Grain-128 Stream Cipher in Go

This repository implements the Grain-128 stream cipher.

For more details on the Grain cipher, see A Stream Cipher Proposal: Grain-128.

Performance

goos: darwin, goarch: arm64, cpu: Apple M1 Pro

Benchmark	Iterations	Time per Op
Grain128Keystream	89,611	13,413 ns/op
Grain128Encrypt	86,306	13,317 ns/op
Grain128Decrypt	30,188	39,706 ns/op

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To run the benchmarks yourself, use the following command:

go test -bench=.