diff --git a/7.txt b/7.txt
new file mode 100644
index 0000000..c02ff8a
--- /dev/null
+++ b/7.txt
@@ -0,0 +1,64 @@
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diff --git a/data/s2c10.txt b/data/s2c10.txt
new file mode 100644
index 0000000..f0802a5
--- /dev/null
+++ b/data/s2c10.txt
@@ -0,0 +1,64 @@
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diff --git a/project.clj b/project.clj
index b8c3fa7..9160f64 100644
--- a/project.clj
+++ b/project.clj
@@ -46,4 +46,5 @@ built, but you'll also understand how they're attacked.
"src/hale/cryptopals/set1/challenge8.clj"
"src/hale/cryptopals/set2.clj"
"src/hale/cryptopals/set2/challenge9.clj"
+ "src/hale/cryptopals/set2/challenge10.clj"
"src/hale/cryptopals/utils.clj"]})
diff --git a/solution.txt b/solution.txt
new file mode 100644
index 0000000..e69de29
diff --git a/src/hale/cryptopals/set1/challenge7.clj b/src/hale/cryptopals/set1/challenge7.clj
index 849572e..7eb9e8e 100644
--- a/src/hale/cryptopals/set1/challenge7.clj
+++ b/src/hale/cryptopals/set1/challenge7.clj
@@ -25,25 +25,29 @@
[javax.crypto.spec SecretKeySpec]))
-
(defn decrypt-aes-ecb
- [byte-stream key]
+ [key byte-stream]
(let [key-spec (SecretKeySpec. (.getBytes key) "AES")
- cipher (Cipher/getInstance "AES/ECB/PKCS5Padding")
+ cipher (Cipher/getInstance "AES/ECB/NoPadding")
_ (.init cipher (int Cipher/DECRYPT_MODE) key-spec)
+ _ (println (count byte-stream))
decrypted (.doFinal cipher (byte-array byte-stream))]
decrypted))
-(defn decrypt-aes-ecb-base64 [b64 key]
- (decrypt-aes-ecb (base64/base64-decode b64) key))
+(defn decrypt-aes-ecb-base64 [key b64]
+ (decrypt-aes-ecb key (base64/base64-decode b64)))
(def decrypt-aes-ecb-base64-to-str
"Decrypt AES in ECB mode"
(comp utils/bytes-to-str decrypt-aes-ecb-base64))
-(t/deftest decrypt-aes-in-ecb-mode
+;; TODO: why does this return ^D^D^D^D at the end? the same is NOT returned by openssl:
+;;
+;; openssl enc -d -a -aes-128-ecb -in 7.txt -v -K $(echo -n "YELLOW SUBMARINE" | hexdump -v -e '/1 "%02X"') -out 7.solution.txt
+;;
+(t/deftest test-decrypt-aes-ecb
(let [key "YELLOW SUBMARINE"
ciphertext (slurp "data/s1c7.txt")
plaintext (slurp "data/s1c7.solution.txt")]
- (t/is (= (decrypt-aes-ecb-base64-to-str ciphertext key) plaintext))))
+ (t/is (= plaintext (decrypt-aes-ecb-base64-to-str key ciphertext)))))
diff --git a/src/hale/cryptopals/set2/challenge10.clj b/src/hale/cryptopals/set2/challenge10.clj
new file mode 100644
index 0000000..446eeb4
--- /dev/null
+++ b/src/hale/cryptopals/set2/challenge10.clj
@@ -0,0 +1,81 @@
+;;
+;; # Implement CBC mode
+;;
+;; CBC mode is a block cipher mode that allows us to encrypt irregularly-sized
+;; messages, despite the fact that a block cipher natively only transforms
+;; individual blocks.
+;;
+;; In CBC mode, each ciphertext block is added to the next plaintext block
+;; before the next call to the cipher core.
+;;
+;; The first plaintext block, which has no associated previous ciphertext block,
+;; is added to a "fake 0th ciphertext block" called the initialization vector,
+;; or IV.
+;;
+;; Implement CBC mode by hand by taking the ECB function you wrote earlier,
+;; making it encrypt instead of decrypt (verify this by decrypting whatever you
+;; encrypt to test), and using your XOR function from the previous exercise to
+;; combine them.
+;;
+;; The file here is intelligible (somewhat) when CBC decrypted against "YELLOW
+;; SUBMARINE" with an IV of all ASCII 0 (\x00\x00\x00 &c)
+;;
+;;
+(ns hale.cryptopals.set2.challenge10
+ (:require [hale.cryptopals.utils :as utils]
+ [hale.cryptopals.set1.challenge1 :as base64]
+ [hale.cryptopals.set1.challenge7 :refer [decrypt-aes-ecb-base64-to-str]]
+ [clojure.test :as t])
+ (:import [javax.crypto Cipher]
+ [javax.crypto.spec SecretKeySpec]))
+
+
+
+(defn encrypt-aes-ecb
+ [key bs]
+ (let [key-spec (SecretKeySpec. (.getBytes key) "AES")
+ cipher (Cipher/getInstance "AES/ECB/NoPadding")
+ _ (.init cipher (int Cipher/ENCRYPT_MODE) key-spec)
+ encrypted (.doFinal cipher (byte-array bs))]
+ encrypted))
+
+(defn encrypt-aes-ecb-str-to-base64
+ [key str]
+ (->> str
+ utils/str-to-bytes
+ ((partial encrypt-aes-ecb key))
+ base64/base64-encode))
+
+;; (let [key "ICEICEBABY123456"
+;; plaintext "YELLOW SUBMARINE"
+;; encrypted (encrypt-aes-ecb-str-to-base64 key plaintext)
+;; _ (println encrypted)
+;; _ (println (count encrypted))
+;; decrypted (decrypt-aes-ecb-base64-to-str key encrypted)
+;; ])
+
+;; (decrypt-aes-ecb-base64-to-str encrypted key)
+
+(t/deftest encrypt-aes-in-ecb-mode
+ (let [key "YELLOW SUBMARINE"
+ ciphertext (slurp "data/s1c7.txt")
+ plaintext (slurp "data/s1c7.solution.txt")]
+ (t/is (= (encrypt-aes-ecb-str-to-base64 key plaintext) ciphertext))))
+
+
+
+;; I found this image on Wikipedia helpful for understanding how CBC encryption works:
+;;
+;; 
+;;
+;; So we need a function that takes an IV + plaintext and returns ciphertext.
+
+
+(defn encrypt-aes-ecb
+ "bs -- bytestream input plaintext
+ iv -- initialization vector
+ blocks -- number of bytes per block"
+ [bs iv blocks])
+
+
+(def input (base64/base64-decode (slurp "data/s2c10.txt")))