ComputerCraft Archive

hmacsha256

computer utility Trinitek github

Description

Assorted mining and computer scripts for ComputerCraft/CCTweaked

Installation

Copy one of these commands into your ComputerCraft terminal:

wget:wget https://raw.githubusercontent.com/Trinitek/ComputerCraftScripts/master/scripts/libs/crypto/hmacsha256.lua hmacsha256
Archive:wget https://cc.shobie.xyz/cc/get/gh-Trinitek-ComputerCraftScripts-scripts-libs-crypto-hmacsha256 hmacsha256
Quick Install: wget https://cc.shobie.xyz/cc/get/gh-Trinitek-ComputerCraftScripts-scripts-libs-crypto-hmacsha256 hmacsha256

Usage

Run: hmacsha256

Tags

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Source

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Code Preview 


require("libs.crypto.sha256")

---@class HmacSha256
HmacSha256 = { }

---Computes the HMAC of the given data using the SHA256 algorithm.
---@param key immutableBytes
---@param data immutableBytes
---@return immutableBytes  -- 32-byte MAC
HmacSha256.hash = function(key, data)
    local blockSize = 64

    if #key > blockSize then key = Sha256.hash(key) end

    key = key .. string.rep("\0", blockSize - #key)

    local o_key_pad = { }
    local i_key_pad = { }

    for i = 1, blockSize do
        local k = key:byte(i)

        o_key_pad[i] = string.char(bit32.bxor(k, 0x5c))
        i_key_pad[i] = string.char(bit32.bxor(k, 0x36))
    end

    local o_key_pad_str = table.concat(o_key_pad)
    local i_key_pad_str = table.concat(i_key_pad)

    return Sha256.hash(o_key_pad_str .. Sha256.hash(i_key_pad_str .. data))
end

return HmacSha256