CryptDecrypt function failing on Windows Server 2012

Question

Hi,
I have a sample program which does encryption / decryption.
This program works on Win7 and Win8.1 but fails on Windows Server 2012.
Please can somebody help me on resolving this issue?
const char KEY_FILE[255] = "C:\\key.txt";
In Constructor:
dwResult= 0;
hProv = 0;
hKey = 0;
hSessionKey = 0;
cbBlob = 0;
pbBlob = NULL;
cbBlob = file_length(KEY_FILE);
pbBlob = (BYTE*)malloc(cbBlob + 1);
memset(pbBlob, 0, cbBlob + 1);
FILE *fp = fopen(KEY_FILE, "rb");
if (fp) {
fread(pbBlob, 1, cbBlob, fp);
fclose(fp);
} else {
free(pbBlob);
pbBlob = NULL;
if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, 0))
dwResult = GetLastError();
if (dwResult == NTE_BAD_KEYSET)
if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_NEWKEYSET))
dwResult = GetLastError();
MessageBox("Error [0x%x]: CryptAcquireContext() failed.", "Information", MB_OK);
return;
} else {
dwResult = GetLastError();
return;
if (pbBlob) {
if (!CryptImportKey(hProv, pbBlob, cbBlob, 0, 0, &hSessionKey))
dwResult = GetLastError();
MessageBox("Error [0x%x]: CryptImportKey() failed.", "Information", MB_OK);
return;
} else {
if (!CryptImportKey(hProv, PrivateKeyWithExponentOfOne, sizeof(PrivateKeyWithExponentOfOne), 0, 0, &hKey))
dwResult = GetLastError();
MessageBox("Error CryptImportKey() failed.", "Information", MB_OK);
return;
if (!CryptGenKey(hProv, CALG_RC4, CRYPT_EXPORTABLE, &hSessionKey))
dwResult = GetLastError();
MessageBox("Error CryptGenKey() failed.", "Information", MB_OK);
return;
//{{AFX_DATA_INIT(CCryptoEncryptionDlg)
m_cipher = _T("");
m_clear = _T("Encrypt me");
When I click on Encryption Button:
UpdateData();
unsigned long length = m_clear.GetLength() +1;
unsigned char * cipherBlock = (unsigned char*)malloc(length);
memset(cipherBlock, 0, length);
memcpy(cipherBlock, m_clear, length -1);
if (!CryptEncrypt(hSessionKey, 0, TRUE, 0, cipherBlock, &length, length))
dwResult = GetLastError();
MessageBox("Error CryptEncrypt() failed.", "Information", MB_OK);
return;
m_cipher = cipherBlock;
m_clear = "";
free(cipherBlock);
UpdateData(FALSE);
When I click on Decrypt button:
UpdateData();
unsigned long length = m_cipher.GetLength() +1;
unsigned char * cipherBlock = (unsigned char*)malloc(length);
memset(cipherBlock, 0, length);
memcpy(cipherBlock, m_cipher, length -1);
int retVal = CryptDecrypt(hSessionKey, 0, TRUE, CRYPT_DECRYPT_RSA_NO_PADDING_CHECK, (BYTE*)cipherBlock, &length);
if (!retVal)
dwResult = GetLastError();
MessageBox("Error CryptDecrypt() failed.", "Information", MB_OK);
return;
dwResult = GetLastError();
m_clear = cipherBlock;
m_cipher = "";
free(cipherBlock);
UpdateData(FALSE);
The source is from http://www.codeproject.com/Articles/11578/Encryption-using-the-Win-Crypto-API
I just got the source code from above link and compiled in VS2012. The same code works as-is in Win8.1 but fails in loading itself in Windows Server 2012.
Thanks in advance.
Regards,
Raj

Answer 1

Windows CE is pretty old but I see that used a bit in 3rd world markets where people are not rich enough to afford more modern gear.
I use 7-zip for backups, and the SDK is open source which means it can be used in another project such a specialized backup or other tool
7-zip has the AES in the SDK which is been checked as solid.
Place your rig specifics into your signature like I have, makes it 100x easier!
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