/* ghmac.h - data hashing functions

 *

 * Copyright (C) 2011  Collabora Ltd.

 * Copyright (C) 2019  Red Hat, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include "config.h"

#include <string.h>

#include "ghmac.h"

#include "glib/galloca.h"

#include "gatomic.h"

#include "gslice.h"

#include "gmem.h"

#include "gstrfuncs.h"

#include "gtestutils.h"

#include "gtypes.h"

#include "glibintl.h"

/**

 * g_compute_hmac_for_data:

 * @digest_type: a #GChecksumType to use for the HMAC

 * @key: (array length=key_len): the key to use in the HMAC

 * @key_len: the length of the key

 * @data: (array length=length): binary blob to compute the HMAC of

 * @length: length of @data

 *

 * Computes the HMAC for a binary @data of @length. This is a

 * convenience wrapper for g_hmac_new(), g_hmac_get_string()

 * and g_hmac_unref().

 *

 * The hexadecimal string returned will be in lower case.

 *

 * Returns: the HMAC of the binary data as a string in hexadecimal.

 *   The returned string should be freed with g_free() when done using it.

 *

 * Since: 2.30

 */

gchar *

g_compute_hmac_for_data (GChecksumType  digest_type,

                         const guchar  *key,

                         gsize          key_len,

                         const guchar  *data,

                         gsize          length)

{

  GHmac *hmac;

  gchar *retval;

  g_return_val_if_fail (length == 0 || data != NULL, NULL);

  hmac = g_hmac_new (digest_type, key, key_len);

  if (!hmac)

    return NULL;

  g_hmac_update (hmac, data, length);

  retval = g_strdup (g_hmac_get_string (hmac));

  g_hmac_unref (hmac);

  return retval;

}

/**

 * g_compute_hmac_for_bytes:

 * @digest_type: a #GChecksumType to use for the HMAC

 * @key: the key to use in the HMAC

 * @data: binary blob to compute the HMAC of

 *

 * Computes the HMAC for a binary @data. This is a

 * convenience wrapper for g_hmac_new(), g_hmac_get_string()

 * and g_hmac_unref().

 *

 * The hexadecimal string returned will be in lower case.

 *

 * Returns: the HMAC of the binary data as a string in hexadecimal.

 *   The returned string should be freed with g_free() when done using it.

 *

 * Since: 2.50

 */

gchar *

g_compute_hmac_for_bytes (GChecksumType  digest_type,

                          GBytes        *key,

                          GBytes        *data)

{

  gconstpointer byte_data;

  gsize length;

  gconstpointer key_data;

  gsize key_len;

  g_return_val_if_fail (data != NULL, NULL);

  g_return_val_if_fail (key != NULL, NULL);

  byte_data = g_bytes_get_data (data, &length);

  key_data = g_bytes_get_data (key, &key_len);

  return g_compute_hmac_for_data (digest_type, key_data, key_len, byte_data, length);

}

/**

 * g_compute_hmac_for_string:

 * @digest_type: a #GChecksumType to use for the HMAC

 * @key: (array length=key_len): the key to use in the HMAC

 * @key_len: the length of the key

 * @str: the string to compute the HMAC for

 * @length: the length of the string, or -1 if the string is nul-terminated

 *

 * Computes the HMAC for a string.

 *

 * The hexadecimal string returned will be in lower case.

 *

 * Returns: the HMAC as a hexadecimal string.

 *     The returned string should be freed with g_free()

 *     when done using it.

 *

 * Since: 2.30

 */

gchar *

g_compute_hmac_for_string (GChecksumType  digest_type,

                           const guchar  *key,

                           gsize          key_len,

                           const gchar   *str,

                           gssize         length)

{

  g_return_val_if_fail (length == 0 || str != NULL, NULL);

  if (length < 0)

    length = strlen (str);

  return g_compute_hmac_for_data (digest_type, key, key_len,

                                  (const guchar *) str, length);

}