/*

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

 * 2010.

 */

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

 * Copyright (c) 2010 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.

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

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/x509.h>

#include <openssl/x509v3.h>

#include <openssl/evp.h>

#include <openssl/cmac.h>

#include "evp_locl.h"

/* The context structure and "key" is simply a CMAC_CTX */

static int pkey_cmac_init(EVP_PKEY_CTX *ctx)

{

    ctx->data = CMAC_CTX_new();

    if (!ctx->data)

        return 0;

    ctx->keygen_info_count = 0;

    return 1;

}

static int pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)

{

    if (!pkey_cmac_init(dst))

        return 0;

    if (!CMAC_CTX_copy(dst->data, src->data))

        return 0;

    return 1;

}

static void pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)

{

    CMAC_CTX_free(ctx->data);

}

static int pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)

{

    CMAC_CTX *cmkey = CMAC_CTX_new();

    CMAC_CTX *cmctx = ctx->data;

    if (!cmkey)

        return 0;

    if (!CMAC_CTX_copy(cmkey, cmctx)) {

        CMAC_CTX_free(cmkey);

        return 0;

    }

    EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey);

    return 1;

}

static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)

{

    if (!CMAC_Update(ctx->pctx->data, data, count))

        return 0;

    return 1;

}

static int cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)

{

    EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);

    mctx->update = int_update;

    return 1;

}

static int cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,

                        EVP_MD_CTX *mctx)

{

    return CMAC_Final(ctx->data, sig, siglen);

}

static int pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)

{

    CMAC_CTX *cmctx = ctx->data;

    switch (type) {

    case EVP_PKEY_CTRL_SET_MAC_KEY:

        if (!p2 || p1 < 0)

            return 0;

        if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))

            return 0;

        break;

    case EVP_PKEY_CTRL_CIPHER:

        if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))

            return 0;

        break;

    case EVP_PKEY_CTRL_MD:

        if (ctx->pkey && !CMAC_CTX_copy(ctx->data,

                                        (CMAC_CTX *)ctx->pkey->pkey.ptr))

            return 0;

        if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))

            return 0;

        break;

    default:

        return -2;

    }

    return 1;

}

static int pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx,

                              const char *type, const char *value)

{

    if (!value) {

        return 0;

    }

    if (!strcmp(type, "key")) {

        void *p = (void *)value;

        return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, strlen(p), p);

    }

    if (!strcmp(type, "cipher")) {

        const EVP_CIPHER *c;

        c = EVP_get_cipherbyname(value);

        if (!c)

            return 0;

        return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);

    }

    if (!strcmp(type, "hexkey")) {

        unsigned char *key;

        int r;

        long keylen;

        key = string_to_hex(value, &keylen);

        if (!key)

            return 0;

        r = pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);

        OPENSSL_free(key);

        return r;

    }

    return -2;

}

const EVP_PKEY_METHOD cmac_pkey_meth = {

    EVP_PKEY_CMAC,

    EVP_PKEY_FLAG_SIGCTX_CUSTOM,

    pkey_cmac_init,

    pkey_cmac_copy,

    pkey_cmac_cleanup,

    0, 0,

    0,

    pkey_cmac_keygen,

    0, 0,

    0, 0,

    0, 0,

    cmac_signctx_init,

    cmac_signctx,

    0, 0,

    0, 0,

    0, 0,

    0, 0,

    pkey_cmac_ctrl,

    pkey_cmac_ctrl_str

};