fast-pseudorandom is a C program that outputs random binary data.

lcgrng is a Python script that outputs random binary data as well using the same algorithm.

Note that fast-pseudorandom is about 100x faster than lcgrng, at least on the one system I compared them on.

Also, fast-pseudorandom requires a number of bytes that is a multiple of 262144.  lcgrng only requires a multiple of 8.