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8e3a67f2de
The remaining functions added by commita8ea8bdd9ddid not check for memory allocation errors. Add the checks and change the API to allow errors to be returned. Fixes:a8ea8bdd9d("lib/mpi: Extend the MPI library") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* mpi.h - Multi Precision Integers
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* Copyright (C) 1994, 1996, 1998, 1999,
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* 2000, 2001 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_H
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#define G10_MPI_H
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#include <linux/types.h>
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#include <linux/scatterlist.h>
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#define BYTES_PER_MPI_LIMB (BITS_PER_LONG / 8)
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#define BITS_PER_MPI_LIMB BITS_PER_LONG
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typedef unsigned long int mpi_limb_t;
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typedef signed long int mpi_limb_signed_t;
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struct gcry_mpi {
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int alloced; /* array size (# of allocated limbs) */
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int nlimbs; /* number of valid limbs */
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int nbits; /* the real number of valid bits (info only) */
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int sign; /* indicates a negative number */
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unsigned flags; /* bit 0: array must be allocated in secure memory space */
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/* bit 1: not used */
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/* bit 2: the limb is a pointer to some m_alloced data */
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mpi_limb_t *d; /* array with the limbs */
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};
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typedef struct gcry_mpi *MPI;
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#define mpi_get_nlimbs(a) ((a)->nlimbs)
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/*-- mpiutil.c --*/
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MPI mpi_alloc(unsigned nlimbs);
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void mpi_free(MPI a);
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int mpi_resize(MPI a, unsigned nlimbs);
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MPI mpi_copy(MPI a);
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/*-- mpicoder.c --*/
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MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes);
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MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
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MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int len);
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void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
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int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,
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int *sign);
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int mpi_write_to_sgl(MPI a, struct scatterlist *sg, unsigned nbytes,
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int *sign);
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/*-- mpi-mod.c --*/
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int mpi_mod(MPI rem, MPI dividend, MPI divisor);
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/*-- mpi-pow.c --*/
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int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
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/*-- mpi-cmp.c --*/
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int mpi_cmp_ui(MPI u, ulong v);
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int mpi_cmp(MPI u, MPI v);
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/*-- mpi-sub-ui.c --*/
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int mpi_sub_ui(MPI w, MPI u, unsigned long vval);
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/*-- mpi-bit.c --*/
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void mpi_normalize(MPI a);
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unsigned mpi_get_nbits(MPI a);
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int mpi_test_bit(MPI a, unsigned int n);
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int mpi_set_bit(MPI a, unsigned int n);
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int mpi_rshift(MPI x, MPI a, unsigned int n);
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/*-- mpi-add.c --*/
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int mpi_add(MPI w, MPI u, MPI v);
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int mpi_sub(MPI w, MPI u, MPI v);
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int mpi_addm(MPI w, MPI u, MPI v, MPI m);
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int mpi_subm(MPI w, MPI u, MPI v, MPI m);
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/*-- mpi-mul.c --*/
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int mpi_mul(MPI w, MPI u, MPI v);
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int mpi_mulm(MPI w, MPI u, MPI v, MPI m);
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/*-- mpi-div.c --*/
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int mpi_tdiv_r(MPI rem, MPI num, MPI den);
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int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);
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/* inline functions */
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/**
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* mpi_get_size() - returns max size required to store the number
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*
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* @a: A multi precision integer for which we want to allocate a buffer
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*
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* Return: size required to store the number
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*/
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static inline unsigned int mpi_get_size(MPI a)
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{
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return a->nlimbs * BYTES_PER_MPI_LIMB;
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}
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#endif /*G10_MPI_H */
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