Trying to work through 12...

1 files changed, 39 insertions, 0 deletions

diff --git a/src/solvers/Challenge12.scala b/src/solvers/Challenge12.scala
new file mode 100644
index 0000000..b37b5e3
--- /dev/null
+++ b/src/solvers/Challenge12.scala
@@ -0,0 +1,39 @@
+package ixee.cryptopals.solvers
+
+import scala.io.Source
+import ixee.cryptopals.utils.ByteUtils._
+import ixee.cryptopals.utils.CryptoUtils._
+import ixee.cryptopals.utils.StreamUtils._
+import ixee.cryptopals.utils.ConversionUtils._
+import ixee.cryptopals.utils.FunctionUtils._
+import ixee.cryptopals.utils._
+import ixee.cryptopals.utils.crypto._
+import io.github.marklister.base64.Base64._
+
+object Challenge12 {
+  val path = "./data/10.txt"
+
+  lazy val mysteryText =
+    """|Um9sbGluJyBpbiBteSA1LjAKV2l0aCBteSByYWctdG9wIGRvd24gc28gbXkg
+       |aGFpciBjYW4gYmxvdwpUaGUgZ2lybGllcyBvbiBzdGFuZGJ5IHdhdmluZyBq
+       |dXN0IHRvIHNheSBoaQpEaWQgeW91IHN0b3A/IE5vLCBJIGp1c3QgZHJvdmUg
+       |YnkK""".stripMargin.replace("\n", "").toByteArray
+
+  val key = """|Copy your oracle function to a new function that
+               | encrypts buffers under ECB mode using a consistent
+               | but unknown key (for instance, assign a single
+               | random key, once, to a global variable).""".stripMargin
+            .replace("\n", "")
+            .asBytes
+            .grouped(16)
+            .toSeq
+            .init
+            .reduce(_ xor _)
+
+  def encryptFn(input: Seq[Byte]): Seq[Byte] =
+    SchemeBuilder("AES", key).ecb.encrypt.end(input ++ mysteryText)
+
+  def run = {
+    CryptoUtils.extractUnknownViaEcbOracle(encryptFn _)
+  }
+}