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d2i_pr.c
/* crypto/asn1/d2i_pr.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include <openssl/x509.h>
#include <openssl/asn1.h>
#include "asn1_locl.h"

EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
           long length)
      {
      EVP_PKEY *ret;

      if ((a == NULL) || (*a == NULL))
            {
            if ((ret=EVP_PKEY_new()) == NULL)
                  {
                  ASN1err(ASN1_F_D2I_PRIVATEKEY,ERR_R_EVP_LIB);
                  return(NULL);
                  }
            }
      else
            {
            ret= *a;
#ifndef OPENSSL_NO_ENGINE
            if (ret->engine)
                  {
                  ENGINE_finish(ret->engine);
                  ret->engine = NULL;
                  }
#endif
            }

      if (!EVP_PKEY_set_type(ret, type))
            {
            ASN1err(ASN1_F_D2I_PRIVATEKEY,ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);
            goto err;
            }

      if (!ret->ameth->old_priv_decode ||
                  !ret->ameth->old_priv_decode(ret, pp, length))
            {
            if (ret->ameth->priv_decode) 
                  {
                  PKCS8_PRIV_KEY_INFO *p8=NULL;
                  p8=d2i_PKCS8_PRIV_KEY_INFO(NULL,pp,length);
                  if (!p8) goto err;
                  EVP_PKEY_free(ret);
                  ret = EVP_PKCS82PKEY(p8);
                  PKCS8_PRIV_KEY_INFO_free(p8);

                  } 
            else 
                  {
                  ASN1err(ASN1_F_D2I_PRIVATEKEY,ERR_R_ASN1_LIB);
                  goto err;
                  }
            }     
      if (a != NULL) (*a)=ret;
      return(ret);
err:
      if ((ret != NULL) && ((a == NULL) || (*a != ret))) EVP_PKEY_free(ret);
      return(NULL);
      }

/* This works like d2i_PrivateKey() except it automatically works out the type */

EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
           long length)
{
      STACK_OF(ASN1_TYPE) *inkey;
      const unsigned char *p;
      int keytype;
      p = *pp;
      /* Dirty trick: read in the ASN1 data into a STACK_OF(ASN1_TYPE):
       * by analyzing it we can determine the passed structure: this
       * assumes the input is surrounded by an ASN1 SEQUENCE.
       */
      inkey = d2i_ASN1_SEQUENCE_ANY(NULL, &p, length);
      /* Since we only need to discern "traditional format" RSA and DSA
       * keys we can just count the elements.
         */
      if(sk_ASN1_TYPE_num(inkey) == 6) 
            keytype = EVP_PKEY_DSA;
      else if (sk_ASN1_TYPE_num(inkey) == 4)
            keytype = EVP_PKEY_EC;
      else if (sk_ASN1_TYPE_num(inkey) == 3)  
            { /* This seems to be PKCS8, not traditional format */
                  PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL,pp,length);
                  EVP_PKEY *ret;

                  sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
                  if (!p8) 
                        {
                        ASN1err(ASN1_F_D2I_AUTOPRIVATEKEY,ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
                        return NULL;
                        }
                  ret = EVP_PKCS82PKEY(p8);
                  PKCS8_PRIV_KEY_INFO_free(p8);
                  if (a) {
                        *a = ret;
                  }     
                  return ret;
            }
      else keytype = EVP_PKEY_RSA;
      sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
      return d2i_PrivateKey(keytype, a, pp, length);
}

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