Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/set/der_encode_set.c @ 1772:0cc85b4a4abb

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Move fuzzer-kex initialisation into a constructor function Hopefully this can avoid hitting AFL timeouts https://github.com/google/oss-fuzz/pull/2474
author Matt Johnston <matt@ucc.asn.au>
date Thu, 29 Oct 2020 23:00:52 +0800
parents 6dba84798cd5
children
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382
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diff changeset
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_set.c
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13 ASN.1 DER, Encode a SET, 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 /* LTC define to ASN.1 TAG */
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19 static int _ltc_to_asn1(ltc_asn1_type v)
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20 {
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21 switch (v) {
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22 case LTC_ASN1_BOOLEAN: return 0x01;
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23 case LTC_ASN1_INTEGER:
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24 case LTC_ASN1_SHORT_INTEGER: return 0x02;
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25 case LTC_ASN1_RAW_BIT_STRING:
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26 case LTC_ASN1_BIT_STRING: return 0x03;
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27 case LTC_ASN1_OCTET_STRING: return 0x04;
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28 case LTC_ASN1_NULL: return 0x05;
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29 case LTC_ASN1_OBJECT_IDENTIFIER: return 0x06;
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30 case LTC_ASN1_UTF8_STRING: return 0x0C;
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31 case LTC_ASN1_PRINTABLE_STRING: return 0x13;
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32 case LTC_ASN1_TELETEX_STRING: return 0x14;
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33 case LTC_ASN1_IA5_STRING: return 0x16;
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34 case LTC_ASN1_UTCTIME: return 0x17;
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35 case LTC_ASN1_GENERALIZEDTIME: return 0x18;
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36 case LTC_ASN1_SEQUENCE: return 0x30;
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37 case LTC_ASN1_SET:
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38 case LTC_ASN1_SETOF: return 0x31;
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39 case LTC_ASN1_CHOICE:
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40 case LTC_ASN1_CONSTRUCTED:
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41 case LTC_ASN1_CONTEXT_SPECIFIC:
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42 case LTC_ASN1_EOL: return -1;
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43 }
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44 return -1;
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45 }
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46
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47
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48 static int _qsort_helper(const void *a, const void *b)
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49 {
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50 ltc_asn1_list *A = (ltc_asn1_list *)a, *B = (ltc_asn1_list *)b;
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51 int r;
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52
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53 r = _ltc_to_asn1(A->type) - _ltc_to_asn1(B->type);
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54
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55 /* for QSORT the order is UNDEFINED if they are "equal" which means it is NOT DETERMINISTIC. So we force it to be :-) */
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56 if (r == 0) {
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57 /* their order in the original list now determines the position */
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58 return A->used - B->used;
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59 } else {
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60 return r;
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61 }
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62 }
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63
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64 /*
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65 Encode a SET type
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66 @param list The list of items to encode
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67 @param inlen The number of items in the list
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68 @param out [out] The destination
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69 @param outlen [in/out] The size of the output
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70 @return CRYPT_OK on success
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71 */
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72 int der_encode_set(ltc_asn1_list *list, unsigned long inlen,
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73 unsigned char *out, unsigned long *outlen)
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74 {
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75 ltc_asn1_list *copy;
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76 unsigned long x;
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77 int err;
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78
382
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79 /* make copy of list */
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80 copy = XCALLOC(inlen, sizeof(*copy));
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81 if (copy == NULL) {
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82 return CRYPT_MEM;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84
382
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85 /* fill in used member with index so we can fully sort it */
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86 for (x = 0; x < inlen; x++) {
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87 copy[x] = list[x];
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88 copy[x].used = x;
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89 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90
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91 /* sort it by the "type" field */
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92 XQSORT(copy, inlen, sizeof(*copy), &_qsort_helper);
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93
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94 /* call der_encode_sequence_ex() */
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95 err = der_encode_sequence_ex(copy, inlen, out, outlen, LTC_ASN1_SET);
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96
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97 /* free list */
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98 XFREE(copy);
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99
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100 return err;
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101 }
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102
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103
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104 #endif
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105
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106 /* ref: $Format:%D$ */
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107 /* git commit: $Format:%H$ */
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108 /* commit time: $Format:%ai$ */