/* 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 "internal/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 "internal/asn1_int.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) {
            PKCS8_PRIV_KEY_INFO *p8 = NULL;
            p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
            if (!p8)
                goto err;
            EVP_PKEY_free(ret);
            ret = EVP_PKCS82PKEY(p8);
            PKCS8_PRIV_KEY_INFO_free(p8);
            if (ret == NULL)
                goto err;
        } else {
            ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);
            goto err;
        }
    }
    *pp = p;
    if (a != NULL)
        (*a) = ret;
    return (ret);
 err:
    if (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);
}