/* Copyright (c) 2012, 2021, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   Without limiting anything contained in the foregoing, this file,
   which is part of C Driver for MySQL (Connector/C), is also subject to the
   Universal FOSS Exception, version 1.0, a copy of which can be found at
   http://oss.oracle.com/licenses/universal-foss-exception.

   This program 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 General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */


/**
  @file

  @brief
  Wrapper functions for OpenSSL implementations.
*/

#include <my_global.h>
#include <sha1.h>

#if defined(HAVE_OPENSSL)
#include <openssl/sha.h>

int mysql_sha1_reset(SHA_CTX *context)
{
    return SHA1_Init(context);
}


int mysql_sha1_input(SHA_CTX *context, const uint8 *message_array,
                     unsigned length)
{
    return SHA1_Update(context, message_array, length);
}


int mysql_sha1_result(SHA_CTX *context,
                      uint8 Message_Digest[SHA1_HASH_SIZE])
{
    return SHA1_Final(Message_Digest, context);
}

#endif /* HAVE_OPENSSL */

/**
  Wrapper function to compute SHA1 message digest.

  @param digest [out]  Computed SHA1 digest
  @param buf    [in]   Message to be computed
  @param len    [in]   Length of the message

  @return              void
*/
void compute_sha1_hash(uint8 *digest, const char *buf, size_t len)
{
#if defined(HAVE_OPENSSL)
  SHA_CTX sha1_context;

  mysql_sha1_reset(&sha1_context);
  mysql_sha1_input(&sha1_context, (const uint8 *) buf, len);
  mysql_sha1_result(&sha1_context, digest);
#endif /* HAVE_OPENSSL */
}


/**
  Wrapper function to compute SHA1 message digest for
  two messages in order to emulate sha1(msg1, msg2).

  @param digest [out]  Computed SHA1 digest
  @param buf1   [in]   First message
  @param len1   [in]   Length of first message
  @param buf2   [in]   Second message
  @param len2   [in]   Length of second message

  @return              void
*/
void compute_sha1_hash_multi(uint8 *digest, const char *buf1, int len1,
                             const char *buf2, int len2)
{
#if defined(HAVE_OPENSSL)
  SHA_CTX sha1_context;

  mysql_sha1_reset(&sha1_context);
  mysql_sha1_input(&sha1_context, (const uint8 *) buf1, len1);
  mysql_sha1_input(&sha1_context, (const uint8 *) buf2, len2);
  mysql_sha1_result(&sha1_context, digest);
#endif /* HAVE_OPENSSL */
}

