Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/set/der_encode_set.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
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382
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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_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
382
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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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83 }
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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 }
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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: $Format:%ai$ */