crypto/asn1/d2i_pu.c

   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
  28 EVP_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 }