/usr/share/maven-repo/org/bouncycastle/bcprov/debian/bcprov-debian.jar is in libbcprov-java 1.56-1+deb9u2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/org/bouncycastle/bcprov/debian/../../../../../java/bcprov-1.56.jar