Add back Util.hex2bin and .bin2hex

lib/rbnacl/util.rb

@@ -153,6 +153,24 @@ def verify16!(one, two)
       check_length(two, 16, "Second message")
       NaCl.crypto_verify_16(one, two)
     end
+
+    # Hex encodes a message
+    #
+    # @param [String] bytes The bytes to encode
+    #
+    # @return [String] Tasty, tasty hexadecimal
+    def bin2hex(bytes)
+      bytes.to_s.unpack("H*").first
+    end
+
+    # Hex decodes a message
+    #
+    # @param [String] hex hex to decode.
+    #
+    # @return [String] crisp and clean bytes
+    def hex2bin(hex)
+      [hex.to_s].pack("H*")
+    end
   end
 end
 

spec/rbnacl/util_spec.rb

@@ -102,6 +102,7 @@
       Crypto::Util.verify16(msg, long_msg).should be false
     end
   end
+
   context "check_length" do
     it "accepts strings of the correct length" do
       expect { Crypto::Util.check_length("A"*4, 4, "Test String") }.not_to raise_error
@@ -116,4 +117,17 @@
       expect { Crypto::Util.check_length(nil, 4, "Test String") }.to raise_error(Crypto::LengthError, "Test String was nil (Expected 4)")
     end
   end
+
+  context "hex encoding" do
+    let (:bytes) { [0xDE,0xAD,0xBE,0xEF].pack('c*') }
+    let (:hex)   { "deadbeef" }
+
+    it "encodes to hex with bin2hex" do
+      Crypto::Util.bin2hex(bytes).should eq hex
+    end
+
+    it "decodes from hex with hex2bin" do
+      Crypto::Util.hex2bin(hex).should eq bytes
+    end
+  end
 end