1 /*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/asn1t.h>
13
14 #ifndef NO_OLD_ASN1
15
ASN1_dup(i2d_of_void * i2d,d2i_of_void * d2i,const void * x)16 void *ASN1_dup(i2d_of_void *i2d, d2i_of_void *d2i, const void *x)
17 {
18 unsigned char *b, *p;
19 const unsigned char *p2;
20 int i;
21 char *ret;
22
23 if (x == NULL)
24 return NULL;
25
26 i = i2d(x, NULL);
27 if (i <= 0)
28 return NULL;
29
30 b = OPENSSL_malloc(i + 10);
31 if (b == NULL) {
32 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
33 return NULL;
34 }
35 p = b;
36 i = i2d(x, &p);
37 p2 = b;
38 ret = d2i(NULL, &p2, i);
39 OPENSSL_free(b);
40 return ret;
41 }
42
43 #endif
44
45 /*
46 * ASN1_ITEM version of dup: this follows the model above except we don't
47 * need to allocate the buffer. At some point this could be rewritten to
48 * directly dup the underlying structure instead of doing and encode and
49 * decode.
50 */
51
ASN1_item_dup(const ASN1_ITEM * it,const void * x)52 void *ASN1_item_dup(const ASN1_ITEM *it, const void *x)
53 {
54 ASN1_aux_cb *asn1_cb = NULL;
55 unsigned char *b = NULL;
56 const unsigned char *p;
57 long i;
58 ASN1_VALUE *ret;
59 OSSL_LIB_CTX *libctx = NULL;
60 const char *propq = NULL;
61
62 if (x == NULL)
63 return NULL;
64
65 if (it->itype == ASN1_ITYPE_SEQUENCE || it->itype == ASN1_ITYPE_CHOICE
66 || it->itype == ASN1_ITYPE_NDEF_SEQUENCE) {
67 const ASN1_AUX *aux = it->funcs;
68
69 asn1_cb = aux != NULL ? aux->asn1_cb : NULL;
70 }
71
72 if (asn1_cb != NULL) {
73 if (!asn1_cb(ASN1_OP_DUP_PRE, (ASN1_VALUE **)&x, it, NULL)
74 || !asn1_cb(ASN1_OP_GET0_LIBCTX, (ASN1_VALUE **)&x, it, &libctx)
75 || !asn1_cb(ASN1_OP_GET0_PROPQ, (ASN1_VALUE **)&x, it, &propq))
76 goto auxerr;
77 }
78
79 i = ASN1_item_i2d(x, &b, it);
80 if (b == NULL) {
81 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
82 return NULL;
83 }
84 p = b;
85 ret = ASN1_item_d2i_ex(NULL, &p, i, it, libctx, propq);
86 OPENSSL_free(b);
87
88 if (asn1_cb != NULL
89 && !asn1_cb(ASN1_OP_DUP_POST, &ret, it, (void *)x))
90 goto auxerr;
91
92 return ret;
93
94 auxerr:
95 ERR_raise_data(ERR_LIB_ASN1, ASN1_R_AUX_ERROR, "Type=%s", it->sname);
96 return NULL;
97 }
98