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...instead of hard-coding it to 20. - This is consistent with the ChaCha implementation - NaCl and libsodium, that this API is designed to interop with, also support 8 and 12 round variants. The 12 round variant, in particular, provides the same security level as the 20 round variant, but is obviously faster. - scrypt currently uses its own non optimized version of Salsa, just because it use 8 rounds instead of 20. This will help remove code duplication. No behavior nor public API changes. The Salsa20 and XSalsa20 still represent the 20-round variant.