Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c @ 449:3e6c536bc023

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Add -W <windowsize> argument and document it.
author Matt Johnston <matt@ucc.asn.au>
date Wed, 25 Jul 2007 15:44:25 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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13 /**
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14 @file der_length_bit_string.c
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15 ASN.1 DER, get length of BIT STRING, Tom St Denis
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16 */
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18 #ifdef LTC_DER
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19 /**
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20 Gets length of DER encoding of BIT STRING
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21 @param nbits The number of bits in the string to encode
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22 @param outlen [out] The length of the DER encoding for the given string
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23 @return CRYPT_OK if successful
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24 */
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25 int der_length_bit_string(unsigned long nbits, unsigned long *outlen)
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26 {
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27 unsigned long nbytes;
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28 LTC_ARGCHK(outlen != NULL);
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29
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30 /* get the number of the bytes */
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31 nbytes = (nbits >> 3) + ((nbits & 7) ? 1 : 0) + 1;
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33 if (nbytes < 128) {
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34 /* 03 LL PP DD DD DD ... */
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35 *outlen = 2 + nbytes;
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36 } else if (nbytes < 256) {
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37 /* 03 81 LL PP DD DD DD ... */
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38 *outlen = 3 + nbytes;
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39 } else if (nbytes < 65536) {
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40 /* 03 82 LL LL PP DD DD DD ... */
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41 *outlen = 4 + nbytes;
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42 } else {
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43 return CRYPT_INVALID_ARG;
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44 }
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46 return CRYPT_OK;
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47 }
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49 #endif
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52 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c,v $ */
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53 /* $Revision: 1.2 $ */
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54 /* $Date: 2006/03/31 14:15:35 $ */