Mercurial > dropbear

comparison libtomcrypt/src/encauth/chachapoly/chacha20poly1305_add_aad.c @ 1471:6dba84798cd5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
parents
children
comparison
equal deleted inserted replaced
1470:8bba51a55704 1471:6dba84798cd5
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 */
9
10 #include "tomcrypt.h"
11
12 #ifdef LTC_CHACHA20POLY1305_MODE
13
14 /**
15 Add AAD to the ChaCha20Poly1305 state
16 @param st The ChaCha20Poly1305 state
17 @param in The additional authentication data to add to the ChaCha20Poly1305 state
18 @param inlen The length of the ChaCha20Poly1305 data.
19 @return CRYPT_OK on success
20 */
21 int chacha20poly1305_add_aad(chacha20poly1305_state *st, const unsigned char *in, unsigned long inlen)
22 {
23 int err;
24
25 if (inlen == 0) return CRYPT_OK; /* nothing to do */
26 LTC_ARGCHK(st != NULL);
27
28 if (st->aadflg == 0) return CRYPT_ERROR;
29 if ((err = poly1305_process(&st->poly, in, inlen)) != CRYPT_OK) return err;
30 st->aadlen += (ulong64)inlen;
31 return CRYPT_OK;
32 }
33
34 #endif
35
36 /* ref: $Format:%D$ */
37 /* git commit: $Format:%H$ */
38 /* commit time: $Format:%ai$ */