Add DER parsing of AlgorithmId for signatures.

net/der/input.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_DER_INPUT_H_
 #define NET_DER_INPUT_H_
 
 #include <stdint.h>
 #include <string>
 
@@ skipping 37 matching lines @@
 
   // Creates an Input from the given |data| and |len|.
   Input(const uint8_t* data, size_t len);
 
   // Returns the length in bytes of an Input's data.
   size_t Length() const { return len_; }
 
   // Return true if the Input's data and |other|'s data are byte-wise equal.
   bool Equals(const Input& other) const;
 
+  // Return true if the Input's data and |data| are byte-wise equal.
+  template <size_t N>
+  bool Equals(const uint8_t(&data)[N]) const {
+    return Equals(Input(data));

[Ryan Sleevi, 2015/06/29 14:45:24]

So, this isn't ideal because it double-instantiates templates. You could do
Equals(Input(data, size)) to avoid the double instantiation, or simply leave it
to the caller to do Equals(Input(kTestData))

Either of those are more preferable than Equals(Input(Data)) in here.

[eroman, 2015/06/29 15:19:00]

Removed.

+  }
+
   // Returns a pointer to the Input's data. This method is marked as "unsafe"
   // because access to the Input's data should be done through ByteReader
   // instead. This method should only be used where using a ByteReader truly
   // is not an option.
   const uint8_t* UnsafeData() const { return data_; }
 
  private:
   const uint8_t* data_;
   size_t len_;
 };
@@ skipping 80 matching lines @@
   explicit Mark(const uint8_t* ptr);
   Mark();
   const uint8_t* ptr_;
 };
 
 }  // namespace der
 
 }  // namespace net
 
 #endif  // NET_DER_INPUT_H_