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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/profile_resetter/jtl_foundation.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
namespace jtl_foundation {
Hasher::Hasher(const std::string& seed) : hmac_(crypto::HMAC::SHA256) {
if (!hmac_.Init(seed))
NOTREACHED();
}
Hasher::~Hasher() {}
std::string Hasher::GetHash(const std::string& input) const {
if (cached_hashes_.find(input) == cached_hashes_.end()) {
// Calculate value.
unsigned char digest[kHashSizeInBytes];
if (!hmac_.Sign(input, digest, arraysize(digest))) {
NOTREACHED();
return std::string();
}
// Instead of using the full SHA256, we only use the hex encoding of the
// first 16 bytes.
cached_hashes_[input] = base::HexEncode(digest, kHashSizeInBytes / 2);
DCHECK_EQ(kHashSizeInBytes, cached_hashes_[input].size());
}
return cached_hashes_[input];
}
// static
bool Hasher::IsHash(const std::string& maybe_hash) {
if (maybe_hash.size() != kHashSizeInBytes)
return false;
for (std::string::const_iterator it = maybe_hash.begin();
it != maybe_hash.end(); ++it) {
if (!IsHexDigit(*it))
return false;
}
return true;
}
} // namespace jtl_foundation
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