Comments (3)
I have some seemingly working code for this, but it builds on the Rng PR with variants.rs
. Would you like me to try to adjust it for the current state of chacha20
or wait for the potential merge before opening a PR for it?
from stream-ciphers.
Let's try to land #333 first
from stream-ciphers.
I took another look at my 64-bit counter code, and it isn't working correctly on the NEON backend atm.
It uses a const bool in variants.rs
to determine which way the counter should be added in the backend, but if there's a better way to do this that doesn't involve modifying the backend code... it might be better. It is currently failing a test shortly after reaching the u32::MAX block pos.
The largest use-case for a 64-bit counter (that I can think of) is file system encryption for mobile devices. I've ran some benches, and chacha20
and even chacha20poly1305
is faster than AES on aarch64
. I've benched it on the cloud, on a compute EC2 instance. I would imagine that it's also faster on mobile devices. So... if the 64-bit counter only works for x86 and the software implementation, then there wouldn't really be a point if the main use case is on aarch64.
I will keep working on it a little, but I'd probably prefer a solution that doesn't need to modify the backends, if that's possible. Because the way it is now, every new backend would also need to have specific code for updating the counter
from stream-ciphers.
Related Issues (20)
- Please publish aes-ctr v0.5 to crates.io HOT 2
- request for rabbit cipher HOT 1
- ctr: block size vs counter size naming HOT 3
- XChaCha20 unnecessarily limits keystream to 256gb HOT 6
- Missing algorithms HOT 4
- Remove circular dependencies on `aes` crate HOT 1
- why chacha20 seek only works up to 2^37 while xchacha20 seek works up to 2^62? HOT 1
- out of range for slice of length 16 HOT 5
- chacha20: Add wide (4-block) AVX2 impl
- Port chacha20 SIMD backends
- Locking `zeroize` to `<=1.5` for `chacha` prevents compiling with `num-bigint-dig v0.8.1` (for `rsa 0.6.0-pre`) HOT 3
- version 0.9.0 does not compile on Arduino architecture HOT 1
- chacha20: SIGSEGV in CI HOT 8
- Publish `chacha20` crate which is available `neon` feature HOT 1
- Make the neon feature available for ChaCha20 HOT 3
- Does it allow to call decryption method explicitly? HOT 1
- Add more test vectors to salsa20 ? HOT 8
- `chacha20` is missing `.zeroize()` for the SIMD backends HOT 16
- No performance improvements with `-Ctarget-feature=+neon` on `arm64` HOT 6
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from stream-ciphers.