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annotate libtomcrypt/src/mac/blake2/blake2bmac_memory_multi.c @ 1734:73646de50f13 DROPBEAR_2020.80

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version 2020.80
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:45:59 +0800
parents 6dba84798cd5
children
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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 #include <stdarg.h>
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12
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13 #ifdef LTC_BLAKE2BMAC
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14
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15 /**
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16 BLAKE2B MAC multiple blocks of memory to produce the authentication tag
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17 @param key The secret key
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18 @param keylen The length of the secret key (octets)
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19 @param mac [out] Destination of the authentication tag
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20 @param maclen [in/out] Max size and resulting size of authentication tag
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21 @param in The data to BLAKE2B MAC
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22 @param inlen The length of the data to BLAKE2B MAC (octets)
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23 @param ... tuples of (data,len) pairs to BLAKE2B MAC, terminated with a (NULL,x) (x=don't care)
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24 @return CRYPT_OK if successful
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25 */
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26 int blake2bmac_memory_multi(const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen, const unsigned char *in, unsigned long inlen, ...)
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27 {
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28 blake2bmac_state st;
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29 int err;
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30 va_list args;
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31 const unsigned char *curptr;
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32 unsigned long curlen;
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33
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34 LTC_ARGCHK(key != NULL);
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35 LTC_ARGCHK(in != NULL);
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36 LTC_ARGCHK(mac != NULL);
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37 LTC_ARGCHK(maclen != NULL);
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38
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39 va_start(args, inlen);
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40 curptr = in;
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41 curlen = inlen;
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42 if ((err = blake2bmac_init(&st, *maclen, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
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43 for (;;) {
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44 if ((err = blake2bmac_process(&st, curptr, curlen)) != CRYPT_OK) { goto LBL_ERR; }
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45 curptr = va_arg(args, const unsigned char*);
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46 if (curptr == NULL) break;
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47 curlen = va_arg(args, unsigned long);
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48 }
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49 err = blake2bmac_done(&st, mac, maclen);
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50 LBL_ERR:
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51 #ifdef LTC_CLEAN_STACK
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52 zeromem(&st, sizeof(blake2bmac_state));
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53 #endif
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54 va_end(args);
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55 return err;
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56 }
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57
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58 #endif
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59
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60 /* ref: $Format:%D$ */
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61 /* git commit: $Format:%H$ */
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62 /* commit time: $Format:%ai$ */