Edit: /usr/share/doc/libxcrypt/README.rhel (599B)
This version of the libxcrypt package ships the libcrypt.so.2
library and does not provide the legacy API functions that have
been provided by glibc's libcrypt.so.1. The removed functions
by name are encrypt, encrypt_r, setkey, setkey_r, and fcrypt.
If you are using a third-party application that links against
those functions, or that is linked against glibc's libcrypt,
you may need to install the libxcrypt-compat package manually.
All existing binary executables linked against glibc's libcrypt
should work unmodified with the libcrypt.so.1 library supplied
by the libxcrypt-compat package.