summaryrefslogtreecommitdiffabout
path: root/pwmanager/libcrypt/mpi/generic/mpih-mul1.c
Side-by-side diff
Diffstat (limited to 'pwmanager/libcrypt/mpi/generic/mpih-mul1.c') (more/less context) (ignore whitespace changes)
-rw-r--r--pwmanager/libcrypt/mpi/generic/mpih-mul1.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/pwmanager/libcrypt/mpi/generic/mpih-mul1.c b/pwmanager/libcrypt/mpi/generic/mpih-mul1.c
new file mode 100644
index 0000000..0e8197d
--- a/dev/null
+++ b/pwmanager/libcrypt/mpi/generic/mpih-mul1.c
@@ -0,0 +1,62 @@
+/* mpihelp-mul_1.c - MPI helper functions
+ * Copyright (C) 1994, 1996, 1997, 1998, 2001,
+ * 2002 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "mpi-internal.h"
+#include "longlong.h"
+
+mpi_limb_t
+_gcry_mpih_mul_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
+ mpi_limb_t s2_limb)
+{
+ mpi_limb_t cy_limb;
+ mpi_size_t j;
+ mpi_limb_t prod_high, prod_low;
+
+ /* The loop counter and index J goes from -S1_SIZE to -1. This way
+ * the loop becomes faster. */
+ j = -s1_size;
+
+ /* Offset the base pointers to compensate for the negative indices. */
+ s1_ptr -= j;
+ res_ptr -= j;
+
+ cy_limb = 0;
+ do
+ {
+ umul_ppmm( prod_high, prod_low, s1_ptr[j], s2_limb );
+ prod_low += cy_limb;
+ cy_limb = (prod_low < cy_limb?1:0) + prod_high;
+ res_ptr[j] = prod_low;
+ }
+ while( ++j );
+
+ return cy_limb;
+}
+