FreeRDP/winpr/libwinpr/crypto/test/TestCryptoProtectMemory.c

#include <winpr/crt.h>
#include <winpr/print.h>
#include <winpr/crypto.h>
#include <winpr/wlog.h>

static const char* SECRET_PASSWORD_TEST = "MySecretPassword123!";

int TestCryptoProtectMemory(int argc, char* argv[])
{
	int cbPlainText;
	int cbCipherText;
	char* pPlainText;
	BYTE* pCipherText;
	pPlainText = (char*) SECRET_PASSWORD_TEST;
	cbPlainText = strlen(pPlainText) + 1;
	cbCipherText = cbPlainText + (CRYPTPROTECTMEMORY_BLOCK_SIZE - (cbPlainText % CRYPTPROTECTMEMORY_BLOCK_SIZE));
	printf("cbPlainText: %d cbCipherText: %d\n", cbPlainText, cbCipherText);
	pCipherText = (BYTE*) malloc(cbCipherText);
	if (!pCipherText)
	{
		printf("Unable to allocate memory\n");
		return -1;
	}
	CopyMemory(pCipherText, pPlainText, cbPlainText);
	ZeroMemory(&pCipherText[cbPlainText], (cbCipherText - cbPlainText));

	if (!CryptProtectMemory(pCipherText, cbCipherText, CRYPTPROTECTMEMORY_SAME_PROCESS))
	{
		printf("CryptProtectMemory failure\n");
		return -1;
	}

	printf("PlainText: %s (cbPlainText = %d, cbCipherText = %d)\n", pPlainText, cbPlainText, cbCipherText);
	winpr_HexDump("crypto.test", WLOG_DEBUG, pCipherText, cbCipherText);

	if (!CryptUnprotectMemory(pCipherText, cbCipherText, CRYPTPROTECTMEMORY_SAME_PROCESS))
	{
		printf("CryptUnprotectMemory failure\n");
		return -1;
	}

	printf("Decrypted CipherText: %s\n", pCipherText);
	SecureZeroMemory(pCipherText, cbCipherText);
	free(pCipherText);
	return 0;
}