Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/octet/der_length_octet_string.c @ 1934:83b6a47759a8

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Add m_snprintf() that won't return negative
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 12:10:48 +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 #include "tomcrypt.h"
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11 /**
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12 @file der_length_octet_string.c
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13 ASN.1 DER, get length of OCTET STRING, Tom St Denis
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14 */
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16 #ifdef LTC_DER
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17 /**
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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18 Gets length of DER encoding of OCTET STRING
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19 @param noctets The number of octets in the string to encode
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20 @param outlen [out] The length of the DER encoding for the given string
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21 @return CRYPT_OK if successful
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22 */
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23 int der_length_octet_string(unsigned long noctets, unsigned long *outlen)
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24 {
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25 LTC_ARGCHK(outlen != NULL);
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27 if (noctets < 128) {
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28 /* 04 LL DD DD DD ... */
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29 *outlen = 2 + noctets;
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30 } else if (noctets < 256) {
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31 /* 04 81 LL DD DD DD ... */
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32 *outlen = 3 + noctets;
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33 } else if (noctets < 65536UL) {
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34 /* 04 82 LL LL DD DD DD ... */
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35 *outlen = 4 + noctets;
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36 } else if (noctets < 16777216UL) {
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37 /* 04 83 LL LL LL DD DD DD ... */
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38 *outlen = 5 + noctets;
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39 } else {
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40 return CRYPT_INVALID_ARG;
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41 }
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43 return CRYPT_OK;
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44 }
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46 #endif
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48
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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49 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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50 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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51 /* commit time: $Format:%ai$ */