const u8,
    n_len: usize,
    key: *const u8,
    count: u32,
)
Expand description

ChaCha20 encoder initialization.

The generator state * ctx - is initialized by this function.

  • ctx - Encoder state.
  • n - Nonce. May be NULL.
  • n_len - Nonce length. * n_len - = 8, 12, or 24.
  • key - Authentication key. May be NULL.
  • count - Initial block counter, usually 0 or 1.

@remark If * key - is NULL only * n - and * count - are set. If * n - is NULL only * key - is set. Both * key - and * n - must be set before update is called. @remark If * n_len - = 24, the XChaCha20 algorithm is used. @remark When reusing an encryption key * key - for a different message, a different nonce * n - or initial block counter * count - must be used.