Verifying Signed Oracle Instant Client Zip Files

Use the Java utility jarsigner to verify the integrity of your Oracle Instant Client zip files.

To verify the integrity of the Oracle Instant Client installation zip files before you extract the installation files:

Go to the directory where you have downloaded the zip file.
Run the jarsigner command with the -verify option to quickly check your installation zip file:
```
jarsigner -verify instant_client_zip_file
```
For example, to check the Oracle Instant Client Basic package zip file for Linux x86-64:
```
jarsigner -verify instantclient-basic-linux.x64-19.22.0.0.0dbru.zip
jar verified.
```
If you want detailed certificate information, then use the -verify option along with the -verbose:summary and -certs options. For example:
```
jarsigner -verify -verbose:summary -certs instantclient-basic-linux.x64-19.22.0.0.0dbru.zip
```

For more jarsigner options, type jarsigner -h or review the jarsigner reference documentation.

Parent topic: Verifying Oracle Instant Client Code Signing