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PBKDF2.c
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PBKDF2.c
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/*
* Copyright (c) 2017-2023, DB Systel GmbH
* Copyright (c) 2023, Frank Schwab
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*
* Author: Frank Schwab
*
* Version: 2.3.0
*
* Example program to show correct and incorrect password storage with the PBKDF2 function
*
* Changes:
* 2015-05-26: V1.0.0: Created
* 2015-09-22: V2.0.0: Have a choice of hash types
* 2017-03-03: V2.1.0: Cleaned up data types for counts and lengths
* 2017-03-03: V2.2.0: Removed unnecessary methods and make hex char conversion to byte a bit faster
* 2023-08-12: V2.3.0: This is C, not C++, so set correct file extension
*/
/*
* INCLUDES
*/
#include <Windows.h>
#include <tchar.h>
#include <math.h>
#include <stdio.h>
#include <bcrypt.h>
/*
* DEFINES
*/
#ifndef NT_SUCCESS
#define NT_SUCCESS(Status) ((NTSTATUS)(Status) >= 0)
#endif
// Size of buffer for error messages
#define ERROR_BUFFER_SIZE 511
/*
* TYPEDEFS
*/
/*
* TOCTET is a data type that defines 8 binary bits and is *not* a character
* (Welcome to the strange world of C).
*/
typedef UCHAR TOCTET;
/*
* Define a default "unsuccessful" NT STATUS for initialization.
* This is not a true NTSTATUS.
*/
#ifndef NTSTATUS_UNSUCCESSFUL
#define NTSTATUS_UNSUCCESSFUL (-1)
#endif
/*
* Minimum and maximum values for the hash type
*/
#define MIN_HASH_TYPE 1
#define MAX_HASH_TYPE 5
/*
* Minimum and maximum value of the salt if it is interpreted as an integer
*/
#define MIN_SALT 0
#define MAX_SALT INT_MAX
/*
* Minimum and maximum value of the iteration count if it is interpreted as an integer
*/
#define MIN_ITERATION_COUNT 1
#define MAX_ITERATION_COUNT 5000000
/*
* Argument macros
*/
#define ARGV_HASH_TYPE argv[1]
#define ARGV_SALT argv[2]
#define ARGV_ITERATION_COUNT argv[3]
#define ARGV_PASSWORD argv[4]
/*
* Macros for error checking
*/
#define RESET_ERROR_MSG *errorBuffer = _T('\0')
#define IS_ERROR_MSG_SET *errorBuffer != _T('\0')
#define IS_ERROR_MSG_NOT_SET *errorBuffer == _T('\0')
/*
* Variables for duration measurement
*/
LARGE_INTEGER startTickValue;
double tickDuration = 0.0;
/*
* Start the timer for duration measurement
*/
void startTimer() {
QueryPerformanceCounter(&startTickValue);
}
/*
* Get the time in seconds of one timer tick
*/
void getTickDuration() {
LARGE_INTEGER frequency;
QueryPerformanceFrequency(&frequency);
tickDuration = 1.0 / frequency.QuadPart;
}
/*
* Get the number of elapsed timer ticks
*/
long long getElapsedTicks() {
LARGE_INTEGER now;
QueryPerformanceCounter(&now);
return (now.QuadPart - startTickValue.QuadPart);
}
/*
* Get elapsed time
*/
double getElapsedTime() {
long long elapsedTicks = getElapsedTicks();
if (tickDuration == 0.0)
getTickDuration();
return (elapsedTicks * tickDuration);
}
/*
* Convert a string into an integer with bounds checking
*/
int getIntegerArg(const TCHAR* pArgName, const TCHAR* pArg, const int minValue, const int maxValue, TCHAR* const errorBuffer, const int errorBufferSize) {
int result;
RESET_ERROR_MSG;
result = _ttoi(pArg);
if (errno != 0) {
_stprintf_s(errorBuffer, errorBufferSize, _T("\"%s\" is not an integer\n"), pArgName);
return 0;
}
if (result < minValue) {
_stprintf_s(errorBuffer, errorBufferSize, _T("\"%s\" is smaller than minimum value of %d\n"), pArgName, minValue);
return 0;
}
if (result > maxValue) {
_stprintf_s(errorBuffer, errorBufferSize, _T("\"%s\" is larger than maximum value of %d\n"), pArgName, maxValue);
return 0;
}
return result;
}
/*
* Hexadecimal characters for conversion into a hex string
*/
const TCHAR* const HEX_DIGITS = _T("0123456789ABCDEF");
/*
* Convert a byte buffer into a string of hexadecimal characters separated by blanks
*/
TCHAR* bytesToHex(const TOCTET* const byteBuffer, const int bufferSize) {
int resultSize = bufferSize * 3;
TCHAR* pResult = (TCHAR*)malloc(resultSize * sizeof(TCHAR));
if (pResult != NULL) {
TCHAR* pActResult = pResult;
const TOCTET* pActByte = byteBuffer;
for (int j = 1; j <= bufferSize; j++) {
int v = (*pActByte) & 0xff;
*pActResult = HEX_DIGITS[v >> 4]; pActResult++;
*pActResult = HEX_DIGITS[v & 0x0f]; pActResult++;
*pActResult = ' '; pActResult++;
pActByte++;
}
pActResult--;
*pActResult = _T('\0');
}
return pResult;
}
/*
* Get the value of one hexadecimal character as a byte
*/
TOCTET getHexCharValue(const TCHAR hexChar) {
int workValue;
/*
* This method works on a very low level. It subtracts the base values
* of the valid characters to obtain the corresponding byte value.
*/
workValue = (int)hexChar - (int)_T('0');
if (workValue >= 0)
if (workValue <= 9)
return (TOCTET)workValue;
else {
workValue -= _T('A') - _T('0') - 10;
if (workValue >= 10)
if (workValue <= 15)
return (TOCTET)workValue;
else {
workValue -= _T('a') - _T('A');
if (workValue >= 10)
if (workValue <= 15)
return (TOCTET)workValue;
}
}
// If we get here the character was not a valid hex character
return (TOCTET)255;
}
/*
* Convert a string of upper case hexadecimal characters into a byte array
*/
TOCTET* hexStringToByteArray(const TCHAR* const pHexText, const int hexTextSize, int* const pByteArraySize, TCHAR* const errorBuffer, const int errorBufferSize) {
RESET_ERROR_MSG;
BOOLEAN isHexTextSizeOdd = ((hexTextSize & 1) != 0);
int allocationSize = (hexTextSize >> 1);
if (isHexTextSizeOdd)
allocationSize++;
*pByteArraySize = allocationSize;
TOCTET* result = (TOCTET*) malloc(allocationSize);
if (result != NULL) {
const TCHAR* pActChar = pHexText;
TOCTET* pActByte = result;
TOCTET actValue;
TOCTET byteValue = 0;
BOOLEAN isLowNibble = isHexTextSizeOdd;
for (int actPos = 1; actPos <= hexTextSize; actPos++) {
actValue = getHexCharValue(*pActChar);
if (actValue <= 15) {
if (isLowNibble) {
*pActByte = (byteValue | actValue);
pActByte++;
} else
byteValue = (TOCTET) (actValue << 4);
} else {
_stprintf_s(errorBuffer, errorBufferSize, _T("Invalid hex character \'%c\' at position %d of hex string \"%s\"\n"), *pActChar, actPos, pHexText);
break;
}
isLowNibble = !isLowNibble;
pActChar++;
}
} else
_stprintf_s(errorBuffer, errorBufferSize, _T("Could not allocate %d bytes for hex conversion byte array\n"), *pByteArraySize);
return result;
}
/*
* Convert a string of hexadecimal characters into a byte array
*/
void safeHexStringToByteArray(TCHAR* const hexText, TOCTET** byteArray, int* const byteArraySize, TCHAR* const errorBuffer, const int errorBufferSize) {
const int hexTextSize = (int) _tcslen(hexText);
*byteArray = hexStringToByteArray(hexText, hexTextSize, byteArraySize, errorBuffer, errorBufferSize);
}
#ifndef _UNICODE
/*
* If we are in ANSI mode we need a method to convert an ANSI string into an UTF-16 string
*/
void getPasswordUTF16Encoding(const TCHAR* const password,
const int passwordSize,
wchar_t** passwordInUTF16,
int* const pPasswordInUTF16Size,
TCHAR* const errorBuffer,
const int errorBufferSize) {
RESET_ERROR_MSG;
int bufferSize;
*pPasswordInUTF16Size = MultiByteToWideChar(CP_ACP, 0, password, passwordSize, NULL, 0);
bufferSize = *pPasswordInUTF16Size * sizeof(wchar_t);
*passwordInUTF16 = (wchar_t*)malloc(bufferSize);
if (*passwordInUTF16 != NULL)
MultiByteToWideChar(CP_ACP, 0, password, passwordSize, *passwordInUTF16, *pPasswordInUTF16Size);
else
_stprintf_s(errorBuffer, errorBufferSize, _T("Could not allocate %d bytes for passwordInUTF16\n"), bufferSize);
}
#endif
void getPasswordUTF8EncodingFromUTF16(const TCHAR* const password,
const int passwordSize,
TOCTET** passwordInUTF8,
int* const pPasswordInUTF8Size,
TCHAR* const errorBuffer,
const int errorBufferSize) {
*pPasswordInUTF8Size = WideCharToMultiByte(CP_UTF8, 0, password, passwordSize, NULL, 0, NULL, NULL);
*passwordInUTF8 = (TOCTET*)malloc(*pPasswordInUTF8Size);
if (*passwordInUTF8 != NULL)
WideCharToMultiByte(CP_UTF8, 0, password, passwordSize, (LPSTR)*passwordInUTF8, *pPasswordInUTF8Size, NULL, NULL);
else
_stprintf_s(errorBuffer, errorBufferSize, _T("Could not allocate %d bytes for passwordInUTF8\n"), *pPasswordInUTF8Size);
}
/*
* Convert the password from the native format (Unicode or ANSI) into the UTF-8 encoding as a byte array
*/
void getPasswordUTF8Encoding(const TCHAR* const password,
const int passwordSize,
TOCTET** passwordInUTF8,
int* const pPasswordInUTF8Size,
TCHAR* const errorBuffer,
const int errorBufferSize) {
RESET_ERROR_MSG;
#ifdef _UNICODE
/*
* If we are in Unicode mode we just convert the UTF-16 characters to UTF-8
*/
getPasswordUTF8EncodingFromUTF16(password, passwordSize, passwordInUTF8, pPasswordInUTF8Size, errorBuffer, errorBufferSize);
#else
/*
* If we are in ANSI mode we first need to convert the ANSI characters to UTF-16 and then from UTF-16 to UTF-8
*/
// First convert ANSI to UTF-16
int passwordInUnicodeSize;
wchar_t* passwordInUnicode;
getPasswordUTF16Encoding(password, passwordSize, &passwordInUnicode, &passwordInUnicodeSize, errorBuffer, errorBufferSize);
if (passwordInUnicode != NULL) {
// Then convert UTF-16 to UTF-8
getPasswordUTF8EncodingFromUTF16(passwordInUnicode, passwordInUnicodeSize, passwordInUTF8, pPasswordInUTF8Size, errorBuffer, errorBufferSize);
free((void*) passwordInUnicode);
}
#endif
}
/*
* Calculate the value of PBKDF2 for a password in UTF-8 encoding, a salt as a byte array an an iteration count.
*/
void calculatePBKDF2(TOCTET** ppDerivedKey,
int* const pDerivedKeySize,
LPCWSTR pHashType,
TOCTET* pSalt,
int saltSize,
int iterationCount,
TOCTET* password,
int passwordSize,
TCHAR* const errorBuffer,
const int errorBufferSize) {
BCRYPT_ALG_HANDLE handleHash = NULL;
ULONG outputSize;
NTSTATUS status = NTSTATUS_UNSUCCESSFUL;
const TCHAR* const apiErrorMessage = _T("Error 0x%x returned by %s\n");
RESET_ERROR_MSG;
//Open an algorithm handle to an HMAC
if (NT_SUCCESS(status = BCryptOpenAlgorithmProvider(
&handleHash,
pHashType,
NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG))) {
// Get the size of the hash
if (NT_SUCCESS(status = BCryptGetProperty(handleHash,
BCRYPT_HASH_LENGTH,
(PUCHAR)pDerivedKeySize,
(ULONG)sizeof(int),
(ULONG*)&outputSize,
(ULONG)0))) {
// Allocate space for the hash result
*ppDerivedKey = (TOCTET*)malloc(*pDerivedKeySize);
if (*ppDerivedKey != NULL) {
//Calculate PBKDF2 with the hash
if (!NT_SUCCESS(status = BCryptDeriveKeyPBKDF2(
handleHash,
password,
(ULONG)passwordSize,
(PUCHAR)pSalt,
(ULONG)saltSize,
(ULONGLONG)iterationCount,
(PUCHAR)*ppDerivedKey,
(ULONG)*pDerivedKeySize,
(ULONG)0)))
_stprintf_s(errorBuffer, errorBufferSize, apiErrorMessage, status, _T("BCryptDeriveKeyPBKDF2"));
} else
_stprintf_s(errorBuffer, errorBufferSize, _T("Could not allocate %d bytes for hash value\n"), *pDerivedKeySize);
} else
_stprintf_s(errorBuffer, errorBufferSize, apiErrorMessage, status, _T("BCryptGetProperty"));
BCryptCloseAlgorithmProvider(handleHash, (ULONG)0);
} else
_stprintf_s(errorBuffer, errorBufferSize, apiErrorMessage, status, _T("BCryptOpenAlgorithmProvider"));
}
/*
* Check whether a given file handle is a console or a file. "Redirected" means that the console is redirected to a file
*/
BOOLEAN isHandleRedirected(const HANDLE handle) {
DWORD mode;
// GetConsoleMode only returns 0 if the handle points to the console
return (GetConsoleMode(handle, &mode) == 0);
}
/*
* Write a text buffer to a file handle
*/
void writeBuffer(const HANDLE fileHandle, const BOOLEAN isRedirected, TCHAR* const text) {
DWORD charsWritten;
if (!isRedirected) {
#ifndef _UNICODE
// This does not make sense, at all! The name of the next function is "WriteConsoleA" in ANSI mode so it
// should expect ANSI encoded strings and convert them to the console's code page.
// But in fact it expects OEM encoded strings and so we have to convert to OEM encoded strings
// before calling WriteConsoleA. This is simply plain wrong.
CharToOem(text, text);
#endif
WriteConsole(fileHandle, text, (DWORD)_tcslen(text), &charsWritten, NULL); // This writes characters
} else {
WriteFile(fileHandle, text, (DWORD)_tcslen(text) * sizeof(TCHAR), &charsWritten, NULL); // But this writes bytes
}
}
// List of hash algorithms that can be used
LPCWSTR HASH_ALGORITHM[5] = { BCRYPT_SHA1_ALGORITHM, BCRYPT_SHA256_ALGORITHM, BCRYPT_SHA384_ALGORITHM, BCRYPT_SHA512_ALGORITHM, BCRYPT_SHA512_ALGORITHM };
/*
* The main program
*/
int _tmain(const int argc, TCHAR* const argv[]) {
TCHAR errorBuffer[ERROR_BUFFER_SIZE + 1]; // Bloody stupid null termination character
int returnValue = 0;
HANDLE outputHandle = GetStdHandle(STD_OUTPUT_HANDLE);
HANDLE errorHandle = GetStdHandle(STD_ERROR_HANDLE);
BOOLEAN isOutputRedirected = isHandleRedirected(outputHandle);
BOOLEAN isErrorRedirected = isHandleRedirected(errorHandle);
TOCTET* releasePassword = NULL;
TOCTET* releaseSalt = NULL;
TOCTET* releaseDerivedKey = NULL;
if (argc >= 5) {
//Should I do it right or not?
BOOLEAN doItRight = (argc >= 6);
// 1. Get the hash type
int hashType;
hashType = getIntegerArg(_T("hashType"), ARGV_HASH_TYPE, MIN_HASH_TYPE, MAX_HASH_TYPE, errorBuffer, ERROR_BUFFER_SIZE) - 1;
if (IS_ERROR_MSG_SET) {
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
returnValue = 2;
goto Exit;
}
// 2. Get the salt
int salt;
int saltArraySize;
TOCTET* saltArray;
if (doItRight) {
/*
* If we should do it right we interpret the salt as an array of bytes
*/
safeHexStringToByteArray(ARGV_SALT, &saltArray, &saltArraySize, errorBuffer, ERROR_BUFFER_SIZE);
releaseSalt = saltArray;
} else {
/*
* If we should to it wrong we interpret the salt as an integer
*/
salt = getIntegerArg(_T("salt"), ARGV_SALT, MIN_SALT, MAX_SALT, errorBuffer, ERROR_BUFFER_SIZE);
saltArraySize = sizeof(salt);
saltArray = (TOCTET*)&salt;
}
if (IS_ERROR_MSG_SET) {
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
returnValue = 2;
goto Exit;
}
// 3. Get the iteration count
int iterationCount = getIntegerArg(_T("iterationCount"), ARGV_ITERATION_COUNT, MIN_ITERATION_COUNT, MAX_ITERATION_COUNT, errorBuffer, ERROR_BUFFER_SIZE);
if (IS_ERROR_MSG_SET) {
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
returnValue = 2;
goto Exit;
}
// 4. Get the password
//Attention: password has been converted from OEM code page to Windows character set (A) or UTF-16 (W)!
const TCHAR* const password = ARGV_PASSWORD;
const int passwordSize = (int) _tcslen(password);
int passwordBytesSize = 0;
TOCTET* passwordBytes = NULL;
if (doItRight) {
/*
* If we should do it right we now get the UTF-8 encoding of the password
*/
int passwordInUTF8Size = 0;
TOCTET* passwordInUTF8 = NULL;
getPasswordUTF8Encoding(password, passwordSize, &passwordInUTF8, &passwordInUTF8Size, errorBuffer, ERROR_BUFFER_SIZE);
if (IS_ERROR_MSG_NOT_SET) {
passwordBytesSize = passwordInUTF8Size;
passwordBytes = passwordInUTF8;
releasePassword = passwordInUTF8;
} else {
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
returnValue = 3;
goto Exit;
}
} else {
/*
* If we should do it wrong we use the password as it is. I.e. ANSI characters in ANSI mode and UTF-16 characters in Unicode mode.
*/
passwordBytesSize = (int)(_tcslen(password) * sizeof(TCHAR));
passwordBytes = (TOCTET*)password;
}
/*
* Finally we get to the point. Here we calculate the PBKDF2 and measure the time duration needed to calculate it
*/
int derivedKeySize = 0;
TOCTET* pDerivedKey = NULL;
startTimer();
calculatePBKDF2(&pDerivedKey, &derivedKeySize, HASH_ALGORITHM[hashType], saltArray, saltArraySize, iterationCount, passwordBytes, passwordBytesSize, errorBuffer, ERROR_BUFFER_SIZE);
double duration = getElapsedTime();
releaseDerivedKey = pDerivedKey;
if (IS_ERROR_MSG_NOT_SET) {
TCHAR* saltText;
if (doItRight)
saltText = bytesToHex(saltArray, saltArraySize);
else {
saltText = (TCHAR*)malloc(20 * sizeof(TCHAR));
if (saltText != NULL)
_itot_s(*(int*)saltArray, saltText, 20, 10);
}
if (saltText != NULL) {
// Print the parameters and the result
const TCHAR* const pbkdf2AsText = bytesToHex(pDerivedKey, derivedKeySize);
_stprintf_s(errorBuffer, ERROR_BUFFER_SIZE, _T("HashType: %ws, Salt: %s, IterationCount: %d, Password: \'%s\', PBKDF2: %s\n"), HASH_ALGORITHM[hashType], saltText, iterationCount, password, pbkdf2AsText);
writeBuffer(outputHandle, isOutputRedirected, errorBuffer);
free((void*)saltText);
free((void*)pbkdf2AsText);
// Print the time measurement
_stprintf_s(errorBuffer, ERROR_BUFFER_SIZE, _T("Duration: %d ms\n"), lround(duration * 1000));
writeBuffer(outputHandle, isOutputRedirected, errorBuffer);
} else {
_tcscpy_s(errorBuffer, sizeof(errorBuffer), _T("Could not allocate salt text array\n"));
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
returnValue = 3;
goto Exit;
}
} else {
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
returnValue = 2;
goto Exit;
}
} else {
_tcscpy_s(errorBuffer, sizeof(errorBuffer), _T("Not enough arguments\n"));
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
_tcscpy_s(errorBuffer, sizeof(errorBuffer), _T("Usage: pbkdf2 <hashType> <salt> <iterationCount> <password> [doItRight]\n"));
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
_tcscpy_s(errorBuffer, sizeof(errorBuffer), _T(" hashType: 1=SHA-1, 2=SHA-256, 3=SHA384, 5=SHA512\n"));
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
_tcscpy_s(errorBuffer, sizeof(errorBuffer), _T(" doItRight: If present the salt is interpreted as a byte array and\n"));
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
_tcscpy_s(errorBuffer, sizeof(errorBuffer), _T(" the password is converted to UTF-8 before hashing\n"));
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
_tcscpy_s(errorBuffer, sizeof(errorBuffer), _T(" Otherwise the salt is interpreted as an integer and\n"));
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
_tcscpy_s(errorBuffer, sizeof(errorBuffer), _T(" the password is used in the ANSI or UTF-16 encoding\n"));
writeBuffer(errorHandle, isErrorRedirected, errorBuffer);
returnValue = 1;
}
Exit:
if (releasePassword != NULL)
free((void*)releasePassword);
if (releaseSalt != NULL)
free((void*)releaseSalt);
if (releaseDerivedKey != NULL)
free((void*)releaseDerivedKey);
return returnValue;
}