xlsxba

main.kt

import org.apache.poi.poifs.crypt.Decryptor
import org.apache.poi.poifs.crypt.EncryptionInfo
import org.apache.poi.poifs.filesystem.POIFSFileSystem
import java.io.FileInputStream
import java.math.BigInteger

fun main(args: Array<String>) {
    val inputStream = FileInputStream("/path/to/file.xlsx")
    val fileSystem = POIFSFileSystem(inputStream)
    val info = EncryptionInfo(fileSystem)
    val d = Decryptor.getInstance(info)


    var i: BigInteger = 0L.big
    while(!d.verifyPassword(i.to36)) {
        i = i.add(BigInteger.ONE)
        println("${i.to36} $i")
    }
    print("pass: ${i.to36}")
}

val Long.big: BigInteger
    get() = BigInteger.valueOf(this)

val BigInteger.to36: String
    get() = toString(36)