diff --git a/programs/pkey/rsa_verify.c b/programs/pkey/rsa_verify.c
new file mode 100644
index 0000000..aacc664
--- /dev/null
+++ b/programs/pkey/rsa_verify.c
@@ -0,0 +1,133 @@
+/*
+ *  RSA/SHA-1 signature verification 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 <string.h>
+#include <stdio.h>
+
+#include "xyssl/rsa.h"
+#include "xyssl/sha1.h"
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret, i, c;
+    rsa_context rsa;
+    unsigned char hash[20];
+    unsigned char buf[512];
+
+    ret = 1;
+    if( argc != 2 )
+    {
+        printf( "usage: rsa_verify <filename>\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, NULL, NULL );
+
+    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 signature from the text file
+     */
+    ret = 1;
+    i = strlen( argv[1] );
+    memcpy( argv[1] + i, ".sig", 5 );
+
+    if( ( f = fopen( argv[1], "rb" ) ) == NULL )
+    {
+        printf( "\n  ! Could not open %s\n\n", argv[1] );
+        goto exit;
+    }
+
+    argv[1][i] = '\0', 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;
+    }
+
+    /*
+     * Compute the SHA-1 hash of the input file and compare
+     * it with the hash decrypted from the RSA signature.
+     */
+    printf( "\n  . Verifying the RSA/SHA-1 signature" );
+    fflush( stdout );
+
+    if( ( ret = sha1_file( argv[1], hash ) ) != 0 )
+    {
+        printf( " failed\n  ! Could not open or read %s\n\n", argv[1] );
+        goto exit;
+    }
+
+    if( ( ret = rsa_pkcs1_verify( &rsa, RSA_PUBLIC, RSA_SHA1,
+                                  20, hash, buf ) ) != 0 )
+    {
+        printf( " failed\n  ! rsa_pkcs1_verify returned %d\n\n", ret );
+        goto exit;
+    }
+
+    printf( "\n  . OK (the decrypted SHA-1 hash matches)\n\n" );
+
+    ret = 0;
+
+exit:
+
+#ifdef WIN32
+    printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    return( ret );
+}