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/*
* Copyright (c) 2020, Ali Mohammad Pur <mpfard@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Optional.h>
#include <AK/OwnPtr.h>
#include <AK/Variant.h>
#include <LibCrypto/Hash/HashFunction.h>
#include <LibCrypto/Hash/MD5.h>
#include <LibCrypto/Hash/SHA1.h>
#include <LibCrypto/Hash/SHA2.h>
namespace Crypto {
namespace Hash {
enum class HashKind {
None,
SHA1,
SHA256,
SHA384,
SHA512,
MD5,
};
struct MultiHashDigestVariant {
constexpr static size_t Size = 0;
MultiHashDigestVariant(Empty digest)
: m_digest(move(digest))
{
}
MultiHashDigestVariant(MD5::DigestType digest)
: m_digest(move(digest))
{
}
MultiHashDigestVariant(SHA1::DigestType digest)
: m_digest(move(digest))
{
}
MultiHashDigestVariant(SHA256::DigestType digest)
: m_digest(move(digest))
{
}
MultiHashDigestVariant(SHA384::DigestType digest)
: m_digest(move(digest))
{
}
MultiHashDigestVariant(SHA512::DigestType digest)
: m_digest(move(digest))
{
}
const u8* immutable_data() const
{
return m_digest.visit(
[&](const Empty&) -> const u8* { VERIFY_NOT_REACHED(); },
[&](const auto& value) { return value.immutable_data(); });
}
size_t data_length()
{
return m_digest.visit(
[&](const Empty&) -> size_t { VERIFY_NOT_REACHED(); },
[&](const auto& value) { return value.data_length(); });
}
using DigestVariant = Variant<Empty, MD5::DigestType, SHA1::DigestType, SHA256::DigestType, SHA384::DigestType, SHA512::DigestType>;
DigestVariant m_digest { Empty {} };
};
class Manager final : public HashFunction<0, MultiHashDigestVariant> {
public:
using HashFunction::update;
Manager()
{
m_pre_init_buffer = ByteBuffer::create_zeroed(0);
}
Manager(const Manager& other) // NOT a copy constructor!
{
m_pre_init_buffer = ByteBuffer::create_zeroed(0); // will not be used
initialize(other.m_kind);
}
Manager(HashKind kind)
{
m_pre_init_buffer = ByteBuffer::create_zeroed(0);
initialize(kind);
}
~Manager()
{
m_algorithm = Empty {};
}
inline size_t digest_size() const
{
return m_algorithm.visit(
[&](const Empty&) -> size_t { return 0; },
[&](const auto& hash) { return hash.digest_size(); });
}
inline size_t block_size() const
{
return m_algorithm.visit(
[&](const Empty&) -> size_t { return 0; },
[&](const auto& hash) { return hash.block_size(); });
}
inline void initialize(HashKind kind)
{
if (!m_algorithm.has<Empty>()) {
VERIFY_NOT_REACHED();
}
m_kind = kind;
switch (kind) {
case HashKind::MD5:
m_algorithm = MD5();
break;
case HashKind::SHA1:
m_algorithm = SHA1();
break;
case HashKind::SHA256:
m_algorithm = SHA256();
break;
case HashKind::SHA384:
m_algorithm = SHA384();
break;
case HashKind::SHA512:
m_algorithm = SHA512();
break;
default:
case HashKind::None:
m_algorithm = Empty {};
break;
}
}
virtual void update(const u8* data, size_t length) override
{
auto size = m_pre_init_buffer.size();
if (size) {
m_algorithm.visit(
[&](Empty&) {},
[&](auto& hash) { hash.update(m_pre_init_buffer); });
}
m_algorithm.visit(
[&](Empty&) { m_pre_init_buffer.append(data, length); },
[&](auto& hash) { hash.update(data, length); });
if (size && m_kind != HashKind::None)
m_pre_init_buffer.clear();
}
virtual DigestType peek() override
{
return m_algorithm.visit(
[&](Empty&) -> DigestType { VERIFY_NOT_REACHED(); },
[&](auto& hash) -> DigestType { return hash.peek(); });
}
virtual DigestType digest() override
{
auto digest = peek();
reset();
return digest;
}
virtual void reset() override
{
m_pre_init_buffer.clear();
m_algorithm.visit(
[&](Empty&) {},
[&](auto& hash) { hash.reset(); });
}
virtual String class_name() const override
{
return m_algorithm.visit(
[&](const Empty&) -> String { return "UninitializedHashManager"; },
[&](const auto& hash) { return hash.class_name(); });
}
inline bool is(HashKind kind) const
{
return m_kind == kind;
}
private:
using AlgorithmVariant = Variant<Empty, MD5, SHA1, SHA256, SHA384, SHA512>;
AlgorithmVariant m_algorithm { Empty {} };
HashKind m_kind { HashKind::None };
ByteBuffer m_pre_init_buffer;
};
}
}
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