There is a [http://homes.esat.kuleuven.be/~bosselae/ripemd160.html RIPEMD-160 home page], with test vectors and [http://www.esat.kuleuven.be/~bosselae/ripemd/rmd160.txt pseudocode for RIPEMD-160].
For padding the message, RIPEMD-160 acts like [[MD4]] (RFC 1320).