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annotate libtomcrypt/src/mac/poly1305/poly1305_memory_multi.c @ 1831:0a3d02c66bf6

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Comment on reason for DROPBEAR_MAX_PASSWORD_LEN limit
author Matt Johnston <matt@codeconstruct.com.au>
date Tue, 12 Oct 2021 21:29:25 +0800
parents 6dba84798cd5
children
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rev   line source
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 * Public Domain poly1305 from Andrew Moon
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12 * https://github.com/floodyberry/poly1305-donna
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13 */
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14
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15 #include "tomcrypt.h"
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16 #include <stdarg.h>
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17
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18 #ifdef LTC_POLY1305
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19
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20 /**
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21 POLY1305 multiple blocks of memory to produce the authentication tag
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22 @param key The secret key
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23 @param keylen The length of the secret key (octets)
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24 @param mac [out] Destination of the authentication tag
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25 @param maclen [in/out] Max size and resulting size of authentication tag
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26 @param in The data to POLY1305
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27 @param inlen The length of the data to POLY1305 (octets)
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28 @param ... tuples of (data,len) pairs to POLY1305, terminated with a (NULL,x) (x=don't care)
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29 @return CRYPT_OK if successful
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30 */
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31 int poly1305_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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32 {
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33 poly1305_state st;
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34 int err;
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35 va_list args;
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36 const unsigned char *curptr;
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37 unsigned long curlen;
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38
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39 LTC_ARGCHK(key != NULL);
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40 LTC_ARGCHK(in != NULL);
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41 LTC_ARGCHK(mac != NULL);
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42 LTC_ARGCHK(maclen != NULL);
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43
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44 va_start(args, inlen);
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45 curptr = in;
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46 curlen = inlen;
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47 if ((err = poly1305_init(&st, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
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48 for (;;) {
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49 if ((err = poly1305_process(&st, curptr, curlen)) != CRYPT_OK) { goto LBL_ERR; }
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50 curptr = va_arg(args, const unsigned char*);
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51 if (curptr == NULL) break;
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52 curlen = va_arg(args, unsigned long);
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53 }
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54 err = poly1305_done(&st, mac, maclen);
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55 LBL_ERR:
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56 #ifdef LTC_CLEAN_STACK
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57 zeromem(&st, sizeof(poly1305_state));
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58 #endif
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59 va_end(args);
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60 return err;
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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: $Format:%ai$ */