ocrypto_chacha20_update()

void ocrypto_chacha20_update	(	ocrypto_chacha20_ctx *	ctx,
		uint8_t *	c,
		const uint8_t *	m,
		size_t	m_len )

#include <crypto/nrf_oberon/include/ocrypto_chacha20.h>

ChaCha20 encoder/decoder.

The message m is ChaCha20 encrypted and the resulting cipher stream is written to c.

For decryption, the ciphertext is used as input message m and the resulting decrypted message is written to c.

This function can be called repeatedly on arbitrarily small chunks of a larger message until the whole message has been processed.

Parameters

	ctx	Encoder/decoder state.
[out]	c	Generated output (ciphertext or plaintext). Same length as input message.
	m	Input message.
	m_len	Length of c and m; m_len < 2^38 bytes.

Remarks

Initialization of the encoder state ctx through ocrypto_chacha20_init is required before this function can be called.