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
16void *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
52void *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