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/* SPDX-License-Identifier: BSL-1.0 OR BSD-3-Clause */
#ifndef MPT_CRYPTO_HASH_HPP
#define MPT_CRYPTO_HASH_HPP
#include "mpt/base/array.hpp"
#include "mpt/base/detect.hpp"
#include "mpt/base/memory.hpp"
#include "mpt/base/namespace.hpp"
#include "mpt/base/saturate_cast.hpp"
#include "mpt/crypto/exception.hpp"
#include <algorithm>
#include <vector>
#include <cassert>
#include <cstddef>
#if MPT_OS_WINDOWS
#include <windows.h> // must be before wincrypt.h for clang-cl
#include <bcrypt.h>
#endif // MPT_OS_WINDOWS
namespace mpt {
inline namespace MPT_INLINE_NS {
namespace crypto {
#if MPT_OS_WINDOWS
namespace hash {
struct hash_traits_md5 {
static constexpr std::size_t output_bits = 128;
static constexpr std::size_t output_bytes = output_bits / 8;
static constexpr const wchar_t * bcrypt_name = BCRYPT_MD5_ALGORITHM;
};
struct hash_traits_sha1 {
static constexpr std::size_t output_bits = 160;
static constexpr std::size_t output_bytes = output_bits / 8;
static constexpr const wchar_t * bcrypt_name = BCRYPT_SHA1_ALGORITHM;
};
struct hash_traits_sha256 {
static constexpr std::size_t output_bits = 256;
static constexpr std::size_t output_bytes = output_bits / 8;
static constexpr const wchar_t * bcrypt_name = BCRYPT_SHA256_ALGORITHM;
};
struct hash_traits_sha512 {
static constexpr std::size_t output_bits = 512;
static constexpr std::size_t output_bytes = output_bits / 8;
static constexpr const wchar_t * bcrypt_name = BCRYPT_SHA512_ALGORITHM;
};
template <typename Traits>
class hash_impl {
public:
using traits = Traits;
using result_type = std::array<std::byte, traits::output_bytes>;
private:
BCRYPT_ALG_HANDLE hAlg = NULL;
std::vector<BYTE> hashState;
std::vector<BYTE> hashResult;
BCRYPT_HASH_HANDLE hHash = NULL;
private:
void init() {
CheckNTSTATUS(BCryptOpenAlgorithmProvider(&hAlg, traits::bcrypt_name, NULL, 0), "BCryptOpenAlgorithmProvider");
if (!hAlg) {
throw exception(0);
}
DWORD hashStateSize = 0;
DWORD hashStateSizeSize = 0;
CheckNTSTATUS(BCryptGetProperty(hAlg, BCRYPT_OBJECT_LENGTH, (PBYTE)&hashStateSize, sizeof(DWORD), &hashStateSizeSize, 0), "BCryptGetProperty");
if (hashStateSizeSize != sizeof(DWORD)) {
throw exception(0);
}
if (hashStateSize <= 0) {
throw exception(0);
}
hashState.resize(hashStateSize);
DWORD hashResultSize = 0;
DWORD hashResultSizeSize = 0;
CheckNTSTATUS(BCryptGetProperty(hAlg, BCRYPT_HASH_LENGTH, (PBYTE)&hashResultSize, sizeof(DWORD), &hashResultSizeSize, 0), "BCryptGetProperty");
if (hashResultSizeSize != sizeof(DWORD)) {
throw exception(0);
}
if (hashResultSize <= 0) {
throw exception(0);
}
if (hashResultSize != mpt::extent<result_type>()) {
throw exception(0);
}
hashResult.resize(hashResultSize);
CheckNTSTATUS(BCryptCreateHash(hAlg, &hHash, hashState.data(), hashStateSize, NULL, 0, 0), "BCryptCreateHash");
if (!hHash) {
throw exception(0);
}
}
void cleanup() {
if (hHash) {
BCryptDestroyHash(hHash);
hHash = NULL;
}
hashResult.resize(0);
hashResult.shrink_to_fit();
hashState.resize(0);
hashState.shrink_to_fit();
if (hAlg) {
BCryptCloseAlgorithmProvider(hAlg, 0);
hAlg = NULL;
}
}
public:
hash_impl() {
try {
init();
} catch (...) {
cleanup();
throw;
}
}
hash_impl(const hash_impl &) = delete;
hash_impl & operator=(const hash_impl &) = delete;
~hash_impl() {
cleanup();
}
public:
hash_impl & process(mpt::const_byte_span data) {
CheckNTSTATUS(BCryptHashData(hHash, const_cast<UCHAR *>(mpt::byte_cast<const UCHAR *>(data.data())), mpt::saturate_cast<ULONG>(data.size()), 0), "BCryptHashData");
return *this;
}
result_type result() {
result_type res = mpt::init_array<std::byte, traits::output_bytes>(std::byte{0});
CheckNTSTATUS(BCryptFinishHash(hHash, hashResult.data(), mpt::saturate_cast<ULONG>(hashResult.size()), 0), "BCryptFinishHash");
assert(hashResult.size() == mpt::extent<result_type>());
std::transform(hashResult.begin(), hashResult.end(), res.begin(), [](BYTE b) { return mpt::as_byte(b); });
return res;
}
};
using MD5 = hash_impl<hash_traits_md5>;
using SHA1 = hash_impl<hash_traits_sha1>;
using SHA256 = hash_impl<hash_traits_sha256>;
using SHA512 = hash_impl<hash_traits_sha512>;
} // namespace hash
#endif // MPT_OS_WINDOWS
} // namespace crypto
} // namespace MPT_INLINE_NS
} // namespace mpt
#endif // MPT_CRYPTO_HASH_HPP
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