Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.c @ 1612:470aa609c7e4

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 24 Jul 2018 20:19:05 +0800
parents 6dba84798cd5
children
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rev   line source
285
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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_encode_object_identifier.c
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13 ASN.1 DER, Encode Object Identifier, Tom St Denis
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14 */
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15
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16 #ifdef LTC_DER
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17 /**
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18 Encode an OID
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19 @param words The words to encode (upto 32-bits each)
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20 @param nwords The number of words in the OID
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21 @param out [out] Destination of OID data
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22 @param outlen [in/out] The max and resulting size of the OID
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23 @return CRYPT_OK if successful
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24 */
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25 int der_encode_object_identifier(unsigned long *words, unsigned long nwords,
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26 unsigned char *out, unsigned long *outlen)
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27 {
382
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28 unsigned long i, x, y, z, t, mask, wordbuf;
285
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29 int err;
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30
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31 LTC_ARGCHK(words != NULL);
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32 LTC_ARGCHK(out != NULL);
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33 LTC_ARGCHK(outlen != NULL);
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34
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35 /* check length */
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36 if ((err = der_length_object_identifier(words, nwords, &x)) != CRYPT_OK) {
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37 return err;
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38 }
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39 if (x > *outlen) {
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40 *outlen = x;
285
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41 return CRYPT_BUFFER_OVERFLOW;
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42 }
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43
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44 /* compute length to store OID data */
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45 z = 0;
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46 wordbuf = words[0] * 40 + words[1];
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47 for (y = 1; y < nwords; y++) {
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48 t = der_object_identifier_bits(wordbuf);
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49 z += t/7 + ((t%7) ? 1 : 0) + (wordbuf == 0 ? 1 : 0);
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50 if (y < nwords - 1) {
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51 wordbuf = words[y + 1];
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52 }
285
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53 }
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54
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55 /* store header + length */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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56 x = 0;
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57 out[x++] = 0x06;
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58 if (z < 128) {
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59 out[x++] = (unsigned char)z;
285
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60 } else if (z < 256) {
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61 out[x++] = 0x81;
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62 out[x++] = (unsigned char)z;
285
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63 } else if (z < 65536UL) {
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64 out[x++] = 0x82;
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65 out[x++] = (unsigned char)((z>>8)&255);
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66 out[x++] = (unsigned char)(z&255);
285
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67 } else {
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68 return CRYPT_INVALID_ARG;
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69 }
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70
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71 /* store first byte */
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72 wordbuf = words[0] * 40 + words[1];
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73 for (i = 1; i < nwords; i++) {
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74 /* store 7 bit words in little endian */
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75 t = wordbuf & 0xFFFFFFFF;
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76 if (t) {
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77 y = x;
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78 mask = 0;
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79 while (t) {
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80 out[x++] = (unsigned char)((t & 0x7F) | mask);
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81 t >>= 7;
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82 mask |= 0x80; /* upper bit is set on all but the last byte */
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83 }
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84 /* now swap bytes y...x-1 */
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85 z = x - 1;
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86 while (y < z) {
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87 t = out[y]; out[y] = out[z]; out[z] = (unsigned char)t;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 ++y;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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89 --z;
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90 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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91 } else {
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92 /* zero word */
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93 out[x++] = 0x00;
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94 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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95
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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96 if (i < nwords - 1) {
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97 wordbuf = words[i + 1];
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98 }
285
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99 }
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100
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101 *outlen = x;
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102 return CRYPT_OK;
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103 }
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104
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105 #endif
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106
1471
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107 /* ref: $Format:%D$ */
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108 /* git commit: $Format:%H$ */
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109 /* commit time: $Format:%ai$ */