LibreSSL 2.0.1

Closes Homebrew/homebrew#30817.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/libressl.rb

@@ -0,0 +1,44 @@
+require "formula"
+
+class Libressl < Formula
+  homepage "http://www.libressl.org/"
+  url "http://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.0.1.tar.gz"
+  mirror "http://mirrors.nycbug.org/pub/OpenBSD/LibreSSL/libressl-2.0.1.tar.gz"
+  sha256 "9596f6cb3e8bafe35d749dfbdb6c984f1bbd86233598eb5fdb4abf854a5792ba"
+
+  head do
+    url "https://github.com/libressl-portable/portable.git"
+    depends_on "automake" => :build
+    depends_on "autoconf" => :build
+    depends_on "libtool" => :build
+  end
+
+  keg_only "LibreSSL is not linked to prevent conflicts with the system OpenSSL."
+
+  def install
+    system "./autogen.sh" if build.head?
+
+    system "./configure", "--disable-dependency-tracking",
+                          "--disable-silent-rules",
+                          "--prefix=#{prefix}",
+                          "--with-openssldir=#{etc}/libressl",
+                          "--with-enginesdir=#{lib}/engines"
+
+    system "make"
+    system "make", "check"
+    system "make", "install"
+
+    mkdir_p "#{etc}/libressl"
+    touch "#{etc}/libressl/openssl.cnf"
+  end
+
+  test do
+    (testpath/"testfile.txt").write("This is a test file")
+    expected_checksum = "91b7b0b1e27bfbf7bc646946f35fa972c47c2d32"
+    system "#{bin}/openssl", "dgst", "-sha1", "-out", "checksum.txt", "testfile.txt"
+    open("checksum.txt") do |f|
+      checksum = f.read(100).split("=").last.strip
+      assert_equal checksum, expected_checksum
+    end
+  end
+end