Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/integer/der_length_integer.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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10
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11 /**
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12 @file der_length_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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19 Gets length of DER encoding of num
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20 @param num The int 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_integer(void *num, unsigned long *outlen)
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25 {
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26 unsigned long z, len;
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27 int leading_zero;
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28
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29 LTC_ARGCHK(num != NULL);
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30 LTC_ARGCHK(outlen != NULL);
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31
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32 if (mp_cmp_d(num, 0) != LTC_MP_LT) {
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33 /* positive */
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34
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35 /* we only need a leading zero if the msb of the first byte is one */
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36 if ((mp_count_bits(num) & 7) == 0 || mp_iszero(num) == LTC_MP_YES) {
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37 leading_zero = 1;
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38 } else {
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39 leading_zero = 0;
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40 }
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41
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42 /* size for bignum */
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43 z = len = leading_zero + mp_unsigned_bin_size(num);
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44 } else {
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45 /* it's negative */
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46 /* find power of 2 that is a multiple of eight and greater than count bits */
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47 z = mp_count_bits(num);
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48 z = z + (8 - (z & 7));
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49 if (((mp_cnt_lsb(num)+1)==mp_count_bits(num)) && ((mp_count_bits(num)&7)==0)) --z;
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50 len = z = z >> 3;
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51 }
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52
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53 /* now we need a length */
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54 if (z < 128) {
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55 /* short form */
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56 ++len;
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57 } else {
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58 /* long form (relies on z != 0), assumes length bytes < 128 */
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59 ++len;
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60
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61 while (z) {
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62 ++len;
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63 z >>= 8;
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64 }
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65 }
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66
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67 /* we need a 0x02 to indicate it's INTEGER */
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68 ++len;
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69
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70 /* return length */
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71 *outlen = len;
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72 return CRYPT_OK;
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73 }
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75 #endif
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76
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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77 /* ref: $Format:%D$ */
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78 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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79 /* commit time: $Format:%ai$ */