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64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/* misc.c - miscellaneous functions
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* Copyright (C) 1998 Free Software Foundation, Inc.
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*
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* This file is part of GNUPG.
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*
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* GNUPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GNUPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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#include "main.h"
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u16
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checksum_u16( unsigned n )
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{
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u16 a;
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a = (n >> 8) & 0xff;
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a |= n & 0xff;
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return a;
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}
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u16
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checksum( byte *p, unsigned n )
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{
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u16 a;
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for(a=0; n; n-- )
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a += *p++;
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return a;
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}
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u16
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checksum_mpi( MPI a )
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{
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u16 csum;
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byte *buffer;
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unsigned nbytes;
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buffer = mpi_get_buffer( a, &nbytes, NULL );
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csum = checksum_u16( mpi_get_nbits(a) );
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csum += checksum( buffer, nbytes );
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m_free( buffer );
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return csum;
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}
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