Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.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_object_identifier.c
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13 ASN.1 DER, get length of Object Identifier, Tom St Denis
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14 */
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16 #ifdef LTC_DER
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18 unsigned long der_object_identifier_bits(unsigned long x)
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19 {
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20 unsigned long c;
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21 x &= 0xFFFFFFFF;
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22 c = 0;
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23 while (x) {
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24 ++c;
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25 x >>= 1;
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26 }
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27 return c;
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28 }
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31 /**
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32 Gets length of DER encoding of Object Identifier
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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33 @param nwords The number of OID words
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34 @param words The actual OID words to get the size of
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35 @param outlen [out] The length of the DER encoding for the given string
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36 @return CRYPT_OK if successful
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37 */
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38 int der_length_object_identifier(unsigned long *words, unsigned long nwords, unsigned long *outlen)
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39 {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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40 unsigned long y, z, t, wordbuf;
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42 LTC_ARGCHK(words != NULL);
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43 LTC_ARGCHK(outlen != NULL);
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45
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46 /* must be >= 2 words */
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47 if (nwords < 2) {
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48 return CRYPT_INVALID_ARG;
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49 }
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50
382
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51 /* word1 = 0,1,2,3 and word2 0..39 */
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52 if (words[0] > 3 || (words[0] < 2 && words[1] > 39)) {
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53 return CRYPT_INVALID_ARG;
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54 }
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55
382
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56 /* leading word is the first two */
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57 z = 0;
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58 wordbuf = words[0] * 40 + words[1];
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59 for (y = 1; y < nwords; y++) {
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60 t = der_object_identifier_bits(wordbuf);
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61 z += t/7 + ((t%7) ? 1 : 0) + (wordbuf == 0 ? 1 : 0);
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62 if (y < nwords - 1) {
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63 /* grab next word */
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64 wordbuf = words[y+1];
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65 }
285
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66 }
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67
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68 /* now depending on the length our length encoding changes */
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69 if (z < 128) {
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70 z += 2;
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71 } else if (z < 256) {
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72 z += 3;
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73 } else if (z < 65536UL) {
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74 z += 4;
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75 } else {
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76 return CRYPT_INVALID_ARG;
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77 }
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78
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79 *outlen = z;
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80 return CRYPT_OK;
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81 }
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82
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83 #endif
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84
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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85 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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86 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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87 /* commit time: $Format:%ai$ */