Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c @ 850:7507b174bba0 ecc

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- Make curve25519 work after fixing a typo, interoperates with OpenSSH - comment on ecc binary size effects
author Matt Johnston <matt@ucc.asn.au>
date Sat, 09 Nov 2013 00:02:26 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 * 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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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 {
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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
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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)) {
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55 return CRYPT_INVALID_ARG;
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56 }
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57
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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 }
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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 $ */
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88 /* $Revision: 1.4 $ */
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89 /* $Date: 2006/04/16 20:17:42 $ */