Forró is an ARX-based cipher, similar to Salsa and ChaCha, but with faster diffusion.
Ref: Latin Dances Reloaded: Improved Cryptanalysis Against Salsa and ChaCha, and the Proposal of Forró
This is an implementation for Zig.
Forró : ARX-based cipher with faster diffusion than ChaCha.
License: Other
Forró is an ARX-based cipher, similar to Salsa and ChaCha, but with faster diffusion.
Ref: Latin Dances Reloaded: Improved Cryptanalysis Against Salsa and ChaCha, and the Proposal of Forró
This is an implementation for Zig.
Forro rearranges the matrix and puts t_0 at word 4 and t_1 at word 5.
I believe I was the first person to implement HForró, and I noticed our implementations don't seem to be interoperable. I'm following the XChaCha draft/HSalsa20, which means the following indices:
mem.writeIntLittle(u32, out[0..4], x[6]);
mem.writeIntLittle(u32, out[4..8], x[7]);
mem.writeIntLittle(u32, out[8..12], x[14]);
mem.writeIntLittle(u32, out[12..16], x[15]);
mem.writeIntLittle(u32, out[16..20], x[4]);
mem.writeIntLittle(u32, out[20..24], x[5]);
mem.writeIntLittle(u32, out[24..28], x[12]);
mem.writeIntLittle(u32, out[28..32], x[13]);
x6/x7/x14/x15 are the constant, and x4/x5/x12/x13 are the nonce/input.
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