crypto/aead_openssl.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CRYPTO_AEAD_H_
   6 #define CRYPTO_AEAD_H_
   7
   8 #include "base/strings/string_piece.h"
   9 #include "crypto/crypto_export.h"
  10
  11 struct evp_aead_st;
  12
  13 namespace crypto {
  14
  15 // This class exposes the AES-128-CTR-HMAC-SHA256 AEAD, currently only
  16 // for OpenSSL builds.
  17 class CRYPTO_EXPORT Aead {
  18  public:
  19   enum AeadAlgorithm { AES_128_CTR_HMAC_SHA256 };
  20
  21   explicit Aead(AeadAlgorithm algorithm);
  22
  23   ~Aead();
  24
  25   void Init(const std::string* key);
  26
  27   bool Seal(const base::StringPiece& plaintext,
  28             const base::StringPiece& nonce,
  29             const base::StringPiece& additional_data,
  30             std::string* ciphertext) const;
  31
  32   bool Open(const base::StringPiece& ciphertext,
  33             const base::StringPiece& nonce,
  34             const base::StringPiece& additional_data,
  35             std::string* plaintext) const;
  36
  37   size_t KeyLength() const;
  38
  39   size_t NonceLength() const;
  40
  41  private:
  42   const std::string* key_;
  43   const evp_aead_st* aead_;
  44 };
  45
  46 }  // namespace crypto
  47
  48 #endif  // CRYPTO_ENCRYPTOR_H_