Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +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: $Format:%ai$ */