# Sign a JAR file using AWS CloudHSM and Jarsigner
<a name="jarsigner_sign_jar_using_hsm_jarsigner"></a>

Use the following command to sign a JAR file using AWS CloudHSM and jarsigner: 

```
jarsigner -keystore example_keystore.store \
        -signedjar signthisclass_signed.jar \
        -sigalg sha512withrsa \
        -storetype CloudHSM \
        -J-classpath '-J/opt/cloudhsm/java/*:/usr/lib/jvm/java-1.8.0/lib/tools.jar' \
        -J-Djava.library.path=/opt/cloudhsm/lib \
        signthisclass.jar {{<key pair label>}}
```

Use the following command to verify a signed JAR: 

```
jarsigner -verify \
        -keystore example_keystore.store \
        -sigalg sha512withrsa \
        -storetype CloudHSM \
        -J-classpath '-J/opt/cloudhsm/java/*:/usr/lib/jvm/java-1.8.0/lib/tools.jar' \
        -J-Djava.library.path=/opt/cloudhsm/lib \
        signthisclass_signed.jar {{<key pair label>}}
```