233 lines
6.9 KiB
C
233 lines
6.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* mpi-internal.h - Internal to the Multi Precision Integers
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* Copyright (C) 1994, 1996 Free Software Foundation, Inc.
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* Copyright (C) 1998, 2000 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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* The GNU MP Library itself is published under the LGPL;
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* however I decided to publish this code under the plain GPL.
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*/
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#ifndef G10_MPI_INTERNAL_H
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#define G10_MPI_INTERNAL_H
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/mpi.h>
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#include <linux/errno.h>
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#define log_debug printk
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#define log_bug printk
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#define assert(x) \
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do { \
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if (!x) \
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log_bug("failed assertion\n"); \
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} while (0);
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/* If KARATSUBA_THRESHOLD is not already defined, define it to a
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* value which is good on most machines. */
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/* tested 4, 16, 32 and 64, where 16 gave the best performance when
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* checking a 768 and a 1024 bit ElGamal signature.
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* (wk 22.12.97) */
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#ifndef KARATSUBA_THRESHOLD
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#define KARATSUBA_THRESHOLD 16
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#endif
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/* The code can't handle KARATSUBA_THRESHOLD smaller than 2. */
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#if KARATSUBA_THRESHOLD < 2
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#undef KARATSUBA_THRESHOLD
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#define KARATSUBA_THRESHOLD 2
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#endif
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typedef mpi_limb_t *mpi_ptr_t; /* pointer to a limb */
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typedef int mpi_size_t; /* (must be a signed type) */
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#define RESIZE_IF_NEEDED(a, b) \
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do { \
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if ((a)->alloced < (b)) \
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mpi_resize((a), (b)); \
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} while (0)
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/* Copy N limbs from S to D. */
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#define MPN_COPY(d, s, n) \
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do { \
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mpi_size_t _i; \
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for (_i = 0; _i < (n); _i++) \
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(d)[_i] = (s)[_i]; \
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} while (0)
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#define MPN_COPY_INCR(d, s, n) \
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do { \
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mpi_size_t _i; \
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for (_i = 0; _i < (n); _i++) \
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(d)[_i] = (s)[_i]; \
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} while (0)
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#define MPN_COPY_DECR(d, s, n) \
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do { \
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mpi_size_t _i; \
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for (_i = (n)-1; _i >= 0; _i--) \
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(d)[_i] = (s)[_i]; \
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} while (0)
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/* Zero N limbs at D */
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#define MPN_ZERO(d, n) \
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do { \
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int _i; \
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for (_i = 0; _i < (n); _i++) \
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(d)[_i] = 0; \
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} while (0)
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#define MPN_NORMALIZE(d, n) \
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do { \
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while ((n) > 0) { \
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if ((d)[(n)-1]) \
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break; \
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(n)--; \
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} \
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} while (0)
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#define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
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do { \
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if ((size) < KARATSUBA_THRESHOLD) \
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mul_n_basecase(prodp, up, vp, size); \
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else \
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mul_n(prodp, up, vp, size, tspace); \
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} while (0);
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/* Divide the two-limb number in (NH,,NL) by D, with DI being the largest
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* limb not larger than (2**(2*BITS_PER_MP_LIMB))/D - (2**BITS_PER_MP_LIMB).
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* If this would yield overflow, DI should be the largest possible number
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* (i.e., only ones). For correct operation, the most significant bit of D
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* has to be set. Put the quotient in Q and the remainder in R.
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*/
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#define UDIV_QRNND_PREINV(q, r, nh, nl, d, di) \
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do { \
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mpi_limb_t _ql __maybe_unused; \
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mpi_limb_t _q, _r; \
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mpi_limb_t _xh, _xl; \
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umul_ppmm(_q, _ql, (nh), (di)); \
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_q += (nh); /* DI is 2**BITS_PER_MPI_LIMB too small */ \
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umul_ppmm(_xh, _xl, _q, (d)); \
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sub_ddmmss(_xh, _r, (nh), (nl), _xh, _xl); \
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if (_xh) { \
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sub_ddmmss(_xh, _r, _xh, _r, 0, (d)); \
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_q++; \
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if (_xh) { \
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sub_ddmmss(_xh, _r, _xh, _r, 0, (d)); \
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_q++; \
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} \
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} \
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if (_r >= (d)) { \
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_r -= (d); \
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_q++; \
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} \
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(r) = _r; \
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(q) = _q; \
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} while (0)
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/*-- mpiutil.c --*/
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mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs);
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void mpi_free_limb_space(mpi_ptr_t a);
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void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs);
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static inline mpi_limb_t mpihelp_add_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
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mpi_size_t s1_size, mpi_limb_t s2_limb);
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mpi_limb_t mpihelp_add_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
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mpi_ptr_t s2_ptr, mpi_size_t size);
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static inline mpi_limb_t mpihelp_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
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mpi_ptr_t s2_ptr, mpi_size_t s2_size);
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static inline mpi_limb_t mpihelp_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
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mpi_size_t s1_size, mpi_limb_t s2_limb);
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mpi_limb_t mpihelp_sub_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
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mpi_ptr_t s2_ptr, mpi_size_t size);
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static inline mpi_limb_t mpihelp_sub(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
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mpi_ptr_t s2_ptr, mpi_size_t s2_size);
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/*-- mpih-cmp.c --*/
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int mpihelp_cmp(mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size);
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/*-- mpih-mul.c --*/
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struct karatsuba_ctx {
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struct karatsuba_ctx *next;
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mpi_ptr_t tspace;
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mpi_size_t tspace_size;
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mpi_ptr_t tp;
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mpi_size_t tp_size;
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};
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void mpihelp_release_karatsuba_ctx(struct karatsuba_ctx *ctx);
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mpi_limb_t mpihelp_addmul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
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mpi_size_t s1_size, mpi_limb_t s2_limb);
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mpi_limb_t mpihelp_submul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
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mpi_size_t s1_size, mpi_limb_t s2_limb);
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int mpihelp_mul(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t usize,
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mpi_ptr_t vp, mpi_size_t vsize, mpi_limb_t *_result);
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void mpih_sqr_n_basecase(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size);
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void mpih_sqr_n(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size,
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mpi_ptr_t tspace);
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void mpihelp_mul_n(mpi_ptr_t prodp,
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mpi_ptr_t up, mpi_ptr_t vp, mpi_size_t size);
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int mpihelp_mul_karatsuba_case(mpi_ptr_t prodp,
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mpi_ptr_t up, mpi_size_t usize,
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mpi_ptr_t vp, mpi_size_t vsize,
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struct karatsuba_ctx *ctx);
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/*-- generic_mpih-mul1.c --*/
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mpi_limb_t mpihelp_mul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
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mpi_size_t s1_size, mpi_limb_t s2_limb);
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/*-- mpih-div.c --*/
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mpi_limb_t mpihelp_mod_1(mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
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mpi_limb_t divisor_limb);
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mpi_limb_t mpihelp_divrem(mpi_ptr_t qp, mpi_size_t qextra_limbs,
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mpi_ptr_t np, mpi_size_t nsize,
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mpi_ptr_t dp, mpi_size_t dsize);
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mpi_limb_t mpihelp_divmod_1(mpi_ptr_t quot_ptr,
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mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
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mpi_limb_t divisor_limb);
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/*-- generic_mpih-[lr]shift.c --*/
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mpi_limb_t mpihelp_lshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
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unsigned cnt);
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mpi_limb_t mpihelp_rshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
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unsigned cnt);
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/* Define stuff for longlong.h. */
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#define W_TYPE_SIZE BITS_PER_MPI_LIMB
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typedef mpi_limb_t UWtype;
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typedef unsigned int UHWtype;
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#if defined(__GNUC__)
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typedef unsigned int UQItype __attribute__ ((mode(QI)));
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typedef int SItype __attribute__ ((mode(SI)));
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typedef unsigned int USItype __attribute__ ((mode(SI)));
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typedef int DItype __attribute__ ((mode(DI)));
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typedef unsigned int UDItype __attribute__ ((mode(DI)));
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#else
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typedef unsigned char UQItype;
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typedef long SItype;
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typedef unsigned long USItype;
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#endif
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#ifdef __GNUC__
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#include "mpi-inline.h"
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#endif
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#endif /*G10_MPI_INTERNAL_H */
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