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by kragen 4255 days ago
NaCl includes portable C implementations of all its operations, but it's possible that they might not be constant-time on a given compiler. SUPERCOP now has ARM assembly implementations of the NaCl operations (contributed by Peter Schwabe), but they haven't been integrated into a NaCl release yet.

Schwabe has even written AVR versions of many of the NaCl operations, so maybe you can do your crypto not only on mobile but on an 8-bit microcontroller.