VeriFone VX 680 Reference Manual page 73

If the signature file authenticates its target file, and if the *FA variable is present in
the
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retained in memory and is automatically moved, if necessary, into the same logical
file system (I: or F:) as the target file it authenticates. That is, if the target file is
identified as an F: drive file, the signature file is also identified as an F: drive file; if
the target file is identified as an I: drive file, the signature file is also is identified as
an I: drive file.
Normally signature files are retained in the terminal even after being used to
NOTE
authenticate executable (code) or data files. This is to facilitate back-to-back
downloads, as described in
back-to-back downloads can remove signature files after use, gaining space for
other files. Automatic removal is performed if the user sets *FA=0 in the
file of Group 1. The main reason for using *FA is to force automatic
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removal. If the user desires the default behavior (retain signature files, to allow
for back-to-back downloads), the user does not need to set *FA.
If the signature file authenticates its target file and the *FA variable is present in
the
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erased when its target file is authenticated.
If you intend to perform back-to-back downloads, as described in
Downloads, all signature files must be retained in the VX 680 terminal's
application memory, together with the target application files they authenticate.
To control if signature files are retained or deleted when they are processed by
NOTE
the file authentication module, you must use the protected
*FA as documented in the Verix eVo Volume I: Operating System Programmers
Manual (VPN DOC00301).
Restrictions on Downloading Different File Types
A typical application download includes a variety of different file types. The
following restrictions in
files to the VX 680 terminal and how files are stored in the file system:
Table 11
File Type
Certificate
(*.crt)
Signature
(*.p7s)
Operating system
file of the target file group and is set to 1, the signature file is
Chapter 5. Users who do not intend to perform
file of the target file group and is set to 0, the signature file is
Table 11 describe how you can download different kinds of
Download File Extensions
Restriction
Must be downloaded into the I: drive of the target file group
(GID1–GID15) selected in Verix Terminal Manager.
Must be downloaded into the I: drive of the target file group
(GID1–GID15) selected in Verix Terminal Manager.
Must be downloaded into Group 1 I: drive. When the OS files,
related certificates and signature files are authenticated, they are
automatically moved from Group 1 I: drive into the Group 0 sub-
partition reserved for the operating system.
F A
ILE UTHENTICATION
File Authentication and the File System
Performing
variable
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VX 680 R G
EFERENCE
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