b2sum 20160619 (new formula)

Installs the reference implementation of the b2sum command line tool
from the official source repository. b2sum is a command line tool to
hash files using the BLAKE2 hash function.

Closes #2208.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>

Formula/b2sum.rb

@@ -0,0 +1,18 @@
+class B2sum < Formula
+  desc "BLAKE2 b2sum reference binary"
+  homepage "https://github.com/BLAKE2/BLAKE2"
+  url "https://github.com/BLAKE2/BLAKE2/archive/20160619.tar.gz"
+  sha256 "cbac833ccae56b5c6173dbeaf871aa99b32745cf7a994c7451d4533ecda55633"
+
+  def install
+    cd "b2sum" do
+      system "make", "NO_OPENMP=1"
+      system "make", "install", "PREFIX=#{prefix}", "MANDIR=#{man}"
+    end
+  end
+
+  test do
+    assert_equal "ba80a53f981c4d0d6a2797b69f12f6e94c212f14685ac4b74b12bb6fdbffa2d17d87c5392aab792dc252d5de4533cc9518d38aa8dbf1925ab92386edd4009923  -",
+                 pipe_output("#{bin}/b2sum -", "abc").chomp
+  end
+end