sha2 1.0.1 (new formula)

The world’s tiniest checksumming utility.(Probably. It’s 27KB when
compiled).

Handles SHA-256, SHA-384 and SHA-512. Ultra-portable. BSD licensed.
Generally a neat tiny tool that I’m fond of.

Closes Homebrew/legacy-homebrew#37243.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/sha2.rb

@@ -0,0 +1,20 @@
+class Sha2 < Formula
+  homepage "http://www.aarongifford.com/computers/sha.html"
+  url "http://www.aarongifford.com/computers/sha2-1.0.1.tgz"
+  sha1 "ffbc69e0b0ab47f70e61aeb14fa16ba2b74dc728"
+
+  option "without-check", "Skip compile-time tests"
+
+  def install
+    system ENV.cc, "-o", "sha2", "sha2prog.c", "sha2.c"
+    system "perl", "sha2test.pl" if build.with? "check"
+    bin.install "sha2"
+  end
+
+  test do
+    (testpath/"checkme.txt").write("homebrew")
+    output = pipe_output("#{bin}/sha2 -q -256 #{testpath}/checkme.txt")
+    expected = "12c87370d1b5472793e67682596b60efe2c6038d63d04134a1a88544509737b4"
+    assert output.include? expected
+  end
+end