Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 *
382
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file der_length_object_identifier.c
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15 ASN.1 DER, get length of Object Identifier, Tom St Denis
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16 */
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17
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18 #ifdef LTC_DER
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19
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20 unsigned long der_object_identifier_bits(unsigned long x)
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21 {
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22 unsigned long c;
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23 x &= 0xFFFFFFFF;
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24 c = 0;
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25 while (x) {
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26 ++c;
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27 x >>= 1;
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28 }
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29 return c;
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30 }
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31
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32
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33 /**
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34 Gets length of DER encoding of Object Identifier
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35 @param nwords The number of OID words
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36 @param words The actual OID words to get the size of
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37 @param outlen [out] The length of the DER encoding for the given string
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38 @return CRYPT_OK if successful
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39 */
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40 int der_length_object_identifier(unsigned long *words, unsigned long nwords, unsigned long *outlen)
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41 {
382
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42 unsigned long y, z, t, wordbuf;
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43
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44 LTC_ARGCHK(words != NULL);
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45 LTC_ARGCHK(outlen != NULL);
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46
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47
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48 /* must be >= 2 words */
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49 if (nwords < 2) {
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50 return CRYPT_INVALID_ARG;
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51 }
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52
382
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53 /* word1 = 0,1,2,3 and word2 0..39 */
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54 if (words[0] > 3 || (words[0] < 2 && words[1] > 39)) {
285
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55 return CRYPT_INVALID_ARG;
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56 }
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57
382
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58 /* leading word is the first two */
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59 z = 0;
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60 wordbuf = words[0] * 40 + words[1];
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61 for (y = 1; y < nwords; y++) {
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62 t = der_object_identifier_bits(wordbuf);
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63 z += t/7 + ((t%7) ? 1 : 0) + (wordbuf == 0 ? 1 : 0);
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64 if (y < nwords - 1) {
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65 /* grab next word */
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66 wordbuf = words[y+1];
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67 }
285
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68 }
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69
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70 /* now depending on the length our length encoding changes */
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71 if (z < 128) {
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72 z += 2;
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73 } else if (z < 256) {
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74 z += 3;
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75 } else if (z < 65536UL) {
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76 z += 4;
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77 } else {
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78 return CRYPT_INVALID_ARG;
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79 }
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80
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81 *outlen = z;
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82 return CRYPT_OK;
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83 }
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84
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85 #endif
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86
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87 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c,v $ */
382
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88 /* $Revision: 1.4 $ */
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89 /* $Date: 2006/04/16 20:17:42 $ */