package ixee.cryptopals.utils

import ixee.cryptopals.utils.crypto.CBCCipher
import javax.crypto.Cipher
import javax.crypto.spec.SecretKeySpec

object CryptoUtils {

  def pkcs7pad(s: String, blockSize: Int) = {
    val padLength = blockSize - (s.length % blockSize)
    s + s"${padLength.toChar}" * padLength
  }

  def cbcDecryptInstance(ecbCipher: Cipher, key: SecretKeySpec): CBCCipher = {
    ecbCipher.init(Cipher.DECRYPT_MODE, key)
    new CBCCipher(ecbCipher)
  }
}