MD5 message-digest algorithm.

Used in Qt Core (QCryptographicHash). Configure with -DQT_CRYPTOGRAPHICHASH_ONLY_SHA1 to avoid.

The sources can be found in doc/src/qtcoreattributions.

Written by Colin Plumb in 1993, no copyright is claimed.
    Ian Jackson <ian@chiark.greenend.org.uk>.

Public Domain.