package ixee.cryptopals.test

import com.ixee.IxeeSpec

class Set2Spec extends IxeeSpec {

  import ixee.cryptopals.utils.ConversionUtils._
  import ixee.cryptopals.utils.ByteUtils._
  import ixee.cryptopals.utils.StreamUtils._
  import ixee.cryptopals.utils._
  import ixee.cryptopals.solvers._

  "Set2" - {

    "Challenge 9: Implement PKCS#7 padding" - {

      "when n bytes are missing" - {

        "fill with n bytes of value n" in {

          val text = "what a nice stri" * 16 * 2

          def challenge9spec(expected: Byte) = {
            val truncated = text.dropRight(expected)
            val padString =
              CryptoUtils.pkcs7pad(truncated, 256).takeRight(expected)

            val expectedPad =
              s"${expected.toChar}" * expected

            padString mustBe expectedPad
          }

          for {
            x <- 1 to 255
          } yield challenge9spec(x.toByte)

        }

      }

    }

  }

}