From 3ecbc420cd792340937f595297640895ad5edecb Mon Sep 17 00:00:00 2001
From: Peter Taoussanis <ptaoussanis@gmail.com>
Date: Tue, 11 Jun 2013 12:54:04 +0700
Subject: [PATCH] Add basic crypto support (alpha)

---
 README.md                         |  10 +--
 benchmarks/chart.png              | Bin 0 -> 16818 bytes
 benchmarks/chart1.png             | Bin 13998 -> 0 bytes
 benchmarks/chart2.png             | Bin 9909 -> 0 bytes
 project.clj                       |   2 +-
 src/taoensso/nippy.clj            |  23 ++++--
 src/taoensso/nippy/benchmarks.clj | 101 +++++++++++++++--------
 src/taoensso/nippy/crypto.clj     | 131 ++++++++++++++++++++++++++++++
 src/taoensso/nippy/utils.clj      |  30 ++++++-
 test/test_nippy/main.clj          |   7 +-
 10 files changed, 251 insertions(+), 53 deletions(-)
 create mode 100644 benchmarks/chart.png
 delete mode 100644 benchmarks/chart1.png
 delete mode 100644 benchmarks/chart2.png
 create mode 100644 src/taoensso/nippy/crypto.clj

diff --git a/README.md b/README.md
index 04a6584..e74ffa2 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 Current [semantic](http://semver.org/) version:
 
 ```clojure
-[com.taoensso/nippy "1.2.1"]
+[com.taoensso/nippy "1.2.1"]        ; Stable
+[com.taoensso/nippy "1.3.0-alpha1"] ; Development (adds crypto support)
 ```
 
 # Nippy, a Clojure serialization library
@@ -17,6 +18,7 @@ Nippy is an attempt to provide a drop-in, high-performance alternative to the re
   * **Reader-fallback** for difficult/future types (including Clojure 1.4+ tagged literals).
   * **Full test coverage** for every supported type.
   * [Snappy](http://code.google.com/p/snappy/) **integrated de/compression** for efficient storage and network transfer.
+  * Enable **high-strength encryption** with a single option. (1.3.0+)
 
 ## Getting started
 
@@ -102,9 +104,7 @@ Couldn't be simpler!
 
 ## Performance
 
-![Performance comparison chart](https://github.com/ptaoussanis/nippy/raw/master/benchmarks/chart1.png)
-
-![Data size chart](https://github.com/ptaoussanis/nippy/raw/master/benchmarks/chart2.png)
+![Comparison chart](https://github.com/ptaoussanis/nippy/raw/master/benchmarks/chart.png)
 
 [Detailed benchmark information](https://docs.google.com/spreadsheet/ccc?key=0AuSXb68FH4uhdE5kTTlocGZKSXppWG9sRzA5Y2pMVkE&pli=1#gid=0) is available on Google Docs.
 
@@ -127,4 +127,4 @@ Otherwise reach me (Peter Taoussanis) at [taoensso.com](https://www.taoensso.com
 
 ## License
 
-Copyright &copy; 2012, 2013 Peter Taoussanis. Distributed under the [Eclipse Public License](http://www.eclipse.org/legal/epl-v10.html), the same as Clojure.
+Copyright &copy; 2012, 2013 Peter Taoussanis. Distributed under the [Eclipse Public License](http://www.eclipse.org/legal/epl-v10.html), the same as Clojure.
\ No newline at end of file
diff --git a/benchmarks/chart.png b/benchmarks/chart.png
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diff --git a/project.clj b/project.clj
index 04227de..12f82bb 100644
--- a/project.clj
+++ b/project.clj
@@ -1,4 +1,4 @@
-(defproject com.taoensso/nippy "1.2.1"
+(defproject com.taoensso/nippy "1.3.0-alpha1"
   :description "Clojure serialization library"
   :url "https://github.com/ptaoussanis/nippy"
   :license {:name "Eclipse Public License"
diff --git a/src/taoensso/nippy.clj b/src/taoensso/nippy.clj
index 0817e23..6df0e03 100644
--- a/src/taoensso/nippy.clj
+++ b/src/taoensso/nippy.clj
@@ -2,7 +2,8 @@
   "Simple, high-performance Clojure serialization library. Adapted from
   Deep-Freeze."
   {:author "Peter Taoussanis"}
-  (:require [taoensso.nippy.utils :as utils])
+  (:require [taoensso.nippy.utils  :as utils]
+            [taoensso.nippy.crypto :as crypto])
   (:import  [java.io DataInputStream DataOutputStream ByteArrayOutputStream
              ByteArrayInputStream]
             [clojure.lang Keyword BigInt Ratio PersistentQueue PersistentTreeMap
@@ -166,14 +167,17 @@
 
 (defn freeze-to-bytes
   "Serializes x to a byte array and returns the array."
-  ^bytes [x & {:keys [compress?  print-dup?]
-               :or   {compress?  true
+  ^bytes [x & {:keys [crypto compress? print-dup? salt password]
+               :or   {crypto     crypto/crypto-default
+                      compress?  true
                       print-dup? true}}]
   (let [ba     (ByteArrayOutputStream.)
         stream (DataOutputStream. ba)]
     (freeze-to-stream! stream x print-dup?)
-    (let [ba (.toByteArray ba)]
-      (if compress? (utils/compress-bytes ba) ba))))
+    (let [ba (.toByteArray ba)
+          ba (if compress? (utils/compress-bytes ba) ba)
+          ba (if password  (crypto/encrypt crypto salt password ba) ba)]
+      ba)))
 
 ;;;; Thawing
 
@@ -251,10 +255,13 @@
 
 (defn thaw-from-bytes
   "Deserializes an object from given byte array."
-  [ba & {:keys [read-eval? compressed?]
-         :or   {read-eval?  false ; For `read-string` injection safety - NB!!!
+  [ba & {:keys [crypto compressed? read-eval? salt password]
+         :or   {crypto      crypto/crypto-default
+                read-eval?  false ; For `read-string` injection safety - NB!!!
                 compressed? true}}]
-  (-> (if compressed? (utils/uncompress-bytes ba) ba)
+  (-> (let [ba (if password    (crypto/decrypt crypto salt password ba) ba)
+            ba (if compressed? (utils/uncompress-bytes ba) ba)]
+        ba)
       (ByteArrayInputStream.)
       (DataInputStream.)
       (thaw-from-stream! read-eval?)))
diff --git a/src/taoensso/nippy/benchmarks.clj b/src/taoensso/nippy/benchmarks.clj
index ea538f4..03f9c2e 100644
--- a/src/taoensso/nippy/benchmarks.clj
+++ b/src/taoensso/nippy/benchmarks.clj
@@ -1,7 +1,8 @@
 (ns taoensso.nippy.benchmarks
   {:author "Peter Taoussanis"}
   (:use     [taoensso.nippy :as nippy :only (freeze-to-bytes thaw-from-bytes)])
-  (:require [taoensso.nippy.utils :as utils]))
+  (:require [taoensso.nippy.utils  :as utils]
+            [taoensso.nippy.crypto :as crypto]))
 
 ;; Remove stuff from stress-data that breaks reader
 (def data (dissoc nippy/stress-data :queue :queue-empty :bytes))
@@ -10,52 +11,80 @@
 
 (defn reader-freeze [x] (binding [*print-dup* false] (pr-str x)))
 (defn reader-thaw   [x] (binding [*read-eval* false] (read-string x)))
+(def  reader-roundtrip (comp reader-thaw reader-freeze))
 
-(def roundtrip        (comp thaw-from-bytes freeze-to-bytes))
-(def reader-roundtrip (comp reader-thaw reader-freeze))
+(def crypto-opts [:password "secret" :crypto crypto/crypto-default-cached])
 
-(defn autobench [] (bench (roundtrip data)))
+(def roundtrip-defaults  (comp nippy/thaw-from-bytes nippy/freeze-to-bytes))
+(def roundtrip-encrypted (comp #(apply nippy/thaw-from-bytes % crypto-opts)
+                               #(apply nippy/freeze-to-bytes % crypto-opts)))
+(def roundtrip-fast      (comp #(nippy/thaw-from-bytes % :compressed? false)
+                               #(nippy/freeze-to-bytes % :compress?   false)))
+
+(defn autobench [] (bench (roundtrip-defaults  data)
+                          (roundtrip-encrypted data)))
 
 (comment
 
-  ;;; Times
-  (println
-   "---\n"
-   {:reader {:freeze (bench (reader-freeze data))
-             :thaw   (let [frozen (reader-freeze data)]
-                       (bench (reader-thaw frozen)))
-             :round  (bench (reader-roundtrip data))}
+  (do ; Roundtrip times
+    (println "Benching (this can take some time)...")
+    (println "-------------------------------------")
 
-    :nippy  {:freeze (bench (freeze-to-bytes data))
-             :thaw   (let [frozen (freeze-to-bytes data)]
-                       (bench (thaw-from-bytes frozen)))
-             :round  (bench (roundtrip data))}})
+    (println
+     {:reader
+      {:freeze (bench (reader-freeze data))
+       :thaw   (let [frozen (reader-freeze data)]
+                 (bench (reader-thaw frozen)))
+       :round  (bench (reader-roundtrip data))
+       :data-size (count (.getBytes ^String (reader-freeze data) "UTF-8"))}})
 
-  ;; Clojure 1.3.0, Nippy 0.9.2
-  ;; {:reader {:freeze 28505, :thaw 36451, :round 59545},
-  ;;  :nippy  {:freeze 3751,  :thaw 4184,  :round 7769}}
-  ;; (float (/ 59545 7769)) = 7.6644354
+    (println
+     {:defaults
+      {:freeze (bench (freeze-to-bytes data))
+       :thaw   (let [frozen (freeze-to-bytes data)]
+                 (bench (thaw-from-bytes frozen)))
+       :round  (bench (roundtrip-defaults data))
+       :data-size (count (freeze-to-bytes data))}})
 
-  ;; Clojure 1.4.0, Nippy 1.0.0 (+ tagged-uuid, tagged-date)
-  ;; {:reader {:freeze 22595, :thaw 31148, :round 54059}
-  ;;  :nippy  {:freeze 3324,  :thaw 3725,  :round 6918}}
-  ;; (float (/ 54059 6918)) = 7.814253
+    (println
+     {:encrypted
+      {:freeze (bench (apply freeze-to-bytes data crypto-opts))
+       :thaw   (let [frozen (apply freeze-to-bytes data crypto-opts)]
+                 (bench (apply thaw-from-bytes frozen crypto-opts)))
+       :round  (bench (roundtrip-encrypted data))
+       :data-size (count (apply freeze-to-bytes data crypto-opts))}})
 
-  ;; Clojure 1.5.1, Nippy 1.2.1 (+ sorted-set, sorted-map)
+    (println
+     {:fast
+      {:freeze (bench (freeze-to-bytes data :compress? false))
+       :thaw   (let [frozen (freeze-to-bytes data :compress? false)]
+                 (bench (thaw-from-bytes frozen :compressed? false)))
+       :round  (bench (roundtrip-fast data))
+       :data-size (count (freeze-to-bytes data :compress? false))}})
+
+    (println "Done! (Time for cake?)"))
+
+  ;;; 11 June 2013: Clojure 1.5.1, Nippy 1.3.0-alpha1
+  ;; {:reader    {:freeze 17042, :thaw 31579, :round 48379, :data-size 22954}}
+  ;; {:defaults  {:freeze 3810,  :thaw 5295,  :round 9052,  :data-size 12394}}
+  ;; {:encrypted {:freeze 5800,  :thaw 6862,  :round 12317, :data-size 12416}}
+  ;; {:fast      {:freeze 3078,  :thaw 4684,  :round 8117,  :data-size 13274}}
+
+  ;;; Clojure 1.5.1, Nippy 1.2.1 (+ sorted-set, sorted-map)
   ;; (def data (dissoc data :sorted-set :sorted-map))
   ;; {:reader {:freeze 15037, :thaw 27885, :round 43945},
   ;;  :nippy  {:freeze 3194,  :thaw 4734,  :round 8380}}
-  ;; (float (/ 43945 8380)) = 5.2440333
+  ;; {:reader-size 22975, :defaults-size 12400, :encrypted-size 12400}
 
-;;; Data size
-   (let [frozen (reader-freeze data)]   (count (.getBytes frozen "UTF8")))
-   (let [frozen (freeze-to-bytes data)] (count frozen))
-   ;; 22955, 12402
-   ;; (float (/ 22955 12402)) = 1.8509111
+  ;;; Clojure 1.4.0, Nippy 1.0.0 (+ tagged-uuid, tagged-date)
+  ;; {:reader {:freeze 22595, :thaw 31148, :round 54059}
+  ;;  :nippy  {:freeze 3324,  :thaw 3725,  :round 6918}}
 
-;;; Snappy implementations
-   (println (bench (roundtrip data)))
-   ;;                No Snappy: 6163 6064 6042 6176
-   ;;               Snappy JNI: 6489 6446 6542 6412
-   ;; Snappy native array copy: 6569 6419 6414 6590
-   )
\ No newline at end of file
+  ;;; Clojure 1.3.0, Nippy 0.9.2
+  ;; {:reader {:freeze 28505, :thaw 36451, :round 59545},
+  ;;  :nippy  {:freeze 3751,  :thaw 4184,  :round 7769}}
+
+  (println (bench (roundtrip data))) ; Snappy implementations
+  ;; {:no-snappy [6163 6064 6042 6176] :JNI [6489 6446 6542 6412]
+  ;;  :native-array-copy [6569 6419 6414 6590]}
+  )
\ No newline at end of file
diff --git a/src/taoensso/nippy/crypto.clj b/src/taoensso/nippy/crypto.clj
new file mode 100644
index 0000000..70606d8
--- /dev/null
+++ b/src/taoensso/nippy/crypto.clj
@@ -0,0 +1,131 @@
+(ns taoensso.nippy.crypto
+  "Alpha - subject to change.
+  Simple no-nonsense crypto with reasonable defaults. Because your Clojure data
+  deserves some privacy."
+  {:author "Peter Taoussanis"}
+  (:require [taoensso.nippy.utils :as utils]))
+
+(defprotocol ICrypto "Simple cryptography interface."
+  (gen-key ^javax.crypto.spec.SecretKeySpec [crypto salt pwd]
+    "Returns an appropriate SecretKeySpec.")
+  (encrypt ^bytes [crypto salt pwd ba] "Returns encrypted bytes.")
+  (decrypt ^bytes [crypto salt pwd ba] "Returns decrypted bytes."))
+
+(defrecord CryptoAES [cipher-type default-salt key-gen-opts cache])
+
+(def ^:private ^java.security.MessageDigest sha-md
+  (java.security.MessageDigest/getInstance "SHA-512"))
+
+(def ^:private ^:const aes128-block-size (int 16))
+
+(defn- sha512-key
+  "Default SHA512-based key generator. Good JVM availability without extra
+  dependencies (PBKDF2, bcrypt, scrypt, etc.). Decent security with multiple
+  rounds. VERY aggressive multiples (>64) possible+recommended when cached."
+  [^String salted-pwd & [{:keys [rounds-multiple]
+                          :or   {rounds-multiple 5}}]] ; Cacheable
+  (loop [^bytes ba (.getBytes salted-pwd "UTF-8")
+         n (* (int Short/MAX_VALUE) (or rounds-multiple 5))]
+    (if-not (zero? n)
+      (recur (.digest sha-md ba) (dec n))
+      (-> ba
+          ;; 128bit keys have good JVM availability and are
+          ;; entirely sufficient, Ref. http://goo.gl/2YRQG
+          (java.util.Arrays/copyOf aes128-block-size)
+          (javax.crypto.spec.SecretKeySpec. "AES")))))
+
+(comment
+  (time (sha512-key "hi" {:rounds-multiple 1}))   ; ~40ms per hash (fast)
+  (time (sha512-key "hi" {:rounds-multiple 5}))   ; ~180ms  (default)
+  (time (sha512-key "hi" {:rounds-multiple 32}))  ; ~1200ms (conservative)
+  (time (sha512-key "hi" {:rounds-multiple 128})) ; ~4500ms (paranoid)
+  )
+
+(def ^:private cipher* (memoize #(javax.crypto.Cipher/getInstance %)))
+(defn- cipher ^javax.crypto.Cipher [cipher-type] (cipher* cipher-type))
+
+(def ^:private ^java.security.SecureRandom rand-gen
+  (java.security.SecureRandom/getInstance "SHA1PRNG"))
+(defn- rand-bytes [size] (let [seed (make-array Byte/TYPE size)]
+                           (.nextBytes rand-gen seed) seed))
+
+(extend-type CryptoAES
+  ICrypto
+  (gen-key [{:keys [default-salt key-gen-opts cache]} salt pwd]
+    (utils/apply-memoized cache
+     sha512-key (str (or salt default-salt) pwd) key-gen-opts))
+
+  (encrypt [{:keys [cipher-type cache] :as crypto} salt pwd ba]
+    (let [cipher (cipher cipher-type)
+          key    (gen-key crypto salt pwd)
+          iv-ba  (rand-bytes aes128-block-size)
+          iv     (javax.crypto.spec.IvParameterSpec. iv-ba)]
+      (.init cipher javax.crypto.Cipher/ENCRYPT_MODE key iv)
+      (.doFinal cipher (utils/ba-concat iv-ba ba))))
+
+  (decrypt [{:keys [cipher-type cache] :as crypto} salt pwd ba]
+    (let [cipher (cipher cipher-type)
+          key    (gen-key crypto salt pwd)
+          [iv-ba data-ba] (utils/ba-split ba aes128-block-size)
+          iv     (javax.crypto.spec.IvParameterSpec. iv-ba)]
+      (.init cipher javax.crypto.Cipher/DECRYPT_MODE key iv)
+      (.doFinal cipher data-ba))))
+
+(defn crypto-aes128
+  "Returns a new CryptoAES object with options:
+    :default-salt    - Shared fallback password salt when none is provided. If
+                       the use case allows it, a unique random salt per
+                       encrypted item is better.
+    :cache-keys?     - IMPORTANT. DO enable this if and ONLY if your use case
+                       involves only a small, finite number of unique secret
+                       keys (salt+password)s. Dramatically improves `gen-key`
+                       performance in those cases and (as a result) allows for
+                       a *much* stronger `key-work-factor`.
+    :key-work-factor - O(n) CPU time needed to generate keys. Larger factors
+                       provide more protection against brute-force attacks but
+                       make encryption+decryption slower if `:cache-keys?` is
+                       not enabled.
+
+                       Some sensible values (from fast to strong):
+                         Without caching: 1, 5,  10
+                            With caching: 5, 32, 64, 128
+
+  See also `crypto-default` and `crypto-default-cached` for sensible ready-made
+  CryptoAES objects."
+  [& [{:keys [default-salt cache-keys? key-work-factor]
+       :or   {default-salt "XA~I3(:]3'ck5!M[z\\m`l^0mltR~y/]Arq_d9+$`e#yJssN^8"
+              key-work-factor 5}}]]
+  (CryptoAES. "AES/CBC/PKCS5Padding"
+              default-salt
+              {:rounds-multiple (int key-work-factor)}
+              (when cache-keys? (atom {}))))
+
+(def crypto-default        (crypto-aes128))
+(def crypto-default-cached (crypto-aes128 {:cache-keys?     true
+                                           :key-work-factor 64}))
+
+(comment
+  (time (gen-key crypto-default        "my-salt" "my-password"))
+  (time (gen-key crypto-default-cached "my-salt" "my-password"))
+  (time (->> (.getBytes "Secret message" "UTF-8")
+             (encrypt crypto-default "s" "p")
+             (encrypt crypto-default "s" "p")
+             (decrypt crypto-default "s" "p")
+             (decrypt crypto-default "s" "p")
+             (String.))))
+
+;; TODO Nippy: Compress _then_ encode.  Decode _then_ decompress.
+;; TODO Move tests to actual unit tests ns.
+;; TODO Update benchmarks with crypto (so 3 bars).
+;; TODO Add tests for bad decryption (e.g. wrong key)
+;; ;; (comment
+;; ;;   (let [data (dissoc nippy/stress-data :bytes)]
+;; ;;     (= data (->> data
+;; ;;                  (nippy/freeze-to-bytes)
+;; ;;                  (encrypt-aes "my-password")
+;; ;;                  (decrypt-aes "my-password")
+;; ;;                  (nippy/thaw-from-bytes))))
+
+;; ;;   (let [ba (nippy/freeze-to-bytes nippy/stress-data)]
+;; ;;     (time (dotimes [_ 10000] (->> ba (encrypt-aes "my-password")
+;; ;;                                      (decrypt-aes "my-password"))))))
\ No newline at end of file
diff --git a/src/taoensso/nippy/utils.clj b/src/taoensso/nippy/utils.clj
index 30488e1..e3d90ff 100644
--- a/src/taoensso/nippy/utils.clj
+++ b/src/taoensso/nippy/utils.clj
@@ -59,4 +59,32 @@
        (catch Exception _ false)))
 
 (defn compress-bytes   [^bytes ba] (Snappy/compress   ba))
-(defn uncompress-bytes [^bytes ba] (Snappy/uncompress ba 0 (alength ba)))
\ No newline at end of file
+(defn uncompress-bytes [^bytes ba] (Snappy/uncompress ba 0 (alength ba)))
+
+(defn apply-memoized
+  "A cross between `memoize` and `apply`. Operates like `apply` but accepts an
+  optional {<args> <value> ...} cache atom."
+  [cache f & args]
+  (if-not cache
+    (apply f args)
+    (if-let [dv (@cache args)]
+      @dv
+      (let [dv (delay (apply f args))]
+        (swap! cache assoc args dv)
+        @dv))))
+
+(defn ba-concat ^bytes [^bytes ba1 ^bytes ba2]
+  (let [s1  (alength ba1)
+        s2  (alength ba2)
+        out (byte-array (+ s1 s2))]
+    (System/arraycopy ba1 0 out 0  s1)
+    (System/arraycopy ba2 0 out s1 s2)
+    out))
+
+(defn ba-split [^bytes ba ^Integer idx]
+  [(java.util.Arrays/copyOfRange ba 0 idx)
+   (java.util.Arrays/copyOfRange ba idx (alength ba))])
+
+(comment (String. (ba-concat (.getBytes "foo") (.getBytes "bar")))
+         (let [[x y] (ba-split (.getBytes "foobar") 3)]
+           [(String. x) (String. y)]))
\ No newline at end of file
diff --git a/test/test_nippy/main.clj b/test/test_nippy/main.clj
index 185bd68..7a7eb59 100644
--- a/test/test_nippy/main.clj
+++ b/test/test_nippy/main.clj
@@ -6,9 +6,12 @@
 ;; Remove stuff from stress-data that breaks roundtrip equality
 (def test-data (dissoc nippy/stress-data :bytes))
 
-(def roundtrip (comp nippy/thaw-from-bytes nippy/freeze-to-bytes))
+(def roundtrip-defaults  (comp nippy/thaw-from-bytes nippy/freeze-to-bytes))
+(def roundtrip-encrypted (comp #(nippy/thaw-from-bytes % :password "secret")
+                               #(nippy/freeze-to-bytes % :password "secret")))
 
-(deftest test-roundtrip (is (= test-data (roundtrip test-data))))
+(deftest test-roundtrip-defaults  (is (= test-data (roundtrip-defaults  test-data))))
+(deftest test-roundtrip-encrypted (is (= test-data (roundtrip-encrypted test-data))))
 
 (println "Benchmarking roundtrips (x3)")
 (println "----------------------------")