Mercurial > dropbear
comparison libtomcrypt/src/encauth/chachapoly/chacha20poly1305_done.c @ 1471:6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 09 Feb 2018 21:44:05 +0800 |
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1470:8bba51a55704 | 1471:6dba84798cd5 |
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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 Terminate a ChaCha20Poly1305 stream | |
16 @param st The ChaCha20Poly1305 state | |
17 @param tag [out] The destination for the MAC tag | |
18 @param taglen [in/out] The length of the MAC tag | |
19 @return CRYPT_OK on success | |
20 */ | |
21 int chacha20poly1305_done(chacha20poly1305_state *st, unsigned char *tag, unsigned long *taglen) | |
22 { | |
23 unsigned char padzero[16] = { 0 }; | |
24 unsigned long padlen; | |
25 unsigned char buf[16]; | |
26 int err; | |
27 | |
28 LTC_ARGCHK(st != NULL); | |
29 | |
30 padlen = 16 - (unsigned long)(st->ctlen % 16); | |
31 if (padlen < 16) { | |
32 if ((err = poly1305_process(&st->poly, padzero, padlen)) != CRYPT_OK) return err; | |
33 } | |
34 STORE64L(st->aadlen, buf); | |
35 STORE64L(st->ctlen, buf + 8); | |
36 if ((err = poly1305_process(&st->poly, buf, 16)) != CRYPT_OK) return err; | |
37 if ((err = poly1305_done(&st->poly, tag, taglen)) != CRYPT_OK) return err; | |
38 if ((err = chacha_done(&st->chacha)) != CRYPT_OK) return err; | |
39 return CRYPT_OK; | |
40 } | |
41 | |
42 #endif | |
43 | |
44 /* ref: $Format:%D$ */ | |
45 /* git commit: $Format:%H$ */ | |
46 /* commit time: $Format:%ai$ */ |