1/*
2 * Copyright 1995-2022 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/*
11 * DSA low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14#include "internal/deprecated.h"
15
16#include <stdio.h>
17#include "internal/cryptlib.h"
18#include <openssl/bn.h>
19#include <openssl/evp.h>
20#include <openssl/objects.h>
21#include <openssl/asn1.h>
22#include <openssl/rsa.h>
23#include <openssl/dsa.h>
24#include <openssl/ec.h>
25
26#include "crypto/evp.h"
27
28EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp,
29                        long length)
30{
31    EVP_PKEY *ret;
32    EVP_PKEY *copy = NULL;
33
34    if ((a == NULL) || (*a == NULL)) {
35        if ((ret = EVP_PKEY_new()) == NULL) {
36            ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
37            return NULL;
38        }
39    } else {
40        ret = *a;
41
42#ifndef OPENSSL_NO_EC
43        if (evp_pkey_is_provided(ret)
44            && EVP_PKEY_get_base_id(ret) == EVP_PKEY_EC) {
45            if (!evp_pkey_copy_downgraded(&copy, ret))
46                goto err;
47        }
48#endif
49    }
50
51    if ((type != EVP_PKEY_get_id(ret) || copy != NULL)
52        && !EVP_PKEY_set_type(ret, type)) {
53        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
54        goto err;
55    }
56
57    switch (EVP_PKEY_get_base_id(ret)) {
58    case EVP_PKEY_RSA:
59        if ((ret->pkey.rsa = d2i_RSAPublicKey(NULL, pp, length)) == NULL) {
60            ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
61            goto err;
62        }
63        break;
64#ifndef OPENSSL_NO_DSA
65    case EVP_PKEY_DSA:
66        if (!d2i_DSAPublicKey(&ret->pkey.dsa, pp, length)) {
67            ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
68            goto err;
69        }
70        break;
71#endif
72#ifndef OPENSSL_NO_EC
73    case EVP_PKEY_EC:
74        if (copy != NULL) {
75            /* use downgraded parameters from copy */
76            ret->pkey.ec = copy->pkey.ec;
77            copy->pkey.ec = NULL;
78        }
79        if (!o2i_ECPublicKey(&ret->pkey.ec, pp, length)) {
80            ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
81            goto err;
82        }
83        break;
84#endif
85    default:
86        ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);
87        goto err;
88    }
89    if (a != NULL)
90        (*a) = ret;
91    EVP_PKEY_free(copy);
92    return ret;
93 err:
94    if (a == NULL || *a != ret)
95        EVP_PKEY_free(ret);
96    EVP_PKEY_free(copy);
97    return NULL;
98}
99