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annotate libtomcrypt/src/stream/chacha/chacha_keystream.c @ 1674:ba6fc7afe1c5

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 06 Apr 2020 23:18:26 +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 /* 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 Generate a stream of random bytes via ChaCha
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21 @param st The ChaCha20 state
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22 @param out [out] The output buffer
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23 @param outlen The output length
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24 @return CRYPT_OK on success
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25 */
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26 int chacha_keystream(chacha_state *st, unsigned char *out, unsigned long outlen)
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27 {
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28 if (outlen == 0) return CRYPT_OK; /* nothing to do */
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29 LTC_ARGCHK(out != NULL);
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30 XMEMSET(out, 0, outlen);
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31 return chacha_crypt(st, out, outlen, out);
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32 }
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33
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34 #endif
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35
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36 /* ref: $Format:%D$ */
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37 /* git commit: $Format:%H$ */
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38 /* commit time: $Format:%ai$ */