Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/short_integer/der_length_short_integer.c @ 1617:1fbe598a14fb

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Merge bugfix delay invalid users
author Matt Johnston <matt@ucc.asn.au>
date Thu, 23 Aug 2018 23:43:45 +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_short_integer.c
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13 ASN.1 DER, get length of encoding, Tom St Denis
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14 */
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17 #ifdef LTC_DER
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18 /**
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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19 Gets length of DER encoding of num
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20 @param num The integer to get the size of
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21 @param outlen [out] The length of the DER encoding for the given integer
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22 @return CRYPT_OK if successful
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23 */
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24 int der_length_short_integer(unsigned long num, unsigned long *outlen)
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25 {
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26 unsigned long z, y, len;
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28 LTC_ARGCHK(outlen != NULL);
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30 /* force to 32 bits */
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31 num &= 0xFFFFFFFFUL;
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33 /* get the number of bytes */
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34 z = 0;
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35 y = num;
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36 while (y) {
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37 ++z;
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38 y >>= 8;
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39 }
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40
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41 /* handle zero */
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42 if (z == 0) {
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43 z = 1;
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44 }
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46 /* we need a 0x02 to indicate it's INTEGER */
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47 len = 1;
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49 /* length byte */
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50 ++len;
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52 /* bytes in value */
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53 len += z;
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54
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55 /* see if msb is set */
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56 len += (num&(1UL<<((z<<3) - 1))) ? 1 : 0;
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57
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58 /* return length */
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59 *outlen = len;
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60
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61 return CRYPT_OK;
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62 }
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64 #endif
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65
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66 /* ref: $Format:%D$ */
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67 /* git commit: $Format:%H$ */
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68 /* commit time: $Format:%ai$ */