/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2010 Brian Raderman <brian@irregularexpression.org>
 *  Copyright (C) 2013-2015 Vasily Kulikov <segoon@openwall.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  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 for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program (see the file COPYING included with this
 *  distribution); if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include <CommonCrypto/CommonDigest.h>
#include <Security/SecKey.h>
#include <Security/Security.h>

#include "crypto_osx.h"
#include <err.h>

void printErrorMsg(const char *func, CFErrorRef error)
{
  CFStringRef desc = CFErrorCopyDescription(error);
  warnx("%s failed: %s", func, CFStringGetCStringPtr(desc, kCFStringEncodingUTF8));
  CFRelease(desc);
}

void printErrorStatusMsg(const char *func, OSStatus status)
{
  CFStringRef error;
  error = SecCopyErrorMessageString(status, NULL);
  if (error)
    {
      warnx("%s failed: %s", func, CFStringGetCStringPtr(error, kCFStringEncodingUTF8));
      CFRelease(error);
    }
  else
    warnx("%s failed: %X", func, (int)status);
}

void signData(SecIdentityRef identity, const uint8_t *from, int flen, uint8_t *to, size_t *tlen)
{
  SecKeyRef privateKey = NULL;
  OSStatus status;

  status = SecIdentityCopyPrivateKey(identity,  &privateKey);
  if (status != noErr)
    {
      printErrorStatusMsg("signData: SecIdentityCopyPrivateKey", status);
      *tlen = 0;
      return;
    }

  status = SecKeyRawSign(privateKey, kSecPaddingPKCS1, from, flen, to, tlen);
  CFRelease(privateKey);
  if (status != noErr)
    {
      printErrorStatusMsg("signData: SecKeyRawSign", status);
      *tlen = 0;
      return;
    }
}