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01a7c888b4
Script that extracts EMV track 2 information Signed-off-by: Trigat <trigat@protonmail.com>
80 lines
2 KiB
Lua
80 lines
2 KiB
Lua
copyright = "Trigat"
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author = "Trigat"
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desc = "This script scans an EMV (credit or debit) card and extracts Track 2 information."
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local home = os.getenv("HOME")
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local json_file = home .. "/emv_output.json"
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core.console(string.format("emv scan -at %s", json_file))
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os.execute("sleep 1")
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-- Read JSON content
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local f = io.open(json_file, "r")
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if not f then
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print("[!!] Could not open JSON output")
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return
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end
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local content = f:read("*a")
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f:close()
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local track2 = nil
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local found = false
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-- Iterate over all "value" fields in JSON
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for value_field in content:gmatch('"value"%s*:%s*"(.-)"') do
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-- Look for 57 13 anywhere in the string
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track2 = value_field:match('57%s*13%s*([0-9A-Fa-f%s]+)')
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if track2 then
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-- Remove spaces to get clean hex
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track2 = track2:gsub("%s+", "")
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print("[++] Track 2 data found: 57 13 " .. track2 .. "\n")
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found = true
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break -- remove break if you want all occurrences
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end
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end
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if not found then
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print("[!!] Track 2 data not found in JSON")
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return
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end
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-- Remove 57 + Length prefix (first 4 hex digits = 57 13)
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track2 = track2:gsub("^57%x%x", "")
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-- Convert hex string into individual nibbles (1 hex digit each)
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local nibbles = {}
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for hex_digit in track2:gmatch("%x") do
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table.insert(nibbles, hex_digit)
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end
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-- Find 'D' separator
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local sep_index
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for i, nib in ipairs(nibbles) do
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if nib == "D" then
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sep_index = i
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break
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end
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end
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if not sep_index then
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print("[!!] Could not find 'D' separator in Track 2")
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return
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end
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-- Extract Primary Account Number (all nibbles before D)
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local pan = table.concat(nibbles, "", 1, sep_index-1)
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-- Expiry is next 4 nibbles after D
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local yy = nibbles[sep_index + 1] .. nibbles[sep_index + 2]
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local mm = nibbles[sep_index + 3] .. nibbles[sep_index + 4]
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-- Service code: next 3 nibbles
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local service = table.concat(nibbles, "", sep_index + 5, sep_index + 7) or "N/A"
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print("[++] PAN: " .. pan)
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print("[++] Expiry (MM/YY): " .. mm .. "/" .. yy)
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print("[++] Service code: " .. service)
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os.execute('rm -f ' .. json_file)
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