코틀린 파일 MD5 SHA1 SHA256 SHA512

	import java.io.File import java.io.FileInputStream
	import java.security.MessageDigest
	import javax.xml.bind.DatatypeConverter
	fun digest(file: File, engine: String) : String{
	val md = MessageDigest.getInstance(engine)
	FileInputStream(file).use { fi ->
	val bytes = ByteArray(4096)
	while (true) {
	val length = fi.read(bytes)
	if (length <= 0) {
	break
	}
	md.update(bytes, 0, length)
	}
	val byteData = md.digest()
	return DatatypeConverter.printHexBinary(byteData)
	}
	}
	fun getMD5(file: File) = digest(file,"MD5")
	fun getSHA1(file: File) = digest(file,"SHA1")
	fun getSHA256(file: File) = digest(file,"SHA-256")
	fun getSHA512(file: File) = digest(file,"SHA-512")
	fun main(args: Array<String>) {
	val file = File("test.txt")
	println(getMD5(file))
	println(getSHA1(file))
	println(getSHA256(file))
	println(getSHA512(file))
	}