/*

 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <stdlib.h>

#include "internal/cryptlib.h"

#include <openssl/objects.h>

#include <openssl/evp.h>

#include "crypto/bn.h"

#include "crypto/asn1.h"

#include "crypto/evp.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 == NULL)

        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 = BN_GENCB_get_arg(gcb);

    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_set_mac_key(mac_ctx, key, keylen) <= 0)

        goto merr;

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

        goto merr;

 merr:

    EVP_PKEY_CTX_free(mac_ctx);

    return mac_key;

}

int EVP_PKEY_check(EVP_PKEY_CTX *ctx)

{

    EVP_PKEY *pkey = ctx->pkey;

    if (pkey == NULL) {

        EVPerr(EVP_F_EVP_PKEY_CHECK, EVP_R_NO_KEY_SET);

        return 0;

    }

    /* call customized check function first */

    if (ctx->pmeth->check != NULL)

        return ctx->pmeth->check(pkey);

    /* use default check function in ameth */

    if (pkey->ameth == NULL || pkey->ameth->pkey_check == NULL) {

        EVPerr(EVP_F_EVP_PKEY_CHECK,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

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

}

int EVP_PKEY_public_check(EVP_PKEY_CTX *ctx)

{

    EVP_PKEY *pkey = ctx->pkey;

    if (pkey == NULL) {

        EVPerr(EVP_F_EVP_PKEY_PUBLIC_CHECK, EVP_R_NO_KEY_SET);

        return 0;

    }

    /* call customized public key check function first */

    if (ctx->pmeth->public_check != NULL)

        return ctx->pmeth->public_check(pkey);

    /* use default public key check function in ameth */

    if (pkey->ameth == NULL || pkey->ameth->pkey_public_check == NULL) {

        EVPerr(EVP_F_EVP_PKEY_PUBLIC_CHECK,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

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

}

int EVP_PKEY_param_check(EVP_PKEY_CTX *ctx)

{

    EVP_PKEY *pkey = ctx->pkey;

    if (pkey == NULL) {

        EVPerr(EVP_F_EVP_PKEY_PARAM_CHECK, EVP_R_NO_KEY_SET);

        return 0;

    }

    /* call customized param check function first */

    if (ctx->pmeth->param_check != NULL)

        return ctx->pmeth->param_check(pkey);

    /* use default param check function in ameth */

    if (pkey->ameth == NULL || pkey->ameth->pkey_param_check == NULL) {

        EVPerr(EVP_F_EVP_PKEY_PARAM_CHECK,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

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

}