Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +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 {
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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
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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 }
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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: $Format:%ai$ */