crypto/asn1/d2i_param.c

   1 /*
   2  * Copyright 2019 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/evp.h>
  13 #include <openssl/asn1.h>
  14 #include "internal/evp_int.h"
  15 #include "internal/asn1_int.h"
  16
  17 EVP_PKEY *d2i_KeyParams(int type, EVP_PKEY **a, const unsigned char **pp,
  18                         long length)
  19 {
  20     EVP_PKEY *ret = NULL;
  21     const unsigned char *p = *pp;
  22
  23     if ((a == NULL) || (*a == NULL)) {
  24         if ((ret = EVP_PKEY_new()) == NULL)
  25             return NULL;
  26     } else
  27         ret = *a;
  28
  29     if (type != EVP_PKEY_id(ret) && !EVP_PKEY_set_type(ret, type))
  30         goto err;
  31
  32     if (ret->ameth == NULL || ret->ameth->param_decode == NULL) {
  33         ASN1err(ASN1_F_D2I_KEYPARAMS, ASN1_R_UNSUPPORTED_TYPE);
  34         goto err;
  35     }
  36
  37     if (!ret->ameth->param_decode(ret, &p, length))
  38         goto err;
  39
  40     if (a != NULL)
  41         (*a) = ret;
  42     return ret;
  43 err:
  44     if (a == NULL || *a != ret)
  45         EVP_PKEY_free(ret);
  46     return NULL;
  47 }
  48
  49 EVP_PKEY *d2i_KeyParams_bio(int type, EVP_PKEY **a, BIO *in)
  50 {
  51     BUF_MEM *b = NULL;
  52     const unsigned char *p;
  53     void *ret = NULL;
  54     int len;
  55
  56     len = asn1_d2i_read_bio(in, &b);
  57     if (len < 0)
  58         goto err;
  59
  60     p = (unsigned char *)b->data;
  61     ret = d2i_KeyParams(type, a, &p, len);
  62 err:
  63     BUF_MEM_free(b);
  64     return ret;
  65 }