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1 : : /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 : : /* mpi.h - Multi Precision Integers 3 : : * Copyright (C) 1994, 1996, 1998, 1999, 4 : : * 2000, 2001 Free Software Foundation, Inc. 5 : : * 6 : : * This file is part of GNUPG. 7 : : * 8 : : * Note: This code is heavily based on the GNU MP Library. 9 : : * Actually it's the same code with only minor changes in the 10 : : * way the data is stored; this is to support the abstraction 11 : : * of an optional secure memory allocation which may be used 12 : : * to avoid revealing of sensitive data due to paging etc. 13 : : * The GNU MP Library itself is published under the LGPL; 14 : : * however I decided to publish this code under the plain GPL. 15 : : */ 16 : : 17 : : #ifndef G10_MPI_H 18 : : #define G10_MPI_H 19 : : 20 : : #include <linux/types.h> 21 : : #include <linux/scatterlist.h> 22 : : 23 : : #define BYTES_PER_MPI_LIMB (BITS_PER_LONG / 8) 24 : : #define BITS_PER_MPI_LIMB BITS_PER_LONG 25 : : 26 : : typedef unsigned long int mpi_limb_t; 27 : : typedef signed long int mpi_limb_signed_t; 28 : : 29 : : struct gcry_mpi { 30 : : int alloced; /* array size (# of allocated limbs) */ 31 : : int nlimbs; /* number of valid limbs */ 32 : : int nbits; /* the real number of valid bits (info only) */ 33 : : int sign; /* indicates a negative number */ 34 : : unsigned flags; /* bit 0: array must be allocated in secure memory space */ 35 : : /* bit 1: not used */ 36 : : /* bit 2: the limb is a pointer to some m_alloced data */ 37 : : mpi_limb_t *d; /* array with the limbs */ 38 : : }; 39 : : 40 : : typedef struct gcry_mpi *MPI; 41 : : 42 : : #define mpi_get_nlimbs(a) ((a)->nlimbs) 43 : : 44 : : /*-- mpiutil.c --*/ 45 : : MPI mpi_alloc(unsigned nlimbs); 46 : : void mpi_free(MPI a); 47 : : int mpi_resize(MPI a, unsigned nlimbs); 48 : : 49 : : /*-- mpicoder.c --*/ 50 : : MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes); 51 : : MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread); 52 : : MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int len); 53 : : void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign); 54 : : int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes, 55 : : int *sign); 56 : : int mpi_write_to_sgl(MPI a, struct scatterlist *sg, unsigned nbytes, 57 : : int *sign); 58 : : 59 : : /*-- mpi-pow.c --*/ 60 : : int mpi_powm(MPI res, MPI base, MPI exp, MPI mod); 61 : : 62 : : /*-- mpi-cmp.c --*/ 63 : : int mpi_cmp_ui(MPI u, ulong v); 64 : : int mpi_cmp(MPI u, MPI v); 65 : : 66 : : /*-- mpi-bit.c --*/ 67 : : void mpi_normalize(MPI a); 68 : : unsigned mpi_get_nbits(MPI a); 69 : : 70 : : /* inline functions */ 71 : : 72 : : /** 73 : : * mpi_get_size() - returns max size required to store the number 74 : : * 75 : : * @a: A multi precision integer for which we want to allocate a bufer 76 : : * 77 : : * Return: size required to store the number 78 : : */ 79 : 39 : static inline unsigned int mpi_get_size(MPI a) 80 : : { 81 [ + - - + : 26 : return a->nlimbs * BYTES_PER_MPI_LIMB; - - ] 82 : : } 83 : : #endif /*G10_MPI_H */