| // SPDX-License-Identifier: BSD-2-Clause |
| /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
| * |
| * LibTomCrypt is a library that provides various cryptographic |
| * algorithms in a highly modular and flexible manner. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| */ |
| #include "tomcrypt_private.h" |
| |
| /** |
| @file der_encode_set.c |
| ASN.1 DER, Encode a SET, Tom St Denis |
| */ |
| |
| #ifdef LTC_DER |
| |
| /* LTC define to ASN.1 TAG */ |
| static int _ltc_to_asn1(ltc_asn1_type v) |
| { |
| return der_asn1_type_to_identifier_map[v]; |
| } |
| |
| |
| static int _qsort_helper(const void *a, const void *b) |
| { |
| ltc_asn1_list *A = (ltc_asn1_list *)a, *B = (ltc_asn1_list *)b; |
| int r; |
| |
| r = _ltc_to_asn1(A->type) - _ltc_to_asn1(B->type); |
| |
| /* for QSORT the order is UNDEFINED if they are "equal" which means it is NOT DETERMINISTIC. So we force it to be :-) */ |
| if (r == 0) { |
| /* their order in the original list now determines the position */ |
| return A->used - B->used; |
| } |
| return r; |
| } |
| |
| /* |
| Encode a SET type |
| @param list The list of items to encode |
| @param inlen The number of items in the list |
| @param out [out] The destination |
| @param outlen [in/out] The size of the output |
| @return CRYPT_OK on success |
| */ |
| int der_encode_set(const ltc_asn1_list *list, unsigned long inlen, |
| unsigned char *out, unsigned long *outlen) |
| { |
| ltc_asn1_list *copy; |
| unsigned long x; |
| int err; |
| |
| /* make copy of list */ |
| copy = XCALLOC(inlen, sizeof(*copy)); |
| if (copy == NULL) { |
| return CRYPT_MEM; |
| } |
| |
| /* fill in used member with index so we can fully sort it */ |
| for (x = 0; x < inlen; x++) { |
| copy[x] = list[x]; |
| copy[x].used = x; |
| } |
| |
| /* sort it by the "type" field */ |
| XQSORT(copy, inlen, sizeof(*copy), &_qsort_helper); |
| |
| /* call der_encode_sequence_ex() */ |
| err = der_encode_sequence_ex(copy, inlen, out, outlen, LTC_ASN1_SET); |
| |
| /* free list */ |
| XFREE(copy); |
| |
| return err; |
| } |
| |
| |
| #endif |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |