Add new constructor to HKDF that allows the client and server key/IV

crypto/hkdf.h

 // Copyright (c) 2013 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 CRYPTO_HKDF_H_
 #define CRYPTO_HKDF_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 22 matching lines @@
   // |iv_bytes_to_generate|: the number of bytes of IV to generate for both
   // client and server.
   // |subkey_secret_bytes_to_generate|: the number of bytes of subkey secret to
   // generate, shared between client and server.
   HKDF(const base::StringPiece& secret,
        const base::StringPiece& salt,
        const base::StringPiece& info,
        size_t key_bytes_to_generate,
        size_t iv_bytes_to_generate,
        size_t subkey_secret_bytes_to_generate);
+
+  // An alternative constructor that allows the client and server key/IV
+  // lengths to be different.
+  HKDF(const base::StringPiece& secret,
+       const base::StringPiece& salt,
+       const base::StringPiece& info,
+       size_t client_key_bytes_to_generate,
+       size_t server_key_bytes_to_generate,
+       size_t client_iv_bytes_to_generate,
+       size_t server_iv_bytes_to_generate,
+       size_t subkey_secret_bytes_to_generate);
   ~HKDF();
 
   base::StringPiece client_write_key() const {
     return client_write_key_;
   }
   base::StringPiece client_write_iv() const {
     return client_write_iv_;
   }
   base::StringPiece server_write_key() const {
     return server_write_key_;
@@ skipping 11 matching lines @@
   base::StringPiece client_write_key_;
   base::StringPiece server_write_key_;
   base::StringPiece client_write_iv_;
   base::StringPiece server_write_iv_;
   base::StringPiece subkey_secret_;
 };
 
 }  // namespace crypto
 
 #endif  // CRYPTO_HKDF_H_