Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/short_integer/der_length_short_integer.c @ 1435:f849a5ca2efc

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update to libtomcrypt 1.17 (with Dropbear changes)
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Jun 2017 17:50:50 +0800
parents 0cbe8f6dbf9e
children 6dba84798cd5
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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 * Tom St Denis, [email protected], http://libtom.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file der_length_short_integer.c
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15 ASN.1 DER, get length of encoding, Tom St Denis
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16 */
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19 #ifdef LTC_DER
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20 /**
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21 Gets length of DER encoding of num
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22 @param num The integer to get the size of
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23 @param outlen [out] The length of the DER encoding for the given integer
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24 @return CRYPT_OK if successful
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25 */
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26 int der_length_short_integer(unsigned long num, unsigned long *outlen)
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27 {
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28 unsigned long z, y, len;
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30 LTC_ARGCHK(outlen != NULL);
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32 /* force to 32 bits */
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33 num &= 0xFFFFFFFFUL;
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34
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35 /* get the number of bytes */
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36 z = 0;
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37 y = num;
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38 while (y) {
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39 ++z;
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40 y >>= 8;
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41 }
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42
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43 /* handle zero */
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44 if (z == 0) {
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45 z = 1;
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46 }
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48 /* we need a 0x02 to indicate it's INTEGER */
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49 len = 1;
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51 /* length byte */
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52 ++len;
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53
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54 /* bytes in value */
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55 len += z;
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57 /* see if msb is set */
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58 len += (num&(1UL<<((z<<3) - 1))) ? 1 : 0;
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59
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60 /* return length */
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61 *outlen = len;
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62
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63 return CRYPT_OK;
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64 }
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66 #endif
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67
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68 /* $Source$ */
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69 /* $Revision$ */
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70 /* $Date$ */