lib/zip_crypto_win.c - third_party/libzip - Git at Google

 /*
   zip_crypto_win.c -- Windows Crypto API wrapper.
   Copyright (C) 2018 Dieter Baron and Thomas Klausner

   This file is part of libzip, a library to manipulate ZIP archives.
   The authors can be contacted at <libzip@nih.at>

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:
   1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in
   the documentation and/or other materials provided with the
   distribution.
   3. The names of the authors may not be used to endorse or promote
   products derived from this software without specific prior
   written permission.

   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 #include <stdlib.h>

 #include "zipint.h"
 #include "zip_crypto.h"

 #define WIN32_LEAN_AND_MEAN
 #define NOCRYPT

 #include <Windows.h>
 #include <bcrypt.h>

 #pragma comment(lib, "bcrypt.lib")

 /*

 This code is using the Cryptography API: Next Generation (CNG)
 https://docs.microsoft.com/en-us/windows/desktop/seccng/cng-portal

 This API is supported on
  - Windows Vista or later (client OS)
  - Windows Server 2008 (server OS)
  - Windows Embedded Compact 2013 (don't know about Windows Embedded Compact 7)

 The code was developed for Windows Embedded Compact 2013 (WEC2013),
 but should be working for all of the above mentioned OSes.

 There are 2 restrictions for WEC2013, Windows Vista and Windows Server 2008:

 1.) The function "BCryptDeriveKeyPBKDF2" is not available

 I found some code which is implementing this function using the deprecated Crypto API here:
 https://www.idrix.fr/Root/content/view/37/54/

 I took this code and converted it to the newer CNG API. The original code was more
 flexible, but this is not needed here so i refactored it a bit and just kept what is needed.

 The define "HAS_BCRYPTDERIVEKEYPBKDF2" controls whether "BCryptDeriveKeyPBKDF2"
 of the CNG API is used or not. This define must not be set if you are compiling for WEC2013 or Windows Vista.


 2.) "BCryptCreateHash" can't manage the memory needed for the hash object internally

 On Windows 7 or later it is possible to pass NULL for the hash object buffer.
 This is not supported on WEC2013, so we have to handle the memory allocation/deallocation ourselves.
 There is no #ifdef to control that, because this is working for all supported OSes.

 */

 #if !defined(WINCE) && !defined(__MINGW32__)
 #define HAS_BCRYPTDERIVEKEYPBKDF2
 #endif

 #ifdef HAS_BCRYPTDERIVEKEYPBKDF2

 bool _zip_crypto_pbkdf2(const zip_uint8_t *key, zip_uint64_t key_length, const zip_uint8_t *salt, zip_uint16_t salt_length, zip_uint16_t iterations, zip_uint8_t* output, zip_uint16_t output_length)
 {
 	BCRYPT_ALG_HANDLE hAlgorithm = NULL;

 	if (!BCRYPT_SUCCESS(BCryptOpenAlgorithmProvider(&hAlgorithm, BCRYPT_SHA1_ALGORITHM, NULL, BCRYPT_ALG_HANDLE_HMAC_FLAG)))
 	{
 		return false;
 	}

 	bool result = BCRYPT_SUCCESS(BCryptDeriveKeyPBKDF2(hAlgorithm, (PUCHAR)key, (ULONG)key_length, (PUCHAR)salt, salt_length, iterations, output, output_length, 0));

 	BCryptCloseAlgorithmProvider(hAlgorithm, 0);

 	return result;
 }

 #else

 #include <math.h>

 #define DIGEST_SIZE 20
 #define BLOCK_SIZE 64

 typedef struct
 {
 	BCRYPT_ALG_HANDLE hAlgorithm;
 	BCRYPT_HASH_HANDLE hInnerHash;
 	BCRYPT_HASH_HANDLE hOuterHash;
 	ULONG cbHashObject;
 	PUCHAR pbInnerHash;
 	PUCHAR pbOuterHash;
 } PRF_CTX;

 static void hmacFree(PRF_CTX* pContext)
 {
 	if (pContext->hOuterHash) BCryptDestroyHash(pContext->hOuterHash);
 	if (pContext->hInnerHash) BCryptDestroyHash(pContext->hInnerHash);
 	free(pContext->pbOuterHash);
 	free(pContext->pbInnerHash);
 	if (pContext->hAlgorithm) BCryptCloseAlgorithmProvider(pContext->hAlgorithm, 0);
 }

 static BOOL hmacPrecomputeDigest(BCRYPT_HASH_HANDLE hHash, PUCHAR pbPassword, DWORD cbPassword, BYTE mask)
 {
 	BYTE buffer[BLOCK_SIZE];
 	DWORD i;

 	if (cbPassword > BLOCK_SIZE)
 	{
 		return FALSE;
 	}

 	memset(buffer, mask, sizeof(buffer));

 	for (i = 0; i < cbPassword; ++i)
 	{
 		buffer[i] = (char)(pbPassword[i] ^ mask);
 	}

 	return BCRYPT_SUCCESS(BCryptHashData(hHash, buffer, sizeof(buffer), 0));
 }

 static BOOL hmacInit(PRF_CTX* pContext, PUCHAR pbPassword, DWORD cbPassword)
 {
 	BOOL bStatus = FALSE;
 	ULONG cbResult;
 	BYTE key[DIGEST_SIZE];

 	if (!BCRYPT_SUCCESS(BCryptOpenAlgorithmProvider(&pContext->hAlgorithm, BCRYPT_SHA1_ALGORITHM, NULL, 0)) ||
 		!BCRYPT_SUCCESS(BCryptGetProperty(pContext->hAlgorithm, BCRYPT_OBJECT_LENGTH, (PUCHAR)&pContext->cbHashObject, sizeof(pContext->cbHashObject), &cbResult, 0)) ||
 		((pContext->pbInnerHash = malloc(pContext->cbHashObject)) == NULL) ||
 		((pContext->pbOuterHash = malloc(pContext->cbHashObject)) == NULL) ||
 		!BCRYPT_SUCCESS(BCryptCreateHash(pContext->hAlgorithm, &pContext->hInnerHash, pContext->pbInnerHash, pContext->cbHashObject, NULL, 0, 0)) ||
 		!BCRYPT_SUCCESS(BCryptCreateHash(pContext->hAlgorithm, &pContext->hOuterHash, pContext->pbOuterHash, pContext->cbHashObject, NULL, 0, 0)))
 	{
 		goto hmacInit_end;
 	}

 	if (cbPassword > BLOCK_SIZE)
 	{
 		BCRYPT_HASH_HANDLE hHash = NULL;
 		PUCHAR pbHashObject = malloc(pContext->cbHashObject);

 		bStatus =
 			BCRYPT_SUCCESS(BCryptCreateHash(pContext->hAlgorithm, &hHash, pbHashObject, pContext->cbHashObject, NULL, 0, 0)) &&
 			BCRYPT_SUCCESS(BCryptHashData(hHash, pbPassword, cbPassword, 0)) &&
 			BCRYPT_SUCCESS(BCryptGetProperty(hHash, BCRYPT_HASH_LENGTH, (PUCHAR)&cbPassword, sizeof(cbPassword), &cbResult, 0)) &&
 			BCRYPT_SUCCESS(BCryptFinishHash(hHash, key, cbPassword, 0));

 		if (hHash) BCryptDestroyHash(hHash);
 		free(pbHashObject);

 		if (!bStatus)
 		{
 			goto hmacInit_end;
 		}

 		pbPassword = key;
 	}

 	bStatus =
 		hmacPrecomputeDigest(pContext->hInnerHash, pbPassword, cbPassword, 0x36) &&
 		hmacPrecomputeDigest(pContext->hOuterHash, pbPassword, cbPassword, 0x5C);

 hmacInit_end:

 	if (bStatus == FALSE) hmacFree(pContext);

 	return bStatus;
 }

 static BOOL hmacCalculateInternal(BCRYPT_HASH_HANDLE hHashTemplate, PUCHAR pbData, DWORD cbData, PUCHAR pbOutput, DWORD cbOutput, DWORD cbHashObject)
 {
 	BOOL success = FALSE;
 	BCRYPT_HASH_HANDLE hHash = NULL;
 	PUCHAR pbHashObject = malloc(cbHashObject);

 	if (BCRYPT_SUCCESS(BCryptDuplicateHash(hHashTemplate, &hHash, pbHashObject, cbHashObject, 0)))
 	{
 		success =
 			BCRYPT_SUCCESS(BCryptHashData(hHash, pbData, cbData, 0)) &&
 			BCRYPT_SUCCESS(BCryptFinishHash(hHash, pbOutput, cbOutput, 0));

 		BCryptDestroyHash(hHash);
 	}

 	free(pbHashObject);

 	return success;
 }

 static BOOL hmacCalculate(PRF_CTX* pContext, PUCHAR pbData, DWORD cbData, PUCHAR pbDigest)
 {
 	DWORD cbResult;
 	DWORD cbHashObject;

 	return
 		BCRYPT_SUCCESS(BCryptGetProperty(pContext->hAlgorithm, BCRYPT_OBJECT_LENGTH, (PUCHAR)&cbHashObject, sizeof(cbHashObject), &cbResult, 0)) &&
 		hmacCalculateInternal(pContext->hInnerHash, pbData, cbData, pbDigest, DIGEST_SIZE, cbHashObject) &&
 		hmacCalculateInternal(pContext->hOuterHash, pbDigest, DIGEST_SIZE, pbDigest, DIGEST_SIZE, cbHashObject);
 }

 static void xor(LPBYTE ptr1, LPBYTE ptr2, DWORD dwLen)
 {
 	while (dwLen--)
 		*ptr1++ ^= *ptr2++;
 }

 BOOL pbkdf2(
 	PUCHAR pbPassword,
 	ULONG cbPassword,
 	PUCHAR pbSalt,
 	ULONG cbSalt,
 	DWORD cIterations,
 	PUCHAR pbDerivedKey,
 	ULONG cbDerivedKey)
 {
 	BOOL bStatus = FALSE;
 	DWORD l, r, dwULen, i, j;
 	BYTE Ti[DIGEST_SIZE];
 	BYTE V[DIGEST_SIZE];
 	LPBYTE U = malloc(max((cbSalt + 4), DIGEST_SIZE));
 	PRF_CTX prfCtx = { 0 };

 	if (pbPassword == NULL || cbPassword == 0 || pbSalt == NULL || cbSalt == 0 || cIterations == 0 || pbDerivedKey == NULL || cbDerivedKey == 0)
 	{
 		free(U);
 		return FALSE;
 	}

 	if (!hmacInit(&prfCtx, pbPassword, cbPassword))
 	{
 		goto PBKDF2_end;
 	}

 	l = (DWORD)ceil((double)cbDerivedKey / (double)DIGEST_SIZE);
 	r = cbDerivedKey - (l - 1) * DIGEST_SIZE;

 	for (i = 1; i <= l; i++)
 	{
 		ZeroMemory(Ti, DIGEST_SIZE);
 		for (j = 0; j < cIterations; j++)
 		{
 			if (j == 0)
 			{
 				// construct first input for PRF
 				memcpy(U, pbSalt, cbSalt);
 				U[cbSalt] = (BYTE)((i & 0xFF000000) >> 24);
 				U[cbSalt + 1] = (BYTE)((i & 0x00FF0000) >> 16);
 				U[cbSalt + 2] = (BYTE)((i & 0x0000FF00) >> 8);
 				U[cbSalt + 3] = (BYTE)((i & 0x000000FF));
 				dwULen = cbSalt + 4;
 			}
 			else
 			{
 				memcpy(U, V, DIGEST_SIZE);
 				dwULen = DIGEST_SIZE;
 			}

 			if (!hmacCalculate(&prfCtx, U, dwULen, V))
 			{
 				goto PBKDF2_end;
 			}

 			xor (Ti, V, DIGEST_SIZE);
 		}

 		if (i != l)
 		{
 			memcpy(&pbDerivedKey[(i - 1) * DIGEST_SIZE], Ti, DIGEST_SIZE);
 		}
 		else
 		{
 			// Take only the first r bytes
 			memcpy(&pbDerivedKey[(i - 1) * DIGEST_SIZE], Ti, r);
 		}
 	}

 	bStatus = TRUE;

 PBKDF2_end:

 	hmacFree(&prfCtx);
 	free(U);
 	return bStatus;
 }

 bool _zip_crypto_pbkdf2(const zip_uint8_t *key, zip_uint64_t key_length, const zip_uint8_t *salt, zip_uint16_t salt_length, zip_uint16_t iterations, zip_uint8_t* output, zip_uint16_t output_length)
 {
 	return
 		(key_length <= ZIP_UINT32_MAX) &&
 		pbkdf2((PUCHAR)key, (ULONG)key_length, (PUCHAR)salt, salt_length, iterations, output, output_length);
 }

 #endif


 struct _zip_crypto_aes_s
 {
 	BCRYPT_ALG_HANDLE hAlgorithm;
 	BCRYPT_KEY_HANDLE hKey;
 	ULONG cbKeyObject;
 	PUCHAR pbKeyObject;
 };

 _zip_crypto_aes_t *_zip_crypto_aes_new(const zip_uint8_t *key, zip_uint16_t key_size, zip_error_t *error)
 {
 	_zip_crypto_aes_t *aes = (_zip_crypto_aes_t *)calloc(1, sizeof(*aes));

 	ULONG cbResult;
 	ULONG key_length = key_size / 8;

 	if (aes == NULL)
 	{
 		zip_error_set(error, ZIP_ER_MEMORY, 0);
 		return NULL;
 	}

 	if (!BCRYPT_SUCCESS(BCryptOpenAlgorithmProvider(&aes->hAlgorithm, BCRYPT_AES_ALGORITHM, NULL, 0)))
 	{
 		_zip_crypto_aes_free(aes);
 		return NULL;
 	}

 	if (!BCRYPT_SUCCESS(BCryptSetProperty(aes->hAlgorithm, BCRYPT_CHAINING_MODE, (PUCHAR)BCRYPT_CHAIN_MODE_ECB, sizeof(BCRYPT_CHAIN_MODE_ECB), 0)))
 	{
 		_zip_crypto_aes_free(aes);
 		return NULL;
 	}

 	if (!BCRYPT_SUCCESS(BCryptGetProperty(aes->hAlgorithm, BCRYPT_OBJECT_LENGTH, (PUCHAR)&aes->cbKeyObject, sizeof(aes->cbKeyObject), &cbResult, 0)))
 	{
 		_zip_crypto_aes_free(aes);
 		return NULL;
 	}

 	aes->pbKeyObject = malloc(aes->cbKeyObject);

 	if (!BCRYPT_SUCCESS(BCryptGenerateSymmetricKey(aes->hAlgorithm, &aes->hKey, aes->pbKeyObject, aes->cbKeyObject, (PUCHAR)key, key_length, 0)))
 	{
 		_zip_crypto_aes_free(aes);
 		return NULL;
 	}

 	return aes;
 }

 void _zip_crypto_aes_free(_zip_crypto_aes_t *aes)
 {
 	if (aes == NULL)
 	{
 		return;
 	}

 	if (aes->hKey != NULL)
 	{
 		BCryptDestroyKey(aes->hKey);
 	}

 	if (aes->pbKeyObject != NULL)
 	{
 		free(aes->pbKeyObject);
 	}

 	if (aes->hAlgorithm != NULL)
 	{
 		BCryptCloseAlgorithmProvider(aes->hAlgorithm, 0);
 	}

 	free(aes);
 }

 bool _zip_crypto_aes_encrypt_block(_zip_crypto_aes_t *aes, const zip_uint8_t *in, zip_uint8_t *out)
 {
 	ULONG cbResult;
 	NTSTATUS status = BCryptEncrypt(aes->hKey, (PUCHAR)in, ZIP_CRYPTO_AES_BLOCK_LENGTH, NULL, NULL, 0, (PUCHAR)out, ZIP_CRYPTO_AES_BLOCK_LENGTH, &cbResult, 0);
 	return BCRYPT_SUCCESS(status);
 }

 struct _zip_crypto_hmac_s
 {
 	BCRYPT_ALG_HANDLE hAlgorithm;
 	BCRYPT_HASH_HANDLE hHash;
 	DWORD cbHashObject;
 	PUCHAR pbHashObject;
 	DWORD cbHash;
 	PUCHAR pbHash;
 };

 // https://code.msdn.microsoft.com/windowsdesktop/Hmac-Computation-Sample-11fe8ec1/sourcecode?fileId=42820&pathId=283874677

 _zip_crypto_hmac_t *_zip_crypto_hmac_new(const zip_uint8_t *secret, zip_uint64_t secret_length, zip_error_t *error)
 {
 	NTSTATUS status;
 	ULONG cbResult;
 	_zip_crypto_hmac_t *hmac;

 	if (secret_length > INT_MAX)
 	{
 		zip_error_set(error, ZIP_ER_INVAL, 0);
 		return NULL;
 	}

 	hmac = (_zip_crypto_hmac_t *)calloc(1, sizeof(*hmac));

 	if (hmac == NULL)
 	{
 		zip_error_set(error, ZIP_ER_MEMORY, 0);
 		return NULL;
 	}

 	status = BCryptOpenAlgorithmProvider(&hmac->hAlgorithm, BCRYPT_SHA1_ALGORITHM, NULL, BCRYPT_ALG_HANDLE_HMAC_FLAG);
 	if (!BCRYPT_SUCCESS(status))
 	{
 		_zip_crypto_hmac_free(hmac);
 		return NULL;
 	}

 	status = BCryptGetProperty(hmac->hAlgorithm, BCRYPT_OBJECT_LENGTH, (PUCHAR)&hmac->cbHashObject, sizeof(hmac->cbHashObject), &cbResult, 0);
 	if (!BCRYPT_SUCCESS(status))
 	{
 		_zip_crypto_hmac_free(hmac);
 		return NULL;
 	}

 	hmac->pbHashObject = malloc(hmac->cbHashObject);

 	status = BCryptGetProperty(hmac->hAlgorithm, BCRYPT_HASH_LENGTH, (PUCHAR)&hmac->cbHash, sizeof(hmac->cbHash), &cbResult, 0);
 	if (!BCRYPT_SUCCESS(status))
 	{
 		_zip_crypto_hmac_free(hmac);
 		return NULL;
 	}

 	hmac->pbHash = malloc(hmac->cbHash);

 	status = BCryptCreateHash(hmac->hAlgorithm, &hmac->hHash, hmac->pbHashObject, hmac->cbHashObject, (PUCHAR)secret, (ULONG)secret_length, 0);
 	if (!BCRYPT_SUCCESS(status))
 	{
 		_zip_crypto_hmac_free(hmac);
 		return NULL;
 	}

 	return hmac;
 }

 void _zip_crypto_hmac_free(_zip_crypto_hmac_t *hmac)
 {
 	if (hmac == NULL)
 	{
 		return;
 	}

 	if (hmac->hHash != NULL)
 	{
 		BCryptDestroyHash(hmac->hHash);
 	}

 	if (hmac->pbHash != NULL)
 	{
 		free(hmac->pbHash);
 	}

 	if (hmac->pbHashObject != NULL)
 	{
 		free(hmac->pbHashObject);
 	}

 	if (hmac->hAlgorithm)
 	{
 		BCryptCloseAlgorithmProvider(hmac->hAlgorithm, 0);
 	}

 	free(hmac);
 }

 bool _zip_crypto_hmac(_zip_crypto_hmac_t *hmac, zip_uint8_t *data, zip_uint64_t length)
 {
 	if (hmac == NULL || length > ULONG_MAX)
 	{
 		return false;
 	}

 	return BCRYPT_SUCCESS(BCryptHashData(hmac->hHash, data, (ULONG)length, 0));
 }

 bool _zip_crypto_hmac_output(_zip_crypto_hmac_t *hmac, zip_uint8_t *data)
 {
 	if (hmac == NULL)
 	{
 		return false;
 	}

 	return BCRYPT_SUCCESS(BCryptFinishHash(hmac->hHash, data, hmac->cbHash, 0));
 }

 ZIP_EXTERN bool
 zip_random(zip_uint8_t *buffer, zip_uint16_t length)
 {
 	return BCRYPT_SUCCESS(BCryptGenRandom(NULL, buffer, length, BCRYPT_USE_SYSTEM_PREFERRED_RNG));
 }
	/*
	zip_crypto_win.c -- Windows Crypto API wrapper.
	Copyright (C) 2018 Dieter Baron and Thomas Klausner

	This file is part of libzip, a library to manipulate ZIP archives.
	The authors can be contacted at <libzip@nih.at>

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions
	are met:
	1. Redistributions of source code must retain the above copyright
	notice, this list of conditions and the following disclaimer.
	2. Redistributions in binary form must reproduce the above copyright
	notice, this list of conditions and the following disclaimer in
	the documentation and/or other materials provided with the
	distribution.
	3. The names of the authors may not be used to endorse or promote
	products derived from this software without specific prior
	written permission.

	THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
	OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
	DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
	GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
	IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
	IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/
	#include <stdlib.h>

	#include "zipint.h"
	#include "zip_crypto.h"

	#define WIN32_LEAN_AND_MEAN
	#define NOCRYPT

	#include <Windows.h>
	#include <bcrypt.h>

	#pragma comment(lib, "bcrypt.lib")

	/*

	This code is using the Cryptography API: Next Generation (CNG)
	https://docs.microsoft.com/en-us/windows/desktop/seccng/cng-portal

	This API is supported on
	- Windows Vista or later (client OS)
	- Windows Server 2008 (server OS)
	- Windows Embedded Compact 2013 (don't know about Windows Embedded Compact 7)

	The code was developed for Windows Embedded Compact 2013 (WEC2013),
	but should be working for all of the above mentioned OSes.

	There are 2 restrictions for WEC2013, Windows Vista and Windows Server 2008:

	1.) The function "BCryptDeriveKeyPBKDF2" is not available

	I found some code which is implementing this function using the deprecated Crypto API here:
	https://www.idrix.fr/Root/content/view/37/54/

	I took this code and converted it to the newer CNG API. The original code was more
	flexible, but this is not needed here so i refactored it a bit and just kept what is needed.

	The define "HAS_BCRYPTDERIVEKEYPBKDF2" controls whether "BCryptDeriveKeyPBKDF2"
	of the CNG API is used or not. This define must not be set if you are compiling for WEC2013 or Windows Vista.


	2.) "BCryptCreateHash" can't manage the memory needed for the hash object internally

	On Windows 7 or later it is possible to pass NULL for the hash object buffer.
	This is not supported on WEC2013, so we have to handle the memory allocation/deallocation ourselves.
	There is no #ifdef to control that, because this is working for all supported OSes.

	*/

	#if !defined(WINCE) && !defined(__MINGW32__)
	#define HAS_BCRYPTDERIVEKEYPBKDF2
	#endif

	#ifdef HAS_BCRYPTDERIVEKEYPBKDF2

	bool _zip_crypto_pbkdf2(const zip_uint8_t key, zip_uint64_t key_length, const zip_uint8_t salt, zip_uint16_t salt_length, zip_uint16_t iterations, zip_uint8_t* output, zip_uint16_t output_length)
	{
	BCRYPT_ALG_HANDLE hAlgorithm = NULL;

	if (!BCRYPT_SUCCESS(BCryptOpenAlgorithmProvider(&hAlgorithm, BCRYPT_SHA1_ALGORITHM, NULL, BCRYPT_ALG_HANDLE_HMAC_FLAG)))
	{
	return false;
	}

	bool result = BCRYPT_SUCCESS(BCryptDeriveKeyPBKDF2(hAlgorithm, (PUCHAR)key, (ULONG)key_length, (PUCHAR)salt, salt_length, iterations, output, output_length, 0));

	BCryptCloseAlgorithmProvider(hAlgorithm, 0);

	return result;
	}

	#else

	#include <math.h>

	#define DIGEST_SIZE 20
	#define BLOCK_SIZE 64

	typedef struct
	{
	BCRYPT_ALG_HANDLE hAlgorithm;
	BCRYPT_HASH_HANDLE hInnerHash;
	BCRYPT_HASH_HANDLE hOuterHash;
	ULONG cbHashObject;
	PUCHAR pbInnerHash;
	PUCHAR pbOuterHash;
	} PRF_CTX;

	static void hmacFree(PRF_CTX* pContext)
	{
	if (pContext->hOuterHash) BCryptDestroyHash(pContext->hOuterHash);
	if (pContext->hInnerHash) BCryptDestroyHash(pContext->hInnerHash);
	free(pContext->pbOuterHash);
	free(pContext->pbInnerHash);
	if (pContext->hAlgorithm) BCryptCloseAlgorithmProvider(pContext->hAlgorithm, 0);
	}

	static BOOL hmacPrecomputeDigest(BCRYPT_HASH_HANDLE hHash, PUCHAR pbPassword, DWORD cbPassword, BYTE mask)
	{
	BYTE buffer[BLOCK_SIZE];
	DWORD i;

	if (cbPassword > BLOCK_SIZE)
	{
	return FALSE;
	}

	memset(buffer, mask, sizeof(buffer));

	for (i = 0; i < cbPassword; ++i)
	{
	buffer[i] = (char)(pbPassword[i] ^ mask);
	}

	return BCRYPT_SUCCESS(BCryptHashData(hHash, buffer, sizeof(buffer), 0));
	}

	static BOOL hmacInit(PRF_CTX* pContext, PUCHAR pbPassword, DWORD cbPassword)
	{
	BOOL bStatus = FALSE;
	ULONG cbResult;
	BYTE key[DIGEST_SIZE];

	if (!BCRYPT_SUCCESS(BCryptOpenAlgorithmProvider(&pContext->hAlgorithm, BCRYPT_SHA1_ALGORITHM, NULL, 0)) \|\|
	!BCRYPT_SUCCESS(BCryptGetProperty(pContext->hAlgorithm, BCRYPT_OBJECT_LENGTH, (PUCHAR)&pContext->cbHashObject, sizeof(pContext->cbHashObject), &cbResult, 0)) \|\|
	((pContext->pbInnerHash = malloc(pContext->cbHashObject)) == NULL) \|\|
	((pContext->pbOuterHash = malloc(pContext->cbHashObject)) == NULL) \|\|
	!BCRYPT_SUCCESS(BCryptCreateHash(pContext->hAlgorithm, &pContext->hInnerHash, pContext->pbInnerHash, pContext->cbHashObject, NULL, 0, 0)) \|\|
	!BCRYPT_SUCCESS(BCryptCreateHash(pContext->hAlgorithm, &pContext->hOuterHash, pContext->pbOuterHash, pContext->cbHashObject, NULL, 0, 0)))
	{
	goto hmacInit_end;
	}

	if (cbPassword > BLOCK_SIZE)
	{
	BCRYPT_HASH_HANDLE hHash = NULL;
	PUCHAR pbHashObject = malloc(pContext->cbHashObject);

	bStatus =
	BCRYPT_SUCCESS(BCryptCreateHash(pContext->hAlgorithm, &hHash, pbHashObject, pContext->cbHashObject, NULL, 0, 0)) &&
	BCRYPT_SUCCESS(BCryptHashData(hHash, pbPassword, cbPassword, 0)) &&
	BCRYPT_SUCCESS(BCryptGetProperty(hHash, BCRYPT_HASH_LENGTH, (PUCHAR)&cbPassword, sizeof(cbPassword), &cbResult, 0)) &&
	BCRYPT_SUCCESS(BCryptFinishHash(hHash, key, cbPassword, 0));

	if (hHash) BCryptDestroyHash(hHash);
	free(pbHashObject);

	if (!bStatus)
	{
	goto hmacInit_end;
	}

	pbPassword = key;
	}

	bStatus =
	hmacPrecomputeDigest(pContext->hInnerHash, pbPassword, cbPassword, 0x36) &&
	hmacPrecomputeDigest(pContext->hOuterHash, pbPassword, cbPassword, 0x5C);

	hmacInit_end:

	if (bStatus == FALSE) hmacFree(pContext);

	return bStatus;
	}

	static BOOL hmacCalculateInternal(BCRYPT_HASH_HANDLE hHashTemplate, PUCHAR pbData, DWORD cbData, PUCHAR pbOutput, DWORD cbOutput, DWORD cbHashObject)
	{
	BOOL success = FALSE;
	BCRYPT_HASH_HANDLE hHash = NULL;
	PUCHAR pbHashObject = malloc(cbHashObject);

	if (BCRYPT_SUCCESS(BCryptDuplicateHash(hHashTemplate, &hHash, pbHashObject, cbHashObject, 0)))
	{
	success =
	BCRYPT_SUCCESS(BCryptHashData(hHash, pbData, cbData, 0)) &&
	BCRYPT_SUCCESS(BCryptFinishHash(hHash, pbOutput, cbOutput, 0));

	BCryptDestroyHash(hHash);
	}

	free(pbHashObject);

	return success;
	}

	static BOOL hmacCalculate(PRF_CTX* pContext, PUCHAR pbData, DWORD cbData, PUCHAR pbDigest)
	{
	DWORD cbResult;
	DWORD cbHashObject;

	return
	BCRYPT_SUCCESS(BCryptGetProperty(pContext->hAlgorithm, BCRYPT_OBJECT_LENGTH, (PUCHAR)&cbHashObject, sizeof(cbHashObject), &cbResult, 0)) &&
	hmacCalculateInternal(pContext->hInnerHash, pbData, cbData, pbDigest, DIGEST_SIZE, cbHashObject) &&
	hmacCalculateInternal(pContext->hOuterHash, pbDigest, DIGEST_SIZE, pbDigest, DIGEST_SIZE, cbHashObject);
	}

	static void xor(LPBYTE ptr1, LPBYTE ptr2, DWORD dwLen)
	{
	while (dwLen--)
	ptr1++ ^= ptr2++;
	}

	BOOL pbkdf2(
	PUCHAR pbPassword,
	ULONG cbPassword,
	PUCHAR pbSalt,
	ULONG cbSalt,
	DWORD cIterations,
	PUCHAR pbDerivedKey,
	ULONG cbDerivedKey)
	{
	BOOL bStatus = FALSE;
	DWORD l, r, dwULen, i, j;
	BYTE Ti[DIGEST_SIZE];
	BYTE V[DIGEST_SIZE];
	LPBYTE U = malloc(max((cbSalt + 4), DIGEST_SIZE));
	PRF_CTX prfCtx = { 0 };

	if (pbPassword == NULL \|\| cbPassword == 0 \|\| pbSalt == NULL \|\| cbSalt == 0 \|\| cIterations == 0 \|\| pbDerivedKey == NULL \|\| cbDerivedKey == 0)
	{
	free(U);
	return FALSE;
	}

	if (!hmacInit(&prfCtx, pbPassword, cbPassword))
	{
	goto PBKDF2_end;
	}

	l = (DWORD)ceil((double)cbDerivedKey / (double)DIGEST_SIZE);
	r = cbDerivedKey - (l - 1) * DIGEST_SIZE;

	for (i = 1; i <= l; i++)
	{
	ZeroMemory(Ti, DIGEST_SIZE);
	for (j = 0; j < cIterations; j++)
	{
	if (j == 0)
	{
	// construct first input for PRF
	memcpy(U, pbSalt, cbSalt);
	U[cbSalt] = (BYTE)((i & 0xFF000000) >> 24);
	U[cbSalt + 1] = (BYTE)((i & 0x00FF0000) >> 16);
	U[cbSalt + 2] = (BYTE)((i & 0x0000FF00) >> 8);
	U[cbSalt + 3] = (BYTE)((i & 0x000000FF));
	dwULen = cbSalt + 4;
	}
	else
	{
	memcpy(U, V, DIGEST_SIZE);
	dwULen = DIGEST_SIZE;
	}

	if (!hmacCalculate(&prfCtx, U, dwULen, V))
	{
	goto PBKDF2_end;
	}

	xor (Ti, V, DIGEST_SIZE);
	}

	if (i != l)
	{
	memcpy(&pbDerivedKey[(i - 1) * DIGEST_SIZE], Ti, DIGEST_SIZE);
	}
	else
	{
	// Take only the first r bytes
	memcpy(&pbDerivedKey[(i - 1) * DIGEST_SIZE], Ti, r);
	}
	}

	bStatus = TRUE;

	PBKDF2_end:

	hmacFree(&prfCtx);
	free(U);
	return bStatus;
	}

	bool _zip_crypto_pbkdf2(const zip_uint8_t key, zip_uint64_t key_length, const zip_uint8_t salt, zip_uint16_t salt_length, zip_uint16_t iterations, zip_uint8_t* output, zip_uint16_t output_length)
	{
	return
	(key_length <= ZIP_UINT32_MAX) &&
	pbkdf2((PUCHAR)key, (ULONG)key_length, (PUCHAR)salt, salt_length, iterations, output, output_length);
	}

	#endif


	struct _zip_crypto_aes_s
	{
	BCRYPT_ALG_HANDLE hAlgorithm;
	BCRYPT_KEY_HANDLE hKey;
	ULONG cbKeyObject;
	PUCHAR pbKeyObject;
	};

	_zip_crypto_aes_t _zip_crypto_aes_new(const zip_uint8_t key, zip_uint16_t key_size, zip_error_t *error)
	{
	_zip_crypto_aes_t aes = (_zip_crypto_aes_t )calloc(1, sizeof(*aes));

	ULONG cbResult;
	ULONG key_length = key_size / 8;

	if (aes == NULL)
	{
	zip_error_set(error, ZIP_ER_MEMORY, 0);
	return NULL;
	}

	if (!BCRYPT_SUCCESS(BCryptOpenAlgorithmProvider(&aes->hAlgorithm, BCRYPT_AES_ALGORITHM, NULL, 0)))
	{
	_zip_crypto_aes_free(aes);
	return NULL;
	}

	if (!BCRYPT_SUCCESS(BCryptSetProperty(aes->hAlgorithm, BCRYPT_CHAINING_MODE, (PUCHAR)BCRYPT_CHAIN_MODE_ECB, sizeof(BCRYPT_CHAIN_MODE_ECB), 0)))
	{
	_zip_crypto_aes_free(aes);
	return NULL;
	}

	if (!BCRYPT_SUCCESS(BCryptGetProperty(aes->hAlgorithm, BCRYPT_OBJECT_LENGTH, (PUCHAR)&aes->cbKeyObject, sizeof(aes->cbKeyObject), &cbResult, 0)))
	{
	_zip_crypto_aes_free(aes);
	return NULL;
	}

	aes->pbKeyObject = malloc(aes->cbKeyObject);

	if (!BCRYPT_SUCCESS(BCryptGenerateSymmetricKey(aes->hAlgorithm, &aes->hKey, aes->pbKeyObject, aes->cbKeyObject, (PUCHAR)key, key_length, 0)))
	{
	_zip_crypto_aes_free(aes);
	return NULL;
	}

	return aes;
	}

	void _zip_crypto_aes_free(_zip_crypto_aes_t *aes)
	{
	if (aes == NULL)
	{
	return;
	}

	if (aes->hKey != NULL)
	{
	BCryptDestroyKey(aes->hKey);
	}

	if (aes->pbKeyObject != NULL)
	{
	free(aes->pbKeyObject);
	}

	if (aes->hAlgorithm != NULL)
	{
	BCryptCloseAlgorithmProvider(aes->hAlgorithm, 0);
	}

	free(aes);
	}

	bool _zip_crypto_aes_encrypt_block(_zip_crypto_aes_t aes, const zip_uint8_t in, zip_uint8_t *out)
	{
	ULONG cbResult;
	NTSTATUS status = BCryptEncrypt(aes->hKey, (PUCHAR)in, ZIP_CRYPTO_AES_BLOCK_LENGTH, NULL, NULL, 0, (PUCHAR)out, ZIP_CRYPTO_AES_BLOCK_LENGTH, &cbResult, 0);
	return BCRYPT_SUCCESS(status);
	}

	struct _zip_crypto_hmac_s
	{
	BCRYPT_ALG_HANDLE hAlgorithm;
	BCRYPT_HASH_HANDLE hHash;
	DWORD cbHashObject;
	PUCHAR pbHashObject;
	DWORD cbHash;
	PUCHAR pbHash;
	};

	// https://code.msdn.microsoft.com/windowsdesktop/Hmac-Computation-Sample-11fe8ec1/sourcecode?fileId=42820&pathId=283874677

	_zip_crypto_hmac_t _zip_crypto_hmac_new(const zip_uint8_t secret, zip_uint64_t secret_length, zip_error_t *error)
	{
	NTSTATUS status;
	ULONG cbResult;
	_zip_crypto_hmac_t *hmac;

	if (secret_length > INT_MAX)
	{
	zip_error_set(error, ZIP_ER_INVAL, 0);
	return NULL;
	}

	hmac = (_zip_crypto_hmac_t )calloc(1, sizeof(hmac));

	if (hmac == NULL)
	{
	zip_error_set(error, ZIP_ER_MEMORY, 0);
	return NULL;
	}

	status = BCryptOpenAlgorithmProvider(&hmac->hAlgorithm, BCRYPT_SHA1_ALGORITHM, NULL, BCRYPT_ALG_HANDLE_HMAC_FLAG);
	if (!BCRYPT_SUCCESS(status))
	{
	_zip_crypto_hmac_free(hmac);
	return NULL;
	}

	status = BCryptGetProperty(hmac->hAlgorithm, BCRYPT_OBJECT_LENGTH, (PUCHAR)&hmac->cbHashObject, sizeof(hmac->cbHashObject), &cbResult, 0);
	if (!BCRYPT_SUCCESS(status))
	{
	_zip_crypto_hmac_free(hmac);
	return NULL;
	}

	hmac->pbHashObject = malloc(hmac->cbHashObject);

	status = BCryptGetProperty(hmac->hAlgorithm, BCRYPT_HASH_LENGTH, (PUCHAR)&hmac->cbHash, sizeof(hmac->cbHash), &cbResult, 0);
	if (!BCRYPT_SUCCESS(status))
	{
	_zip_crypto_hmac_free(hmac);
	return NULL;
	}

	hmac->pbHash = malloc(hmac->cbHash);

	status = BCryptCreateHash(hmac->hAlgorithm, &hmac->hHash, hmac->pbHashObject, hmac->cbHashObject, (PUCHAR)secret, (ULONG)secret_length, 0);
	if (!BCRYPT_SUCCESS(status))
	{
	_zip_crypto_hmac_free(hmac);
	return NULL;
	}

	return hmac;
	}

	void _zip_crypto_hmac_free(_zip_crypto_hmac_t *hmac)
	{
	if (hmac == NULL)
	{
	return;
	}

	if (hmac->hHash != NULL)
	{
	BCryptDestroyHash(hmac->hHash);
	}

	if (hmac->pbHash != NULL)
	{
	free(hmac->pbHash);
	}

	if (hmac->pbHashObject != NULL)
	{
	free(hmac->pbHashObject);
	}

	if (hmac->hAlgorithm)
	{
	BCryptCloseAlgorithmProvider(hmac->hAlgorithm, 0);
	}

	free(hmac);
	}

	bool _zip_crypto_hmac(_zip_crypto_hmac_t hmac, zip_uint8_t data, zip_uint64_t length)
	{
	if (hmac == NULL \|\| length > ULONG_MAX)
	{
	return false;
	}

	return BCRYPT_SUCCESS(BCryptHashData(hmac->hHash, data, (ULONG)length, 0));
	}

	bool _zip_crypto_hmac_output(_zip_crypto_hmac_t hmac, zip_uint8_t data)
	{
	if (hmac == NULL)
	{
	return false;
	}

	return BCRYPT_SUCCESS(BCryptFinishHash(hmac->hHash, data, hmac->cbHash, 0));
	}

	ZIP_EXTERN bool
	zip_random(zip_uint8_t *buffer, zip_uint16_t length)
	{
	return BCRYPT_SUCCESS(BCryptGenRandom(NULL, buffer, length, BCRYPT_USE_SYSTEM_PREFERRED_RNG));
	}