VeriFone Vx810 Reference Manual page 105

If one or more certificates fail to authenticate, the ensuing file authentication
process based on signature files also fails, resulting to an application not
authenticated and not allowed to execute on the device.
When a certificate file is authenticated, the data it contains is added to the
certificate tree and the certificate file is deleted from the SRAM. When all
required certificates are authenticated and stored in the certificate tree, the file
authentication process for signature files can proceed.
Figure 33 Display Prompts During the File Authentication Process
5
Signature files are now processed (after certificate files). The file
authentication module calls the signature checking routine once for each new
signature file it detects. Each *.p7s file is checked as it is detected; a list is not
built and multiple processing passes are not required.
•
If a signature file is authenticated, "
file is flagged authentic.
•
If the authentication process fails, "
and the device beeps three times. The routine continues processing the
next signature file until all newly detected signature files are checked.
•
If a signature file fails to authenticate and its target file is an executable
code file, such as *.out or *.lib, the executable is not allowed to run on
device restart.
For data files, font files, and any other files that require authentication to meet
the application's design specification, the application must ensure that these
files are successfully authenticated.
While a signature file is being processed, it remains stored in the SRAM file
system of the target file group. The target application file may be redirected
immediately on download to the SRAM or flash ROM.
P
ERFORMING
File Authentication Requirements
" is displayed and the target
AUTHENTIC
" is displayed for five seconds
FAILED
X
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OWNLOADS
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EFERENCE UIDE