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local rand = require 'openssl.rand'
local hmac = require 'openssl.hmac'
local function xor(a, b)
local x = {}
for i = 1, #b do
x[i] = string.char(a:byte(i) ~ b:byte(i))
end
return table.concat(x)
end
local function prf(algo, password, salt, iter)
local k
local prev = salt
for i = 1, iter do
local h = hmac.new(password, algo)
local sum = h:final(prev)
k = k and xor(k, sum) or sum
prev = sum
end
return k
end
return function(password, salt, algo, iter, blocks)
local salt = salt or rand.bytes(256)
local algo = algo or 'sha3-512'
local iter = iter or 10000
local blocks = blocks or 1
local dk = ""
for i = 1, blocks do
dk = dk .. prf(algo, password, salt..(('>I4'):pack(i)), iter)
end
return dk, salt, algo, iter, blocks
end
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