Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/set/der_encode_set.c @ 1303:eed9376a4ad6

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improve algorithm list parsing
author Matt Johnston <matt@ucc.asn.au>
date Mon, 11 Jul 2016 22:40:38 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 * 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_set.c
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15 ASN.1 DER, Encode a SET, 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 /* LTC define to ASN.1 TAG */
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21 static int ltc_to_asn1(int v)
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22 {
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23 switch (v) {
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24 case LTC_ASN1_BOOLEAN: return 0x01;
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25 case LTC_ASN1_INTEGER:
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26 case LTC_ASN1_SHORT_INTEGER: return 0x02;
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27 case LTC_ASN1_BIT_STRING: return 0x03;
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28 case LTC_ASN1_OCTET_STRING: return 0x04;
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29 case LTC_ASN1_NULL: return 0x05;
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30 case LTC_ASN1_OBJECT_IDENTIFIER: return 0x06;
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31 case LTC_ASN1_UTF8_STRING: return 0x0C;
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32 case LTC_ASN1_PRINTABLE_STRING: return 0x13;
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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_SEQUENCE: return 0x30;
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36 case LTC_ASN1_SET:
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37 case LTC_ASN1_SETOF: return 0x31;
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38 default: return -1;
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39 }
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40 }
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41
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42
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43 static int qsort_helper(const void *a, const void *b)
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44 {
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45 ltc_asn1_list *A = (ltc_asn1_list *)a, *B = (ltc_asn1_list *)b;
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46 int r;
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47
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48 r = ltc_to_asn1(A->type) - ltc_to_asn1(B->type);
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49
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50 /* 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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51 if (r == 0) {
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52 /* their order in the original list now determines the position */
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53 return A->used - B->used;
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54 } else {
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55 return r;
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56 }
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57 }
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58
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59 /*
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60 Encode a SET type
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61 @param list The list of items to encode
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62 @param inlen The number of items in the list
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63 @param out [out] The destination
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64 @param outlen [in/out] The size of the output
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65 @return CRYPT_OK on success
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66 */
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67 int der_encode_set(ltc_asn1_list *list, unsigned long inlen,
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68 unsigned char *out, unsigned long *outlen)
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69 {
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70 ltc_asn1_list *copy;
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71 unsigned long x;
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72 int err;
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73
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74 /* make copy of list */
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75 copy = XCALLOC(inlen, sizeof(*copy));
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76 if (copy == NULL) {
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77 return CRYPT_MEM;
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78 }
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79
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80 /* fill in used member with index so we can fully sort it */
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81 for (x = 0; x < inlen; x++) {
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82 copy[x] = list[x];
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83 copy[x].used = x;
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84 }
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85
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 /* sort it by the "type" field */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 XQSORT(copy, inlen, sizeof(*copy), &qsort_helper);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 /* call der_encode_sequence_ex() */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 err = der_encode_sequence_ex(copy, inlen, out, outlen, LTC_ASN1_SET);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 /* free list */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 XFREE(copy);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/set/der_encode_set.c,v $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 /* $Revision: 1.11 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 /* $Date: 2006/11/26 02:27:37 $ */