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69 lines
1.4 KiB
C++
69 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/Authentication/HMAC.h>
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#include <openssl/core_names.h>
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#include <openssl/evp.h>
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namespace Crypto::Authentication {
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HMAC::HMAC(Hash::HashKind hash_kind, ReadonlyBytes key)
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: m_hash_kind(hash_kind)
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, m_key(key)
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, m_mac(EVP_MAC_fetch(nullptr, "HMAC", nullptr))
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{
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reset();
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}
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HMAC::~HMAC()
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{
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EVP_MAC_free(m_mac);
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EVP_MAC_CTX_free(m_ctx);
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}
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size_t HMAC::digest_size() const
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{
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return EVP_MAC_CTX_get_mac_size(m_ctx);
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}
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void HMAC::update(u8 const* message, size_t length)
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{
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if (EVP_MAC_update(m_ctx, message, length) != 1) {
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VERIFY_NOT_REACHED();
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}
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}
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ByteBuffer HMAC::digest()
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{
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auto buf = MUST(ByteBuffer::create_uninitialized(digest_size()));
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auto size = digest_size();
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if (EVP_MAC_final(m_ctx, buf.data(), &size, size) != 1) {
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VERIFY_NOT_REACHED();
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}
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return MUST(buf.slice(0, size));
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}
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void HMAC::reset()
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{
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EVP_MAC_CTX_free(m_ctx);
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m_ctx = EVP_MAC_CTX_new(m_mac);
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auto hash_name = MUST(hash_kind_to_openssl_digest_name(m_hash_kind));
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OSSL_PARAM params[] = {
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OSSL_PARAM_utf8_string(OSSL_MAC_PARAM_DIGEST, const_cast<char*>(hash_name.characters_without_null_termination()), hash_name.length()),
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OSSL_PARAM_END
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};
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if (EVP_MAC_init(m_ctx, m_key.data(), m_key.size(), params) != 1) {
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VERIFY_NOT_REACHED();
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}
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}
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}
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