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#include "merkletree/serial_hasher.h"
#include <openssl/sha.h>
#include <stddef.h>
using std::string;
using std::unique_ptr;
const size_t Sha256Hasher::kDigestSize = SHA256_DIGEST_LENGTH;
Sha256Hasher::Sha256Hasher() : initialized_(false) {
}
void Sha256Hasher::Reset() {
SHA256_Init(&ctx_);
initialized_ = true;
}
void Sha256Hasher::Update(const std::string& data) {
if (!initialized_)
Reset();
SHA256_Update(&ctx_, data.data(), data.size());
}
string Sha256Hasher::Final() {
if (!initialized_)
Reset();
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256_Final(hash, &ctx_);
initialized_ = false;
return string(reinterpret_cast<char*>(hash), SHA256_DIGEST_LENGTH);
}
unique_ptr<SerialHasher> Sha256Hasher::Create() const {
return unique_ptr<SerialHasher>(new Sha256Hasher);
}
// static
string Sha256Hasher::Sha256Digest(const string& data) {
Sha256Hasher hasher;
hasher.Reset();
hasher.Update(data);
return hasher.Final();
}
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