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103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CRYPTO_ENCRYPTOR_H_
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#define CRYPTO_ENCRYPTOR_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <memory>
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#include <string>
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#include "base/strings/string_piece.h"
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#include "build/build_config.h"
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#include "crypto/crypto_export.h"
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namespace crypto {
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class SymmetricKey;
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class CRYPTO_EXPORT Encryptor {
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public:
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enum Mode {
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CBC,
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CTR,
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};
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// This class implements a 128-bits counter to be used in AES-CTR encryption.
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// Only 128-bits counter is supported in this class.
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class CRYPTO_EXPORT Counter {
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public:
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explicit Counter(const base::StringPiece& counter);
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~Counter();
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// Increment the counter value.
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bool Increment();
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// Write the content of the counter to |buf|. |buf| should have enough
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// space for |GetLengthInBytes()|.
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void Write(void* buf);
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// Return the length of this counter.
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size_t GetLengthInBytes() const;
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private:
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union {
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uint32_t components32[4];
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uint64_t components64[2];
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} counter_;
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};
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Encryptor();
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~Encryptor();
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// Initializes the encryptor using |key| and |iv|. Returns false if either the
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// key or the initialization vector cannot be used.
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//
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// If |mode| is CBC, |iv| must not be empty; if it is CTR, then |iv| must be
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// empty.
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bool Init(const SymmetricKey* key, Mode mode, const base::StringPiece& iv);
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// Encrypts |plaintext| into |ciphertext|. |plaintext| may only be empty if
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// the mode is CBC.
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bool Encrypt(const base::StringPiece& plaintext, std::string* ciphertext);
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// Decrypts |ciphertext| into |plaintext|. |ciphertext| must not be empty.
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//
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// WARNING: In CBC mode, Decrypt() returns false if it detects the padding
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// in the decrypted plaintext is wrong. Padding errors can result from
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// tampered ciphertext or a wrong decryption key. But successful decryption
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// does not imply the authenticity of the data. The caller of Decrypt()
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// must either authenticate the ciphertext before decrypting it, or take
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// care to not report decryption failure. Otherwise it could inadvertently
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// be used as a padding oracle to attack the cryptosystem.
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bool Decrypt(const base::StringPiece& ciphertext, std::string* plaintext);
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// Sets the counter value when in CTR mode. Currently only 128-bits
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// counter value is supported.
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//
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// Returns true only if update was successful.
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bool SetCounter(const base::StringPiece& counter);
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// TODO(albertb): Support streaming encryption.
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private:
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const SymmetricKey* key_;
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Mode mode_;
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std::unique_ptr<Counter> counter_;
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bool Crypt(bool do_encrypt, // Pass true to encrypt, false to decrypt.
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const base::StringPiece& input,
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std::string* output);
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bool CryptCTR(bool do_encrypt,
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const base::StringPiece& input,
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std::string* output);
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std::string iv_;
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};
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} // namespace crypto
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#endif // CRYPTO_ENCRYPTOR_H_
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