/* 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;

    const unsigned char *p = *pp;

    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, &p, length)) {

        if (ret->ameth->priv_decode) {

            EVP_PKEY *tmp;

            PKCS8_PRIV_KEY_INFO *p8 = NULL;

            p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);

            if (!p8)

                goto err;

            tmp = EVP_PKCS82PKEY(p8);

            PKCS8_PRIV_KEY_INFO_free(p8);

            if (tmp == NULL)

                goto err;

            EVP_PKEY_free(ret);

            ret = tmp;

        } else {

            ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);

            goto err;

        }

    }

    *pp = p;

    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);

    p = *pp;

    /*

     * 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, &p, 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 (ret == NULL)

            return NULL;

        *pp = p;

        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);

}