Revert "lib/mpi: Extend the MPI library"

This partially reverts commit a8ea8bdd9df92a0e5db5b43900abb7a288b8a53e.

Most of it is no longer needed since sm2 has been removed.  However,
the following functions have been kept as they have developed other
uses:

mpi_copy

mpi_mod

mpi_test_bit
mpi_set_bit
mpi_rshift

mpi_add
mpi_sub
mpi_addm
mpi_subm

mpi_mul
mpi_mulm

mpi_tdiv_r
mpi_fdiv_r

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 0 insertions, 143 deletions

diff --git a/lib/crypto/mpi/mpi-inv.c b/lib/crypto/mpi/mpi-inv.c
deleted file mode 100644
index 61e37d18f793..000000000000
--- a/lib/crypto/mpi/mpi-inv.c
+++ /dev/null
@@ -1,143 +0,0 @@
-/* mpi-inv.c  -  MPI functions
- *	Copyright (C) 1998, 2001, 2002, 2003 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 "mpi-internal.h"
-
-/****************
- * Calculate the multiplicative inverse X of A mod N
- * That is: Find the solution x for
- *		1 = (a*x) mod n
- */
-int mpi_invm(MPI x, MPI a, MPI n)
-{
-	/* Extended Euclid's algorithm (See TAOCP Vol II, 4.5.2, Alg X)
-	 * modified according to Michael Penk's solution for Exercise 35
-	 * with further enhancement
-	 */
-	MPI u, v, u1, u2 = NULL, u3, v1, v2 = NULL, v3, t1, t2 = NULL, t3;
-	unsigned int k;
-	int sign;
-	int odd;
-
-	if (!mpi_cmp_ui(a, 0))
-		return 0; /* Inverse does not exists.  */
-	if (!mpi_cmp_ui(n, 1))
-		return 0; /* Inverse does not exists.  */
-
-	u = mpi_copy(a);
-	v = mpi_copy(n);
-
-	for (k = 0; !mpi_test_bit(u, 0) && !mpi_test_bit(v, 0); k++) {
-		mpi_rshift(u, u, 1);
-		mpi_rshift(v, v, 1);
-	}
-	odd = mpi_test_bit(v, 0);
-
-	u1 = mpi_alloc_set_ui(1);
-	if (!odd)
-		u2 = mpi_alloc_set_ui(0);
-	u3 = mpi_copy(u);
-	v1 = mpi_copy(v);
-	if (!odd) {
-		v2 = mpi_alloc(mpi_get_nlimbs(u));
-		mpi_sub(v2, u1, u); /* U is used as const 1 */
-	}
-	v3 = mpi_copy(v);
-	if (mpi_test_bit(u, 0)) { /* u is odd */
-		t1 = mpi_alloc_set_ui(0);
-		if (!odd) {
-			t2 = mpi_alloc_set_ui(1);
-			t2->sign = 1;
-		}
-		t3 = mpi_copy(v);
-		t3->sign = !t3->sign;
-		goto Y4;
-	} else {
-		t1 = mpi_alloc_set_ui(1);
-		if (!odd)
-			t2 = mpi_alloc_set_ui(0);
-		t3 = mpi_copy(u);
-	}
-
-	do {
-		do {
-			if (!odd) {
-				if (mpi_test_bit(t1, 0) || mpi_test_bit(t2, 0)) {
-					/* one is odd */
-					mpi_add(t1, t1, v);
-					mpi_sub(t2, t2, u);
-				}
-				mpi_rshift(t1, t1, 1);
-				mpi_rshift(t2, t2, 1);
-				mpi_rshift(t3, t3, 1);
-			} else {
-				if (mpi_test_bit(t1, 0))
-					mpi_add(t1, t1, v);
-				mpi_rshift(t1, t1, 1);
-				mpi_rshift(t3, t3, 1);
-			}
-Y4:
-			;
-		} while (!mpi_test_bit(t3, 0)); /* while t3 is even */
-
-		if (!t3->sign) {
-			mpi_set(u1, t1);
-			if (!odd)
-				mpi_set(u2, t2);
-			mpi_set(u3, t3);
-		} else {
-			mpi_sub(v1, v, t1);
-			sign = u->sign; u->sign = !u->sign;
-			if (!odd)
-				mpi_sub(v2, u, t2);
-			u->sign = sign;
-			sign = t3->sign; t3->sign = !t3->sign;
-			mpi_set(v3, t3);
-			t3->sign = sign;
-		}
-		mpi_sub(t1, u1, v1);
-		if (!odd)
-			mpi_sub(t2, u2, v2);
-		mpi_sub(t3, u3, v3);
-		if (t1->sign) {
-			mpi_add(t1, t1, v);
-			if (!odd)
-				mpi_sub(t2, t2, u);
-		}
-	} while (mpi_cmp_ui(t3, 0)); /* while t3 != 0 */
-	/* mpi_lshift( u3, k ); */
-	mpi_set(x, u1);
-
-	mpi_free(u1);
-	mpi_free(v1);
-	mpi_free(t1);
-	if (!odd) {
-		mpi_free(u2);
-		mpi_free(v2);
-		mpi_free(t2);
-	}
-	mpi_free(u3);
-	mpi_free(v3);
-	mpi_free(t3);
-
-	mpi_free(u);
-	mpi_free(v);
-	return 1;
-}
-EXPORT_SYMBOL_GPL(mpi_invm);