/*

 * Copyright 2010-2016 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 "internal/cryptlib.h"

#include <openssl/x509.h>

#include <openssl/x509v3.h>

#include <openssl/evp.h>

#include <openssl/cmac.h>

#include "internal/evp_int.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 == NULL)

        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 == NULL)

        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(EVP_MD_CTX_pkey_ctx(ctx)->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);

    EVP_MD_CTX_set_update_fn(mctx, 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, "cipher") == 0) {

        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, "key") == 0)

        return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);

    if (strcmp(type, "hexkey") == 0)

        return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);

    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

};