Refactor checksumming

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

1 files changed, 7 insertions, 0 deletions

diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index 907679f99..5edd8b664 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -301,6 +301,13 @@ class Pathname
     require 'digest/sha2'
     incremental_hash(Digest::SHA2)
   end
+  alias_method :sha256, :sha2
+
+  def verify_checksum expected
+    raise ChecksumMissingError if expected.nil? or expected.empty?
+    actual = Checksum.new(expected.hash_type, send(expected.hash_type).downcase)
+    raise ChecksumMismatchError.new(expected, actual) unless expected == actual
+  end
 
   if '1.9' <= RUBY_VERSION
     alias_method :to_str, :to_s