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package ixee.cryptopals.utils.crypto
import javax.crypto.Cipher
class CBCCipher(cipher: Cipher, init: Seq[Byte]) {
var state: Seq[Byte] = init
var leftover: Seq[Byte] = Seq()
def enc(data: Seq[Byte]): Seq[Byte] = {
(blocks, leftover) = blockized(leftover append data)
blocks.map(encBlock).reduce(_ append _)
}
def encBlock(data: Seq[Byte]): Seq[Byte] = {
state = cipher.doFinal((data xor state).toArray)
state
}
def blockized(data: Seq[Byte])(size: Int): (Seq[Seq[Byte]], Seq[Byte]) =
data.splitAt(data.length - (data.length % size))
}
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