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#ifndef CERT_TRANS_MERKLETREE_SERIAL_HASHER_H_
#define CERT_TRANS_MERKLETREE_SERIAL_HASHER_H_
#include <openssl/sha.h>
#include <stddef.h>
#include <memory>
#include <string>
#include "base/macros.h"
class SerialHasher {
public:
SerialHasher() = default;
virtual ~SerialHasher() = default;
virtual size_t DigestSize() const = 0;
// Reset the context. Must be called before the first Update() call.
// Optionally it can be called after each Final() call; however
// doing so is a no-op since Final() will leave the hasher in a
// reset state.
virtual void Reset() = 0;
// Update the hash context with (binary) data.
virtual void Update(const std::string& data) = 0;
// Finalize the hash context and return the binary digest blob.
virtual std::string Final() = 0;
// A virtual constructor, creates a new instance of the same type.
virtual std::unique_ptr<SerialHasher> Create() const = 0;
private:
DISALLOW_COPY_AND_ASSIGN(SerialHasher);
};
class Sha256Hasher : public SerialHasher {
public:
Sha256Hasher();
size_t DigestSize() const {
return kDigestSize;
}
void Reset();
void Update(const std::string& data);
std::string Final();
std::unique_ptr<SerialHasher> Create() const;
// Create a new hasher and call Reset(), Update(), and Final().
static std::string Sha256Digest(const std::string& data);
private:
SHA256_CTX ctx_;
bool initialized_;
static const size_t kDigestSize;
DISALLOW_COPY_AND_ASSIGN(Sha256Hasher);
};
#endif // CERT_TRANS_MERKLETREE_SERIAL_HASHER_H_
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