/* $OpenBSD: a_pkey.c,v 1.3 2021/12/25 13:17:48 jsing Exp $ */

/* 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 <openssl/opensslconf.h>

#include <openssl/asn1.h>

#include <openssl/bn.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

#ifndef OPENSSL_NO_ENGINE

#include <openssl/engine.h>

#endif

#include "asn1_locl.h"

#include "evp_locl.h"

EVP_PKEY *

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

{

  const unsigned char *p = *pp;

  EVP_PKEY *ret;

  if ((a == NULL) || (*a == NULL)) {

    if ((ret = EVP_PKEY_new()) == NULL) {

      ASN1error(ERR_R_EVP_LIB);

      return (NULL);

    }

  } else {

    ret = *a;

#ifndef OPENSSL_NO_ENGINE

    ENGINE_finish(ret->engine);

    ret->engine = NULL;

#endif

  }

  if (!EVP_PKEY_set_type(ret, type)) {

    ASN1error(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;

      *pp = p; /* XXX */

      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 {

      ASN1error(ERR_R_ASN1_LIB);

      goto err;

    }

  }

  if (a != NULL)

    (*a) = ret;

  return (ret);

 err:

  if (a == NULL || *a != ret)

    EVP_PKEY_free(ret);

  return (NULL);

}

int

i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp)

{

  if (a->ameth && a->ameth->old_priv_encode) {

    return a->ameth->old_priv_encode(a, pp);

  }

  if (a->ameth && a->ameth->priv_encode) {

    PKCS8_PRIV_KEY_INFO *p8 = EVP_PKEY2PKCS8(a);

    int ret = i2d_PKCS8_PRIV_KEY_INFO(p8, pp);

    PKCS8_PRIV_KEY_INFO_free(p8);

    return ret;

  }

  ASN1error(ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);

  return (-1);

}

/* 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) {

      ASN1error(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);

}