diff --git a/programs/pkey/key_app_writer.c b/programs/pkey/key_app_writer.c
new file mode 100644
index 0000000..af508d2
--- /dev/null
+++ b/programs/pkey/key_app_writer.c
@@ -0,0 +1,347 @@
+/*
+ *  Key reading application
+ *
+ *  Copyright (C) 2006-2011, 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 <stdlib.h>
+#include <stdio.h>
+
+#include "polarssl/config.h"
+
+#include "polarssl/error.h"
+#include "polarssl/rsa.h"
+#include "polarssl/x509.h"
+#include "polarssl/base64.h"
+#include "polarssl/x509write.h"
+
+#define MODE_NONE               0
+#define MODE_PRIVATE            1
+#define MODE_PUBLIC             2
+
+#define OUTPUT_MODE_NONE               0
+#define OUTPUT_MODE_PRIVATE            1
+#define OUTPUT_MODE_PUBLIC             2
+
+#define DFL_MODE                MODE_NONE
+#define DFL_FILENAME            "keyfile.key"
+#define DFL_DEBUG_LEVEL         0
+#define DFL_OUTPUT_MODE          OUTPUT_MODE_NONE
+#define DFL_OUTPUT_FILENAME     "keyfile.pem"
+
+/*
+ * global options
+ */
+struct options
+{
+    int mode;                   /* the mode to run the application in   */
+    char *filename;             /* filename of the key file             */
+    int debug_level;            /* level of debugging                   */
+    int output_mode;            /* the output mode to use               */
+    char *output_file;          /* where to store the constructed key file  */
+} opt;
+
+void my_debug( void *ctx, int level, const char *str )
+{
+    if( level < opt.debug_level )
+    {
+        fprintf( (FILE *) ctx, "%s", str );
+        fflush(  (FILE *) ctx  );
+    }
+}
+
+void write_public_key( rsa_context *rsa, char *output_file )
+{
+    FILE *f;
+    unsigned char output_buf[4096];
+    unsigned char base_buf[4096];
+    unsigned char *c;
+    int ret;
+    size_t len = 0, olen = 4096;
+
+    memset(output_buf, 0, 4096);
+    ret = x509_write_pubkey_der( output_buf, 4096, rsa );
+
+    if( ret < 0 )
+        return;
+
+    len = ret;
+    c = output_buf + 4095 - len;
+
+    base64_encode( base_buf, &olen, c, len );
+
+    c = base_buf;
+
+    f = fopen( output_file, "w" );
+    fprintf(f, "-----BEGIN PUBLIC KEY-----\n");
+    while (olen)
+    {
+        int use_len = olen;
+        if (use_len > 64) use_len = 64;
+        fwrite( c, 1, use_len, f );
+        olen -= use_len;
+        c += use_len;
+        fprintf(f, "\n");
+    }
+    fprintf(f, "-----END PUBLIC KEY-----\n");
+    fclose(f);
+}
+
+void write_private_key( rsa_context *rsa, char *output_file )
+{
+    FILE *f;
+    unsigned char output_buf[4096];
+    unsigned char base_buf[4096];
+    unsigned char *c;
+    int ret;
+    size_t len = 0, olen = 4096;
+
+    memset(output_buf, 0, 4096);
+    ret = x509_write_key_der( output_buf, 4096, rsa );
+    if( ret < 0 )
+        return;
+
+    len = ret;
+    c = output_buf + 4095 - len;
+
+    base64_encode( base_buf, &olen, c, len );
+
+    c = base_buf;
+
+    f = fopen( output_file, "w" );
+    fprintf(f, "-----BEGIN RSA PRIVATE KEY-----\n");
+    while (olen)
+    {
+        int use_len = olen;
+        if (use_len > 64) use_len = 64;
+        fwrite( c, 1, use_len, f );
+        olen -= use_len;
+        c += use_len;
+        fprintf(f, "\n");
+    }
+    fprintf(f, "-----END RSA PRIVATE KEY-----\n");
+    fclose(f);
+}
+
+#define USAGE \
+    "\n usage: key_app param=<>...\n"                   \
+    "\n acceptable parameters:\n"                       \
+    "    mode=private|public default: none\n"           \
+    "    filename=%%s         default: keyfile.key\n"   \
+    "    debug_level=%%d      default: 0 (disabled)\n"  \
+    "    output_mode=private|public default: none\n"    \
+    "    output_file=%%s      defeult: keyfile.pem\n"   \
+    "\n"
+
+#if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_RSA_C) ||         \
+    !defined(POLARSSL_X509_PARSE_C) || !defined(POLARSSL_FS_IO)
+int main( int argc, char *argv[] )
+{
+    ((void) argc);
+    ((void) argv);
+
+    printf("POLARSSL_BIGNUM_C and/or POLARSSL_RSA_C and/or "
+           "POLARSSL_X509_PARSE_C and/or POLARSSL_FS_IO not defined.\n");
+    return( 0 );
+}
+#else
+int main( int argc, char *argv[] )
+{
+    int ret = 0;
+    rsa_context rsa;
+    char buf[1024];
+    int i, j, n;
+    char *p, *q;
+
+    /*
+     * Set to sane values
+     */
+    memset( &rsa, 0, sizeof( rsa_context ) );
+    memset( buf, 0, 1024 );
+
+    if( argc == 0 )
+    {
+    usage:
+        printf( USAGE );
+        goto exit;
+    }
+
+    opt.mode                = DFL_MODE;
+    opt.filename            = DFL_FILENAME;
+    opt.debug_level         = DFL_DEBUG_LEVEL;
+    opt.output_mode         = DFL_OUTPUT_MODE;
+    opt.output_file         = DFL_OUTPUT_FILENAME;
+
+    for( i = 1; i < argc; i++ )
+    {
+        n = strlen( argv[i] );
+
+        for( j = 0; j < n; j++ )
+        {
+            if( argv[i][j] >= 'A' && argv[i][j] <= 'Z' )
+                argv[i][j] |= 0x20;
+        }
+
+        p = argv[i];
+        if( ( q = strchr( p, '=' ) ) == NULL )
+            goto usage;
+        *q++ = '\0';
+
+        if( strcmp( p, "mode" ) == 0 )
+        {
+            if( strcmp( q, "private" ) == 0 )
+                opt.mode = MODE_PRIVATE;
+            else if( strcmp( q, "public" ) == 0 )
+                opt.mode = MODE_PUBLIC;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "output_mode" ) == 0 )
+        {
+            if( strcmp( q, "private" ) == 0 )
+                opt.output_mode = OUTPUT_MODE_PRIVATE;
+            else if( strcmp( q, "public" ) == 0 )
+                opt.output_mode = OUTPUT_MODE_PUBLIC;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "filename" ) == 0 )
+            opt.filename = q;
+        else if( strcmp( p, "output_file" ) == 0 )
+            opt.output_file = q;
+        else if( strcmp( p, "debug_level" ) == 0 )
+        {
+            opt.debug_level = atoi( q );
+            if( opt.debug_level < 0 || opt.debug_level > 65535 )
+                goto usage;
+        }
+        else
+            goto usage;
+    }
+
+    if( opt.mode == MODE_NONE && opt.output_mode != OUTPUT_MODE_NONE )
+    {
+        printf( "\nCannot output a key without reading one.\n");
+        goto exit;
+    }
+
+    if( opt.mode == MODE_PUBLIC && opt.output_mode == OUTPUT_MODE_PRIVATE )
+    {
+        printf( "\nCannot output a private key from a public key.\n");
+        goto exit;
+    }
+
+    if( opt.mode == MODE_PRIVATE )
+    {
+        /*
+         * 1.1. Load the key
+         */
+        printf( "\n  . Loading the private key ..." );
+        fflush( stdout );
+
+        ret = x509parse_keyfile( &rsa, opt.filename, NULL );
+
+        if( ret != 0 )
+        {
+#ifdef POLARSSL_ERROR_C
+            error_strerror( ret, buf, 1024 );
+#endif
+            printf( " failed\n  !  x509parse_key returned %d - %s\n\n", ret, buf );
+            rsa_free( &rsa );
+            goto exit;
+        }
+
+        printf( " ok\n" );
+
+        /*
+         * 1.2 Print the key
+         */
+        printf( "  . Key information    ...\n" );
+        mpi_write_file( "N:  ", &rsa.N, 16, NULL );
+        mpi_write_file( "E:  ", &rsa.E, 16, NULL );
+        mpi_write_file( "D:  ", &rsa.D, 16, NULL );
+        mpi_write_file( "P:  ", &rsa.P, 16, NULL );
+        mpi_write_file( "Q:  ", &rsa.Q, 16, NULL );
+        mpi_write_file( "DP: ", &rsa.DP, 16, NULL );
+        mpi_write_file( "DQ:  ", &rsa.DQ, 16, NULL );
+        mpi_write_file( "QP:  ", &rsa.QP, 16, NULL );
+
+    }
+    else if( opt.mode == MODE_PUBLIC )
+    {
+        /*
+         * 1.1. Load the key
+         */
+        printf( "\n  . Loading the public key ..." );
+        fflush( stdout );
+
+        ret = x509parse_public_keyfile( &rsa, opt.filename );
+
+        if( ret != 0 )
+        {
+#ifdef POLARSSL_ERROR_C
+            error_strerror( ret, buf, 1024 );
+#endif
+            printf( " failed\n  !  x509parse_public_key returned %d - %s\n\n", ret, buf );
+            rsa_free( &rsa );
+            goto exit;
+        }
+
+        printf( " ok\n" );
+
+        /*
+         * 1.2 Print the key
+         */
+        printf( "  . Key information    ...\n" );
+        mpi_write_file( "N: ", &rsa.N, 16, NULL );
+        mpi_write_file( "E:  ", &rsa.E, 16, NULL );
+    }
+    else
+        goto usage;
+
+    if( opt.output_mode == OUTPUT_MODE_PUBLIC )
+    {
+        write_public_key( &rsa, opt.output_file );
+    }
+    if( opt.output_mode == OUTPUT_MODE_PRIVATE )
+    {
+        write_private_key( &rsa, opt.output_file );
+    }
+
+exit:
+
+    rsa_free( &rsa );
+
+#if defined(_WIN32)
+    printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    return( ret );
+}
+#endif /* POLARSSL_BIGNUM_C && POLARSSL_RSA_C &&
+          POLARSSL_X509_PARSE_C && POLARSSL_FS_IO */