For bbox it's not acceptable. Roll our own des and md5 crypt implementation. Against older uclibc: text data bss dec hex filename 759945 604 6684 767233 bb501 busybox_old 759766 604 6684 767054 bb44e busybox_unstripped so, we still save on code size.
Please see the LICENSE file for copyright information (GPLv2) libbb is BusyBox's utility library. All of this stuff used to be stuffed into a single file named utility.c. When I split utility.c to create libbb, some of the very oldest stuff ended up without their original copyright and licensing information (which is now lost in the mists of time). If you see something that you wrote that is mis-attributed, do let me know so we can fix that up. Erik Andersen <andersen@codepoet.org>