diff --git a/programs/pkey/pk_encrypt.c b/programs/pkey/pk_encrypt.c
new file mode 100644
index 0000000..5d7d1e0
--- /dev/null
+++ b/programs/pkey/pk_encrypt.c
@@ -0,0 +1,155 @@
+/*
+ *  RSA simple data encryption program
+ *
+ *  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 <stdio.h>
+
+#include "polarssl/config.h"
+
+#include "polarssl/error.h"
+#include "polarssl/pk.h"
+#include "polarssl/entropy.h"
+#include "polarssl/ctr_drbg.h"
+
+#if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_PK_PARSE_C) ||  \
+    !defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_FS_IO) || \
+    !defined(POLARSSL_CTR_DRBG_C)
+int main( int argc, char *argv[] )
+{
+    ((void) argc);
+    ((void) argv);
+
+    printf("POLARSSL_BIGNUM_C and/or POLARSSL_PK_PARSE_C and/or "
+           "POLARSSL_ENTROPY_C and/or POLARSSL_FS_IO and/or "
+           "POLARSSL_CTR_DRBG_C not defined.\n");
+    return( 0 );
+}
+#else
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret;
+    size_t i, olen = 0;
+    pk_context pk;
+    entropy_context entropy;
+    ctr_drbg_context ctr_drbg;
+    unsigned char input[1024];
+    unsigned char buf[512];
+    const char *pers = "pk_encrypt";
+
+    ret = 1;
+
+    if( argc != 3 )
+    {
+        printf( "usage: pk_encrypt <key_file> <string of max 100 characters>\n" );
+
+#if defined(_WIN32)
+        printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    entropy_init( &entropy );
+    if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
+                               (const unsigned char *) pers,
+                               strlen( pers ) ) ) != 0 )
+    {
+        polarssl_strerror( ret, (char *) buf, sizeof(buf) );
+        printf( " failed\n  ! ctr_drbg_init returned -0x%04x - %s\n\n", -ret, buf );
+        goto exit;
+    }
+
+    printf( "\n  . Reading public key from '%s'", argv[1] );
+    fflush( stdout );
+
+    pk_init( &pk );
+
+    if( ( ret = pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
+    {
+        polarssl_strerror( ret, (char *) buf, sizeof(buf) );
+        printf( " failed\n  ! pk_parse_public_keyfile returned -0x%04x - %s\n\n", -ret, buf );
+        goto exit;
+    }
+
+    if( strlen( argv[2] ) > 100 )
+    {
+        printf( " Input data larger than 100 characters.\n\n" );
+        goto exit;
+    }
+
+    memcpy( input, argv[2], strlen( argv[2] ) );
+
+    /*
+     * Calculate the RSA encryption of the hash.
+     */
+    printf( "\n  . Generating the encrypted value" );
+    fflush( stdout );
+
+    if( ( ret = pk_encrypt( &pk, input, strlen( argv[2] ),
+                            buf, &olen, sizeof(buf),
+                            ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        polarssl_strerror( ret, (char *) buf, sizeof(buf) );
+        printf( " failed\n  ! pk_encrypt returned -0x%04x - %s\n\n", -ret, buf );
+        goto exit;
+    }
+
+    /*
+     * Write the signature into result-enc.txt
+     */
+    if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
+    {
+        ret = 1;
+        printf( " failed\n  ! Could not create %s\n\n", "result-enc.txt" );
+        goto exit;
+    }
+
+    for( i = 0; i < olen; i++ )
+        fprintf( f, "%02X%s", buf[i],
+                 ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
+
+    fclose( f );
+
+    printf( "\n  . Done (created \"%s\")\n\n", "result-enc.txt" );
+
+exit:
+
+#if defined(_WIN32)
+    printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    return( ret );
+}
+#endif /* POLARSSL_BIGNUM_C && POLARSSL_PK_PARSE_C && POLARSSL_ENTROPY_C &&
+          POLARSSL_FS_IO && POLARSSL_CTR_DRBG_C */