バイナリ ファイルを暗号化するために作成したものと同じ結果を生成する.NET (理想的には C#)アルゴリズムが必要です。私は今から 1 週間コードを追い詰めようとしてきましたが、ほとんど成功していません。vb6
decrypt
私はVB6復号化VB.NETで文字列を暗号化する方法からRC2
始めましたが、それは半分の解決策であり、 AES
. いくつかいじった後、vb6
コードが機能するようになりましたが、同じ結果を生成するAES
方法が見つかりません。c#
私はそれが私が作っている方法と関係があると思いKey
ますIV
. 私は暗号化サービスについて調べてきましたが、私の試みは 2 つの基本的なタイプに分けることができます。私が試しPasswordDeriveBytes.CryptDeriveKey
て、それを動作させようとしている場所aes
。まったく成功しません。そして、その動作を模倣しようとしたところを試します。vb6
以下に、コードと最も近いc#
試みを投稿します。100%確実とは言えませんが、vb6
完璧なので、そこで変更が必要な場合は、私はそれを受け入れます。.net dll
p invoke を使用する方法があり、 my から呼び出されるようにする方法があることを知っていvb apps
ます。私はそのように行かないほうがいいです。
VB6 関数
Public Function Crypt_File(PathToSourceFile As String, PathToDestFile As String, Password As String, HowTo As CryptMethod) As Boolean
Const FName As String = "mdlCryptography.Encrypt_file"
Dim CryptoContext As Long
Dim strProvider As String
Dim HashHnd As Long
Dim CrypKey As Long
Dim Step As Integer
Dim CryptBuff As String
Dim InFileNum As Long, OutFileNum As Long
Dim BytesRemaining As Long, CurrentBufferSize As Long
Dim MAX_BUFFER_SIZE As Long
Dim DoCryptFinalise As Long
Dim Buff As String
On Error GoTo Trap:
Step = 10
Crypt_File = False
If PathToSourceFile = PathToDestFile Then '
Err.Raise 334, FName, "Sourse and Dest Path are the same"
End If
MAX_BUFFER_SIZE = (2 ^ 20) * 100 '100 MB
Buff = vbNullChar
strProvider = MS_ENH_RSA_AES_PROV_A & vbNullChar
If Not CBool(CryptAcquireContext(CryptoContext, ByVal Buff, ByVal strProvider, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) Then
Err.Raise 33410, FName, "Unable to Acquire Context: " & MS_ENH_RSA_AES_PROV_A
End If
If Not CBool(CryptCreateHash(CryptoContext, CALG_SHA_256, ByVal 0&, ByVal 0&, HashHnd)) Then
Err.Raise 33420, FName, "Unable to Create a hash object. " & MS_ENH_RSA_AES_PROV_A
End If
If Not CBool(CryptHashData(HashHnd, Password, Len(Password), ByVal 0&)) Then
Err.Raise 33430, FName, "Unable to Hash password. "
End If
If Not CBool(CryptDeriveKey(CryptoContext, CALG_AES_256, HashHnd, ByVal CRYPT_NO_SALT, CrypKey)) Then
Err.Raise 33440, FName, "Unable to Derive Key. "
End If
'Clear HashHnd
If HashHnd <> 0 Then
Call CryptDestroyHash(HashHnd)
End If
HashHnd = 0
'Prep Data For encryption
DoCryptFinalise = 0
InFileNum = FreeFile
Step = 20
Open PathToSourceFile For Binary Access Read As #InFileNum
If LenB(Dir$(PathToDestFile)) > 0 Then
Kill PathToDestFile
End If
OutFileNum = FreeFile
Step = 25
Open PathToDestFile For Binary Access Write As #OutFileNum
BytesRemaining = LOF(InFileNum)
'Loop through File Chunks
Do While BytesRemaining > 0
If BytesRemaining >= MAX_BUFFER_SIZE Then
CurrentBufferSize = MAX_BUFFER_SIZE
Else
CurrentBufferSize = BytesRemaining
DoCryptFinalise = 1
End If
Buff = String$(CurrentBufferSize, vbNullChar)
Get #InFileNum, , Buff
If HowTo = CryptMethod.Encrypt Then
CryptBuff = EncryptBuffer(CrypKey, DoCryptFinalise, Buff)
Else
CryptBuff = DecryptBuffer(CrypKey, DoCryptFinalise, Buff)
End If
Put #OutFileNum, , CryptBuff
BytesRemaining = BytesRemaining - CurrentBufferSize
Loop
Close #InFileNum
Close #OutFileNum
Crypt_File = True
GoTo Fin
Trap:
Crypt_File = False
If Step = 20 Then
Close #InFileNum
End If
If Step = 25 Then
Close #InFileNum
Close #OutFileNum
End If
Err.Raise Err.Number, Err.source, Err.Description
Fin:
If CrypKey <> 0 Then
Call CryptDestroyKey(CrypKey)
End If
If HashHnd <> 0 Then
Call CryptDestroyHash(HashHnd)
End If
End Function
Private Function EncryptBuffer(CrypKey As Long, DoCryptFinalise As Long, Buff As String) As String
Dim EncDataLength As Long, EnctBuffLen As Long
Dim CryptBuff As String
EncDataLength = Len(Buff)
EnctBuffLen = EncDataLength + AES_BLOCK_SIZE
CryptBuff = String$(EnctBuffLen, vbNullChar)
LSet CryptBuff = Buff
If Not CBool(CryptEncrypt(CrypKey, ByVal 0&, ByVal DoCryptFinalise, ByVal 0&, CryptBuff, EncDataLength, EnctBuffLen)) Then
' Close #InFileNum
' Close #OutFileNum
Err.Raise 33450, "mdlCryptography.EncryptBuffer", "Encryption Error"
End If
EncryptBuffer = Left$(CryptBuff, EncDataLength)
End Function
Private Function DecryptBuffer(CrypKey As Long, DoCryptFinalise As Long, Buff As String) As String
Dim EncDataLength As Long
Dim CryptBuff As String
EncDataLength = Len(Buff)
CryptBuff = String$(EncDataLength, vbNullChar)
LSet CryptBuff = Buff
If Not CBool(CryptDecrypt(CrypKey, ByVal 0&, ByVal DoCryptFinalise, ByVal 0&, CryptBuff, EncDataLength)) Then
' Close #InFileNum
' Close #OutFileNum
Err.Raise 33450, "mdlCryptography.DecryptBuffer", "Decryption Error"
End If
DecryptBuffer = Left$(CryptBuff, EncDataLength)
End Function
c# 非常に洗練されていない
private void Crypt(bool DoEn)
{
int Rfc2898KeygenIterations = 100;
int AesKeySizeInBits = 128;
byte[] rawPlaintext ;//= System.Text.Encoding.Unicode.GetBytes("This is all clear now!");
byte[] cipherText = null;
byte[] plainText = null;
using (Aes aes = new AesManaged())
{
int KeyStrengthInBytes = aes.KeySize / 8;
SHA256 MySHA = new SHA256Cng();
MySHA.Initialize();
plainText = Encoding.ASCII.GetBytes(txtPassword.Text);
aes.Key = MySHA.ComputeHash(plainText );
aes.IV = Encoding.ASCII.GetBytes("0000000000000000");
if (DoEn)
{
//using (FileStream fs = new FileStream(txtOut.Text,FileMode.CreateNew ))
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, aes.CreateEncryptor(), CryptoStreamMode.Write))
{
//using (StreamReader myFile = new StreamReader(txtIn.Text))
//{
// rawPlaintext = System.Text.Encoding.ASCII.GetBytes(myFile.ReadToEnd());
rawPlaintext = File.ReadAllBytes(txtIn.Text);
cs.Write(rawPlaintext, 0, rawPlaintext.Length);
//}
}
cipherText = ms.ToArray();
File.WriteAllBytes(txtOut.Text, cipherText);
}
}
else
{
//using (FileStream fs = new FileStream(txtIn.Text, FileMode.CreateNew))
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write))
{
//using (StreamReader myFile = new StreamReader(txtOut.Text))
//{
//string s = myFile.r.ReadToEnd();
rawPlaintext = File.ReadAllBytes(txtOut.Text); //System.Text.Encoding.ASCII.GetBytes(s);
//cipherText = new int[rawPlaintext.Length];
cs.Write(rawPlaintext, 0, rawPlaintext.Length);
//cs.Write(cipherText, 0, cipherText.Length);
//}
}
cipherText = ms.ToArray();
File.WriteAllBytes(txtIn.Text, cipherText);
}
}
}
//string s = System.Text.Encoding.ASCII.GetString(plainText);
//Console.WriteLine(s);
}