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- // Copyright (c) 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 "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(base::StringPiece secret,
- base::StringPiece salt,
- base::StringPiece 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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