Commit e1045992 authored by David Howells's avatar David Howells Committed by Rusty Russell
Browse files

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



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: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 42d5ec27

include/linux/mpi.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

lib/mpi/mpicoder.c

+55 −0
Original line number Diff line number Diff line
@@ -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;

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