Module des 

DES and Triple-DES (TDEA) implemented from FIPS PUB 46-3.

All tables are transcribed verbatim from the FIPS 46-3 document (https://csrc.nist.gov/files/pubs/fips/46-3/final/docs/fips46-3.pdf). Tests use the official NIST CAVP Known Answer Test vectors downloaded directly from csrc.nist.gov/CSRC/media/Projects/Cryptographic-Algorithm- Validation-Program/documents/des/KAT_TDES.zip.

Des keeps the original fast byte-table and fused SP_TABLE software path. DesCt is a separate software-only path that replaces the secret indexed round function with loop-based permutations and packed ANF bitset evaluation of the DES S-boxes.

Structs

Des

A DES cipher keyed with a single 64-bit key (including parity bits).

DesCt

A software-only constant-time DES path.

TripleDes

A Triple-DES (TDEA) cipher.

Enums

DesKeyError

Error returned when a DES/TDEA constructor rejects key material.

TDesMode

Keying option for Triple-DES.

Functions

is_weak_or_semi_weak_key

Return true when key is weak or semi-weak under DES.

key_schedule

Generate the key schedule from a 64-bit key (including parity bits). Returns 16 subkeys, each 48 bits (stored in the low 48 bits of u64).

Type Aliases

KeySchedule

A 16-round DES key schedule: 16 × 48-bit subkeys.