diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
commit | 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch) | |
tree | 32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /grub-core/lib/libgcrypt-grub/mpi/mpiutil.c | |
parent | Initial commit. (diff) | |
download | grub2-upstream/2.06.tar.xz grub2-upstream/2.06.zip |
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | grub-core/lib/libgcrypt-grub/mpi/mpiutil.c | 435 |
1 files changed, 435 insertions, 0 deletions
diff --git a/grub-core/lib/libgcrypt-grub/mpi/mpiutil.c b/grub-core/lib/libgcrypt-grub/mpi/mpiutil.c new file mode 100644 index 0000000..3fec8db --- /dev/null +++ b/grub-core/lib/libgcrypt-grub/mpi/mpiutil.c @@ -0,0 +1,435 @@ +/* This file was automatically imported with + import_gcry.py. Please don't modify it */ +/* mpiutil.ac - Utility functions for MPI + * Copyright (C) 1998, 2000, 2001, 2002, 2003, + * 2007 Free Software Foundation, Inc. + * + * This file is part of Libgcrypt. + * + * Libgcrypt is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as + * published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * Libgcrypt 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 Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "g10lib.h" +#include "mpi-internal.h" + + + + +/**************** + * Note: It was a bad idea to use the number of limbs to allocate + * because on a alpha the limbs are large but we normally need + * integers of n bits - So we should change this to bits (or bytes). + * + * But mpi_alloc is used in a lot of places :-(. New code + * should use mpi_new. + */ +gcry_mpi_t +_gcry_mpi_alloc( unsigned nlimbs ) +{ + gcry_mpi_t a; + + a = gcry_xmalloc( sizeof *a ); + a->d = nlimbs? mpi_alloc_limb_space( nlimbs, 0 ) : NULL; + a->alloced = nlimbs; + a->nlimbs = 0; + a->sign = 0; + a->flags = 0; + return a; +} + +void +_gcry_mpi_m_check( gcry_mpi_t a ) +{ + _gcry_check_heap(a); + _gcry_check_heap(a->d); +} + +gcry_mpi_t +_gcry_mpi_alloc_secure( unsigned nlimbs ) +{ + gcry_mpi_t a; + + a = gcry_xmalloc( sizeof *a ); + a->d = nlimbs? mpi_alloc_limb_space( nlimbs, 1 ) : NULL; + a->alloced = nlimbs; + a->flags = 1; + a->nlimbs = 0; + a->sign = 0; + return a; +} + + + +mpi_ptr_t +_gcry_mpi_alloc_limb_space( unsigned int nlimbs, int secure ) +{ + mpi_ptr_t p; + size_t len; + + len = (nlimbs ? nlimbs : 1) * sizeof (mpi_limb_t); + p = secure ? gcry_xmalloc_secure (len) : gcry_xmalloc (len); + if (! nlimbs) + *p = 0; + + return p; +} + +void +_gcry_mpi_free_limb_space( mpi_ptr_t a, unsigned int nlimbs) +{ + if (a) + { + size_t len = nlimbs * sizeof(mpi_limb_t); + + /* If we have information on the number of allocated limbs, we + better wipe that space out. This is a failsafe feature if + secure memory has been disabled or was not properly + implemented in user provided allocation functions. */ + if (len) + wipememory (a, len); + gcry_free(a); + } +} + + +void +_gcry_mpi_assign_limb_space( gcry_mpi_t a, mpi_ptr_t ap, unsigned int nlimbs ) +{ + _gcry_mpi_free_limb_space (a->d, a->alloced); + a->d = ap; + a->alloced = nlimbs; +} + + + +/**************** + * Resize the array of A to NLIMBS. The additional space is cleared + * (set to 0). + */ +void +_gcry_mpi_resize (gcry_mpi_t a, unsigned nlimbs) +{ + size_t i; + + if (nlimbs <= a->alloced) + { + /* We only need to clear the new space (this is a nop if the + limb space is already of the correct size. */ + for (i=a->nlimbs; i < a->alloced; i++) + a->d[i] = 0; + return; + } + + /* Actually resize the limb space. */ + if (a->d) + { + a->d = gcry_xrealloc (a->d, nlimbs * sizeof (mpi_limb_t)); + for (i=a->alloced; i < nlimbs; i++) + a->d[i] = 0; + } + else + { + if (a->flags & 1) + /* Secure memory is wanted. */ + a->d = gcry_xcalloc_secure (nlimbs , sizeof (mpi_limb_t)); + else + /* Standard memory. */ + a->d = gcry_xcalloc (nlimbs , sizeof (mpi_limb_t)); + } + a->alloced = nlimbs; +} + +void +_gcry_mpi_clear( gcry_mpi_t a ) +{ + a->nlimbs = 0; + a->flags = 0; +} + + +void +_gcry_mpi_free( gcry_mpi_t a ) +{ + if (!a ) + return; + if ((a->flags & 4)) + gcry_free( a->d ); + else + { + _gcry_mpi_free_limb_space(a->d, a->alloced); + } + if ((a->flags & ~7)) + log_bug("invalid flag value in mpi\n"); + gcry_free(a); +} + +static void +mpi_set_secure( gcry_mpi_t a ) +{ + mpi_ptr_t ap, bp; + + if ( (a->flags & 1) ) + return; + a->flags |= 1; + ap = a->d; + if (!a->nlimbs) + { + gcry_assert (!ap); + return; + } + bp = mpi_alloc_limb_space (a->nlimbs, 1); + MPN_COPY( bp, ap, a->nlimbs ); + a->d = bp; + _gcry_mpi_free_limb_space (ap, a->alloced); +} + + +gcry_mpi_t +gcry_mpi_set_opaque( gcry_mpi_t a, void *p, unsigned int nbits ) +{ + if (!a) + a = mpi_alloc(0); + + if( a->flags & 4 ) + gcry_free( a->d ); + else + _gcry_mpi_free_limb_space (a->d, a->alloced); + + a->d = p; + a->alloced = 0; + a->nlimbs = 0; + a->sign = nbits; + a->flags = 4; + return a; +} + + +void * +gcry_mpi_get_opaque( gcry_mpi_t a, unsigned int *nbits ) +{ + if( !(a->flags & 4) ) + log_bug("mpi_get_opaque on normal mpi\n"); + if( nbits ) + *nbits = a->sign; + return a->d; +} + + +/**************** + * Note: This copy function should not interpret the MPI + * but copy it transparently. + */ +gcry_mpi_t +gcry_mpi_copy( gcry_mpi_t a ) +{ + int i; + gcry_mpi_t b; + + if( a && (a->flags & 4) ) { + void *p = gcry_is_secure(a->d)? gcry_xmalloc_secure( (a->sign+7)/8 ) + : gcry_xmalloc( (a->sign+7)/8 ); + memcpy( p, a->d, (a->sign+7)/8 ); + b = gcry_mpi_set_opaque( NULL, p, a->sign ); + } + else if( a ) { + b = mpi_is_secure(a)? mpi_alloc_secure( a->nlimbs ) + : mpi_alloc( a->nlimbs ); + b->nlimbs = a->nlimbs; + b->sign = a->sign; + b->flags = a->flags; + for(i=0; i < b->nlimbs; i++ ) + b->d[i] = a->d[i]; + } + else + b = NULL; + return b; +} + + +/**************** + * This function allocates an MPI which is optimized to hold + * a value as large as the one given in the argument and allocates it + * with the same flags as A. + */ +gcry_mpi_t +_gcry_mpi_alloc_like( gcry_mpi_t a ) +{ + gcry_mpi_t b; + + if( a && (a->flags & 4) ) { + int n = (a->sign+7)/8; + void *p = gcry_is_secure(a->d)? gcry_malloc_secure( n ) + : gcry_malloc( n ); + memcpy( p, a->d, n ); + b = gcry_mpi_set_opaque( NULL, p, a->sign ); + } + else if( a ) { + b = mpi_is_secure(a)? mpi_alloc_secure( a->nlimbs ) + : mpi_alloc( a->nlimbs ); + b->nlimbs = 0; + b->sign = 0; + b->flags = a->flags; + } + else + b = NULL; + return b; +} + + +gcry_mpi_t +gcry_mpi_set( gcry_mpi_t w, gcry_mpi_t u) +{ + mpi_ptr_t wp, up; + mpi_size_t usize = u->nlimbs; + int usign = u->sign; + + if (!w) + w = _gcry_mpi_alloc( mpi_get_nlimbs(u) ); + RESIZE_IF_NEEDED(w, usize); + wp = w->d; + up = u->d; + MPN_COPY( wp, up, usize ); + w->nlimbs = usize; + w->flags = u->flags; + w->sign = usign; + return w; +} + + +gcry_mpi_t +gcry_mpi_set_ui( gcry_mpi_t w, unsigned long u) +{ + if (!w) + w = _gcry_mpi_alloc (1); + /* FIXME: If U is 0 we have no need to resize and thus possible + allocating the the limbs. */ + RESIZE_IF_NEEDED(w, 1); + w->d[0] = u; + w->nlimbs = u? 1:0; + w->sign = 0; + w->flags = 0; + return w; +} + +gcry_err_code_t +_gcry_mpi_get_ui (gcry_mpi_t w, unsigned long *u) +{ + gcry_err_code_t err = GPG_ERR_NO_ERROR; + unsigned long x = 0; + + if (w->nlimbs > 1) + err = GPG_ERR_TOO_LARGE; + else if (w->nlimbs == 1) + x = w->d[0]; + else + x = 0; + + if (! err) + *u = x; + + return err; +} + +gcry_error_t +gcry_mpi_get_ui (gcry_mpi_t w, unsigned long *u) +{ + gcry_err_code_t err = GPG_ERR_NO_ERROR; + + err = _gcry_mpi_get_ui (w, u); + + return gcry_error (err); +} + +gcry_mpi_t +_gcry_mpi_alloc_set_ui( unsigned long u) +{ + gcry_mpi_t w = mpi_alloc(1); + w->d[0] = u; + w->nlimbs = u? 1:0; + w->sign = 0; + return w; +} + +void +gcry_mpi_swap( gcry_mpi_t a, gcry_mpi_t b) +{ + struct gcry_mpi tmp; + + tmp = *a; *a = *b; *b = tmp; +} + + +gcry_mpi_t +gcry_mpi_new( unsigned int nbits ) +{ + return _gcry_mpi_alloc ( (nbits+BITS_PER_MPI_LIMB-1) + / BITS_PER_MPI_LIMB ); +} + + +gcry_mpi_t +gcry_mpi_snew( unsigned int nbits ) +{ + return _gcry_mpi_alloc_secure ( (nbits+BITS_PER_MPI_LIMB-1) + / BITS_PER_MPI_LIMB ); +} + +void +gcry_mpi_release( gcry_mpi_t a ) +{ + _gcry_mpi_free( a ); +} + + + +void +gcry_mpi_set_flag( gcry_mpi_t a, enum gcry_mpi_flag flag ) +{ + switch( flag ) { + case GCRYMPI_FLAG_SECURE: mpi_set_secure(a); break; + case GCRYMPI_FLAG_OPAQUE: + default: log_bug("invalid flag value\n"); + } +} + +void +gcry_mpi_clear_flag( gcry_mpi_t a, enum gcry_mpi_flag flag ) +{ + (void)a; /* Not yet used. */ + + switch (flag) + { + case GCRYMPI_FLAG_SECURE: + case GCRYMPI_FLAG_OPAQUE: + default: log_bug("invalid flag value\n"); + } +} + +int +gcry_mpi_get_flag( gcry_mpi_t a, enum gcry_mpi_flag flag ) +{ + switch (flag) + { + case GCRYMPI_FLAG_SECURE: return (a->flags & 1); + case GCRYMPI_FLAG_OPAQUE: return (a->flags & 4); + default: log_bug("invalid flag value\n"); + } + /*NOTREACHED*/ + return 0; +} |