/* 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. * * 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. */ #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) */ static inline int RESIZE_IF_NEEDED(MPI a, unsigned b) { if (a->alloced < b) return mpi_resize(a, b); return 0; } /* 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_INCR(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_NORMALIZE_NOT_ZERO(d, n) \ do { \ for (;;) { \ 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); /* Divide the two-limb number in (NH,,NL) by D, with DI being the largest * limb not larger than (2**(2*BITS_PER_MP_LIMB))/D - (2**BITS_PER_MP_LIMB). * If this would yield overflow, DI should be the largest possible number * (i.e., only ones). For correct operation, the most significant bit of D * has to be set. Put the quotient in Q and the remainder in R. */ #define UDIV_QRNND_PREINV(q, r, nh, nl, d, di) \ do { \ mpi_limb_t _q, _ql, _r; \ mpi_limb_t _xh, _xl; \ umul_ppmm(_q, _ql, (nh), (di)); \ _q += (nh); /* DI is 2**BITS_PER_MPI_LIMB too small */ \ umul_ppmm(_xh, _xl, _q, (d)); \ sub_ddmmss(_xh, _r, (nh), (nl), _xh, _xl); \ if (_xh) { \ sub_ddmmss(_xh, _r, _xh, _r, 0, (d)); \ _q++; \ if (_xh) { \ sub_ddmmss(_xh, _r, _xh, _r, 0, (d)); \ _q++; \ } \ } \ if (_r >= (d)) { \ _r -= (d); \ _q++; \ } \ (r) = _r; \ (q) = _q; \ } 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); /*-- mpi-bit.c --*/ void mpi_rshift_limbs(MPI a, unsigned int count); int mpi_lshift_limbs(MPI a, unsigned int count); /*-- mpihelp-add.c --*/ 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); /*-- mpihelp-sub.c --*/ 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); /*-- mpihelp-cmp.c --*/ int mpihelp_cmp(mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size); /*-- mpihelp-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_n(mpi_ptr_t prodp, mpi_ptr_t up, mpi_ptr_t vp, mpi_size_t size); 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); /*-- mpihelp-mul_1.c (or xxx/cpu/ *.S) --*/ 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); /*-- mpihelp-div.c --*/ mpi_limb_t mpihelp_mod_1(mpi_ptr_t dividend_ptr, mpi_size_t dividend_size, mpi_limb_t divisor_limb); 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); mpi_limb_t mpihelp_divmod_1(mpi_ptr_t quot_ptr, mpi_ptr_t dividend_ptr, mpi_size_t dividend_size, mpi_limb_t divisor_limb); /*-- mpihelp-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 */