Use zero padding #204

Job	Run time
test python bindings	38s
test wasm bindings	1m 2s
cargo fmt	18s
cargo test (default)	48s
cargo test (default+wasm+elgamal3)	1m 4s
cargo test (default+legacy)	45s
cargo clippy (default+elgamal3)	23s
cargo test (default+wasm)	59s
cargo test (default+python+elgamal3)	1m 0s
cargo test (default+elgamal3)	48s
cargo clippy (default+legacy)	32s
cargo test (default+python)	1m 1s
cargo clippy (default+wasm+elgamal3)	31s
cargo clippy (default+python)	45s
cargo clippy (default+python+elgamal3)	35s
cargo clippy (default+wasm)	33s
cargo clippy (default)	23s
	12m 5s

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