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<bean id="SHA256SaltedUserAuthenticator" class="com.cloud.server.auth.SHA256SaltedUserAuthenticator">
      <property name="name" value="SHA256SALT"/>
      <property name="passwordCheckers" value="#{passwordCheckersRegistry.registered}"/>
</bean>

Default Plugin

cloudstack gives the following default plugin to support password checker which gets registered with Extension Registry.

plugins/security/password-checker.

It has the following bean declaration in spring-password-checker.xml

<bean id="passwordChecker" class="org.apache.cloudstack.security.password.PasswordCheckerImpl">
         <property name="name" value="DEFAULTPASSWORDCHECKER"/>
        <!-- Comment any of the below sections you want modify if you are having requirements which are differing with default values -->
        <!-- property name="minLength" value="8"/ -->
        <!-- property name="maxLength" value="16"/ -->
        <!-- property name="passwordCheckerPropertiesFile" value="password-checker.properties"/ -->
</bean>

References

 (1)  http://ianduffy.ie/cloudstack/CreatingAPlugin.pdf