Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence_flexi.c @ 1721:4877afd51e04

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Added tag DROPBEAR_2020.79 for changeset e2e4929d057b
author Matt Johnston <matt@ucc.asn.au>
date Mon, 15 Jun 2020 23:51:39 +0800
parents e9dba7abd939
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file der_decode_sequence_flexi.c
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13 ASN.1 DER, decode an array of ASN.1 types with a flexi parser, Tom St Denis
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14 */
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15
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16 #ifdef LTC_DER
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17
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18 static unsigned long _fetch_length(const unsigned char *in, unsigned long inlen, unsigned long *data_offset)
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19 {
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20 unsigned long x, z;
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21
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22 *data_offset = 0;
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23
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24 /* skip type and read len */
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25 if (inlen < 2) {
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26 return 0xFFFFFFFF;
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27 }
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28 ++in; ++(*data_offset);
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29
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30 /* read len */
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31 x = *in++; ++(*data_offset);
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32
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33 /* <128 means literal */
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34 if (x < 128) {
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35 return x+*data_offset;
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36 }
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37 x &= 0x7F; /* the lower 7 bits are the length of the length */
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38 inlen -= 2;
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39
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40 /* len means len of len! */
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41 if (x == 0 || x > 4 || x > inlen) {
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42 return 0xFFFFFFFF;
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43 }
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44
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45 *data_offset += x;
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46 z = 0;
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47 while (x--) {
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48 z = (z<<8) | ((unsigned long)*in);
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49 ++in;
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50 }
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51 return z+*data_offset;
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52 }
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53
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54 static int _new_element(ltc_asn1_list **l)
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55 {
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56 /* alloc new link */
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57 if (*l == NULL) {
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58 *l = XCALLOC(1, sizeof(ltc_asn1_list));
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59 if (*l == NULL) {
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60 return CRYPT_MEM;
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61 }
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62 } else {
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63 (*l)->next = XCALLOC(1, sizeof(ltc_asn1_list));