C
The following are some C programs. Most of them were written for my personal study.
Perhaps some of them will be useful to others too.

MD4:
A naive and straightforward implementation of MD4 hash function as described
in the Handbook of Applied Cryptography.
[EXE]
[ZIP]

MD5:
A naive and straightforward implementation of MD5 hash function
as described in the Handbook of Applied Cryptography.
[EXE]
[ZIP]

SHA1:
A naive and straightforward implementation of SHA1 hash function as described in the Handbook of Applied Cryptography.
[EXE]
[ZIP]