pandect

pandect is a fast and easy-to-use Message Digest, Checksum and HMAC library for Clojure.

Usage

REPL

(require '[pandect.algo.sha1 :refer :all]
         '[clojure.java.io :as io])

(sha1 "Hello World!")           ;; => "2ef7bde608ce5404e97d5f042f95f89f1c232871"
(sha1-bytes "Hello World!")     ;; => #<byte[] [B@5293b95>
(sha1 (io/file "project.clj"))  ;; => "ff3b4565652aeb835edf2715b2a28586929ea4cc"
(sha1-file "project.clj")       ;; => "ff3b4565652aeb835edf2715b2a28586929ea4cc"
(sha1-file-bytes "project.clj") ;; => #<byte[] [B@e2606c7>

(sha1-hmac "Hello World!" "secret-key")       ;; => "399fc3d94f6df2213f92fcf2a8b6669279ef7d20"
(sha1-hmac-bytes "Hello World!" "secret-key") ;; => #<byte[] [B@602bd522>

You can tune stream processing using pandect.buffer/with-buffer-size (default is 2KB):

(require '[pandect.buffer :refer [with-buffer-size]])

(with-open [in (io/input-stream "shootout/data/1mb.txt")]
  (with-buffer-size (* 512 1024)
    (sha256 in)))

If you want to hash a String using a specific encoding, you should create the respective byte array manually:

(sha1 "Hällo World!")                          ;; => "f19c05a67c3d0f297b62e868657cf177913ce02a"
(sha1 (.getBytes "Hällo World!" "ISO-8859-1")) ;; => "cfe670bd6845020f5754b19a3c0eee602043eb89"

The namespace pandect.core contains all available algorithms but for better startup/compile times, using algorithm-specific ones is recommended.

Supported Algorithms

See the generated documentation for the available functions and their parameters.

Checksum	MDx	SHA	SHA-3	RIPEMD	Others
Adler32*	MD2*	SHA-1	SHA3-224	RIPEMD-128	SipHash-2-4⁺
CRC-32*	MD4	SHA-256	SHA3-256	RIPEMD-160	SipHash-4-8⁺
	MD5	SHA-384	SHA3-384	RIPEMD-256	Tiger192,3
		SHA-512	SHA3-512	RIPEMD-320	Whirlpool

* not available as MAC
⁺ only available as MAC

Benchmarks

You can run benchmarks on the following Message Digest implementations:

pandect (obviously)
clj-digest 1.4.3
clj-message-digest 1.0.0

Use the following command:

lein benchmark {pandect|clj-digest|clj-message-digest}\
               {--md2|--md5|--sha1|--sha256|--sha384|--sha512}\
               [--file <Path>]

If a file is supplied a benchmark will be run hashing its contents; if no file is given, the simple string "Hello, World!" will be hashed.

Benchmark Results

Benchmarks are run using Criterium on an Intel Core i7 2.7GHz/8GB RAM machine with Oracle JDK 1.7.0u67 (64-bit).

Results obtained using pandect 0.5.0.

Input: "Hello, World!"

Library	md2	md5	sha1	sha256	sha384	sha512	adler32	crc32
pandect	4.27µs	910ns	1.07µs	1.27µs	1.68µs	1.74µs	302ns	315ns
clj-digest	5.92µs	2.62µs	3.47µs	4.36µs	5.65µs	7.09µs	-	-
clj-message-digest	28.2µs	25µs	30.2µs	44.7µs	66.4µs	80.9µs	-	-

Input: 1KB file (times include I/O)

Library	md2	md5	sha1	sha256	sha384	sha512	adler32	crc32
pandect	122µs	13.7µs	14.9µs	17.9µs	16.5µs	16.3µs	9.19µs	9.12µs
clj-digest	128µs	19.1µs	20.5µs	24.8µs	25.1µs	26.1µs	-	-
clj-message-digest	259µs	149µs	155µs	160µs	203µs	221µs	-	-

Input: 1MB file (times include I/O)

Library	md2	md5	sha1	sha256	sha384	sha512	adler32	crc32
pandect	112ms	3.14ms	4.57ms	6.74ms	5.1ms	5.11ms	582µs	833µs
clj-digest	113ms	4.18ms	5.81ms	7.87ms	6.15ms	6.23ms	-	-
clj-message-digest	112ms	3.07ms	4.59ms	6.73ms	5.17ms	5.19ms	-	-

Contributors

Yannick Scherer (@xsc)
Toshiki Takeuchi (@totakke)
Jan Stępień (@jstepien)
Tom Crayford (@tcrayford)

License

The MIT License (MIT)

Copyright (c) 2014-2015 Yannick Scherer

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

rowhit / pandect