MD4
An OpenSSL-compatible implementation of the RSA Data Security, Inc. MD4 Message-Digest Algorithm.
Used in Qt Core (QCryptographicHash).
The sources can be found in qt5/qtbase/src/3rdparty/md4.
Written by Alexander Peslyak - better known as Solar Designer <solar@openwall.com> - in 2001, and placed in the public domain. There's absolutely no warranty.
Public Domain.