security-and-privacy/gnupg
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extensions are now working and fixed a lot of bugs

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This commit is contained in:
Werner Koch 1998-06-15 15:41:04 +00:00
parent e662bf708b
commit 6e1ca6b80f
40 changed files with 350 additions and 454 deletions
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58
g10/misc.c
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@ -28,7 +28,15 @@
#endif
#include "util.h"
#include "main.h"
#include "options.h"
volatile int
pull_in_libs(void)
{
g10m_revision_string(0);
g10c_revision_string(0);
g10u_revision_string(0);
}
#if defined(__linux__) && defined(__alpha__)
@ -63,7 +71,22 @@ checksum_u16( unsigned n )
u16 a;
a = (n >> 8) & 0xff;
a |= n & 0xff;
if( opt.emulate_bugs & 1 ) {
a |= n & 0xff;
log_debug("csum_u16 emulated for n=%u\n", n);
}
else
a += n & 0xff;
return a;
}
static u16
checksum_u16_nobug( unsigned n )
{
u16 a;
a = (n >> 8) & 0xff;
a += n & 0xff;
return a;
}
@ -83,12 +106,43 @@ checksum_mpi( MPI a )
u16 csum;
byte *buffer;
unsigned nbytes;
unsigned nbits;
buffer = mpi_get_buffer( a, &nbytes, NULL );
csum = checksum_u16( mpi_get_nbits(a) );
/* some versions of gpg encode wrong values for the length of an mpi
* so that mpi_get_nbits() which counts the mpi yields another (shorter)
* value than the one store with the mpi. mpi_get_nbit_info() returns
* this stored value if it is still available.
*/
if( opt.emulate_bugs & 1 )
nbits = 0;
else
nbits = mpi_get_nbit_info(a);
if( !nbits )
nbits = mpi_get_nbits(a);
csum = checksum_u16( nbits );
csum += checksum( buffer, nbytes );
m_free( buffer );
return csum;
}
/****************
* This is the correct function
*/
u16
checksum_mpi_counted_nbits( MPI a )
{
u16 csum;
byte *buffer;
unsigned nbytes;
unsigned nbits;
buffer = mpi_get_buffer( a, &nbytes, NULL );
nbits = mpi_get_nbits(a);
csum = checksum_u16_nobug( nbits );
csum += checksum( buffer, nbytes );
m_free( buffer );
return csum;
}