feat(cipher): add Grain-128 stream cipher (eSTREAM hardware profile finalist, NLFSR+LFSR combination, completes eSTREAM hardware coverage) - #993
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…inalist, NLFSR+LFSR combination, completes eSTREAM hardware coverage)
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Pull Request
Description
Adds a complete, step-instrumented visualizer for Grain-128, an eSTREAM hardware-profile finalist. This implementation demonstrates its coupled LFSR/NLFSR structure and distinctive initialization phase that feeds output back into both registers.
Related Issue
Closes #983
Type of Change
Changes Made
lib/cipher/symmetric/grain128.tswith BigInt register logic and feedback-during-inittests/unit/symmetric/grain128.test.tsverifying round-trip correctnessgrain128toCipherNameunion inlib/cipher/types.tsgrain128inlib/cipher/registry.tslib/workers/cipher.worker.tsTesting
Checklist
Additional Notes
Completes the eSTREAM hardware-profile pairing alongside the already-merged Trivium. Grain-128's LFSR+NLFSR structure is architecturally distinct from Trivium's three-NLFSR design.