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annotate src/pk/asn1/der/object_identifier/der_encode_object_identifier.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16

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Update to LibTomCrypt 1.16
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:22:00 +0000
parents 59400faa4b44
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 * 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_encode_object_identifier.c
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15 ASN.1 DER, Encode 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 Encode an OID
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21 @param words The words to encode (upto 32-bits each)
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22 @param nwords The number of words in the OID
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23 @param out [out] Destination of OID data
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24 @param outlen [in/out] The max and resulting size of the OID
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25 @return CRYPT_OK if successful
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26 */
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27 int der_encode_object_identifier(unsigned long *words, unsigned long nwords,
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28 unsigned char *out, unsigned long *outlen)
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29 {
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30 unsigned long i, x, y, z, t, mask, wordbuf;
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31 int err;
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32
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33 LTC_ARGCHK(words != NULL);
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34 LTC_ARGCHK(out != NULL);
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35 LTC_ARGCHK(outlen != NULL);
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36
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37 /* check length */
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38 if ((err = der_length_object_identifier(words, nwords, &x)) != CRYPT_OK) {
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39 return err;
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40 }
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41 if (x > *outlen) {
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42 *outlen = x;
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43 return CRYPT_BUFFER_OVERFLOW;
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44 }
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45
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46 /* compute length to store OID data */
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47 z = 0;
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48 wordbuf = words[0] * 40 + words[1];
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49 for (y = 1; y < nwords; y++) {
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50 t = der_object_identifier_bits(wordbuf);
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51 z += t/7 + ((t%7) ? 1 : 0) + (wordbuf == 0 ? 1 : 0);
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52 if (y < nwords - 1) {
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53 wordbuf = words[y + 1];
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54 }
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55 }
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56
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57 /* store header + length */
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58 x = 0;
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59 out[x++] = 0x06;
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60 if (z < 128) {
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61 out[x++] = (unsigned char)z;
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62 } else if (z < 256) {
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63 out[x++] = 0x81;
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64 out[x++] = (unsigned char)z;
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65 } else if (z < 65536UL) {
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66 out[x++] = 0x82;
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67 out[x++] = (unsigned char)((z>>8)&255);
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68 out[x++] = (unsigned char)(z&255);
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69 } else {
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70 return CRYPT_INVALID_ARG;
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71 }
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72
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73 /* store first byte */
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74 wordbuf = words[0] * 40 + words[1];
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75 for (i = 1; i < nwords; i++) {
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76 /* store 7 bit words in little endian */
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77 t = wordbuf & 0xFFFFFFFF;
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78 if (t) {
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79 y = x;
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80 mask = 0;
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81 while (t) {
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82 out[x++] = (unsigned char)((t & 0x7F) | mask);
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83 t >>= 7;
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84 mask |= 0x80; /* upper bit is set on all but the last byte */
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85 }
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86 /* now swap bytes y...x-1 */
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87 z = x - 1;
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88 while (y < z) {
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89 t = out[y]; out[y] = out[z]; out[z] = (unsigned char)t;
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90 ++y;
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91 --z;
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92 }
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93 } else {
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94 /* zero word */
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95 out[x++] = 0x00;
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96 }
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97
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98 if (i < nwords - 1) {
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99 wordbuf = words[i + 1];
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100 }
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101 }
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102
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103 *outlen = x;
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104 return CRYPT_OK;
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105 }
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106
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107 #endif
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108
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109 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.c,v $ */
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110 /* $Revision: 1.6 $ */
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111 /* $Date: 2006/12/04 21:34:03 $ */