cr-marcstevens/sha1collisiondetection is the library for calculating SHA-1 hash as well as detecting a hash collision. This is a JNI bridge of this library.
This is not an official Google product. This is the author's hobby project. Not for production use.
Use Bazel. I'm not sure how I can create a distributable package with JNI. You would need to change the BUILD files in order to build non-Linux environment.
Note that Sha1DcHasher itself doesn't load the native library. You would need
to load sha1dc_jni_bridge.so somewhere else.
This is not a serious benchmark. It's better to do your own benchmarking if
you're looking into this. With bazel test ... -c opt in the author's
workstation:
Hashing 2MiB chunked 40MiB file 100 times (== hashing ~ 4GiB)
JGit SHA1: 18152ms
Sha1DcHasher (DirectBuffer): 9812ms
Sha1DcHasher (ByteArray, Copy): 10937ms
Sha1DcHasher (ByteArray, GCLock): 9831ms
Standard SHA-1 Hasher (ByteArray): 12160ms
JGit's SHA1 class and Sha1DcHasher class are collision detection enabled
implementations.