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