- Renamed include directory to polarssl
diff --git a/programs/pkey/mpi_demo.c b/programs/pkey/mpi_demo.c
new file mode 100644
index 0000000..699fa5a
--- /dev/null
+++ b/programs/pkey/mpi_demo.c
@@ -0,0 +1,76 @@
+/*
+ * Simple MPI demonstration program
+ *
+ * Copyright (C) 2006-2007 Christophe Devine
+ *
+ * This program 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.
+ *
+ * This program 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _CRT_SECURE_NO_DEPRECATE
+#define _CRT_SECURE_NO_DEPRECATE 1
+#endif
+
+#include <stdio.h>
+
+#include "xyssl/bignum.h"
+
+int main( void )
+{
+ mpi E, P, Q, N, H, D, X, Y, Z;
+
+ mpi_init( &E, &P, &Q, &N, &H,
+ &D, &X, &Y, &Z, NULL );
+
+ mpi_read_string( &P, 10, "2789" );
+ mpi_read_string( &Q, 10, "3203" );
+ mpi_read_string( &E, 10, "257" );
+ mpi_mul_mpi( &N, &P, &Q );
+
+ printf( "\n Public key:\n\n" );
+ mpi_write_file( " N = ", &N, 10, NULL );
+ mpi_write_file( " E = ", &E, 10, NULL );
+
+ printf( "\n Private key:\n\n" );
+ mpi_write_file( " P = ", &P, 10, NULL );
+ mpi_write_file( " Q = ", &Q, 10, NULL );
+
+ mpi_sub_int( &P, &P, 1 );
+ mpi_sub_int( &Q, &Q, 1 );
+ mpi_mul_mpi( &H, &P, &Q );
+ mpi_inv_mod( &D, &E, &H );
+
+ mpi_write_file( " D = E^-1 mod (P-1)*(Q-1) = ",
+ &D, 10, NULL );
+
+ mpi_read_string( &X, 10, "55555" );
+ mpi_exp_mod( &Y, &X, &E, &N, NULL );
+ mpi_exp_mod( &Z, &Y, &D, &N, NULL );
+
+ printf( "\n RSA operation:\n\n" );
+ mpi_write_file( " X (plaintext) = ", &X, 10, NULL );
+ mpi_write_file( " Y (ciphertext) = X^E mod N = ", &Y, 10, NULL );
+ mpi_write_file( " Z (decrypted) = Y^D mod N = ", &Z, 10, NULL );
+ printf( "\n" );
+
+ mpi_free( &Z, &Y, &X, &D, &H,
+ &N, &Q, &P, &E, NULL );
+
+#ifdef WIN32
+ printf( " Press Enter to exit this program.\n" );
+ fflush( stdout ); getchar();
+#endif
+
+ return( 0 );
+}