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annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_done.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents 6dba84798cd5
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_CHACHA20POLY1305_MODE
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13
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14 /**
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15 Terminate a ChaCha20Poly1305 stream
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16 @param st The ChaCha20Poly1305 state
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17 @param tag [out] The destination for the MAC tag
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18 @param taglen [in/out] The length of the MAC tag
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19 @return CRYPT_OK on success
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20 */
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21 int chacha20poly1305_done(chacha20poly1305_state *st, unsigned char *tag, unsigned long *taglen)
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22 {
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23 unsigned char padzero[16] = { 0 };
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24 unsigned long padlen;
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25 unsigned char buf[16];
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26 int err;
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27
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28 LTC_ARGCHK(st != NULL);
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29
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30 padlen = 16 - (unsigned long)(st->ctlen % 16);
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31 if (padlen < 16) {
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32 if ((err = poly1305_process(&st->poly, padzero, padlen)) != CRYPT_OK) return err;
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33 }
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34 STORE64L(st->aadlen, buf);
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35 STORE64L(st->ctlen, buf + 8);
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36 if ((err = poly1305_process(&st->poly, buf, 16)) != CRYPT_OK) return err;
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37 if ((err = poly1305_done(&st->poly, tag, taglen)) != CRYPT_OK) return err;
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38 if ((err = chacha_done(&st->chacha)) != CRYPT_OK) return err;
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39 return CRYPT_OK;
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40 }
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41
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42 #endif
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43
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44 /* ref: $Format:%D$ */
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45 /* git commit: $Format:%H$ */
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46 /* commit time: $Format:%ai$ */