1*6777b538SAndroid Build Coastguard Worker // Copyright 2012 The Chromium Authors 2*6777b538SAndroid Build Coastguard Worker // Use of this source code is governed by a BSD-style license that can be 3*6777b538SAndroid Build Coastguard Worker // found in the LICENSE file. 4*6777b538SAndroid Build Coastguard Worker 5*6777b538SAndroid Build Coastguard Worker #ifndef CRYPTO_SECURE_HASH_H_ 6*6777b538SAndroid Build Coastguard Worker #define CRYPTO_SECURE_HASH_H_ 7*6777b538SAndroid Build Coastguard Worker 8*6777b538SAndroid Build Coastguard Worker #include <stddef.h> 9*6777b538SAndroid Build Coastguard Worker 10*6777b538SAndroid Build Coastguard Worker #include <memory> 11*6777b538SAndroid Build Coastguard Worker 12*6777b538SAndroid Build Coastguard Worker #include "crypto/crypto_export.h" 13*6777b538SAndroid Build Coastguard Worker 14*6777b538SAndroid Build Coastguard Worker namespace crypto { 15*6777b538SAndroid Build Coastguard Worker 16*6777b538SAndroid Build Coastguard Worker // A wrapper to calculate secure hashes incrementally, allowing to 17*6777b538SAndroid Build Coastguard Worker // be used when the full input is not known in advance. The end result will the 18*6777b538SAndroid Build Coastguard Worker // same as if we have the full input in advance. 19*6777b538SAndroid Build Coastguard Worker class CRYPTO_EXPORT SecureHash { 20*6777b538SAndroid Build Coastguard Worker public: 21*6777b538SAndroid Build Coastguard Worker enum Algorithm { 22*6777b538SAndroid Build Coastguard Worker SHA256, 23*6777b538SAndroid Build Coastguard Worker SHA512, 24*6777b538SAndroid Build Coastguard Worker }; 25*6777b538SAndroid Build Coastguard Worker 26*6777b538SAndroid Build Coastguard Worker SecureHash(const SecureHash&) = delete; 27*6777b538SAndroid Build Coastguard Worker SecureHash& operator=(const SecureHash&) = delete; 28*6777b538SAndroid Build Coastguard Worker ~SecureHash()29*6777b538SAndroid Build Coastguard Worker virtual ~SecureHash() {} 30*6777b538SAndroid Build Coastguard Worker 31*6777b538SAndroid Build Coastguard Worker static std::unique_ptr<SecureHash> Create(Algorithm type); 32*6777b538SAndroid Build Coastguard Worker 33*6777b538SAndroid Build Coastguard Worker virtual void Update(const void* input, size_t len) = 0; 34*6777b538SAndroid Build Coastguard Worker virtual void Finish(void* output, size_t len) = 0; 35*6777b538SAndroid Build Coastguard Worker virtual size_t GetHashLength() const = 0; 36*6777b538SAndroid Build Coastguard Worker 37*6777b538SAndroid Build Coastguard Worker // Create a clone of this SecureHash. The returned clone and this both 38*6777b538SAndroid Build Coastguard Worker // represent the same hash state. But from this point on, calling 39*6777b538SAndroid Build Coastguard Worker // Update()/Finish() on either doesn't affect the state of the other. 40*6777b538SAndroid Build Coastguard Worker virtual std::unique_ptr<SecureHash> Clone() const = 0; 41*6777b538SAndroid Build Coastguard Worker 42*6777b538SAndroid Build Coastguard Worker protected: SecureHash()43*6777b538SAndroid Build Coastguard Worker SecureHash() {} 44*6777b538SAndroid Build Coastguard Worker }; 45*6777b538SAndroid Build Coastguard Worker 46*6777b538SAndroid Build Coastguard Worker } // namespace crypto 47*6777b538SAndroid Build Coastguard Worker 48*6777b538SAndroid Build Coastguard Worker #endif // CRYPTO_SECURE_HASH_H_ 49