/* crypto/evp/p_lib.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/err.h>

#include <openssl/objects.h>

#include <openssl/evp.h>

#include <openssl/asn1_mac.h>

#include <openssl/x509.h>

#ifndef OPENSSL_NO_RSA

# include <openssl/rsa.h>

#endif

#ifndef OPENSSL_NO_DSA

# include <openssl/dsa.h>

#endif

#ifndef OPENSSL_NO_DH

# include <openssl/dh.h>

#endif

#ifndef OPENSSL_NO_ENGINE

# include <openssl/engine.h>

#endif

#include "asn1_locl.h"

static void EVP_PKEY_free_it(EVP_PKEY *x);

int EVP_PKEY_bits(EVP_PKEY *pkey)

{

    if (pkey && pkey->ameth && pkey->ameth->pkey_bits)

        return pkey->ameth->pkey_bits(pkey);

    return 0;

}

int EVP_PKEY_size(EVP_PKEY *pkey)

{

    if (pkey && pkey->ameth && pkey->ameth->pkey_size)

        return pkey->ameth->pkey_size(pkey);

    return 0;

}

int EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)

{

#ifndef OPENSSL_NO_DSA

    if (pkey->type == EVP_PKEY_DSA) {

        int ret = pkey->save_parameters;

        if (mode >= 0)

            pkey->save_parameters = mode;

        return (ret);

    }

#endif

#ifndef OPENSSL_NO_EC

    if (pkey->type == EVP_PKEY_EC) {

        int ret = pkey->save_parameters;

        if (mode >= 0)

            pkey->save_parameters = mode;

        return (ret);

    }

#endif

    return (0);

}

int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)

{

    if (to->type != from->type) {

        EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_KEY_TYPES);

        goto err;

    }

    if (EVP_PKEY_missing_parameters(from)) {

        EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_MISSING_PARAMETERS);

        goto err;

    }

    if (!EVP_PKEY_missing_parameters(to)) {

        if (EVP_PKEY_cmp_parameters(to, from) == 1)

            return 1;

        EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_PARAMETERS);

        return 0;

    }

    if (from->ameth && from->ameth->param_copy)

        return from->ameth->param_copy(to, from);

 err:

    return 0;

}

int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)

{

    if (pkey->ameth && pkey->ameth->param_missing)

        return pkey->ameth->param_missing(pkey);

    return 0;

}

int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)

{

    if (a->type != b->type)

        return -1;

    if (a->ameth && a->ameth->param_cmp)

        return a->ameth->param_cmp(a, b);

    return -2;

}

int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)

{

    if (a->type != b->type)

        return -1;

    if (a->ameth) {

        int ret;

        /* Compare parameters if the algorithm has them */

        if (a->ameth->param_cmp) {

            ret = a->ameth->param_cmp(a, b);

            if (ret <= 0)

                return ret;

        }

        if (a->ameth->pub_cmp)

            return a->ameth->pub_cmp(a, b);

    }

    return -2;

}

EVP_PKEY *EVP_PKEY_new(void)

{

    EVP_PKEY *ret;

    ret = (EVP_PKEY *)OPENSSL_malloc(sizeof(EVP_PKEY));

    if (ret == NULL) {

        EVPerr(EVP_F_EVP_PKEY_NEW, ERR_R_MALLOC_FAILURE);

        return (NULL);

    }

    ret->type = EVP_PKEY_NONE;

    ret->save_type = EVP_PKEY_NONE;

    ret->references = 1;

    ret->ameth = NULL;

    ret->engine = NULL;

    ret->pkey.ptr = NULL;

    ret->attributes = NULL;

    ret->save_parameters = 1;

    return (ret);

}

/*

 * Setup a public key ASN1 method and ENGINE from a NID or a string. If pkey

 * is NULL just return 1 or 0 if the algorithm exists.

 */

static int pkey_set_type(EVP_PKEY *pkey, int type, const char *str, int len)

{

    const EVP_PKEY_ASN1_METHOD *ameth;

    ENGINE *e = NULL;

    if (pkey) {

        if (pkey->pkey.ptr)

            EVP_PKEY_free_it(pkey);

        /*

         * If key type matches and a method exists then this lookup has

         * succeeded once so just indicate success.

         */

        if ((type == pkey->save_type) && pkey->ameth)

            return 1;

#ifndef OPENSSL_NO_ENGINE

        /* If we have an ENGINE release it */

        if (pkey->engine) {

            ENGINE_finish(pkey->engine);

            pkey->engine = NULL;

        }

#endif

    }

    if (str)

        ameth = EVP_PKEY_asn1_find_str(&e, str, len);

    else

        ameth = EVP_PKEY_asn1_find(&e, type);

#ifndef OPENSSL_NO_ENGINE

    if (!pkey && e)

        ENGINE_finish(e);

#endif

    if (!ameth) {

        EVPerr(EVP_F_PKEY_SET_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);

        return 0;

    }

    if (pkey) {

        pkey->ameth = ameth;

        pkey->engine = e;

        pkey->type = pkey->ameth->pkey_id;

        pkey->save_type = type;

    }

    return 1;

}

int EVP_PKEY_set_type(EVP_PKEY *pkey, int type)

{

    return pkey_set_type(pkey, type, NULL, -1);

}

int EVP_PKEY_set_type_str(EVP_PKEY *pkey, const char *str, int len)

{

    return pkey_set_type(pkey, EVP_PKEY_NONE, str, len);

}

int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key)

{

    if (pkey == NULL || !EVP_PKEY_set_type(pkey, type))

        return 0;

    pkey->pkey.ptr = key;

    return (key != NULL);

}

void *EVP_PKEY_get0(EVP_PKEY *pkey)

{

    return pkey->pkey.ptr;

}

#ifndef OPENSSL_NO_RSA

int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key)

{

    int ret = EVP_PKEY_assign_RSA(pkey, key);

    if (ret)

        RSA_up_ref(key);

    return ret;

}

RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey)

{

    if (pkey->type != EVP_PKEY_RSA) {

        EVPerr(EVP_F_EVP_PKEY_GET1_RSA, EVP_R_EXPECTING_AN_RSA_KEY);

        return NULL;

    }

    RSA_up_ref(pkey->pkey.rsa);

    return pkey->pkey.rsa;

}

#endif

#ifndef OPENSSL_NO_DSA

int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key)

{

    int ret = EVP_PKEY_assign_DSA(pkey, key);

    if (ret)

        DSA_up_ref(key);

    return ret;

}

DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey)

{

    if (pkey->type != EVP_PKEY_DSA) {

        EVPerr(EVP_F_EVP_PKEY_GET1_DSA, EVP_R_EXPECTING_A_DSA_KEY);

        return NULL;

    }

    DSA_up_ref(pkey->pkey.dsa);

    return pkey->pkey.dsa;

}

#endif

#ifndef OPENSSL_NO_EC

int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key)

{

    int ret = EVP_PKEY_assign_EC_KEY(pkey, key);

    if (ret)

        EC_KEY_up_ref(key);

    return ret;

}

EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey)

{

    if (pkey->type != EVP_PKEY_EC) {

        EVPerr(EVP_F_EVP_PKEY_GET1_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);

        return NULL;

    }

    EC_KEY_up_ref(pkey->pkey.ec);

    return pkey->pkey.ec;

}

#endif

#ifndef OPENSSL_NO_DH

int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)

{

    int ret = EVP_PKEY_assign_DH(pkey, key);

    if (ret)

        DH_up_ref(key);

    return ret;

}

DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey)

{

    if (pkey->type != EVP_PKEY_DH && pkey->type != EVP_PKEY_DHX) {

        EVPerr(EVP_F_EVP_PKEY_GET1_DH, EVP_R_EXPECTING_A_DH_KEY);

        return NULL;

    }

    DH_up_ref(pkey->pkey.dh);

    return pkey->pkey.dh;

}

#endif

int EVP_PKEY_type(int type)

{

    int ret;

    const EVP_PKEY_ASN1_METHOD *ameth;

    ENGINE *e;

    ameth = EVP_PKEY_asn1_find(&e, type);

    if (ameth)

        ret = ameth->pkey_id;

    else

        ret = NID_undef;

#ifndef OPENSSL_NO_ENGINE

    if (e)

        ENGINE_finish(e);

#endif

    return ret;

}

int EVP_PKEY_id(const EVP_PKEY *pkey)

{

    return pkey->type;

}

int EVP_PKEY_base_id(const EVP_PKEY *pkey)

{

    return EVP_PKEY_type(pkey->type);

}

void EVP_PKEY_free(EVP_PKEY *x)

{

    int i;

    if (x == NULL)

        return;

    i = CRYPTO_add(&x->references, -1, CRYPTO_LOCK_EVP_PKEY);

#ifdef REF_PRINT

    REF_PRINT("EVP_PKEY", x);

#endif

    if (i > 0)

        return;

#ifdef REF_CHECK

    if (i < 0) {

        fprintf(stderr, "EVP_PKEY_free, bad reference count\n");

        abort();

    }

#endif

    EVP_PKEY_free_it(x);

    if (x->attributes)

        sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);

    OPENSSL_free(x);

}

static void EVP_PKEY_free_it(EVP_PKEY *x)

{

    if (x->ameth && x->ameth->pkey_free) {

        x->ameth->pkey_free(x);

        x->pkey.ptr = NULL;

    }

#ifndef OPENSSL_NO_ENGINE

    if (x->engine) {

        ENGINE_finish(x->engine);

        x->engine = NULL;

    }

#endif

}

static int unsup_alg(BIO *out, const EVP_PKEY *pkey, int indent,

                     const char *kstr)

{

    BIO_indent(out, indent, 128);

    BIO_printf(out, "%s algorithm \"%s\" unsupported\n",

               kstr, OBJ_nid2ln(pkey->type));

    return 1;

}

int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,

                          int indent, ASN1_PCTX *pctx)

{

    if (pkey->ameth && pkey->ameth->pub_print)

        return pkey->ameth->pub_print(out, pkey, indent, pctx);

    return unsup_alg(out, pkey, indent, "Public Key");

}

int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,

                           int indent, ASN1_PCTX *pctx)

{

    if (pkey->ameth && pkey->ameth->priv_print)

        return pkey->ameth->priv_print(out, pkey, indent, pctx);

    return unsup_alg(out, pkey, indent, "Private Key");

}

int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,

                          int indent, ASN1_PCTX *pctx)

{

    if (pkey->ameth && pkey->ameth->param_print)

        return pkey->ameth->param_print(out, pkey, indent, pctx);

    return unsup_alg(out, pkey, indent, "Parameters");

}

int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)

{

    if (!pkey->ameth || !pkey->ameth->pkey_ctrl)

        return -2;

    return pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID,

                                  0, pnid);

}