XTEA implementation #422
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XTEA implementation #422
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This PR implements XTEA as described by various sources, including https://en.wikipedia.org/wiki/XTEA,
XTEA is a historical cipher, which is no longer commonly used today, but some legacy software still uses it to this day.
I tested that the cipher methods get properly unrolled, which boosts a 3x speed increase, and is one of the faster ciphers in this collection.
Partially solves #1
I decided against pre-computing keys as the computation is trivial, and doesn't have a noticeable impact on speed, probably because of memory accesses and that 256 byte don't fit easily in a cache line anyway.