使用 CryptDecrypt 解密 RijndaelManaged 加密字符串
好的，我正在尝试使用 C++ 中的 Win32 Crypto API 来解密使用 RijndaelManaged 类在 C# (.NET 2) 中加密的字符串。 但我一点运气都没有，我得到了乱码或坏数据 Win32 错误代码。 我所有的密钥、IV 和盐都匹配，我在手表中查找了这两个测试应用程序。 我已经花了所有的时间看它，但我正式被困住了。
C#
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(GetPassPhrase(), salt, 1000);
RijndaelManaged rijndael = new RijndaelManaged();
rijndael.BlockSize = 128;
rijndael.KeySize = 256;
rijndael.Mode = CipherMode.CBC;
rijndael.Key = pdb.GetBytes(m_KeySize);
rijndael.IV = GetIV(iv);
ICryptoTransform encryptor = rijndael.CreateEncryptor();
MemoryStream msEncrypt = new MemoryStream();
CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
Byte[] encryptedBytes = null;
Byte[] toBeEncrypted = UnicodeEncoding.Unicode.GetBytes(value);
csEncrypt.Write(toBeEncrypted, 0, toBeEncrypted.Length);
csEncrypt.FlushFinalBlock();
encryptedBytes = msEncrypt.ToArray();
无论如何，这里是解密它的
keyBlob.hdr.bType = PLAINTEXTKEYBLOB;
keyBlob.hdr.bVersion = CUR_BLOB_VERSION;
keyBlob.hdr.reserved = 0;
keyBlob.hdr.aiKeyAlg = CALG_AES_256;
keyBlob.cbKeySize = KEY_SIZE;
keyBlob.rgbKeyData = &byKey[0];
if ( CryptImportKey( hProv, (const LPBYTE) &keyBlob, sizeof(BLOBHEADER) + sizeof(DWORD) + KEY_SIZE, 0, CRYPT_EXPORTABLE, &hKey ) )
{
if ( CryptSetKeyParam( hKey, KP_IV, (const BYTE *) &byIV, 0))
{
DWORD dwLen = iDestLen;
if ( CryptDecrypt( hKey, 0, TRUE, 0, pbyData, &dwLen))
{
if ( dwLen < (DWORD) *plOutSize)
{
memcpy_s(pbyOutput, *plOutSize, pbyData, dwLen);
*plOutSize = dwLen;
bRet = TRUE;
}
}
else
{
// Log
DWORD dwErr = ::GetLastError();
int y =0;
}
}
}
C++ 是：我成功调用 CryptAcquireContext 并且我的 C++ 执行良好。 谁能发现我的方法中的错误。 我开始感到沮丧了:(
Ok I'm trying to use the Win32 Crypto API in C++ to decrypt a string encrypted in C# (.NET 2) with the RijndaelManaged Class. But I'm having no luck at all i get jibberish or a bad data Win32 error code. All my keys, IV and salt match, I've looked in the watch for both test apps. I've spent all say looking at it and I'm officialy stuck.
Anyway here is the C#
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(GetPassPhrase(), salt, 1000);
RijndaelManaged rijndael = new RijndaelManaged();
rijndael.BlockSize = 128;
rijndael.KeySize = 256;
rijndael.Mode = CipherMode.CBC;
rijndael.Key = pdb.GetBytes(m_KeySize);
rijndael.IV = GetIV(iv);
ICryptoTransform encryptor = rijndael.CreateEncryptor();
MemoryStream msEncrypt = new MemoryStream();
CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
Byte[] encryptedBytes = null;
Byte[] toBeEncrypted = UnicodeEncoding.Unicode.GetBytes(value);
csEncrypt.Write(toBeEncrypted, 0, toBeEncrypted.Length);
csEncrypt.FlushFinalBlock();
encryptedBytes = msEncrypt.ToArray();
The C++ to decrypt it is:
keyBlob.hdr.bType = PLAINTEXTKEYBLOB;
keyBlob.hdr.bVersion = CUR_BLOB_VERSION;
keyBlob.hdr.reserved = 0;
keyBlob.hdr.aiKeyAlg = CALG_AES_256;
keyBlob.cbKeySize = KEY_SIZE;
keyBlob.rgbKeyData = &byKey[0];
if ( CryptImportKey( hProv, (const LPBYTE) &keyBlob, sizeof(BLOBHEADER) + sizeof(DWORD) + KEY_SIZE, 0, CRYPT_EXPORTABLE, &hKey ) )
{
if ( CryptSetKeyParam( hKey, KP_IV, (const BYTE *) &byIV, 0))
{
DWORD dwLen = iDestLen;
if ( CryptDecrypt( hKey, 0, TRUE, 0, pbyData, &dwLen))
{
if ( dwLen < (DWORD) *plOutSize)
{
memcpy_s(pbyOutput, *plOutSize, pbyData, dwLen);
*plOutSize = dwLen;
bRet = TRUE;
}
}
else
{
// Log
DWORD dwErr = ::GetLastError();
int y =0;
}
}
}
I'm calling CryptAcquireContext successfully and my C++ is executing fine. Can anyone spot the error in my ways. It's starting to depress me know :(
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好吧，我的错，我没有在 C++ 中包含 keyblob 的 Struct def，事实证明您需要带有标头的密钥的连续数据块，但我使用的是 MSDN 示例，该示例有一个指向密钥数据的指针。 这是错误的！
Ok my fault, I didn't include the Struct def for the keyblob in the C++ and it turns out you need a contigous block of data for the key with the header but I was using the MSDN example that had a pointer to the key data. Which is wrong!
我看到您正在使用 CBC 链接模式来加密纯文本。
您确定使用相同的链接模式来解密密文吗？
（抱歉。我无法从代码中理解这一点）
I see that you are using CBC chaining mode to encrypt the plain text.
Are you sure you are using the same chaining mode to decrypt the cypher text?
(I am sorry. I am not able to understand that from the code)
您应该检查一些事情，因为缺少一些代码（声明等）：
There are a handful of things you should check, since some of the code (declarations etc) are missing: