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annotate libtomcrypt/src/stream/chacha/chacha_setup.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +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 static const char * const sigma = "expand 32-byte k";
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20 static const char * const tau = "expand 16-byte k";
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21
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22 /**
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23 Initialize an ChaCha context (only the key)
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24 @param st [out] The destination of the ChaCha state
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25 @param key The secret key
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26 @param keylen The length of the secret key (octets)
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27 @param rounds Number of rounds (e.g. 20 for ChaCha20)
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28 @return CRYPT_OK if successful
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29 */
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30 int chacha_setup(chacha_state *st, const unsigned char *key, unsigned long keylen, int rounds)
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31 {
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32 const char *constants;
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33
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34 LTC_ARGCHK(st != NULL);
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35 LTC_ARGCHK(key != NULL);
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36 LTC_ARGCHK(keylen == 32 || keylen == 16);
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37
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38 if (rounds == 0) rounds = 20;
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39
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40 LOAD32L(st->input[4], key + 0);
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41 LOAD32L(st->input[5], key + 4);
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42 LOAD32L(st->input[6], key + 8);
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43 LOAD32L(st->input[7], key + 12);
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44 if (keylen == 32) { /* 256bit */
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45 key += 16;
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46 constants = sigma;
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47 } else { /* 128bit */
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48 constants = tau;
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49 }
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50 LOAD32L(st->input[8], key + 0);
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51 LOAD32L(st->input[9], key + 4);
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52 LOAD32L(st->input[10], key + 8);
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53 LOAD32L(st->input[11], key + 12);
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54 LOAD32L(st->input[0], constants + 0);
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55 LOAD32L(st->input[1], constants + 4);
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56 LOAD32L(st->input[2], constants + 8);
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57 LOAD32L(st->input[3], constants + 12);
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58 st->rounds = rounds; /* e.g. 20 for chacha20 */
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59 st->ivlen = 0; /* will be set later by chacha_ivctr(32|64) */
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60 return CRYPT_OK;
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61 }
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62
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63 #endif
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64
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65 /* ref: $Format:%D$ */
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66 /* git commit: $Format:%H$ */
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67 /* commit time: $Format:%ai$ */