SHA224Update in libc and libmd. Solaris uses "void *" where we use
"unsigned char *" so we need a check for that too. Solaris sha2.h
defines SHA224, SHA256, SHA384, and SHA512 so rename those tokens.
Adapted from changes from Vladimir Marek in bug #641.
Currently supports SHA-224, SHA-256, SHA-384, SHA-512.
TODO: checksum format validation in parser and base64 support.
checksum support for ldap sudoers
command to be run as the invoking user. This can be used in
conjunction with the Solaris Privilege Set support to grant privileges
without changing the user.
