package ixee.cryptopals.test

import com.ixee.IxeeSpec

class Set1Spec extends IxeeSpec {

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

  "Set1" - {

    "Challenge 1: converts from a hex string to base64" in {

      hexStr2Base64String(
        "49276d206b696c6c696e6720796f757220627261696e206c696b65206120706f69736f6e6f7573206d757368726f6f6d"
      ) mustBe(
        "SSdtIGtpbGxpbmcgeW91ciBicmFpbiBsaWtlIGEgcG9pc29ub3VzIG11c2hyb29t"
      )
    }

    "Challenge 2: xor's two equal-length buffers" in {

      val a = hexStr2Bytes(
        "1c0111001f010100061a024b53535009181c"
      )
      val b = hexStr2Bytes(
        "686974207468652062756c6c277320657965"
      )

      (a xor b).hex mustBe
        "746865206b696420646f6e277420706c6179"
    }

    "Challenge 3: single-byte xor cipher" in {
      XorDecrypt.findBestSingleByteKey(
        hexStr2Bytes(
          "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736"
        )
      ) mustBe 88.toByte
    }

    "Challenge 4: detecting single-byte xor" - {
      "Decrypts and reports the line of the single-byte xor" in {
        Challenge4.run("./data/4.txt") mustBe
          (("Now that the party is jumping\n", 170))
      }
    }

    "Challenge 5: repeating-key xor" in {
      val sourceText = """|Burning 'em, if you ain't quick and nimble
                          |I go crazy when I hear a cymbal""".stripMargin

      val key = "ICE"

      val ciphertext =
        sourceText.asBytes.to[Stream] xor key.asBytes.to[Stream].continually

      ciphertext.hex mustBe(
        Seq(
          "0b3637272a2b2e63622c2e69",
          "692a23693a2a3c6324202d62",
          "3d63343c2a26226324272765",
          "272a282b2f20430a652e2c65",
          "2a3124333a653e2b2027630c",
          "692b20283165286326302e27",
          "282f"
        ).mkString("")
      )
    }

    "Challenge 6: break repeating-key xor" - {

      "hamming distance should be computed correctly" in {

        val textA = "this is a test"
        val textB = "wokka wokka!!!"

        hammingDistance(textA, textB) mustBe 37

      }

      "prioritizes likely key sizes" in {

        val sourceText =
          """|the quick brown fox jumps over the lazy dog
             |This code is going to turn out to be surprisingly useful later on.
             |Breaking repeating-key XOR ("Vigenere") statistically is obviously
             | an academic exercise, a "Crypto 101" thing. But more people "know
             | how" to break it than can actually break it, and a similar
             | technique breaks something much more important.""".stripMargin.replace("\n", "")

        val key = "ICE IS REALLY NICE"

        val ciphertext = sourceText.asByteStream xor key.asByteStream.continually

        val expectedKeySize = XorDecrypt.inferKeySize(ciphertext)

        expectedKeySize mustBe key.length

      }

      "cracks multi-byte keys" in {
        val sourceText =
          """|the quick brown fox jumps over the lazy dog
             |This code is going to turn out to be surprisingly useful later on.
             |Breaking repeating-key XOR statistically is obviously
             | an academic exercise, a "Crypto 101" thing. But more people "know
             | how" to break it than can actually break it, and a similar
             | technique breaks something much more important.""".stripMargin.replace("\n", "")

        val key = "ICE IS REALLY NICE"

        val ciphertext = sourceText.asByteStream xor key.asByteStream.continually

        XorDecrypt.findBestMultiByteKey(ciphertext).take(key.length).asAscii mustBe key

        XorDecrypt.crackForMultiByteKey(ciphertext) mustBe sourceText
      }

      "cracks the challenge text" in {

        Challenge6.run mustBe Challenge6.expectation

      }
    }

    "Challenge 7: AES/ECB mode" in {

      Challenge7.run mustBe Challenge6.expectation

    }

    "Challenge 8: Detect ECB" in {

      Challenge8.run mustBe 133

    }
  }

}