1 files changed, 123 insertions, 0 deletions

diff --git a/lib/mpi/mpiutil.c b/lib/mpi/mpiutil.c
new file mode 100644
index 000000000000..657979f71bef
--- /dev/null
+++ b/lib/mpi/mpiutil.c
@@ -0,0 +1,123 @@
+/* mpiutil.ac  -  Utility functions for MPI
+ * Copyright (C) 1998, 1999 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
+ */
+
+#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 chnage this to bits (or bytes).
+ *
+ *        But mpi_alloc is used in a lot of places :-)
+ */
+MPI mpi_alloc(unsigned nlimbs)
+{
+        MPI a;
+
+        a = kmalloc(sizeof *a, GFP_KERNEL);
+        if (!a)
+                return a;
+
+        if (nlimbs) {
+                a->d = mpi_alloc_limb_space(nlimbs);
+                if (!a->d) {
+                        kfree(a);
+                        return NULL;
+                }
+        } else {
+                a->d = NULL;
+        }
+
+        a->alloced = nlimbs;
+        a->nlimbs = 0;
+        a->sign = 0;
+        a->flags = 0;
+        a->nbits = 0;
+        return a;
+}
+EXPORT_SYMBOL_GPL(mpi_alloc);
+
+mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
+{
+        size_t len = nlimbs * sizeof(mpi_limb_t);
+
+        if (!len)
+                return NULL;
+
+        return kmalloc(len, GFP_KERNEL);
+}
+
+void mpi_free_limb_space(mpi_ptr_t a)
+{
+        if (!a)
+                return;
+
+        kfree(a);
+}
+
+void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs)
+{
+        mpi_free_limb_space(a->d);
+        a->d = ap;
+        a->alloced = nlimbs;
+}
+
+/****************
+ * Resize the array of A to NLIMBS. the additional space is cleared
+ * (set to 0) [done by m_realloc()]
+ */
+int mpi_resize(MPI a, unsigned nlimbs)
+{
+        void *p;
+
+        if (nlimbs <= a->alloced)
+                return 0;       /* no need to do it */
+
+        if (a->d) {
+                p = kmalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
+                if (!p)
+                        return -ENOMEM;
+                memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t));
+                kfree(a->d);
+                a->d = p;
+        } else {
+                a->d = kzalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
+                if (!a->d)
+                        return -ENOMEM;
+        }
+        a->alloced = nlimbs;
+        return 0;
+}
+
+void mpi_free(MPI a)
+{
+        if (!a)
+                return;
+
+        if (a->flags & 4)
+                kfree(a->d);
+        else
+                mpi_free_limb_space(a->d);
+
+        if (a->flags & ~7)
+                pr_info("invalid flag value in mpi\n");
+        kfree(a);
+}
+EXPORT_SYMBOL_GPL(mpi_free);