    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * 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.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS 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 COPYRIGHT OWNER
     *   OR 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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   pskey.c - print prescaler key
     *
     *
     *   Contributor(s):
     *	Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *   system header files;
     *--------------------------------------------------------------------*/

    #include <stdio.h>
    #include <string.h>
    #include <unistd.h>
    #include <errno.h>
    #include <sys/stat.h>

    /*====================================================================*
     *   custom header files;
     *--------------------------------------------------------------------*/

    #include "../tools/getoptv.h"
    #include "../tools/number.h"
    #include "../tools/types.h"
    #include "../tools/error.h"
    #include "../tools/files.h"
    #include "../tools/flags.h"
    #include "../key/HPAVKey.h"
    #include "../key/SHA256.h"
    #include "../pib/pib.h"

    /*====================================================================*
     *   custom source files;
     *--------------------------------------------------------------------*/

    #ifndef MAKEFILE
    #include "../tools/getoptv.c"
    #include "../tools/putoptv.c"
    #include "../tools/version.c"
    #include "../tools/fdchecksum32.c"
    #include "../tools/hexdecode.c"
    #include "../tools/hexstring.c"
    #include "../tools/hexout.c"
    #include "../tools/error.c"
    #endif

    #ifndef MAKEFILE
    #include "../pib/pibfile1.c"
    #endif

    #ifndef MAKEFILE
    #include "../key/SHA256Reset.c"
    #include "../key/SHA256Write.c"
    #include "../key/SHA256Block.c"
    #include "../key/SHA256Fetch.c"
    #include "../key/keys.c"
    #endif

    /*====================================================================*
     *   program constants;
     *--------------------------------------------------------------------*/

    #define PSKEY_VERBOSE (1 << 0)
    #define PSKEY_SILENCE (1 << 1)

    /*====================================================================*
     *
     *   static signed pskey (struct _file_ * pib);
     *
     *   compute the SHA256 digest of the PIB file prescalers and print
     *   the key with optional filename on stdout; the digest acts like
     *   a fingerprint;
     *
     *   assume that offset and extent are for ar7400 and change to 6400
     *   offset and extent when the PIB requires it;
     *
     *
     *--------------------------------------------------------------------*/

    static signed pskey (struct _file_ * pib, off_t offset, void * memory, ssize_t extent, flag_t flags)

    {
    	struct sha256 sha256;
    	byte digest [SHA256_DIGEST_LENGTH];
    	struct pib_header pib_header;
    	if (read (pib->file, &pib_header, sizeof (pib_header)) != sizeof (pib_header))
    	{
    		return (-1);
    	}
    	if (pib_header.FWVERSION < 0x05)
    	{
    		offset = INT_PRESCALER_OFFSET;
    		extent = INT_PRESCALER_LENGTH;
    	}
    	if (lseek (pib->file, offset, SEEK_SET) != offset)
    	{
    		error (0, errno, FILE_CANTSEEK, pib->name);
    		return (-1);
    	}
    	if (read (pib->file, memory, extent) != extent)
    	{
    		error (0, errno, FILE_CANTREAD, pib->name);
    		return (-1);
    	}
    	SHA256Reset (&sha256);
    	SHA256Write (&sha256, memory, extent);
    	SHA256Fetch (&sha256, digest);
    	hexout (digest, sizeof (digest), '\0', 0, stdout);
    	if (_allclr (flags, PSKEY_SILENCE))
    	{
    		printf (" %s", pib->name);
    	}
    	printf ("\n");
    	return (0);
    }

    /*====================================================================*
     *
     *   int main (int argc, char const * argv [])
     *
     *
     *--------------------------------------------------------------------*/

    int main (int argc, char const * argv [])

    {
    	static char const * optv [] =
    	{
    		"lqrsv",
    		"file [file] [...]",
    		"print prescaler finger-print on stdout",
    		"q\tquiet mode",
    		"v\tverbose mode",
    		(char const *) (0)
    	};
    	struct _file_ pib;
    	uint8_t buffer [INT_PRESCALER_LENGTH];
    	signed state = 0;
    	flag_t flags = (flag_t) (0);
    	signed c;
    	optind = 1;
    	while ((c = getoptv (argc, argv, optv)) != -1)
    	{
    		switch ((char) (c))
    		{
    		case 'q':
    			_setbits (flags, PSKEY_SILENCE);
    			break;
    		case 'v':
    			_setbits (flags, PSKEY_VERBOSE);
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;
    	while ((argc) && (* argv))
    	{
    		pib.name = * argv;
    		if ((pib.file = open (pib.name, O_BINARY|O_RDONLY)) == -1)
    		{
    			error (0, errno, "Can't open: %s", pib.name);
    			state = 1;
    			errno = 0;
    		}
    		else if (pibfile1 (&pib))
    		{
    			error (0, errno, "Bad PIB: %s", pib.name);
    			state = 1;
    		}
    		else if (pskey (&pib, INT_PRESCALER_OFFSET, buffer, sizeof (buffer), flags))
    		{
    			state = 1;
    		}
    		close (pib.file);
    		argc--;
    		argv++;
    	}
    	return (state);
    }

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