DES with Plan 9 Support

There are two parts to this: a Unix DES implementation, and some Plan 9 support for Unix that uses the DES implementation. The Plan 9 support gives you encrypt(2) and netkey(2). The only significant difference between this DES and the Plan 9 DES is that Plan 9 packs a DES key into 7 bytes, while this uses 8. In the Plan 9 support, there's a function (des9key) that does the key conversion (Plan 9 to 8 bytes). The versions of encrypt and decrypt should call des9key() before invoking deskey(), so it's transparent. The DES implementation has a Makefile, manual entry, and test program. The Plan 9 support comes with no Makefile support; that's up to you.

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