VeriFone VX 520 Specifications Page 94

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FILE AUTHENTICATION
VeriShield File Signing Tool
94 VX 520 REFERENCE GUIDE
The normal size of a signature file is approximately 400 bytes. Depending on the
application’s size and on how memory space is allocated, the area available for
storing multiple signature files must be carefully managed. The memory space
required by a certificate file is also approximately 400 bytes, but certificate files
are temporary. When a certificate is authenticated, the data it contains is copied to
the certificate tree, and the certificate file is erased from the target file group’s
RAM.
VeriShield File
Signing Tool
To generate the signature files required for file authentication, you must sign all
executable files and other files to be logically protected using the VeriShield File
Signing Tool. This section discusses the use of this tool, which is included in the
Verix V DTK.
The VeriShield File Signing Tool generates a formatted file called a signature file,
recognized by the filename extension *.p7s.
You can run the VeriShield File Signing Tool on a host computer (PC) in DOS
command-line mode, or invoke the program under Windows NT or Windows 95
and then use the VeriShield File Signing Tool dialog box to make the required
entries.
For more information about the VeriShield File Signing Tool, see the VeriShield
Online Help (VPN 22311).
VeriShield File
Signing Tool System
Requirements
The VeriShield File Signing Tool requires one of the following computing
environments:
Windows NT, Version 4.0, SP5
Windows 95, with Internet Explorer Version 5.0
The SP5 and Internet Explorer Version 5.0 software can be downloaded from the
Microsoft Web site located at www.microsoft.com.
Operating Modes for
the VeriShield File
Signing Tool
The VeriShield File Signing Tool can run on the host computer in two user modes:
Command-line mode (Windows PC DOS shell): Command-line mode is
useful for application developers who perform batch file downloads and is
convenient when using file download tools provided by VeriFone, such as the
VeriCentre Download Management Module (DMM) and the DDL.EXE direct
download utility. In command-line mode, you can sign a batch of files in a
single operation.
NOTE
The file signing process for operating system files is done for VX 520 customers
by the VeriFone CA. For operating system updates, VeriFone provides
customers with a complete download package that includes all certificates and
signature files required for authentication.
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