How do I decrypt a file with Crypto++ that was encrypted with C#
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25-09-2019 - |
Question
I would like to decrypt a file that I previously encrypted with C# using the TripleDESCryptoServiceProvider.
Here's my code for encrypting:
private static void EncryptData(MemoryStream streamToEncrypt)
{
// initialize the encryption algorithm
TripleDES algorithm = new TripleDESCryptoServiceProvider();
byte[] desIV = new byte[8];
byte[] desKey = new byte[16];
for (int i = 0; i < 8; ++i)
{
desIV[i] = (byte)i;
}
for (int j = 0; j < 16; ++j)
{
desKey[j] = (byte)j;
}
FileStream outputStream = new FileStream(TheCryptedSettingsFilePath, FileMode.OpenOrCreate, FileAccess.Write);
outputStream.SetLength(0);
CryptoStream encStream = new CryptoStream(outputStream, algorithm.CreateEncryptor(desKey, desIV),
CryptoStreamMode.Write);
// write the encrypted data to the file
encStream.Write(streamToEncrypt.ToArray(), 0, (int)streamToEncrypt.Length);
encStream.Close();
outputStream.Close();
}
I already found the Crypto++ library and managed to build and link it. So I tried to decrypt the file that was stored with C# after the encryption with the following (native) C++ code:
FILE *fp;
long len;
char *buf;
if (_wfopen_s(&fp, _T("MyTest.bin"), _T("rb")) != 0)
{
return false;
}
fseek(fp ,0 ,SEEK_END); //go to end
len = ftell(fp); //get position at end (length)
fseek(fp, 0, SEEK_SET); //go to beg.
buf = (char *)malloc(len); //malloc buffer
fread(buf, len, 1, fp); //read into buffer
fclose(fp);
BYTE pIV[] = {0, 1, 2, 3, 4, 5, 6, 7};
BYTE pKey[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
const BYTE* lpData = (const BYTE*)(LPCTSTR)buf;
size_t bufferSize = strlen(buf);
BYTE* result = (BYTE *)malloc(bufferSize);
CFB_FIPS_Mode<DES_EDE2>::Decryption decryption_DES_EDE2_CFB;
decryption_DES_EDE2_CFB.SetKeyWithIV(pKey, sizeof(pKey), pIV, sizeof(pIV));
decryption_DES_EDE2_CFB.ProcessString(result, lpData, bufferSize);
That code won't decrypt properly. The result after the decryption doesn't match the plain text that was encrypted previously. Any idea about my code?
Solution 2
I managed to do that task with Windows Crypto API as stated in my other post.
OTHER TIPS
Can you encrypt and decrypt in c++? Can you encrypt and decrypt in c#?
Are you sure you are using the same mode, padding and encrypt, decrypt sequence?
tdes.Mode = CipherMode.ECB;
tdes.Padding = PaddingMode.PKCS7;
Try CBC mode (the TripleDESCryptoServiceProvider's default mode)