/* 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

static void EVP_PKEY_free_it(EVP_PKEY *x);

int EVP_PKEY_bits(EVP_PKEY *pkey)
{
    if (0)
        return 0;
#ifndef OPENSSL_NO_RSA
    else if (pkey->type == EVP_PKEY_RSA)
        return (BN_num_bits(pkey->pkey.rsa->n));
#endif
#ifndef OPENSSL_NO_DSA
    else if (pkey->type == EVP_PKEY_DSA)
        return (BN_num_bits(pkey->pkey.dsa->p));
#endif
#ifndef OPENSSL_NO_EC
    else if (pkey->type == EVP_PKEY_EC) {
        BIGNUM *order = BN_new();
        const EC_GROUP *group;
        int ret;

        if (!order) {
            ERR_clear_error();
            return 0;
        }
        group = EC_KEY_get0_group(pkey->pkey.ec);
        if (!EC_GROUP_get_order(group, order, NULL)) {
            ERR_clear_error();
            return 0;
        }

        ret = BN_num_bits(order);
        BN_free(order);
        return ret;
    }
#endif
    return (0);
}

int EVP_PKEY_size(EVP_PKEY *pkey)
{
    if (pkey == NULL)
        return (0);
#ifndef OPENSSL_NO_RSA
    if (pkey->type == EVP_PKEY_RSA)
        return (RSA_size(pkey->pkey.rsa));
    else
#endif
#ifndef OPENSSL_NO_DSA
    if (pkey->type == EVP_PKEY_DSA)
        return (DSA_size(pkey->pkey.dsa));
#endif
#ifndef OPENSSL_NO_ECDSA
    if (pkey->type == EVP_PKEY_EC)
        return (ECDSA_size(pkey->pkey.ec));
#endif

    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;
    }
#ifndef OPENSSL_NO_DSA
    if (to->type == EVP_PKEY_DSA) {
        BIGNUM *a;

        if ((a = BN_dup(from->pkey.dsa->p)) == NULL)
            goto err;
        if (to->pkey.dsa->p != NULL)
            BN_free(to->pkey.dsa->p);
        to->pkey.dsa->p = a;

        if ((a = BN_dup(from->pkey.dsa->q)) == NULL)
            goto err;
        if (to->pkey.dsa->q != NULL)
            BN_free(to->pkey.dsa->q);
        to->pkey.dsa->q = a;

        if ((a = BN_dup(from->pkey.dsa->g)) == NULL)
            goto err;
        if (to->pkey.dsa->g != NULL)
            BN_free(to->pkey.dsa->g);
        to->pkey.dsa->g = a;
    }
#endif
#ifndef OPENSSL_NO_EC
    if (to->type == EVP_PKEY_EC) {
        EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
        if (group == NULL)
            goto err;
        if (EC_KEY_set_group(to->pkey.ec, group) == 0)
            goto err;
        EC_GROUP_free(group);
    }
#endif
    return (1);
 err:
    return (0);
}

int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)
{
#ifndef OPENSSL_NO_DSA
    if (pkey->type == EVP_PKEY_DSA) {
        DSA *dsa;

        dsa = pkey->pkey.dsa;
        if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
            return (1);
    }
#endif
#ifndef OPENSSL_NO_EC
    if (pkey->type == EVP_PKEY_EC) {
        if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
            return (1);
    }
#endif

    return (0);
}

int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
{
#ifndef OPENSSL_NO_DSA
    if ((a->type == EVP_PKEY_DSA) && (b->type == EVP_PKEY_DSA)) {
        if (BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) ||
            BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) ||
            BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g))
            return (0);
        else
            return (1);
    }
#endif
#ifndef OPENSSL_NO_EC
    if (a->type == EVP_PKEY_EC && b->type == EVP_PKEY_EC) {
        const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
            *group_b = EC_KEY_get0_group(b->pkey.ec);
        if (EC_GROUP_cmp(group_a, group_b, NULL))
            return 0;
        else
            return 1;
    }
#endif
    return (-1);
}

int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
{
    if (a->type != b->type)
        return -1;

    if (EVP_PKEY_cmp_parameters(a, b) == 0)
        return 0;

    switch (a->type) {
#ifndef OPENSSL_NO_RSA
    case EVP_PKEY_RSA:
        if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0
            || BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0)
            return 0;
        break;
#endif
#ifndef OPENSSL_NO_DSA
    case EVP_PKEY_DSA:
        if (BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) != 0)
            return 0;
        break;
#endif
#ifndef OPENSSL_NO_EC
    case EVP_PKEY_EC:
        {
            int r;
            const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
            const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
                *pb = EC_KEY_get0_public_key(b->pkey.ec);
            r = EC_POINT_cmp(group, pa, pb, NULL);
            if (r != 0) {
                if (r == 1)
                    return 0;
                else
                    return -2;
            }
        }
        break;
#endif
#ifndef OPENSSL_NO_DH
    case EVP_PKEY_DH:
        return -2;
#endif
    default:
        return -2;
    }

    return 1;
}

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->references = 1;
    ret->pkey.ptr = NULL;
    ret->attributes = NULL;
    ret->save_parameters = 1;
    return (ret);
}

int EVP_PKEY_assign(EVP_PKEY *pkey, int type, char *key)
{
    if (pkey == NULL)
        return (0);
    if (pkey->pkey.ptr != NULL)
        EVP_PKEY_free_it(pkey);
    pkey->type = EVP_PKEY_type(type);
    pkey->save_type = type;
    pkey->pkey.ptr = key;
    return (key != NULL);
}

#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) {
        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)
{
    switch (type) {
    case EVP_PKEY_RSA:
    case EVP_PKEY_RSA2:
        return (EVP_PKEY_RSA);
    case EVP_PKEY_DSA:
    case EVP_PKEY_DSA1:
    case EVP_PKEY_DSA2:
    case EVP_PKEY_DSA3:
    case EVP_PKEY_DSA4:
        return (EVP_PKEY_DSA);
    case EVP_PKEY_DH:
        return (EVP_PKEY_DH);
    case EVP_PKEY_EC:
        return (EVP_PKEY_EC);
    default:
        return (NID_undef);
    }
}

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)
{
    switch (x->type) {
#ifndef OPENSSL_NO_RSA
    case EVP_PKEY_RSA:
    case EVP_PKEY_RSA2:
        RSA_free(x->pkey.rsa);
        break;
#endif
#ifndef OPENSSL_NO_DSA
    case EVP_PKEY_DSA:
    case EVP_PKEY_DSA2:
    case EVP_PKEY_DSA3:
    case EVP_PKEY_DSA4:
        DSA_free(x->pkey.dsa);
        break;
#endif
#ifndef OPENSSL_NO_EC
    case EVP_PKEY_EC:
        EC_KEY_free(x->pkey.ec);
        break;
#endif
#ifndef OPENSSL_NO_DH
    case EVP_PKEY_DH:
        DH_free(x->pkey.dh);
        break;
#endif
    }
}
