1 // Copyright (c) 2012 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_SECURE_HASH_H_ 6 #define CRYPTO_SECURE_HASH_H_ 7 8 #include <stddef.h> 9 10 #include <memory> 11 12 #include "base/macros.h" 13 #include "crypto/crypto_export.h" 14 15 namespace crypto { 16 17 // A wrapper to calculate secure hashes incrementally, allowing to 18 // be used when the full input is not known in advance. 19 class CRYPTO_EXPORT SecureHash { 20 public: 21 enum Algorithm { 22 SHA256, 23 }; 24 virtual ~SecureHash() {} 25 26 static std::unique_ptr<SecureHash> Create(Algorithm type); 27 28 virtual void Update(const void* input, size_t len) = 0; 29 virtual void Finish(void* output, size_t len) = 0; 30 virtual size_t GetHashLength() const = 0; 31 32 // Create a clone of this SecureHash. The returned clone and this both 33 // represent the same hash state. But from this point on, calling 34 // Update()/Finish() on either doesn't affect the state of the other. 35 virtual std::unique_ptr<SecureHash> Clone() const = 0; 36 37 protected: 38 SecureHash() {} 39 40 private: 41 DISALLOW_COPY_AND_ASSIGN(SecureHash); 42 }; 43 44 } // namespace crypto 45 46 #endif // CRYPTO_SECURE_HASH_H_ 47
