This artifact originates from the Orbit Project at Eclipse, it is an osgi bundle and is signed as well.
'org.eclipse.jetty.orbit:org.objectweb.asm:3.3.1.v201105211655'
<dependency>
<groupId>org.eclipse.jetty.orbit</groupId>
<artifactId>org.objectweb.asm</artifactId>
<version>3.3.1.v201105211655</version>
</dependency>
<dependency org="org.eclipse.jetty.orbit" name="org.objectweb.asm" rev="3.3.1.v201105211655"/>
"org.eclipse.jetty.orbit", "org.objectweb.asm", "3.3.1.v201105211655"