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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
#include "tomcrypt.h"
#ifdef LTC_CHACHA20POLY1305_MODE
/**
Add AAD to the ChaCha20Poly1305 state
@param st The ChaCha20Poly1305 state
@param in The additional authentication data to add to the ChaCha20Poly1305 state
@param inlen The length of the ChaCha20Poly1305 data.
@return CRYPT_OK on success
*/
int chacha20poly1305_add_aad(chacha20poly1305_state *st, const unsigned char *in, unsigned long inlen)
{
int err;
if (inlen == 0) return CRYPT_OK; /* nothing to do */
LTC_ARGCHK(st != NULL);
if (st->aadflg == 0) return CRYPT_ERROR;
if ((err = poly1305_process(&st->poly, in, inlen)) != CRYPT_OK) return err;
st->aadlen += (ulong64)inlen;
return CRYPT_OK;
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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