180 lines
5.3 KiB
C
180 lines
5.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/* mpi-internal.h - Internal to the Multi Precision Integers
|
|
* Copyright (C) 1994, 1996 Free Software Foundation, Inc.
|
|
* Copyright (C) 1998, 2000 Free Software Foundation, Inc.
|
|
*
|
|
* This file is part of GnuPG.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef G10_MPI_INTERNAL_H
|
|
#define G10_MPI_INTERNAL_H
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mpi.h>
|
|
#include <linux/errno.h>
|
|
|
|
#define log_debug printk
|
|
#define log_bug printk
|
|
|
|
#define assert(x) \
|
|
do { \
|
|
if (!x) \
|
|
log_bug("failed assertion\n"); \
|
|
} while (0);
|
|
|
|
/* If KARATSUBA_THRESHOLD is not already defined, define it to a
|
|
* value which is good on most machines. */
|
|
|
|
/* tested 4, 16, 32 and 64, where 16 gave the best performance when
|
|
* checking a 768 and a 1024 bit ElGamal signature.
|
|
* (wk 22.12.97) */
|
|
#ifndef KARATSUBA_THRESHOLD
|
|
#define KARATSUBA_THRESHOLD 16
|
|
#endif
|
|
|
|
/* The code can't handle KARATSUBA_THRESHOLD smaller than 2. */
|
|
#if KARATSUBA_THRESHOLD < 2
|
|
#undef KARATSUBA_THRESHOLD
|
|
#define KARATSUBA_THRESHOLD 2
|
|
#endif
|
|
|
|
typedef mpi_limb_t *mpi_ptr_t; /* pointer to a limb */
|
|
typedef int mpi_size_t; /* (must be a signed type) */
|
|
|
|
/* Copy N limbs from S to D. */
|
|
#define MPN_COPY(d, s, n) \
|
|
do { \
|
|
mpi_size_t _i; \
|
|
for (_i = 0; _i < (n); _i++) \
|
|
(d)[_i] = (s)[_i]; \
|
|
} while (0)
|
|
|
|
#define MPN_COPY_DECR(d, s, n) \
|
|
do { \
|
|
mpi_size_t _i; \
|
|
for (_i = (n)-1; _i >= 0; _i--) \
|
|
(d)[_i] = (s)[_i]; \
|
|
} while (0)
|
|
|
|
/* Zero N limbs at D */
|
|
#define MPN_ZERO(d, n) \
|
|
do { \
|
|
int _i; \
|
|
for (_i = 0; _i < (n); _i++) \
|
|
(d)[_i] = 0; \
|
|
} while (0)
|
|
|
|
#define MPN_NORMALIZE(d, n) \
|
|
do { \
|
|
while ((n) > 0) { \
|
|
if ((d)[(n)-1]) \
|
|
break; \
|
|
(n)--; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
|
|
do { \
|
|
if ((size) < KARATSUBA_THRESHOLD) \
|
|
mul_n_basecase(prodp, up, vp, size); \
|
|
else \
|
|
mul_n(prodp, up, vp, size, tspace); \
|
|
} while (0);
|
|
|
|
/*-- mpiutil.c --*/
|
|
mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs);
|
|
void mpi_free_limb_space(mpi_ptr_t a);
|
|
void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs);
|
|
|
|
static inline mpi_limb_t mpihelp_add_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
|
|
mpi_size_t s1_size, mpi_limb_t s2_limb);
|
|
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);
|
|
static inline mpi_limb_t mpihelp_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
|
|
mpi_ptr_t s2_ptr, mpi_size_t s2_size);
|
|
|
|
static inline mpi_limb_t mpihelp_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
|
|
mpi_size_t s1_size, mpi_limb_t s2_limb);
|
|
mpi_limb_t mpihelp_sub_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
|
|
mpi_ptr_t s2_ptr, mpi_size_t size);
|
|
static inline mpi_limb_t mpihelp_sub(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
|
|
mpi_ptr_t s2_ptr, mpi_size_t s2_size);
|
|
|
|
/*-- mpih-cmp.c --*/
|
|
int mpihelp_cmp(mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size);
|
|
|
|
/*-- mpih-mul.c --*/
|
|
|
|
struct karatsuba_ctx {
|
|
struct karatsuba_ctx *next;
|
|
mpi_ptr_t tspace;
|
|
mpi_size_t tspace_size;
|
|
mpi_ptr_t tp;
|
|
mpi_size_t tp_size;
|
|
};
|
|
|
|
void mpihelp_release_karatsuba_ctx(struct karatsuba_ctx *ctx);
|
|
|
|
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 mpihelp_submul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
|
|
mpi_size_t s1_size, mpi_limb_t s2_limb);
|
|
int mpihelp_mul(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t usize,
|
|
mpi_ptr_t vp, mpi_size_t vsize, mpi_limb_t *_result);
|
|
void mpih_sqr_n_basecase(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size);
|
|
void mpih_sqr_n(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size,
|
|
mpi_ptr_t tspace);
|
|
|
|
int mpihelp_mul_karatsuba_case(mpi_ptr_t prodp,
|
|
mpi_ptr_t up, mpi_size_t usize,
|
|
mpi_ptr_t vp, mpi_size_t vsize,
|
|
struct karatsuba_ctx *ctx);
|
|
|
|
/*-- generic_mpih-mul1.c --*/
|
|
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);
|
|
|
|
/*-- mpih-div.c --*/
|
|
mpi_limb_t mpihelp_divrem(mpi_ptr_t qp, mpi_size_t qextra_limbs,
|
|
mpi_ptr_t np, mpi_size_t nsize,
|
|
mpi_ptr_t dp, mpi_size_t dsize);
|
|
|
|
/*-- generic_mpih-[lr]shift.c --*/
|
|
mpi_limb_t mpihelp_lshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
|
|
unsigned cnt);
|
|
mpi_limb_t mpihelp_rshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
|
|
unsigned cnt);
|
|
|
|
/* Define stuff for longlong.h. */
|
|
#define W_TYPE_SIZE BITS_PER_MPI_LIMB
|
|
typedef mpi_limb_t UWtype;
|
|
typedef unsigned int UHWtype;
|
|
#if defined(__GNUC__)
|
|
typedef unsigned int UQItype __attribute__ ((mode(QI)));
|
|
typedef int SItype __attribute__ ((mode(SI)));
|
|
typedef unsigned int USItype __attribute__ ((mode(SI)));
|
|
typedef int DItype __attribute__ ((mode(DI)));
|
|
typedef unsigned int UDItype __attribute__ ((mode(DI)));
|
|
#else
|
|
typedef unsigned char UQItype;
|
|
typedef long SItype;
|
|
typedef unsigned long USItype;
|
|
#endif
|
|
|
|
#ifdef __GNUC__
|
|
#include "mpi-inline.h"
|
|
#endif
|
|
|
|
#endif /*G10_MPI_INTERNAL_H */
|