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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/hkdf.h"
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include "base/check.h"
#include "crypto/hmac.h"
#include "third_party/boringssl/src/include/openssl/digest.h"
#include "third_party/boringssl/src/include/openssl/hkdf.h"
namespace crypto {
std::string HkdfSha256(std::string_view secret,
std::string_view salt,
std::string_view info,
size_t derived_key_size) {
std::string key;
key.resize(derived_key_size);
int result = ::HKDF(
reinterpret_cast<uint8_t*>(&key[0]), derived_key_size, EVP_sha256(),
reinterpret_cast<const uint8_t*>(secret.data()), secret.size(),
reinterpret_cast<const uint8_t*>(salt.data()), salt.size(),
reinterpret_cast<const uint8_t*>(info.data()), info.size());
DCHECK(result);
return key;
}
std::vector<uint8_t> HkdfSha256(base::span<const uint8_t> secret,
base::span<const uint8_t> salt,
base::span<const uint8_t> info,
size_t derived_key_size) {
std::vector<uint8_t> ret;
ret.resize(derived_key_size);
int result =
::HKDF(ret.data(), derived_key_size, EVP_sha256(), secret.data(),
secret.size(), salt.data(), salt.size(), info.data(), info.size());
DCHECK(result);
return ret;
}
} // namespace crypto
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