1 files changed, 108 insertions, 0 deletions
diff --git a/include/linux/mpi.h b/include/linux/mpi.h
new file mode 100644
index 000000000..47be46f36
--- /dev/null
+++ b/include/linux/mpi.h
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* mpi.h  -  Multi Precision Integers
+ *	Copyright (C) 1994, 1996, 1998, 1999,
+ *                    2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GNUPG.
+ *
+ * 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.
+ *	 The GNU MP Library itself is published under the LGPL;
+ *	 however I decided to publish this code under the plain GPL.
+ */
+
+#ifndef G10_MPI_H
+#define G10_MPI_H
+
+#include <linux/types.h>
+#include <linux/scatterlist.h>
+
+#define BYTES_PER_MPI_LIMB	(BITS_PER_LONG / 8)
+#define BITS_PER_MPI_LIMB	BITS_PER_LONG
+
+typedef unsigned long int mpi_limb_t;
+typedef signed long int mpi_limb_signed_t;
+
+struct gcry_mpi {
+	int alloced;		/* array size (# of allocated limbs) */
+	int nlimbs;		/* number of valid limbs */
+	int nbits;		/* the real number of valid bits (info only) */
+	int sign;		/* indicates a negative number */
+	unsigned flags;		/* bit 0: array must be allocated in secure memory space */
+	/* bit 1: not used */
+	/* bit 2: the limb is a pointer to some m_alloced data */
+	mpi_limb_t *d;		/* array with the limbs */
+};
+
+typedef struct gcry_mpi *MPI;
+
+#define mpi_get_nlimbs(a)     ((a)->nlimbs)
+
+/*-- mpiutil.c --*/
+MPI mpi_alloc(unsigned nlimbs);
+void mpi_free(MPI a);
+int mpi_resize(MPI a, unsigned nlimbs);
+
+MPI mpi_copy(MPI a);
+
+/*-- mpicoder.c --*/
+MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes);
+MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
+MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int len);
+void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
+int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,
+		    int *sign);
+int mpi_write_to_sgl(MPI a, struct scatterlist *sg, unsigned nbytes,
+		     int *sign);
+
+/*-- mpi-mod.c --*/
+int mpi_mod(MPI rem, MPI dividend, MPI divisor);
+
+/*-- mpi-pow.c --*/
+int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
+
+/*-- mpi-cmp.c --*/
+int mpi_cmp_ui(MPI u, ulong v);
+int mpi_cmp(MPI u, MPI v);
+
+/*-- mpi-sub-ui.c --*/
+int mpi_sub_ui(MPI w, MPI u, unsigned long vval);
+
+/*-- mpi-bit.c --*/
+void mpi_normalize(MPI a);
+unsigned mpi_get_nbits(MPI a);
+int mpi_test_bit(MPI a, unsigned int n);
+int mpi_set_bit(MPI a, unsigned int n);
+int mpi_rshift(MPI x, MPI a, unsigned int n);
+
+/*-- mpi-add.c --*/
+int mpi_add(MPI w, MPI u, MPI v);
+int mpi_sub(MPI w, MPI u, MPI v);
+int mpi_addm(MPI w, MPI u, MPI v, MPI m);
+int mpi_subm(MPI w, MPI u, MPI v, MPI m);
+
+/*-- mpi-mul.c --*/
+int mpi_mul(MPI w, MPI u, MPI v);
+int mpi_mulm(MPI w, MPI u, MPI v, MPI m);
+
+/*-- mpi-div.c --*/
+int mpi_tdiv_r(MPI rem, MPI num, MPI den);
+int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);
+
+/* inline functions */
+
+/**
+ * mpi_get_size() - returns max size required to store the number
+ *
+ * @a:	A multi precision integer for which we want to allocate a buffer
+ *
+ * Return: size required to store the number
+ */
+static inline unsigned int mpi_get_size(MPI a)
+{
+	return a->nlimbs * BYTES_PER_MPI_LIMB;
+}
+#endif /*G10_MPI_H */