48 lines
1 KiB
Lua
48 lines
1 KiB
Lua
local fq = require "ccryptolib.internal.fq"
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local random = require "ccryptolib.random"
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local function new(val, order)
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local out = {}
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local sum = fq.num(0)
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for i = 1, order - 1 do
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out[i] = fq.decodeWide(random.random(64))
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sum = fq.add(sum, out[i])
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end
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out[order] = fq.add(val, fq.neg(sum))
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return out
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end
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local function encode(arr)
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local out = {}
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for i = 1, #arr do out[i] = fq.encode(arr[i]) end
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return table.concat(out)
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end
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local function decode(str)
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local out = {}
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for i = 1, #str / 32 do out[i] = fq.decode(str:sub(i * 32 - 31, i * 32)) end
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return out
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end
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local function remask(arr)
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local out = new(fq.num(0), #arr)
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for i = 1, #arr do out[i] = fq.add(out[i], arr[i]) end
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return out
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end
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local function reduce(arr, k)
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local out = fq.num(0)
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for i = 1, #arr do out = fq.add(out, fq.mul(arr[i], k)) end
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return out
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end
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return {
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new = new,
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encode = encode,
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decode = decode,
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remask = remask,
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reduce = reduce,
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}
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