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45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
/*
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* Copyright (c) 2025, Altomani Gianluca <altomanigianluca@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCrypto/Hash/HKDF.h>
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#include <LibCrypto/OpenSSL.h>
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#include <openssl/core_names.h>
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#include <openssl/kdf.h>
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#include <openssl/params.h>
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namespace Crypto::Hash {
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HKDF::HKDF(HashKind hash_kind)
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: m_kdf(EVP_KDF_fetch(nullptr, "HKDF", nullptr))
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, m_hash_kind(hash_kind)
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{
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}
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ErrorOr<ByteBuffer> HKDF::derive_key(Optional<ReadonlyBytes> maybe_salt, ReadonlyBytes key, ReadonlyBytes info, u32 key_length_bytes)
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{
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auto hash_name = TRY(hash_kind_to_openssl_digest_name(m_hash_kind));
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auto ctx = TRY(OpenSSL_KDF_CTX::wrap(EVP_KDF_CTX_new(m_kdf)));
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OSSL_PARAM params[] = {
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OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, const_cast<char*>(hash_name.characters_without_null_termination()), hash_name.length()),
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OSSL_PARAM_octet_string(OSSL_KDF_PARAM_KEY, const_cast<u8*>(key.data()), key.size()),
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OSSL_PARAM_octet_string(OSSL_KDF_PARAM_INFO, const_cast<u8*>(info.data()), info.size()),
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OSSL_PARAM_END,
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OSSL_PARAM_END,
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};
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if (maybe_salt.has_value()) {
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params[3] = OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, const_cast<u8*>(maybe_salt->data()), maybe_salt->size());
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}
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auto buf = TRY(ByteBuffer::create_uninitialized(key_length_bytes));
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OPENSSL_TRY(EVP_KDF_derive(ctx.ptr(), buf.data(), key_length_bytes, params));
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return buf;
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}
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}
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