Add parsers for the Encryption and Encryption-Key HTTP headers.

components/gcm_driver/crypto/encryption_header_parsers.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 COMPONENTS_GCM_DRIVER_CRYPTO_ENCRYPTION_HEADER_PARSERS_H_
+#define COMPONENTS_GCM_DRIVER_CRYPTO_ENCRYPTION_HEADER_PARSERS_H_
+
+#include <stdint.h>
+#include <string>
+
+namespace gcm {
+
+// Parses |input| following the syntax of the Encryption HTTP header. Chrome
+// only supports a single set of properties to be read from the header at this
+// time. The base64url encoded salt will be decoded, the rs will be validated.
+//
+// https://tools.ietf.org/html/draft-thomson-http-encryption-01#section-3
+//
+// Returns whether the |input| was successfully be parsed, and the resulting
+// information was stored in |keyid|, |salt| and |rs|. The output arguments will
+// not be changed unless parsing was successful.
+bool ParseEncryptionHeader(const std::string& input,
+                           std::string* keyid,
+                           std::string* salt,
+                           int64_t* rs);

[eroman, 2015/09/25 18:18:19]

uint64_t, since |rs| must be non-negative (in fact needs to be > 1)

[Peter Beverloo, 2015/09/28 11:27:15]

Done.

+
+// Parses |input| following the syntax of the Encryption-Key HTTP header. Chrome
+// only supports a single set of properties to be read from the header at this
+// time. The base64url encoded key and dh will be decoded.
+//
+// https://tools.ietf.org/html/draft-thomson-http-encryption-01#section-4
+//
+// Returns whether |input| was successfully parsed, and the resulting
+// information was stored in |keyid|, |key| and |dh|. The output arguments will
+// not be changed unless parsing was successful.
+bool ParseEncryptionKeyHeader(const std::string& input,
+                              std::string* keyid,
+                              std::string* key,
+                              std::string* dh);
+
+}  // namespace gcm
+
+#endif  // COMPONENTS_GCM_DRIVER_CRYPTO_ENCRYPTION_HEADER_PARSERS_H_