Mercurial > dropbear
annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_setiv_rfc7905.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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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: $Format:%ai$ */ |