Update specs for authenticators

This reflects both the use of the test vectors and makes sure that all
authenticator specs are green across the board.

spec/rbnacl/auth/hmac_sha256_spec.rb

@@ -1,13 +1,7 @@
 require 'spec_helper'
 
 describe Crypto::Auth::HmacSha256 do
-  # From RFC4231 (https://tools.ietf.org/html/rfc4231)
-  let(:key) { "Jefe" }
-  let(:message) { "what do ya want for nothing?" }
-  let(:tag) {
-    [0x5b,0xdc,0xc1,0x46,0xbf,0x60,0x75,0x4e,0x6a,0x04,0x24,0x26,0x08,0x95,0x75,0xc7,
-     0x5a,0x00,0x3f,0x08,0x9d,0x27,0x39,0x83,0x9d,0xec,0x58,0xb9,0x64,0xec,0x38,0x43].pack("c*")
-  }
+  let(:hex_tag) { Crypto::TestVectors[:auth_hmacsha256] }
 
   include_examples "authenticator"
 end

spec/rbnacl/auth/hmac_sha512256_spec.rb

@@ -1,13 +1,8 @@
 require 'spec_helper'
 
 describe Crypto::Auth::HmacSha512256 do
-  # From RFC4231 (https://tools.ietf.org/html/rfc4231)
-  let(:key) { "Jefe" }
-  let(:message) { "what do ya want for nothing?" }
-  let(:tag) {
-    [0x16,0x4b,0x7a,0x7b,0xfc,0xf8,0x19,0xe2,0xe3,0x95,0xfb,0xe7,0x3b,0x56,0xe0,0xa3,
-     0x87,0xbd,0x64,0x22,0x2e,0x83,0x1f,0xd6,0x10,0x27,0x0c,0xd7,0xea,0x25,0x05,0x54].pack("c*")
-  }
+  let(:hex_tag) { Crypto::TestVectors[:auth_hmacsha512256] }
+
 
   include_examples "authenticator"
 end

spec/rbnacl/auth/one_time_spec.rb

@@ -1,30 +1,7 @@
 require 'spec_helper'
 
 describe Crypto::Auth::OneTime do
-  let(:key) {
-    [0xee,0xa6,0xa7,0x25,0x1c,0x1e,0x72,0x91,0x6d,0x11,0xc2,0xcb,0x21,0x4d,0x3c,0x25,
-     0x25,0x39,0x12,0x1d,0x8e,0x23,0x4e,0x65,0x2d,0x65,0x1f,0xa4,0xc8,0xcf,0xf8,0x80].pack('c*')
-  }
-  let(:message) {
-    [0x8e,0x99,0x3b,0x9f,0x48,0x68,0x12,0x73,0xc2,0x96,0x50,0xba,0x32,0xfc,0x76,0xce,
-    0x48,0x33,0x2e,0xa7,0x16,0x4d,0x96,0xa4,0x47,0x6f,0xb8,0xc5,0x31,0xa1,0x18,0x6a,
-    0xc0,0xdf,0xc1,0x7c,0x98,0xdc,0xe8,0x7b,0x4d,0xa7,0xf0,0x11,0xec,0x48,0xc9,0x72,
-    0x71,0xd2,0xc2,0x0f,0x9b,0x92,0x8f,0xe2,0x27,0x0d,0x6f,0xb8,0x63,0xd5,0x17,0x38,
-    0xb4,0x8e,0xee,0xe3,0x14,0xa7,0xcc,0x8a,0xb9,0x32,0x16,0x45,0x48,0xe5,0x26,0xae,
-    0x90,0x22,0x43,0x68,0x51,0x7a,0xcf,0xea,0xbd,0x6b,0xb3,0x73,0x2b,0xc0,0xe9,0xda,
-    0x99,0x83,0x2b,0x61,0xca,0x01,0xb6,0xde,0x56,0x24,0x4a,0x9e,0x88,0xd5,0xf9,0xb3,
-    0x79,0x73,0xf6,0x22,0xa4,0x3d,0x14,0xa6,0x59,0x9b,0x1f,0x65,0x4c,0xb4,0x5a,0x74,
-    0xe3,0x55,0xa5].pack('c*')
-  }
-  let(:tag) {
-    [0xf3,0xff,0xc7,0x70,0x3f,0x94,0x00,0xe5,0x2a,0x7d,0xfb,0x4b,0x3d,0x33,0x05,0xd9].pack('c*')
-  }
+  let(:hex_tag) { Crypto::TestVectors[:auth_onetime] }
 
-  context ".new" do
-    it "raises on a key which is too short" do
-      expect { described_class.new(key[0, key.bytesize - 2])  }.to raise_error(ArgumentError)
-    end
-  end
-
   include_examples "authenticator"
 end

spec/shared/authenticator.rb

@@ -1,4 +1,9 @@
 shared_examples "authenticator" do
+  let (:hex_key) { Crypto::TestVectors[:auth_key] } 
+  let (:key)     { Crypto::Encoder[:hex].decode(hex_key) }
+  let (:message) { Crypto::Encoder[:hex].decode(Crypto::TestVectors[:auth_message]) }
+  let(:tag)      { Crypto::Encoder[:hex].decode(hex_tag)  }
+
   context ".new" do
     it "accepts a key" do
       expect { described_class.new(key)  }.to_not raise_error(ArgumentError)
@@ -62,15 +67,14 @@
 
   context "Instance methods" do
     let(:authenticator) { described_class.new(key) }
-    let(:hex) { Crypto::Encoder[:hex].encode(tag)  }
 
     context "#auth" do
       it "produces an authenticator" do
         authenticator.auth(message).should eq tag
       end
 
       it "produces a hex encoded authenticator" do
-        authenticator.auth(message, :hex).should eq hex
+        authenticator.auth(message, :hex).should eq hex_tag
       end
     end
 
@@ -92,16 +96,16 @@
 
       context "hex" do
         it "verifies an hexencoded authenticator" do
-          authenticator.verify(message, hex, :hex).should be true
+          authenticator.verify(message, hex_tag, :hex).should be true
         end
         it "fails to validate an invalid authenticator" do
-          authenticator.verify(message+"\0", hex , :hex).should be false
+          authenticator.verify(message+"\0", hex_tag , :hex).should be false
         end
         it "fails to validate a short authenticator" do
-          authenticator.verify( message, hex[0,hex.bytesize - 2], :hex).should be false
+          authenticator.verify( message, hex_tag[0,hex_tag.bytesize - 2], :hex).should be false
         end
         it "fails to validate a long authenticator" do
-          authenticator.verify(message, hex+"00", :hex).should be false
+          authenticator.verify(message, hex_tag+"00", :hex).should be false
         end
       end
     end