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OpenBSD DES require more than 70 kB of static memory. The GNU libcrypt DES, for information, require more than 131 kB, so this is probably the case with all non memory optimised DES. PolarSSL only required 132 bytes of stack with some kB of .rodata precomputed tables :-) I personally don't need MS CHAP v1 or MS CHAP v2, and that was not supported in the previous PPP port, so there is no regression, I feel comfortable about removing those hard to port stuff. If someone want to do the MS CHAP port, he first have to find or do a small memory footprint DES implementation.