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Commit cdec9cb5 authored by Dmitry Kasatkin's avatar Dmitry Kasatkin
Browse files

crypto: GnuPG based MPI lib - source files (part 1) 



Adds the multi-precision-integer maths library which was originally taken
from GnuPG and ported to the kernel by (among others) David Howells.
This version is taken from Fedora kernel 2.6.32-71.14.1.el6.
The difference is that checkpatch reported errors and warnings have been fixed.

This library is used to implemenet RSA digital signature verification
used in IMA/EVM integrity protection subsystem.

Due to patch size limitation, the patch is divided into 4 parts.

Signed-off-by: default avatarDmitry Kasatkin <dmitry.kasatkin@intel.com>
parent 1ea6b8f4

lib/mpi/generic_mpih-add1.c

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Original line number Diff line number Diff line 
/* mpihelp-add_1.c  -  MPI helper functions

 * Copyright (C) 1994, 1996, 1997, 1998,

 *               2000 Free Software Foundation, Inc.

 *

 * This file is part of GnuPG.

 *

 * GnuPG is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * GnuPG is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *

 * Note: This code is heavily based on the GNU MP Library.

 *	 Actually it's the same code with only minor changes in the

 *	 way the data is stored; this is to support the abstraction

 *	 of an optional secure memory allocation which may be used

 *	 to avoid revealing of sensitive data due to paging etc.

 *	 The GNU MP Library itself is published under the LGPL;

 *	 however I decided to publish this code under the plain GPL.

 */



#include "mpi-internal.h"

#include "longlong.h"



mpi_limb_t

mpihelp_add_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,

	      mpi_ptr_t s2_ptr, mpi_size_t size)

{

	mpi_limb_t x, y, cy;

	mpi_size_t j;



	/* The loop counter and index J goes from -SIZE to -1.  This way

	   the loop becomes faster.  */

	j = -size;



	/* Offset the base pointers to compensate for the negative indices. */

	s1_ptr -= j;

	s2_ptr -= j;

	res_ptr -= j;



	cy = 0;

	do {

		y = s2_ptr[j];

		x = s1_ptr[j];

		y += cy;	/* add previous carry to one addend */

		cy = y < cy;	/* get out carry from that addition */

		y += x;		/* add other addend */

		cy += y < x;	/* get out carry from that add, combine */

		res_ptr[j] = y;

	} while (++j);



	return cy;

}

lib/mpi/generic_mpih-lshift.c

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Original line number Diff line number Diff line 
/* mpihelp-lshift.c  -	MPI helper functions

 * Copyright (C) 1994, 1996, 1998, 2001 Free Software Foundation, Inc.

 *

 * This file is part of GnuPG.

 *

 * GnuPG is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * GnuPG is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *

 * Note: This code is heavily based on the GNU MP Library.

 *	 Actually it's the same code with only minor changes in the

 *	 way the data is stored; this is to support the abstraction

 *	 of an optional secure memory allocation which may be used

 *	 to avoid revealing of sensitive data due to paging etc.

 *	 The GNU MP Library itself is published under the LGPL;

 *	 however I decided to publish this code under the plain GPL.

 */



#include "mpi-internal.h"



/* Shift U (pointed to by UP and USIZE digits long) CNT bits to the left

 * and store the USIZE least significant digits of the result at WP.

 * Return the bits shifted out from the most significant digit.

 *

 * Argument constraints:

 * 1. 0 < CNT < BITS_PER_MP_LIMB

 * 2. If the result is to be written over the input, WP must be >= UP.

 */



mpi_limb_t

mpihelp_lshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize, unsigned int cnt)

{

	mpi_limb_t high_limb, low_limb;

	unsigned sh_1, sh_2;

	mpi_size_t i;

	mpi_limb_t retval;



	sh_1 = cnt;

	wp += 1;

	sh_2 = BITS_PER_MPI_LIMB - sh_1;

	i = usize - 1;

	low_limb = up[i];

	retval = low_limb >> sh_2;

	high_limb = low_limb;

	while (--i >= 0) {

		low_limb = up[i];

		wp[i] = (high_limb << sh_1) | (low_limb >> sh_2);

		high_limb = low_limb;

	}

	wp[i] = high_limb << sh_1;



	return retval;

}

lib/mpi/generic_mpih-mul1.c

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Original line number Diff line number Diff line 
/* mpihelp-mul_1.c  -  MPI helper functions

 * Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc.

 *

 * This file is part of GnuPG.

 *

 * GnuPG is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * GnuPG is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *

 * Note: This code is heavily based on the GNU MP Library.

 *	 Actually it's the same code with only minor changes in the

 *	 way the data is stored; this is to support the abstraction

 *	 of an optional secure memory allocation which may be used

 *	 to avoid revealing of sensitive data due to paging etc.

 *	 The GNU MP Library itself is published under the LGPL;

 *	 however I decided to publish this code under the plain GPL.

 */



#include "mpi-internal.h"

#include "longlong.h"



mpi_limb_t

mpihelp_mul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,

	      mpi_limb_t s2_limb)

{

	mpi_limb_t cy_limb;

	mpi_size_t j;

	mpi_limb_t prod_high, prod_low;



	/* The loop counter and index J goes from -S1_SIZE to -1.  This way

	 * the loop becomes faster.  */

	j = -s1_size;



	/* Offset the base pointers to compensate for the negative indices.  */

	s1_ptr -= j;

	res_ptr -= j;



	cy_limb = 0;

	do {

		umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);

		prod_low += cy_limb;

		cy_limb = (prod_low < cy_limb ? 1 : 0) + prod_high;

		res_ptr[j] = prod_low;

	} while (++j);



	return cy_limb;

}

lib/mpi/generic_mpih-mul2.c

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Original line number Diff line number Diff line 
/* mpihelp-mul_2.c  -  MPI helper functions

 * Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc.

 *

 * This file is part of GnuPG.

 *

 * GnuPG is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * GnuPG is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *

 * Note: This code is heavily based on the GNU MP Library.

 *	 Actually it's the same code with only minor changes in the

 *	 way the data is stored; this is to support the abstraction

 *	 of an optional secure memory allocation which may be used

 *	 to avoid revealing of sensitive data due to paging etc.

 *	 The GNU MP Library itself is published under the LGPL;

 *	 however I decided to publish this code under the plain GPL.

 */



#include "mpi-internal.h"

#include "longlong.h"



mpi_limb_t

mpihelp_addmul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,

		 mpi_size_t s1_size, mpi_limb_t s2_limb)

{

	mpi_limb_t cy_limb;

	mpi_size_t j;

	mpi_limb_t prod_high, prod_low;

	mpi_limb_t x;



	/* The loop counter and index J goes from -SIZE to -1.  This way

	 * the loop becomes faster.  */

	j = -s1_size;

	res_ptr -= j;

	s1_ptr -= j;



	cy_limb = 0;

	do {

		umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);



		prod_low += cy_limb;

		cy_limb = (prod_low < cy_limb ? 1 : 0) + prod_high;



		x = res_ptr[j];

		prod_low = x + prod_low;

		cy_limb += prod_low < x ? 1 : 0;

		res_ptr[j] = prod_low;

	} while (++j);

	return cy_limb;

}

lib/mpi/generic_mpih-mul3.c

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Original line number Diff line number Diff line 
/* mpihelp-mul_3.c  -  MPI helper functions

 * Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc.

 *

 * This file is part of GnuPG.

 *

 * GnuPG is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * GnuPG is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *

 * Note: This code is heavily based on the GNU MP Library.

 *	 Actually it's the same code with only minor changes in the

 *	 way the data is stored; this is to support the abstraction

 *	 of an optional secure memory allocation which may be used

 *	 to avoid revealing of sensitive data due to paging etc.

 *	 The GNU MP Library itself is published under the LGPL;

 *	 however I decided to publish this code under the plain GPL.

 */



#include "mpi-internal.h"

#include "longlong.h"



mpi_limb_t

mpihelp_submul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,

		 mpi_size_t s1_size, mpi_limb_t s2_limb)

{

	mpi_limb_t cy_limb;

	mpi_size_t j;

	mpi_limb_t prod_high, prod_low;

	mpi_limb_t x;



	/* The loop counter and index J goes from -SIZE to -1.  This way

	 * the loop becomes faster.  */

	j = -s1_size;

	res_ptr -= j;

	s1_ptr -= j;



	cy_limb = 0;

	do {

		umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);



		prod_low += cy_limb;

		cy_limb = (prod_low < cy_limb ? 1 : 0) + prod_high;



		x = res_ptr[j];

		prod_low = x - prod_low;

		cy_limb += prod_low > x ? 1 : 0;

		res_ptr[j] = prod_low;

	} while (++j);



	return cy_limb;

}