Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +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
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: $Format:%ai$ */