1 // Copyright 2019 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 UTIL_CRYPTO_SECURE_HASH_H_ 6 #define UTIL_CRYPTO_SECURE_HASH_H_ 7 8 #include <stddef.h> 9 10 #include <memory> 11 #include <string> 12 13 #include "openssl/base.h" 14 #include "openssl/evp.h" 15 #include "platform/base/macros.h" 16 17 namespace openscreen { 18 19 // A wrapper to calculate secure hashes incrementally, allowing to 20 // be used when the full input is not known in advance. The end result will the 21 // same as if we have the full input in advance. 22 class SecureHash { 23 public: 24 explicit SecureHash(const EVP_MD* type); 25 SecureHash(const SecureHash& other); 26 SecureHash(SecureHash&& other); 27 SecureHash& operator=(const SecureHash& other); 28 SecureHash& operator=(SecureHash&& other); 29 30 ~SecureHash(); 31 32 void Update(const uint8_t* input, size_t len); 33 void Finish(uint8_t* output); 34 35 // Handy versions that do the kludgy casting to unsigned in the background. 36 void Update(const std::string& input); 37 void Finish(char* output); 38 39 size_t GetHashLength() const; 40 41 private: 42 bssl::UniquePtr<EVP_MD_CTX> ctx_ = 43 bssl::UniquePtr<EVP_MD_CTX>(EVP_MD_CTX_new()); 44 }; 45 46 } // namespace openscreen 47 48 #endif // UTIL_CRYPTO_SECURE_HASH_H_ 49