Initial revision

1 files changed, 275 insertions, 0 deletions

diff --git a/pwmanager/libcrypt/mpi/mpi-inv.c b/pwmanager/libcrypt/mpi/mpi-inv.c
new file mode 100644
index 0000000..2e737b8
--- a/dev/null
+++ b/pwmanager/libcrypt/mpi/mpi-inv.c
@@ -0,0 +1,275 @@
+/* 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "mpi-internal.h"
+#include "g10lib.h"
+
+/****************
+ * Calculate the multiplicative inverse X of A mod N
+ * That is: Find the solution x for
+ *		1 = (a*x) mod n
+ */
+void
+_gcry_mpi_invm( gcry_mpi_t x, gcry_mpi_t a, gcry_mpi_t n )
+{
+#if 0
+    gcry_mpi_t u, v, u1, u2, u3, v1, v2, v3, q, t1, t2, t3;
+    gcry_mpi_t ta, tb, tc;
+
+    u = mpi_copy(a);
+    v = mpi_copy(n);
+    u1 = mpi_alloc_set_ui(1);
+    u2 = mpi_alloc_set_ui(0);
+    u3 = mpi_copy(u);
+    v1 = mpi_alloc_set_ui(0);
+    v2 = mpi_alloc_set_ui(1);
+    v3 = mpi_copy(v);
+    q  = mpi_alloc( mpi_get_nlimbs(u)+1 );
+    t1 = mpi_alloc( mpi_get_nlimbs(u)+1 );
+    t2 = mpi_alloc( mpi_get_nlimbs(u)+1 );
+    t3 = mpi_alloc( mpi_get_nlimbs(u)+1 );
+    while( mpi_cmp_ui( v3, 0 ) ) {
+	mpi_fdiv_q( q, u3, v3 );
+	mpi_mul(t1, v1, q); mpi_mul(t2, v2, q); mpi_mul(t3, v3, q);
+	mpi_sub(t1, u1, t1); mpi_sub(t2, u2, t2); mpi_sub(t3, u3, t3);
+	mpi_set(u1, v1); mpi_set(u2, v2); mpi_set(u3, v3);
+	mpi_set(v1, t1); mpi_set(v2, t2); mpi_set(v3, t3);
+    }
+    /*	log_debug("result:\n");
+	log_mpidump("q =", q );
+	log_mpidump("u1=", u1);
+	log_mpidump("u2=", u2);
+	log_mpidump("u3=", u3);
+	log_mpidump("v1=", v1);
+	log_mpidump("v2=", v2); */
+    mpi_set(x, u1);
+
+    mpi_free(u1);
+    mpi_free(u2);
+    mpi_free(u3);
+    mpi_free(v1);
+    mpi_free(v2);
+    mpi_free(v3);
+    mpi_free(q);
+    mpi_free(t1);
+    mpi_free(t2);
+    mpi_free(t3);
+    mpi_free(u);
+    mpi_free(v);
+#elif 0
+    /* Extended Euclid's algorithm (See TAOCP Vol II, 4.5.2, Alg X)
+     * modified according to Michael Penk's solution for Exercise 35 */
+
+    /* FIXME: we can simplify this in most cases (see Knuth) */
+    gcry_mpi_t u, v, u1, u2, u3, v1, v2, v3, t1, t2, t3;
+    unsigned k;
+    int sign;
+
+    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);
+    }
+
+
+    u1 = mpi_alloc_set_ui(1);
+    u2 = mpi_alloc_set_ui(0);
+    u3 = mpi_copy(u);
+    v1 = mpi_copy(v);				   /* !-- used as const 1 */
+    v2 = mpi_alloc( mpi_get_nlimbs(u) ); mpi_sub( v2, u1, u );
+    v3 = mpi_copy(v);
+    if( mpi_test_bit(u, 0) ) { /* u is odd */
+	t1 = mpi_alloc_set_ui(0);
+	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);
+	t2 = mpi_alloc_set_ui(0);
+	t3 = mpi_copy(u);
+    }
+    do {
+	do {
+	    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);
+	  Y4:
+	    ;
+	} while( !mpi_test_bit( t3, 0 ) ); /* while t3 is even */
+
+	if( !t3->sign ) {
+	    mpi_set(u1, t1);
+	    mpi_set(u2, t2);
+	    mpi_set(u3, t3);
+	}
+	else {
+	    mpi_sub(v1, v, t1);
+	    sign = u->sign; u->sign = !u->sign;
+	    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);
+	mpi_sub(t2, u2, v2);
+	mpi_sub(t3, u3, v3);
+	if( t1->sign ) {
+	    mpi_add(t1, t1, v);
+	    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(u2);
+    mpi_free(u3);
+    mpi_free(v1);
+    mpi_free(v2);
+    mpi_free(v3);
+    mpi_free(t1);
+    mpi_free(t2);
+    mpi_free(t3);
+#else
+    /* 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 */
+    gcry_mpi_t u, v, u1, u2=NULL, u3, v1, v2=NULL, v3, t1, t2=NULL, t3;
+    unsigned k;
+    int sign;
+    int odd ;
+
+    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);
+#endif
+}
+
+
+int
+gcry_mpi_invm (gcry_mpi_t x, gcry_mpi_t a, gcry_mpi_t n)
+{
+  _gcry_mpi_invm (x, a, n);
+  return 1;
+}