61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
// Copyright 2016 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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//
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// AES Decryptor implementation using openssl.
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#ifndef PACKAGER_MEDIA_BASE_AES_DECRYPTOR_H_
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#define PACKAGER_MEDIA_BASE_AES_DECRYPTOR_H_
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#include <vector>
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#include "packager/base/macros.h"
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#include "packager/media/base/aes_cryptor.h"
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#include "packager/media/base/aes_encryptor.h"
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namespace edash_packager {
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namespace media {
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/// For AES-CTR, encryption and decryption are identical.
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using AesCtrDecryptor = AesCtrEncryptor;
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/// Class which implements AES-CBC (Cipher block chaining) decryption.
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class AesCbcDecryptor : public AesCryptor {
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public:
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/// @param padding_scheme indicates the padding scheme used. Currently
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/// supported schemes: kNoPadding, kPkcs5Padding, kCtsPadding.
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/// @param chain_across_calls indicates whether there is a continuous cipher
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/// block chain across calls for Decrypt function. If it is false, iv
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/// is not updated across Decrypt function calls.
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AesCbcDecryptor(CbcPaddingScheme padding_scheme, bool chain_across_calls);
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~AesCbcDecryptor() override;
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/// @name AesCryptor implementation overrides.
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/// @{
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bool InitializeWithIv(const std::vector<uint8_t>& key,
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const std::vector<uint8_t>& iv) override;
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bool SetIv(const std::vector<uint8_t>& iv) override;
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void UpdateIv() override {
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// Nop for decryptor.
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}
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/// @}
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private:
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bool CryptInternal(const uint8_t* ciphertext,
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size_t ciphertext_size,
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uint8_t* plaintext,
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size_t* plaintext_size) override;
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const CbcPaddingScheme padding_scheme_;
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const bool chain_across_calls_;
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DISALLOW_COPY_AND_ASSIGN(AesCbcDecryptor);
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};
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} // namespace media
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} // namespace edash_packager
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#endif // PACKAGER_MEDIA_BASE_AES_DECRYPTOR_H_
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