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comparison libtomcrypt/src/pk/asn1/der/set/der_encode_set.c @ 399:a707e6148060

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merge of '5fdf69ca60d1683cdd9f4c2595134bed26394834' and '6b61c50f4cf888bea302ac8fcf5dbb573b443251'
author Matt Johnston <matt@ucc.asn.au>
date Sat, 03 Feb 2007 08:20:34 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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394:17d097fc111c 399:a707e6148060
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.com
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file der_encode_set.c
15 ASN.1 DER, Encode a SET, Tom St Denis
16 */
17
18 #ifdef LTC_DER
19
20 /* LTC define to ASN.1 TAG */
21 static int ltc_to_asn1(int v)
22 {
23 switch (v) {
24 case LTC_ASN1_BOOLEAN: return 0x01;
25 case LTC_ASN1_INTEGER:
26 case LTC_ASN1_SHORT_INTEGER: return 0x02;
27 case LTC_ASN1_BIT_STRING: return 0x03;
28 case LTC_ASN1_OCTET_STRING: return 0x04;
29 case LTC_ASN1_NULL: return 0x05;
30 case LTC_ASN1_OBJECT_IDENTIFIER: return 0x06;
31 case LTC_ASN1_UTF8_STRING: return 0x0C;
32 case LTC_ASN1_PRINTABLE_STRING: return 0x13;
33 case LTC_ASN1_IA5_STRING: return 0x16;
34 case LTC_ASN1_UTCTIME: return 0x17;
35 case LTC_ASN1_SEQUENCE: return 0x30;
36 case LTC_ASN1_SET:
37 case LTC_ASN1_SETOF: return 0x31;
38 default: return -1;
39 }
40 }
41
42
43 static int qsort_helper(const void *a, const void *b)
44 {
45 ltc_asn1_list *A = (ltc_asn1_list *)a, *B = (ltc_asn1_list *)b;
46 int r;
47
48 r = ltc_to_asn1(A->type) - ltc_to_asn1(B->type);
49
50 /* for QSORT the order is UNDEFINED if they are "equal" which means it is NOT DETERMINISTIC. So we force it to be :-) */
51 if (r == 0) {
52 /* their order in the original list now determines the position */
53 return A->used - B->used;
54 } else {
55 return r;
56 }
57 }
58
59 /*
60 Encode a SET type
61 @param list The list of items to encode
62 @param inlen The number of items in the list
63 @param out [out] The destination
64 @param outlen [in/out] The size of the output
65 @return CRYPT_OK on success
66 */
67 int der_encode_set(ltc_asn1_list *list, unsigned long inlen,
68 unsigned char *out, unsigned long *outlen)
69 {
70 ltc_asn1_list *copy;
71 unsigned long x;
72 int err;
73
74 /* make copy of list */
75 copy = XCALLOC(inlen, sizeof(*copy));
76 if (copy == NULL) {
77 return CRYPT_MEM;
78 }
79
80 /* fill in used member with index so we can fully sort it */
81 for (x = 0; x < inlen; x++) {
82 copy[x] = list[x];
83 copy[x].used = x;
84 }
85
86 /* sort it by the "type" field */
87 XQSORT(copy, inlen, sizeof(*copy), &qsort_helper);
88
89 /* call der_encode_sequence_ex() */
90 err = der_encode_sequence_ex(copy, inlen, out, outlen, LTC_ASN1_SET);
91
92 /* free list */
93 XFREE(copy);
94
95 return err;
96 }
97
98
99 #endif
100
101 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/set/der_encode_set.c,v $ */
102 /* $Revision: 1.11 $ */
103 /* $Date: 2006/11/26 02:27:37 $ */