md5_reducer

Makes MD5sums with fewer bits. It could be useful for making smaller databases or somehow reducing your footprint.

Installation

This uses Rust and Cargo and so the installation is

cargo build --release
# update the path or cp the executable to your existing path
export PATH=$PATH:$(realpath ./target/release)
# or 
cp -nv ./target/release/md5_reducer $HOME/bin/

Usage

Usage: md5_reducer [OPTIONS] --bits <BITS>

Options:
  -m, --md5 <MD5>    The MD5 hash to be reduced
  -b, --bits <BITS>  The maximum number of bits for the reduced hash
  -v, --verbose      Sets the level of verbosity
  -h, --help         Print help
  -V, --version      Print version

Example

$ ./target/release/md5_reducer --md5 d41d8cd98f00b204e9800998ecf8427e --bits 56
0       3606500887663242

API

You can use the function in your own rust projects

let md5 = "d41d8cd98f00b204e9800998ecf8427e";
let max_bits = 56;
let iterations = 1000000;

let start = std::time::Instant::now();
for _ in 0..iterations {
    reduce_md5(md5, max_bits);
}

Benchmark

Run the cargo test to run 1M hashes

cargo test

Which produces something like

running 1 test
test test_speed ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 7.43s