Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c @ 1730:57226fc75cb5

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author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 20:41:34 +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_bit_string.c
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13 ASN.1 DER, get length of BIT 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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18 Gets length of DER encoding of BIT STRING
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19 @param nbits The number of bits 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_bit_string(unsigned long nbits, unsigned long *outlen)
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24 {
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25 unsigned long nbytes;
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26 LTC_ARGCHK(outlen != NULL);
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28 /* get the number of the bytes */
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29 nbytes = (nbits >> 3) + ((nbits & 7) ? 1 : 0) + 1;
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31 if (nbytes < 128) {
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32 /* 03 LL PP DD DD DD ... */
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33 *outlen = 2 + nbytes;
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34 } else if (nbytes < 256) {
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35 /* 03 81 LL PP DD DD DD ... */
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36 *outlen = 3 + nbytes;
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37 } else if (nbytes < 65536) {
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38 /* 03 82 LL LL PP DD DD DD ... */
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39 *outlen = 4 + nbytes;
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40 } else {
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41 return CRYPT_INVALID_ARG;
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42 }
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44 return CRYPT_OK;
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45 }
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47 #endif
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49
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50 /* ref: $Format:%D$ */
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51 /* git commit: $Format:%H$ */
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52 /* commit time: $Format:%ai$ */