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Command line Far:>lua:local sha=require'sha256' print(sha.hex("abc"))
result: 0000000000000000000000000000000000000000000000000000000000000000
this result returned for any input data, sha256.test.lua don't work.

This variant SHA-256 https://github.com/Egor-Skriptunoff/pure_lua_SHA work ok, like other SHA-256 algorithms.
lua:local sha=require'sha2' print(sha.sha256("abc"))
result: ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad

Is it possible to fix your sha256 code and make it as fast as possible for Far?

lmdb uses big endian ints on BE machines, so something should be done on that. If all goes right it should be just a > or < thing for unpack.

The module sha256.lua doesn't work correctly on 32-bit LuaJIT.

-- This program prints 3 different lines when run on LuaJIT for x86
-- On some systems, the first line contains correct value of hash,
-- but the second line is never correct.
local sha256 = require"sha256".hex
print(sha256("abc"))
print(sha256("abc"))
print(sha256("abc"))

Tested on Windows and Linux, on LuaJIT 2.0 and 2.1
always OK on LuaJIT x64,
wrong results on LuaJIT x86.

Another implementation of SHA256 for LuaJIT + FFI (https://stackoverflow.com/a/19988581/6834680) has the same problem.
Is this a LuaJIT bug?