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XTS mode is fully known as "xor-encrypt-xor with ciphertext-stealing". This is the generalization of the XEX mode. This implementation is limited to an 8-bits (1 byte) boundary, which doesn't seem to be what was thought considering some test vectors [1]. This commit comes with tests, extracted from [1], and benchmarks. Although, benchmarks aren't really nice here, as they work with a buffer of a multiple of 16 bytes, which isn't a challenge for XTS compared to XEX. [1] http://csrc.nist.gov/groups/STM/cavp/documents/aes/XTSTestVectors.zip