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-rw-r--r--grub-core/lib/libgcrypt/mpi/mpiutil.c460
1 files changed, 460 insertions, 0 deletions
diff --git a/grub-core/lib/libgcrypt/mpi/mpiutil.c b/grub-core/lib/libgcrypt/mpi/mpiutil.c
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+++ b/grub-core/lib/libgcrypt/mpi/mpiutil.c
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+/* 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"
+#include "mod-source-info.h"
+
+
+const char *
+_gcry_mpi_get_hw_config (void)
+{
+ return mod_source_info + 1;
+}
+
+
+/****************
+ * 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_randomize( gcry_mpi_t w,
+ unsigned int nbits, enum gcry_random_level level )
+{
+ unsigned char *p;
+ size_t nbytes = (nbits+7)/8;
+
+ if (level == GCRY_WEAK_RANDOM)
+ {
+ p = mpi_is_secure(w) ? gcry_xmalloc_secure (nbytes)
+ : gcry_xmalloc (nbytes);
+ gcry_create_nonce (p, nbytes);
+ }
+ else
+ {
+ p = mpi_is_secure(w) ? gcry_random_bytes_secure (nbytes, level)
+ : gcry_random_bytes (nbytes, level);
+ }
+ _gcry_mpi_set_buffer( w, p, nbytes, 0 );
+ gcry_free (p);
+}
+
+
+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;
+}
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