ocrypto_chacha20_poly1305_update_aad()

void ocrypto_chacha20_poly1305_update_aad	(	ocrypto_chacha20_poly1305_ctx *	ctx,
		const uint8_t *	a,
		size_t	a_len )

#include <crypto/nrf_oberon/include/ocrypto_chacha20_poly1305.h>

ChaCha20-Poly1305 incremental aad input.

The generator state ctx is updated to include an additional authenticated data chunk a.

This function can be called repeatedly until the whole data is processed.

Parameters

ctx	Generator state.
a	Additional authenticated data.
a_len	Length of a.

Remarks

Initialization of the generator state ctx through ocrypto_chacha20_poly1305_init is required before this function can be called.

ocrypto_chacha20_poly1305_update_aad must be called before any call to ocrypto_chacha20_poly1305_update_enc or ocrypto_chacha20_poly1305_update_dec.

If n_len = 24, the XChaCha20-Poly1305 algorithm is used.