Add simple hashlink fuzzers. am: 2ecb77e8f3 am: 3b413d0f6e am: 5cffb36420

Original change: https://android-review.googlesource.com/c/platform/tools/security/+/1869728

Change-Id: Ia3c5d056c59610405430380a7eaa7ffb5af99d3d