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MPILIB: Provide a function to read raw data into an MPI

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Provide a function to read raw data of a predetermined size into an MPI rather
than expecting the size to be encoded within the data.  The data is assumed to
represent an unsigned integer, and the resulting MPI will be positive.

The function looks like this:

	MPI mpi_read_raw_data(const void *, size_t);

This is useful for reading ASN.1 integer primitives where the length is encoded
in the ASN.1 metadata.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
David Howells 2012-09-24 17:11:27 +01:00 committed by Rusty Russell
parent 42d5ec27f8
commit e104599294
2 changed files with 56 additions and 0 deletions
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1
include/linux/mpi.h
View file

@ -76,6 +76,7 @@ void mpi_swap(MPI a, MPI b);
/*-- mpicoder.c --*/
MPI do_encode_md(const void *sha_buffer, unsigned nbits);
MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes);
MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
int mpi_fromstr(MPI val, const char *str);
u32 mpi_get_keyid(MPI a, u32 *keyid);

55
lib/mpi/mpicoder.c
View file

@ -18,10 +18,65 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <linux/bitops.h>
#include <asm-generic/bitops/count_zeros.h>
#include "mpi-internal.h"
#define MAX_EXTERN_MPI_BITS 16384
/**
* mpi_read_raw_data - Read a raw byte stream as a positive integer
* @xbuffer: The data to read
* @nbytes: The amount of data to read
*/
MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes)
{
const uint8_t *buffer = xbuffer;
int i, j;
unsigned nbits, nlimbs;
mpi_limb_t a;
MPI val = NULL;
while (nbytes >= 0 && buffer[0] == 0) {
buffer++;
nbytes--;
}
nbits = nbytes * 8;
if (nbits > MAX_EXTERN_MPI_BITS) {
pr_info("MPI: mpi too large (%u bits)\n", nbits);
return NULL;
}
if (nbytes > 0)
nbits -= count_leading_zeros(buffer[0]);
else
nbits = 0;
nlimbs = (nbytes + BYTES_PER_MPI_LIMB - 1) / BYTES_PER_MPI_LIMB;
val = mpi_alloc(nlimbs);
if (!val)
return NULL;
val->nbits = nbits;
val->sign = 0;
val->nlimbs = nlimbs;
if (nbytes > 0) {
i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
i %= BYTES_PER_MPI_LIMB;
for (j = nlimbs; j > 0; j--) {
a = 0;
for (; i < BYTES_PER_MPI_LIMB; i++) {
a <<= 8;
a |= *buffer++;
}
i = 0;
val->d[j - 1] = a;
}
}
return val;
}
EXPORT_SYMBOL_GPL(mpi_read_raw_data);
MPI mpi_read_from_buffer(const void *xbuffer, unsigned *ret_nread)
{
const uint8_t *buffer = xbuffer;