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annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_setiv_rfc7905.c @ 1484:f68ee671bf6d

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author Matt Johnston <matt@ucc.asn.au>
date Sat, 10 Feb 2018 18:57:20 +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 Set IV + counter data (with RFC7905-magic) to the ChaCha20Poly1305 state and reset the context
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16 @param st The ChaCha20Poly1305 state
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17 @param iv The IV data to add
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18 @param ivlen The length of the IV (must be 12 or 8)
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19 @param sequence_number 64bit sequence number which is incorporated into IV as described in RFC7905
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20 @return CRYPT_OK on success
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21 */
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22 int chacha20poly1305_setiv_rfc7905(chacha20poly1305_state *st, const unsigned char *iv, unsigned long ivlen, ulong64 sequence_number)
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23 {
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24 int i;
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25 unsigned char combined_iv[12] = { 0 };
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26
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27 LTC_ARGCHK(st != NULL);
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28 LTC_ARGCHK(iv != NULL);
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29 LTC_ARGCHK(ivlen == 12);
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30
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31 STORE64L(sequence_number, combined_iv + 4);
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32 for (i = 0; i < 12; i++) combined_iv[i] = iv[i] ^ combined_iv[i];
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33 return chacha20poly1305_setiv(st, combined_iv, 12);
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34 }
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35
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36 #endif
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37
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38 /* ref: $Format:%D$ */
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39 /* git commit: $Format:%H$ */
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40 /* commit time: $Format:%ai$ */