Chacha and Salsa are two different stream cyphers, from the same family
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toscalix commented
Background
As explained by Daniel J. Bernstein in this paper, ChaCha is a variant of Salsa20. Apparently (to be confirmed by an expert)
"ChaCha follows the same basic design principles as Salsa20, but I changed some of the details, most importantly to increase the amount of diffusion per round. "
Description
Salsa and Chacha should be considered different algorithms
scanoss-qg commented
I think we should rename Chacha. The algorithms were splitted in a previous version