- Added rsa_encrypt and rsa_decrypt example programs
diff --git a/programs/pkey/rsa_decrypt.c b/programs/pkey/rsa_decrypt.c
new file mode 100644
index 0000000..d00cdaa
--- /dev/null
+++ b/programs/pkey/rsa_decrypt.c
@@ -0,0 +1,144 @@
+/*
+ * RSA simple decryption program
+ *
+ * Copyright (C) 2006-2010, Brainspark B.V.
+ *
+ * This file is part of PolarSSL (http://www.polarssl.org)
+ * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ * All rights reserved.
+ *
+ * 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 <string.h>
+#include <stdio.h>
+
+#include "polarssl/config.h"
+
+#include "polarssl/rsa.h"
+
+#if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_RSA_C) || \
+ !defined(POLARSSL_FS_IO)
+int main( void )
+{
+ printf("POLARSSL_BIGNUM_C and/or POLARSSL_RSA_C and/or "
+ "POLARSSL_FS_IO not defined.\n");
+ return( 0 );
+}
+#else
+int main( int argc, char *argv[] )
+{
+ FILE *f;
+ int ret, c;
+ size_t i;
+ rsa_context rsa;
+ unsigned char result[1024];
+ unsigned char buf[512];
+ ((void) argv);
+
+ ret = 1;
+ if( argc != 1 )
+ {
+ printf( "usage: rsa_decrypt\n" );
+
+#ifdef WIN32
+ printf( "\n" );
+#endif
+
+ goto exit;
+ }
+
+ printf( "\n . Reading public key from rsa_pub.txt" );
+ fflush( stdout );
+
+ if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
+ {
+ printf( " failed\n ! Could not open rsa_pub.txt\n" \
+ " ! Please run rsa_genkey first\n\n" );
+ goto exit;
+ }
+
+ rsa_init( &rsa, RSA_PKCS_V15, 0 );
+
+ if( ( ret = mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
+ ( ret = mpi_read_file( &rsa.E, 16, f ) ) != 0 )
+ {
+ printf( " failed\n ! mpi_read_file returned %d\n\n", ret );
+ goto exit;
+ }
+
+ rsa.len = ( mpi_msb( &rsa.N ) + 7 ) >> 3;
+
+ fclose( f );
+
+ /*
+ * Extract the RSA encrypted value from the text file
+ */
+ ret = 1;
+
+ if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
+ {
+ printf( "\n ! Could not open %s\n\n", "result-enc.txt" );
+ goto exit;
+ }
+
+ i = 0;
+
+ while( fscanf( f, "%02X", &c ) > 0 &&
+ i < (int) sizeof( buf ) )
+ buf[i++] = (unsigned char) c;
+
+ fclose( f );
+
+ if( i != rsa.len )
+ {
+ printf( "\n ! Invalid RSA signature format\n\n" );
+ goto exit;
+ }
+
+ /*
+ * Decrypt the encrypted RSA data and print the result.
+ */
+ printf( "\n . Decrypting the encrypted data" );
+ fflush( stdout );
+
+ if( ( ret = rsa_pkcs1_decrypt( &rsa, RSA_PUBLIC, &i, buf, result,
+ 1024 ) ) != 0 )
+ {
+ printf( " failed\n ! rsa_pkcs1_decrypt returned %d\n\n", ret );
+ goto exit;
+ }
+
+ printf( "\n . OK\n\n" );
+
+ printf( "The decrypted result is: '%s'\n\n", result );
+
+ ret = 0;
+
+exit:
+
+#ifdef WIN32
+ printf( " + Press Enter to exit this program.\n" );
+ fflush( stdout ); getchar();
+#endif
+
+ return( ret );
+}
+#endif /* POLARSSL_BIGNUM_C && POLARSSL_RSA_C && POLARSSL_FS_IO */