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feat(core): FF1 format-preserving encryption (NIST SP 800-38G) - #17
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Backlog #9. Written from the NIST spec.
src/ff1.rs: FF1 with AES-128, AES-192 or AES-256, radix 2–65536, with alphabet-string helpers.FPE is deterministic and leaks length. Use a distinct tweak per column or tenant.
cargo testand clippy are clean.