/* pmeth_gn.c */

/*

 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project

 * 2006.

 */

/* ====================================================================

 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.

 *

 * 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 above 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 acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED 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 OpenSSL PROJECT OR

 * ITS 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.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#include <stdio.h>

#include <stdlib.h>

#include "cryptlib.h"

#include <openssl/objects.h>

#include <openssl/evp.h>

#include <openssl/bn.h>

#include "evp_locl.h"

int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen) {

        EVPerr(EVP_F_EVP_PKEY_PARAMGEN_INIT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    ctx->operation = EVP_PKEY_OP_PARAMGEN;

    if (!ctx->pmeth->paramgen_init)

        return 1;

    ret = ctx->pmeth->paramgen_init(ctx);

    if (ret <= 0)

        ctx->operation = EVP_PKEY_OP_UNDEFINED;

    return ret;

}

int EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen) {

        EVPerr(EVP_F_EVP_PKEY_PARAMGEN,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    if (ctx->operation != EVP_PKEY_OP_PARAMGEN) {

        EVPerr(EVP_F_EVP_PKEY_PARAMGEN, EVP_R_OPERATON_NOT_INITIALIZED);

        return -1;

    }

    if (ppkey == NULL)

        return -1;

    if (*ppkey == NULL)

        *ppkey = EVP_PKEY_new();

    if (*ppkey == NULL) {

        EVPerr(EVP_F_EVP_PKEY_PARAMGEN, ERR_R_MALLOC_FAILURE);

        return -1;

    }

    ret = ctx->pmeth->paramgen(ctx, *ppkey);

    if (ret <= 0) {

        EVP_PKEY_free(*ppkey);

        *ppkey = NULL;

    }

    return ret;

}

int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen) {

        EVPerr(EVP_F_EVP_PKEY_KEYGEN_INIT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    ctx->operation = EVP_PKEY_OP_KEYGEN;

    if (!ctx->pmeth->keygen_init)

        return 1;

    ret = ctx->pmeth->keygen_init(ctx);

    if (ret <= 0)

        ctx->operation = EVP_PKEY_OP_UNDEFINED;

    return ret;

}

int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen) {

        EVPerr(EVP_F_EVP_PKEY_KEYGEN,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    if (ctx->operation != EVP_PKEY_OP_KEYGEN) {

        EVPerr(EVP_F_EVP_PKEY_KEYGEN, EVP_R_OPERATON_NOT_INITIALIZED);

        return -1;

    }

    if (!ppkey)

        return -1;

    if (*ppkey == NULL)

        *ppkey = EVP_PKEY_new();

    if (*ppkey == NULL)

        return -1;

    ret = ctx->pmeth->keygen(ctx, *ppkey);

    if (ret <= 0) {

        EVP_PKEY_free(*ppkey);

        *ppkey = NULL;

    }

    return ret;

}

void EVP_PKEY_CTX_set_cb(EVP_PKEY_CTX *ctx, EVP_PKEY_gen_cb *cb)

{

    ctx->pkey_gencb = cb;

}

EVP_PKEY_gen_cb *EVP_PKEY_CTX_get_cb(EVP_PKEY_CTX *ctx)

{

    return ctx->pkey_gencb;

}

/*

 * "translation callback" to call EVP_PKEY_CTX callbacks using BN_GENCB style

 * callbacks.

 */

static int trans_cb(int a, int b, BN_GENCB *gcb)

{

    EVP_PKEY_CTX *ctx = gcb->arg;

    ctx->keygen_info[0] = a;

    ctx->keygen_info[1] = b;

    return ctx->pkey_gencb(ctx);

}

void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx)

{

    BN_GENCB_set(cb, trans_cb, ctx)

}

int EVP_PKEY_CTX_get_keygen_info(EVP_PKEY_CTX *ctx, int idx)

{

    if (idx == -1)

        return ctx->keygen_info_count;

    if (idx < 0 || idx > ctx->keygen_info_count)

        return 0;

    return ctx->keygen_info[idx];

}

EVP_PKEY *EVP_PKEY_new_mac_key(int type, ENGINE *e,

                               const unsigned char *key, int keylen)

{

    EVP_PKEY_CTX *mac_ctx = NULL;

    EVP_PKEY *mac_key = NULL;

    mac_ctx = EVP_PKEY_CTX_new_id(type, e);

    if (!mac_ctx)

        return NULL;

    if (EVP_PKEY_keygen_init(mac_ctx) <= 0)

        goto merr;

    if (EVP_PKEY_CTX_ctrl(mac_ctx, -1, EVP_PKEY_OP_KEYGEN,

                          EVP_PKEY_CTRL_SET_MAC_KEY,

                          keylen, (void *)key) <= 0)

        goto merr;

    if (EVP_PKEY_keygen(mac_ctx, &mac_key) <= 0)

        goto merr;

 merr:

    if (mac_ctx)

        EVP_PKEY_CTX_free(mac_ctx);

    return mac_key;

}