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annotate libtomcrypt/src/stream/chacha/chacha_ivctr64.c @ 1938:77bc00dcc19f default tip main master

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Bump version to 2022.82
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 14:43:27 +0800
parents 6dba84798cd5
children
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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 /* The implementation is based on:
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11 * chacha-ref.c version 20080118
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12 * Public domain from D. J. Bernstein
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13 */
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14
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15 #include "tomcrypt.h"
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16
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17 #ifdef LTC_CHACHA
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18
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19 /**
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20 Set IV + counter data to the ChaCha state
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21 @param st The ChaCha20 state
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22 @param iv The IV data to add
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23 @param ivlen The length of the IV (must be 8)
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24 @param counter 64bit (unsigned) initial counter value
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25 @return CRYPT_OK on success
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26 */
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27 int chacha_ivctr64(chacha_state *st, const unsigned char *iv, unsigned long ivlen, ulong64 counter)
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28 {
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29 LTC_ARGCHK(st != NULL);
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30 LTC_ARGCHK(iv != NULL);
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31 /* 64bit IV + 64bit counter */
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32 LTC_ARGCHK(ivlen == 8);
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33
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34 st->input[12] = (ulong32)(counter & 0xFFFFFFFF);
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35 st->input[13] = (ulong32)(counter >> 32);
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36 LOAD32L(st->input[14], iv + 0);
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37 LOAD32L(st->input[15], iv + 4);
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38 st->ksleft = 0;
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39 st->ivlen = ivlen;
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40 return CRYPT_OK;
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41 }
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42
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43 #endif
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44
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45 /* ref: $Format:%D$ */
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46 /* git commit: $Format:%H$ */
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47 /* commit time: $Format:%ai$ */