如何将vb.net转换为vb6 [英] How to convert vb.net to vb6
问题描述
我已经在c＃和vb.net中编写了代码，但现在要求是vb6.Can我将vb.net代码转换为vb6。如何在vb6中添加命名空间System.Security.Cryptography I have written code in c# and vb.net but now the requirement is vb6.Can i convert vb.net code to vb6.How to add namespace in vb6 System.Security.Cryptography 这篇关于如何将vb.net转换为vb6的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
< pre lang =vb> Imports System.Collections.Generic
Imports System.Linq
Imports System.Text
Imports System.Security.Cryptography
< span class =code-keyword> Imports System.IO
命名空间 RijndaelEncDec
< span class =code-keyword>公共 枚举 CryptoEventType
消息
FileProgress
结束 枚举
公共 类 CryptoEventArgs
继承 EventArgs
私有 m_type 作为 CryptoEventType
私有 m_message 作为 字符串
私有 m_fileLength 作为 整数
私有 m_filePosition 作为 整数
公共 Sub 新（ ByVal 消息作为 字符串）
m_type = CryptoEventType.Message
我 .m_message =信息
结束 Sub
公开 Sub 新（ ByVal fileName 作为 字符串， ByVal fileLength 作为 整数， ByVal filePosition 作为 整数）
m_type = CryptoEventType.FileProgress
我 .m_fileLength = fileLength
我 .m_filePosition = filePosition
m_message = fileName
结束 Sub
公共 ReadOnly 属性类型（ ） As CryptoEventType
获取
返回 m_type
结束 获取
结束 属性
公开 ReadOnly 属性消息（） As 字符串
获取
返回 m_message
结束 获取
<跨度class =code-keyword>结束 属性
公开 ReadOnly 属性 FileName（） As 字符串
获取
返回 m_message
结束 获取
< span class =code-keyword>结束 属性
公共 ReadOnly 属性 FileLength（） As 整数
获取
返回 m_fileLength
结束 获取
结束 属性
公共 ReadOnly 属性 FilePosition（） As 整数
获取
返回 m_filePosition
结束 获取
结束 属性
结束 < span class =code-keyword> Class
Public Delegate Sub cryptoEventHandler（ ByVal sender As Object ， ByVal e As CryptoEventArgs）
''' < summary >
'''
''' < / summary >
公共 类 CryptoManager
私人 testHeader
' 用于验证解密是否成功
私有 testHeaderString 作为 字符串 = 没有什么
公共 Sub 新（）
testHeader = System.Text.Encoding.ASCII.GetBytes（ 测试标题）
testHeaderString = BitConverter.ToString（testHeader）
结束 < span class =code-keyword> Sub
公共 Sub getKeysFr omPassword（ ByVal 传递作为 字符串，< span class =code-keyword> ByRef rijnKey As Byte （）， ByRef rijnIV 作为 字节（））
Dim salt 作为 字节（）= System.Text.Encoding.ASCII.GetBytes（ System.Text.Encoding.ASCII.GetBytes）
Dim pb As 新 PasswordDeriveBytes（pass，salt）
rijnKey = pb.GetBytes（ 32 ）
rijnIV = pb.GetBytes（ 16 ）
结束 Sub
< span class =code-keyword> Const bufLen 作为 整数 = 4096
公共 Sub EncryptData （ ByVal inName 作为 [ String ]， ByVal outName 作为 [字符串]，< span class =code-keyword> ByVal rijnKey As Byte （）， ByVal rijnIV 作为 字节（））
Dim fin As FileStream = Nothing
Dim fout As FileStream = Nothing
Dim encStream As CryptoStream = Nothing
尝试
' 创建文件流来处理输入和输出文件。
fin = 新 FileStream（inName，FileMode.Open，FileAccess.Read）
fout = 新 FileStream（outName，FileMode.Create，FileAccess.Write）
' 创建变量以帮助读写。
Dim bin 作为 字节 （）= 新 字节（bufLen - 1 ）{}
' 这是加密的中间存储。
< span class =code-keyword> Dim rdlen 作为 长 = 0
' 这是写入的总字节数。
Dim totlen As Long = fin.Length
' 这是输入文件的总长度。
Dim len 作为 整数
' 这是一次要写入的字节数。
Dim rijn 作为 新 RijndaelManaged （）
rijn.Mode = CipherMode.CBC
rijn.KeySize = 256
rijn.BlockSize = 128
rijn.Padding = PaddingMode.PKCS7
encStream = 新 CryptoStream （fout，rijn.CreateEncryptor（rijnKey，rijnIV），CryptoStreamMode.Write）
' zakoduj testowy片段
encStream.Write（testHeader， 0 ，testHeader.Length）
' < span class =code-comment>从输入文件中读取，然后加密并写入输出文件。
while True
len = fin.Read（bin， 0 ，bufLen）
如果 len = 0 然后
退出 而
结束 如果
encStream.Write（bin， 0 ，len）
rdlen + = len
< span class =code-keyword>结束
最后
如果 encStream IsNot 没什么 然后
encStream.Close（）
结束 如果
如果 fout IsNot Nothing 然后
fout.Close（）
结束 如果
如果 fin IsNot Nothing 然后< /跨度>
fin.Close（）
结束 如果
结束 尝试
结束 Sub
公开 Sub EncryptBuffer（ ByVal buffer As [ String ]， ByVal outName As [ String ]， ByVal rijnKey 作为 字节（）， ByVal rijnIV 作为 字节（））
Dim fin As FileStream = Nothing
< span class =code-keyword> Dim fout As FileStream = Nothing
Dim encStream As CryptoStream = Nothing
尝试
' < span class =code-comment>创建文件流来处理输入和输出文件。
' fin = new FileStream（（inName，FileMode.Open，FileAccess.Read）;
Dim byteArray < span class =code-keyword> As Byte （）= Encoding.ASCII.GetBytes（buffer）
Dim mem 作为 新 MemoryStream（byteArray）
fout = 新 FileStream（outName，FileMode.Create，FileAccess.Write）
' 创建变量以帮助读写。
Dim bin As Byte （）= 新 字节（bufLen - 1 ）{}
' 这是加密的中间存储。
Dim rdlen As Long = 0
' 这是写入的总字节数。
Dim totlen 作为 长 = mem.Length
' 这是输入文件的总长度。
Dim len 作为 整数
' 这是一次要写入的字节数。
Dim rijn 作为 新 RijndaelManaged（ ）
rijn.Mode = CipherMode.CBC
rijn.KeySize = 256
rijn.BlockSize = 128
rijn.Padding = PaddingMode.PKCS7
encStream = 新 CryptoStream（fout，rijn.CreateEncryptor（rijnKey，rijnIV），CryptoStreamMode.Write）
' zakoduj testowy片段
encStream.Write（testHeader， 0 ，testHeader.Length）
' 从输入文件中读取，然后加密并写入输出文件。
True
len = mem.Read（bin， 0 ，bufLen）
如果 len = 0 然后
退出 虽然
结束 如果
encStream.Write （bin， 0 ，len）
rdlen + = len
结束
最后
如果 encStream IsNot Nothing 然后
encStream.Close（）
结束 如果
如果 fout IsNot 没什么 然后
fout.Close（）
结束 如果
如果 fin IsNot Nothing 然后
fin.Close（）
结束 如果
结束 尝试
结束 Sub
公开 功能 DecryptData（ ByVal inName As [字符串]， ByVal outName As [ String ]， ByVal rijnKey 作为 字节（）， ByVal rijnIV 作为 字节（）） As Boolean
' 创建文件流以处理输入和输出文件。
Dim fin As FileStream = Nothing
Dim fout As FileStream = Nothing
Dim decStream As CryptoStream = Nothing
尝试
fin = 新 FileStream（inName，FileMode.Open，FileAccess.Read）
' 创建变量以帮助读写。
Dim bin 作为 字节（）= < span class =code-keyword>新 字节（bufLen - 1 ）{}
' 这是加密的中间存储。
Dim rdlen 作为 长 = 0
' 这是写入的总字节数。
Dim totlen 作为 长 = fin.Length
' 这是输入文件的总长度。
Dim len 作为 整数
' 这是一次要写入的字节数。
Dim rijn 作为 新 RijndaelManaged（ ）
rijn.Mode = CipherMode.CBC
rijn.KeySize = 256
rijn.BlockSize = 128
rijn.Padding = PaddingMode.PKCS7
DES ds = new DESCryptoServiceProvider（）;
decStream = 新 CryptoStream（fin，rijn.CreateDecryptor（rijnKey，rijnIV），CryptoStreamMode.Read）
' odkoduj testowy片段
Dim test 作为 字节（）= 新 字节（testHeader.Length - 1 ）{}
decStream.Read（test， 0 ，testHeader.Length）
I f BitConverter.ToString（test）<> testHeaderString 然后
decStream.Clear（）
decStream = 没什么
返回 错误
结束 如果
' 创建输出文件
fout = 新 FileStream（outName，FileMode） .Create，FileAccess.Write）
' 从加密文件中读取并写入dercypted数据
True
len = decStream.Read（bin， 0 ，bufLen ）
如果 len = 0 然后
退出
结束 如果
fout.Write（bin， 0 ，len）
rdlen + = len
结束 < span class =code-keyword> while
返回 True
最后
如果 decStream IsNot Nothing 那么
decStream.Close（）
结束 如果
如果 fout IsNot Nothing 然后
fout.Close（）
结束 如果
如果 fin IsNot Nothing 然后
fin.Close（）
结束 如果
结束 尝试
结束 功能
结束 类
公开 类日志
公开 共享 logPermission 作为 布尔 = True
公共 共享 logFileLocation As [字符串] = D：\\ \\ C＃EncDecLogFile.txt
结束 类
公开 类 Rijndael
私人 pwd 作为 字符串 =
私有 testHeader 作为 字节 （）= 没什么
' 用于验证如果解密成功
私有 testHeaderString 作为 字符串 = 无
私有 cryptoKey As Byte(), cryptoIV As Byte()
Private crm As New CryptoManager()
Public Sub getPassword()
Try
pwd = \"1234567890\"
'get keys from password
Dim dk As Byte() = Nothing
Dim div As Byte() = Nothing
crm.getKeysFromPassword(pwd, dk, div)
cryptoKey = dk
cryptoIV = div
Catch ex As FormatException
Return
End Try
End Sub
Public Sub Encryption(ByVal filePath As String)
'sunil code with RSA
getPassword()
Const PROVIDER_RSA_FULL As Integer = 1
Const CONTAINER_NAME As String = \"KeyContainer\"
Dim cspParams As CspParameters
cspParams = New CspParameters(PROVIDER_RSA_FULL)
cspParams.KeyContainerName = CONTAINER_NAME
cspParams.Flags = CspProviderFlags.UseMachineKeyStore
cspParams.ProviderName = \"Microsoft Strong Cryptographic Provider\"
Dim originalPath As String = filePath.Substring(0, filePath.LastIndexOf(\"\\"))
Try
Dim curren t As DateTime = DateTime.Now
Dim RSA As New RSACryptoServiceProvider(cspParams)
Dim keyToEncrypt As Byte()
Dim encryptedKey As Byte()
Dim origName As String = filePath
Dim encName As String = origName & \".enc\"
Try
crm.EncryptData(origName, encName, cryptoKey, cryptoIV)
Dim fi As New FileInfo(origName)
Dim fi2 As New FileInfo(encName)
'remove readonly attribute
If (fi.Attributes And FileAttributes.[ReadOnly]) = FileAttributes.[ReadOnly] Then
fi.Attributes = fi.Attributes And Not FileAttributes.[ReadOnly]
End If
'copy creation and modification time
fi2.CreationTime = fi.CreationTime
fi2.LastWriteTime = fi.LastWriteTime
fi2.Attributes = FileAttributes.Normal Or FileAttributes.Archive
Dim data As Byte() = File.ReadAllBytes(encName)
'delete original file
File.Delete(encName)
'#Region \"write RSA (Public Private) key in xml files\"
Dim publicprivatexml As String = RSA.ToXmlString(True)
'#End Region
keyToEncrypt = System.Text.ASCIIEncoding.Unicode.GetBytes(pwd)
encryptedKey = RSA.Encrypt(keyToEncrypt, False)
'using (BinaryWriter bw = new BinaryWriter(File.Create(origName + \" \" + current.Date.Day.ToString() + current.Date.Month.ToString() + current.Date.Year.ToString() + current.TimeOfDay.Duration().Hours.ToString() + current.TimeOfDay.Duration().Minutes.ToString() + curre nt.TimeOfDay.Duration().Seconds.ToString() + \".enc\")))
Using bw As New BinaryWriter(File.Create(originalPath & \"\Encrypted.enc\"))
'Write data
bw.Seek(0, SeekOrigin.Begin)
bw.Write(data)
bw.Write(encryptedKey)
bw.Close()
'MessageBox.Show(\"File Encrypted\");
End Using
' MessageBox.Show(ex.Message);
Catch ex As CryptographicException
'MessageBox.Show(ex.Message);
Catch ex As IOException
'i.e. readonly
' MessageBox.Show(ex.Message);
Catch ex As UnauthorizedAccessException
End Try
'MessageBox.Show(ex.Message);
Catch ex As Exception
End Try
End Sub
Public Sub Decryption(ByVal filePath As String)
'sunil code with RSA
Const PROVIDER_RSA_FULL As Integer = 1
Const CONTAINER_NAME As String = \"KeyContainer\"
Dim cspParams As CspParameters
cspParams = New CspParameters(PROVIDER_RSA_FULL)
cspParams.KeyContainerName = CONTAINER_NAME
cspParams.Flags = CspProviderFlags.UseMachineKeyStore
cspParams.ProviderName = \"Microsoft Strong Cryptographic Provider\"
Dim originalPath As String = filePath.Substring(0, filePath.LastIndexOf(\"\\"))
Try
Dim current As DateTime = DateTime.Now
Dim encName As String = filePath & \"data\" & \".enc\"
Dim RSA As New RSACryptoServiceProvider(cspParams)
'#Region \"Seperate key and data\"
Dim alldata As Byte() = File.ReadAllBytes(filePath)
Dim getencryptedkey As Byte() = New Byte(127) {}
Dim data As Byte() = New Byte(alldata.Length - 129) {}
For k As Integer = 0 To alldata.Length - 129
data(k) = alldata(k)
Next
Dim i As Integer = alldata.Length - 128, j As Integer = 0
While i < alldata.Length
getencryptedkey(j) = alldata(i)
i += 1
j += 1
End While
Using bw As New BinaryWriter(File.Create(encName))
bw.Write(data)
bw.Close()
End Using
Dim publicprivatekeyxml As String = \"<rsakeyvalue><modulus>qwJYZm7ECFuktmofbVkm4J1kRf/L9521P70DaJhw/JNCwmCVItuaGEZWUlPZoMB6Q05Da7yYhkhVTH bybyxTcSMeQBsXb8jVqm3HWN3Quy8XITjGkuCsP8AijmXVV2RWa8T1oklN5SZfdaprue0ZWLjUFcZff5eay4igWjXpmVE=</modulus><exponent>AQAB</exponent><p>6RxsBsub9tG0hwRS92vLjxUuBF5adjifmLvB3cr1RnwcgX7EoVWiw/UPBzfiF/B9ZYkvu5EnL3ZTZ0Uae0eDrw==</p><q>u8zniy7nrMDyZHgnMR1yaL/w/bw0jPelo9t3h/1yOetFBRDYKGQQc3njLl/I8NIm0grug+x43vSOprh65m7y/w==</q><dp>ooqX5JEaehq1FyPzuePm9yjcgl1MFHzdA8F/p2g6aGBn+/9pmdk9egeo5+6WbvzYYvEqYE4RFa4a77omgelWrw==</dp><dq>lcTGjzgb6KiDZl5wGvo56JHSNfhnDFjfTzrSK7CS7N/UzkJtsGCEwiLda3lV/cAK142CQ9FNX7k3HnyW/rhSrw==</dq><inverseq>qni6yLGiI0ZsSabZutS+OI+qF8paE4+CMBQxj6BOt/35msm+L8kc+sqgsghy/MoZDnlt9e/lIwc2YBOAZusMCg==</inverseq><d>HTAvSnyJdSu/N2txpcZbvmbe4JvCgqcmcpSealHqpxGziV3W1rZI3O/UeATb1nZD6A0JsO/l0LWz6XM7+gHE0/jkq6LTjvLlN0ob4VtrslGmMJ6ISbiaGq4tL/rsOl3bRRJVc4bNEqDH6IgeUdRjgDe3ZVZeYzsVNHK8KYBWogk=</d></rsakeyvalue>\"
RSA.FromXmlString(publicprivatekeyxml)
Dim decryptedKey As Byte() = RSA.Decrypt(getencryptedkey, False)
pwd = System.Text.ASCIIEncoding.Unicode.GetString(decryptedKey)
Dim dk As Byte() = Nothing
Dim div As Byte() = Nothing
crm.getKeysFromPassword(pwd, dk, div)
cryptoKey = dk
cryptoIV = div
'#End Region
Dim ext As String = Path.GetExtension(encName).ToLower()
If ext <> \".enc\" Then
' MessageBox.Show(\"Please Enter correct File\");
Return
End If
Dim dncName As String = Path.GetDirectoryName(encName) & \"\\" & Path.GetFileNameWithoutExtension(encName)
dncName = originalPath & \"\Decrypted.dnc\"
Try
If crm.DecryptData(encName, dncName, cryptoKey, cryptoIV) Then
Dim fi As New FileInfo(encName)
Dim fi2 As New FileInfo(dncName)
If (fi.Attributes And FileAttributes.[ReadOnly]) = FileAttributes.[ReadOnly] Then
fi.Attributes = fi.Attributes And Not FileAttributes.[ReadOnly]
End If
'copy creation and modification time
fi2.CreationTime = fi.CreationTime
fi2.LastWriteTime = fi.LastWriteTime
'delete encrypted file
' MessageBox.Show(\"File Decrypted\");
File.Delete(encName)
' MessageBox.Show(\"The file can't be decrypted - probably wrong password\");
Else
End If
'MessageBox.Show(ex.Message);
Catch ex As CryptographicException
' MessageBox.Show(ex.Message);
Catch ex As IOException
'i.e. readonly
' MessageBox.Show(ex.Message);
Catch ex As UnauthorizedAccessException
End Try
'MessageBox.Show(ex.Message);
Catch ex As Exception
End Try
End Sub
Public Function ReadEncryptFileToBuffer(ByVal fileSource As String) As String
Const PROVIDER_RSA_FULL As Integer = 1
Const CONTAINER_NAME As String = \"KeyContainer\"
Dim cspParams As CspParameters
cspParams = New CspParameters(PROVIDER_RSA_FULL)
cspParams.KeyContainerName = CONTAINER_NAME
cspParams.Flags = CspProviderFlags.UseMachineKeyStore
cspParams.ProviderName = \"Microsoft Strong C ryptographic Provider\"
Dim buffer As String = \"\"
testHeader = System.Text.Encoding.ASCII.GetBytes(\"testing header\")
testHeaderString = BitConverter.ToString(testHeader)
Dim originalPath As String = fileSource.Substring(0, fileSource.LastIndexOf(\"\\"))
Dim alldata As Byte() = File.ReadAllBytes(fileSource)
Dim getencryptedkey As Byte() = New Byte(127) {}
Dim data As Byte() = New Byte(alldata.Length - 129) {}
Try
Dim current As DateTime = DateTime.Now
Dim encName As String = fileSource & \"data\" & \".enc\"
Dim RSA As New RSACryptoServiceProvider(cspParams)
For k As Integer = 0 To alldata.Length - 129
data(k) = alldata(k)
Next
Dim i As Integer = alldata.Length - 128, j As Integer = 0
While i < alldata.Length
getencryptedkey(j) = alldata(i)
i += 1
j += 1
End While
Using bw As New BinaryWriter(File.Create(encName))
bw.Write(data)
bw.Close()
End Using
Dim publicprivatekeyxml As String = \"<rsakeyvalue><modulus>qwJYZm7ECFuktmofbVkm4J1kRf/L9521P70DaJhw/JNCwmCVItuaGEZWUlPZoMB6Q05Da7yYhkhVTHb ybyxTcSMeQBsXb8jVqm3HWN3Quy8XITjGkuCsP8AijmXVV2RWa8T1oklN5SZfdaprue0ZWLjUFcZff5eay4igWjXpmVE=</modulus><exponent>AQAB</exponent><p>6RxsBsub9tG0hwRS92vLjxUuBF5adjifmLvB3cr1RnwcgX7EoVWiw/UPBzfiF/B9ZYkvu5EnL3ZTZ0Uae0eDrw==</p><q>u8zniy7nrMDyZHgnMR1yaL/w/bw0jPelo9t3h/1yOetFBRDYKGQQc3njLl/I8NIm0grug+x43vSOprh65m7y/w==</q><dp>ooqX5JEaehq1FyPzuePm9yjcgl1MFHzdA8F/p2g6aGBn+/9pmdk9egeo5+6WbvzYYvEqYE4RFa4a77omgelWrw==</dp><dq>lcTGjzgb6KiDZl5wGvo56JHSNfhnDFjfTzrSK7CS7N/UzkJtsGCEwiLda3lV/cAK142CQ9FNX7k3HnyW/rhSrw==</dq><inverseq>qni6yLGiI0ZsSabZutS+OI+qF8paE4+CMBQxj6BOt/35msm+L8kc+sqgsghy/MoZDnlt9e/lIwc2YBOAZusMCg==</inverseq><d>HTAvSnyJdSu/N2txpcZbvmbe4JvCgqcmcpSealHqpxGziV3W1rZI3O/UeATb1nZD6A0JsO/l0LWz6XM7+gHE0/jkq6LTjvLlN0ob4VtrslGmMJ6ISbiaGq4tL/rsOl3bRRJVc4bNEqDH6IgeUdRjgDe3ZVZeYzsVNHK8KYBWogk=</d></rsakeyvalue>\"
RSA.FromXmlString(publicprivatekeyxml)
Dim decryptedKey As Byte() = RSA.Decrypt(getencryptedkey, False)
pwd = System.Text.ASCIIEncoding.Unicode.GetString(decryptedKey)
Dim dk As Byte() = Nothing
Dim div As Byte() = Nothing
crm.getKeysFromPassword(pwd, dk, div)
cryptoKey = dk
cryptoIV = div
File.Delete(encName)
Dim ext As String = Pat h.GetExtension(encName).ToLower()
If ext <> \".enc\" Then
' MessageBox.Show(\"Please Enter correct File\");
Return \"\"
End If
Catch
End Try
Dim RijndaelCipher As RijndaelManaged
Dim cryptoStream As CryptoStream = Nothing
Dim memoryStr eam As MemoryStream = Nothing
Dim fsIn As FileStream = Nothing
Dim reader As StreamReader = Nothing, cryptoStreamReader As StreamReader = Nothing
Dim decryptText As [String] = Nothing
Try
RijndaelCipher = New RijndaelManaged()
RijndaelCipher.Mode = CipherMode.CBC
RijndaelCipher.KeySize = 256
RijndaelCipher.BlockSize = 128
RijndaelCipher.Padding = PaddingMode.PKCS7
fsIn = New FileStream(fileSource, FileMode.Open, FileAccess.Read)
reader = New StreamReader(fsIn, Encoding.[Default])
Dim cipherText As [String] = reader.ReadToEnd()
Dim cipherByte As Byte() = System.Text.Encoding.[Default].GetBytes(cipherText)
Dim decryptor As ICryptoTransform = RijndaelCipher.CreateDecrypt or(cryptoKey, cryptoIV)
memoryStream = New MemoryStream(data)
cryptoStream = New CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read)
cryptoStreamReader = New StreamReader(cryptoStream)
decryptText = cryptoStreamReader.ReadToEnd()
buffer = decryptText.Substring(14)
Return buffer
Catch ex As FileNotFoundException
If ex.FileName.CompareTo(fileSource) = 0 AndAlso Log.logPermission = True Then
Dim writer As New StreamWriter(Log.logFileLocation)
writer.WriteLine(ex.Message & \" i.e. Input file for decryption Buffer\")
writer.Close()
End If
Catch ex As Exception
If Log.logPermission = True Then
Dim writer As New StreamWriter(Log.logFileLocation)
writer.WriteLine(ex.Message & \"i.e. During Reading Encrypted File to Decrypted Buffer\")
writer.Close()
End If
Finally
If reader IsNot Nothing Then
reader.Close()
End If
If cryptoStreamReader IsNot Nothing Then
cryptoStreamReader.Close()
End If
If cryptoStream IsNot Nothing Then
cryptoStream.Close()
End If
If memoryStream IsNot Nothing Then
memoryStream.Close()
End If
If fsIn IsNot Nothing Then
fsIn.Close()
End If
End Try
buffer = decryptText
Return buffer
End Function
Public Sub BufferToEncryptFile(ByVal buffer As String, ByVal folderPath As String)
'sunil code
Const PROVIDER_RSA_FULL As Integer = 1
Const CONTAINER_NAME As String = \"KeyContainer\"
Dim cspPara ms As CspParameters
cspParams = New CspParameters(PROVIDER_RSA_FULL)
cspParams.KeyContainerName = CONTAINER_NAME
cspParams.Flags = CspProviderFlags.UseMachineKeyStore
cspParams.ProviderName = \"Microsoft Strong Cryptographic Provider\"
getPassword()
Dim originalPath As String = folderPath
Try
Dim current As DateTime = DateTime.Now
Dim RSA As New RSACryptoServiceProvider(cspParams)
Dim keyToEncrypt As Byte()
Dim encryptedKey As Byte()
Dim origName As String = folderPath
Dim encName As String = origName & \".enc\"
Try
crm.EncryptBuffer(buffer, originalPath & \"\EncodedBuffer.enc\", cryptoKey, cryptoIV)
Dim data As Byte() = File.ReadAllBytes(originalPath & \"\EncodedBuffer.enc\")
'delete original file
File.Delete(originalPath & \"\EncodedBuffer.enc\")
Dim publicprivatexml As String = RSA.ToXmlString(True)
keyToEncrypt = System.Text.ASCIIEncoding.Unicode.GetBytes(pwd)
encryptedKey = RSA.Encrypt(keyToEncrypt, False)
Using bw As New BinaryWriter(File.Create(originalPath & \"\Encrypted.enc\"))
'Write data
bw.Seek(0, SeekOrigin.Begin)
bw.Write(data)
bw.Write(encryptedKey)
bw.Close()
End Using
Catch ex As CryptographicException
Catch ex As IOException
Catch ex As UnauthorizedAccessException
End Try
Catch ex As Exception
End Try
End Sub
End Class
End NamespaceYou have to rewrite by hand. There is no conversion tool to go backwards, there are no namespaces in VB6 and you better know VB6 and your .NET code inside and out.
You’re going to be doing a ton of PInvoking of Win32 functions in VB6 to rewrite this code.
No, nobody is going to do this for you and frankly, using VB6 is not a \"requirement\". It’s incredibly stupid in this day and age to do any new development in VB6 as VB6 has been officially dead for quite a number of years now.
Imports System.Collections.Generic
Imports System.Linq
Imports System.Text
Imports System.Security.Cryptography
Imports System.IO
Namespace RijndaelEncDec
Public Enum CryptoEventType
Message
FileProgress
End Enum
Public Class CryptoEventArgs
Inherits EventArgs
Private m_type As CryptoEventType
Private m_message As String
Private m_fileLength As Integer
Private m_filePosition As Integer
Public Sub New(ByVal message As String)
m_type = CryptoEventType.Message
Me.m_message = message
End Sub
Public Sub New(ByVal fileName As String, ByVal fileLength As Integer, ByVal filePosition As Integer)
m_type = CryptoEventType.FileProgress
Me.m_fileLength = fileLength
Me.m_filePosition = filePosition
m_message = fileName
End Sub
Public ReadOnly Property Type() As CryptoEventType
Get
Return m_type
End Get
End Property
Public ReadOnly Property Message() As String
Get
Return m_message
End Get
End Property
Public ReadOnly Property FileName() As String
Get
Return m_message
End Get
End Property
Public ReadOnly Property FileLength() As Integer
Get
Return m_fileLength
End Get
End Property
Public ReadOnly Property FilePosition() As Integer
Get
Return m_filePosition
End Get
End Property
End Class
Public Delegate Sub cryptoEventHandler(ByVal sender As Object, ByVal e As CryptoEventArgs)
''' <summary>
'''
''' </summary>
Public Class CryptoManager
Private testHeader As Byte() = Nothing
'used to verify if decryption succeeded
Private testHeaderString As String = Nothing
Public Sub New()
testHeader = System.Text.Encoding.ASCII.GetBytes("testing header")
testHeaderString = BitConverter.ToString(testHeader)
End Sub
Public Sub getKeysFromPassword(ByVal pass As String, ByRef rijnKey As Byte(), ByRef rijnIV As Byte())
Dim salt As Byte() = System.Text.Encoding.ASCII.GetBytes("System.Text.Encoding.ASCII.GetBytes")
Dim pb As New PasswordDeriveBytes(pass, salt)
rijnKey = pb.GetBytes(32)
rijnIV = pb.GetBytes(16)
End Sub
Const bufLen As Integer = 4096
Public Sub EncryptData(ByVal inName As [String], ByVal outName As [String], ByVal rijnKey As Byte(), ByVal rijnIV As Byte())
Dim fin As FileStream = Nothing
Dim fout As FileStream = Nothing
Dim encStream As CryptoStream = Nothing
Try
'Create the file streams to handle the input and output files.
fin = New FileStream(inName, FileMode.Open, FileAccess.Read)
fout = New FileStream(outName, FileMode.Create, FileAccess.Write)
'Create variables to help with read and write.
Dim bin As Byte() = New Byte(bufLen - 1) {}
'This is intermediate storage for the encryption.
Dim rdlen As Long = 0
'This is the total number of bytes written.
Dim totlen As Long = fin.Length
'This is the total length of the input file.
Dim len As Integer
'This is the number of bytes to be written at a time.
Dim rijn As New RijndaelManaged()
rijn.Mode = CipherMode.CBC
rijn.KeySize = 256
rijn.BlockSize = 128
rijn.Padding = PaddingMode.PKCS7
encStream = New CryptoStream(fout, rijn.CreateEncryptor(rijnKey, rijnIV), CryptoStreamMode.Write)
'zakoduj testowy fragment
encStream.Write(testHeader, 0, testHeader.Length)
'Read from the input file, then encrypt and write to the output file.
While True
len = fin.Read(bin, 0, bufLen)
If len = 0 Then
Exit While
End If
encStream.Write(bin, 0, len)
rdlen += len
End While
Finally
If encStream IsNot Nothing Then
encStream.Close()
End If
If fout IsNot Nothing Then
fout.Close()
End If
If fin IsNot Nothing Then
fin.Close()
End If
End Try
End Sub
Public Sub EncryptBuffer(ByVal buffer As [String], ByVal outName As [String], ByVal rijnKey As Byte(), ByVal rijnIV As Byte())
Dim fin As FileStream = Nothing
Dim fout As FileStream = Nothing
Dim encStream As CryptoStream = Nothing
Try
'Create the file streams to handle the input and output files.
' fin = new FileStream((inName, FileMode.Open, FileAccess.Read);
Dim byteArray As Byte() = Encoding.ASCII.GetBytes(buffer)
Dim mem As New MemoryStream(byteArray)
fout = New FileStream(outName, FileMode.Create, FileAccess.Write)
'Create variables to help with read and write.
Dim bin As Byte() = New Byte(bufLen - 1) {}
'This is intermediate storage for the encryption.
Dim rdlen As Long = 0
'This is the total number of bytes written.
Dim totlen As Long = mem.Length
'This is the total length of the input file.
Dim len As Integer
'This is the number of bytes to be written at a time.
Dim rijn As New RijndaelManaged()
rijn.Mode = CipherMode.CBC
rijn.KeySize = 256
rijn.BlockSize = 128
rijn.Padding = PaddingMode.PKCS7
encStream = New CryptoStream(fout, rijn.CreateEncryptor(rijnKey, rijnIV), CryptoStreamMode.Write)
'zakoduj testowy fragment
encStream.Write(testHeader, 0, testHeader.Length)
'Read from the input file, then encrypt and write to the output file.
While True
len = mem.Read(bin, 0, bufLen)
If len = 0 Then
Exit While
End If
encStream.Write(bin, 0, len)
rdlen += len
End While
Finally
If encStream IsNot Nothing Then
encStream.Close()
End If
If fout IsNot Nothing Then
fout.Close()
End If
If fin IsNot Nothing Then
fin.Close()
End If
End Try
End Sub
Public Function DecryptData(ByVal inName As [String], ByVal outName As [String], ByVal rijnKey As Byte(), ByVal rijnIV As Byte()) As Boolean
'Create the file streams to handle the input and output files.
Dim fin As FileStream = Nothing
Dim fout As FileStream = Nothing
Dim decStream As CryptoStream = Nothing
Try
fin = New FileStream(inName, FileMode.Open, FileAccess.Read)
'Create variables to help with read and write.
Dim bin As Byte() = New Byte(bufLen - 1) {}
'This is intermediate storage for the encryption.
Dim rdlen As Long = 0
'This is the total number of bytes written.
Dim totlen As Long = fin.Length
'This is the total length of the input file.
Dim len As Integer
'This is the number of bytes to be written at a time.
Dim rijn As New RijndaelManaged()
rijn.Mode = CipherMode.CBC
rijn.KeySize = 256
rijn.BlockSize = 128
rijn.Padding = PaddingMode.PKCS7
'DES ds = new DESCryptoServiceProvider();
decStream = New CryptoStream(fin, rijn.CreateDecryptor(rijnKey, rijnIV), CryptoStreamMode.Read)
'odkoduj testowy fragment
Dim test As Byte() = New Byte(testHeader.Length - 1) {}
decStream.Read(test, 0, testHeader.Length)
If BitConverter.ToString(test) <> testHeaderString Then
decStream.Clear()
decStream = Nothing
Return False
End If
'create output file
fout = New FileStream(outName, FileMode.Create, FileAccess.Write)
'Read from the encrypted file and write dercypted data
While True
len = decStream.Read(bin, 0, bufLen)
If len = 0 Then
Exit While
End If
fout.Write(bin, 0, len)
rdlen += len
End While
Return True
Finally
If decStream IsNot Nothing Then
decStream.Close()
End If
If fout IsNot Nothing Then
fout.Close()
End If
If fin IsNot Nothing Then
fin.Close()
End If
End Try
End Function
End Class
Public Class Log
Public Shared logPermission As Boolean = True
Public Shared logFileLocation As [String] = "D:\C#EncDecLogFile.txt"
End Class
Public Class Rijndael
Private pwd As String = ""
Private testHeader As Byte() = Nothing
'used to verify if decryption succeeded
Private testHeaderString As String = Nothing
Private cryptoKey As Byte(), cryptoIV As Byte()
Private crm As New CryptoManager()
Public Sub getPassword()
Try
pwd = "1234567890"
'get keys from password
Dim dk As Byte() = Nothing
Dim div As Byte() = Nothing
crm.getKeysFromPassword(pwd, dk, div)
cryptoKey = dk
cryptoIV = div
Catch ex As FormatException
Return
End Try
End Sub
Public Sub Encryption(ByVal filePath As String)
'sunil code with RSA
getPassword()
Const PROVIDER_RSA_FULL As Integer = 1
Const CONTAINER_NAME As String = "KeyContainer"
Dim cspParams As CspParameters
cspParams = New CspParameters(PROVIDER_RSA_FULL)
cspParams.KeyContainerName = CONTAINER_NAME
cspParams.Flags = CspProviderFlags.UseMachineKeyStore
cspParams.ProviderName = "Microsoft Strong Cryptographic Provider"
Dim originalPath As String = filePath.Substring(0, filePath.LastIndexOf("\"))
Try
Dim current As DateTime = DateTime.Now
Dim RSA As New RSACryptoServiceProvider(cspParams)
Dim keyToEncrypt As Byte()
Dim encryptedKey As Byte()
Dim origName As String = filePath
Dim encName As String = origName & ".enc"
Try
crm.EncryptData(origName, encName, cryptoKey, cryptoIV)
Dim fi As New FileInfo(origName)
Dim fi2 As New FileInfo(encName)
'remove readonly attribute
If (fi.Attributes And FileAttributes.[ReadOnly]) = FileAttributes.[ReadOnly] Then
fi.Attributes = fi.Attributes And Not FileAttributes.[ReadOnly]
End If
'copy creation and modification time
fi2.CreationTime = fi.CreationTime
fi2.LastWriteTime = fi.LastWriteTime
fi2.Attributes = FileAttributes.Normal Or FileAttributes.Archive
Dim data As Byte() = File.ReadAllBytes(encName)
'delete original file
File.Delete(encName)
'#Region "write RSA (Public Private) key in xml files"
Dim publicprivatexml As String = RSA.ToXmlString(True)
'#End Region
keyToEncrypt = System.Text.ASCIIEncoding.Unicode.GetBytes(pwd)
encryptedKey = RSA.Encrypt(keyToEncrypt, False)
'using (BinaryWriter bw = new BinaryWriter(File.Create(origName + " " + current.Date.Day.ToString() + current.Date.Month.ToString() + current.Date.Year.ToString() + current.TimeOfDay.Duration().Hours.ToString() + current.TimeOfDay.Duration().Minutes.ToString() + current.TimeOfDay.Duration().Seconds.ToString() + ".enc")))
Using bw As New BinaryWriter(File.Create(originalPath & "\Encrypted.enc"))
'Write data
bw.Seek(0, SeekOrigin.Begin)
bw.Write(data)
bw.Write(encryptedKey)
bw.Close()
'MessageBox.Show("File Encrypted");
End Using
' MessageBox.Show(ex.Message);
Catch ex As CryptographicException
'MessageBox.Show(ex.Message);
Catch ex As IOException
'i.e. readonly
' MessageBox.Show(ex.Message);
Catch ex As UnauthorizedAccessException
End Try
'MessageBox.Show(ex.Message);
Catch ex As Exception
End Try
End Sub
Public Sub Decryption(ByVal filePath As String)
'sunil code with RSA
Const PROVIDER_RSA_FULL As Integer = 1
Const CONTAINER_NAME As String = "KeyContainer"
Dim cspParams As CspParameters
cspParams = New CspParameters(PROVIDER_RSA_FULL)
cspParams.KeyContainerName = CONTAINER_NAME
cspParams.Flags = CspProviderFlags.UseMachineKeyStore
cspParams.ProviderName = "Microsoft Strong Cryptographic Provider"
Dim originalPath As String = filePath.Substring(0, filePath.LastIndexOf("\"))
Try
Dim current As DateTime = DateTime.Now
Dim encName As String = filePath & "data" & ".enc"
Dim RSA As New RSACryptoServiceProvider(cspParams)
'#Region "Seperate key and data"
Dim alldata As Byte() = File.ReadAllBytes(filePath)
Dim getencryptedkey As Byte() = New Byte(127) {}
Dim data As Byte() = New Byte(alldata.Length - 129) {}
For k As Integer = 0 To alldata.Length - 129
data(k) = alldata(k)
Next
Dim i As Integer = alldata.Length - 128, j As Integer = 0
While i < alldata.Length
getencryptedkey(j) = alldata(i)
i += 1
j += 1
End While
Using bw As New BinaryWriter(File.Create(encName))
bw.Write(data)
bw.Close()
End Using
Dim publicprivatekeyxml As String = "<rsakeyvalue><modulus>qwJYZm7ECFuktmofbVkm4J1kRf/L9521P70DaJhw/JNCwmCVItuaGEZWUlPZoMB6Q05Da7yYhkhVTHbybyxTcSMeQBsXb8jVqm3HWN3Quy8XITjGkuCsP8AijmXVV2RWa8T1oklN5SZfdaprue0ZWLjUFcZff5eay4igWjXpmVE=</modulus><exponent>AQAB</exponent><p>6RxsBsub9tG0hwRS92vLjxUuBF5adjifmLvB3cr1RnwcgX7EoVWiw/UPBzfiF/B9ZYkvu5EnL3ZTZ0Uae0eDrw==</p><q>u8zniy7nrMDyZHgnMR1yaL/w/bw0jPelo9t3h/1yOetFBRDYKGQQc3njLl/I8NIm0grug+x43vSOprh65m7y/w==</q><dp>ooqX5JEaehq1FyPzuePm9yjcgl1MFHzdA8F/p2g6aGBn+/9pmdk9egeo5+6WbvzYYvEqYE4RFa4a77omgelWrw==</dp><dq>lcTGjzgb6KiDZl5wGvo56JHSNfhnDFjfTzrSK7CS7N/UzkJtsGCEwiLda3lV/cAK142CQ9FNX7k3HnyW/rhSrw==</dq><inverseq>qni6yLGiI0ZsSabZutS+OI+qF8paE4+CMBQxj6BOt/35msm+L8kc+sqgsghy/MoZDnlt9e/lIwc2YBOAZusMCg==</inverseq><d>HTAvSnyJdSu/N2txpcZbvmbe4JvCgqcmcpSealHqpxGziV3W1rZI3O/UeATb1nZD6A0JsO/l0LWz6XM7+gHE0/jkq6LTjvLlN0ob4VtrslGmMJ6ISbiaGq4tL/rsOl3bRRJVc4bNEqDH6IgeUdRjgDe3ZVZeYzsVNHK8KYBWogk=</d></rsakeyvalue>"
RSA.FromXmlString(publicprivatekeyxml)
Dim decryptedKey As Byte() = RSA.Decrypt(getencryptedkey, False)
pwd = System.Text.ASCIIEncoding.Unicode.GetString(decryptedKey)
Dim dk As Byte() = Nothing
Dim div As Byte() = Nothing
crm.getKeysFromPassword(pwd, dk, div)
cryptoKey = dk
cryptoIV = div
'#End Region
Dim ext As String = Path.GetExtension(encName).ToLower()
If ext <> ".enc" Then
' MessageBox.Show("Please Enter correct File");
Return
End If
Dim dncName As String = Path.GetDirectoryName(encName) & "\" & Path.GetFileNameWithoutExtension(encName)
dncName = originalPath & "\Decrypted.dnc"
Try
If crm.DecryptData(encName, dncName, cryptoKey, cryptoIV) Then
Dim fi As New FileInfo(encName)
Dim fi2 As New FileInfo(dncName)
If (fi.Attributes And FileAttributes.[ReadOnly]) = FileAttributes.[ReadOnly] Then
fi.Attributes = fi.Attributes And Not FileAttributes.[ReadOnly]
End If
'copy creation and modification time
fi2.CreationTime = fi.CreationTime
fi2.LastWriteTime = fi.LastWriteTime
'delete encrypted file
' MessageBox.Show("File Decrypted");
File.Delete(encName)
' MessageBox.Show("The file can't be decrypted - probably wrong password");
Else
End If
'MessageBox.Show(ex.Message);
Catch ex As CryptographicException
' MessageBox.Show(ex.Message);
Catch ex As IOException
'i.e. readonly
' MessageBox.Show(ex.Message);
Catch ex As UnauthorizedAccessException
End Try
'MessageBox.Show(ex.Message);
Catch ex As Exception
End Try
End Sub
Public Function ReadEncryptFileToBuffer(ByVal fileSource As String) As String
Const PROVIDER_RSA_FULL As Integer = 1
Const CONTAINER_NAME As String = "KeyContainer"
Dim cspParams As CspParameters
cspParams = New CspParameters(PROVIDER_RSA_FULL)
cspParams.KeyContainerName = CONTAINER_NAME
cspParams.Flags = CspProviderFlags.UseMachineKeyStore
cspParams.ProviderName = "Microsoft Strong Cryptographic Provider"
Dim buffer As String = ""
testHeader = System.Text.Encoding.ASCII.GetBytes("testing header")
testHeaderString = BitConverter.ToString(testHeader)
Dim originalPath As String = fileSource.Substring(0, fileSource.LastIndexOf("\"))
Dim alldata As Byte() = File.ReadAllBytes(fileSource)
Dim getencryptedkey As Byte() = New Byte(127) {}
Dim data As Byte() = New Byte(alldata.Length - 129) {}
Try
Dim current As DateTime = DateTime.Now
Dim encName As String = fileSource & "data" & ".enc"
Dim RSA As New RSACryptoServiceProvider(cspParams)
For k As Integer = 0 To alldata.Length - 129
data(k) = alldata(k)
Next
Dim i As Integer = alldata.Length - 128, j As Integer = 0
While i < alldata.Length
getencryptedkey(j) = alldata(i)
i += 1
j += 1
End While
Using bw As New BinaryWriter(File.Create(encName))
bw.Write(data)
bw.Close()
End Using
Dim publicprivatekeyxml As String = "<rsakeyvalue><modulus>qwJYZm7ECFuktmofbVkm4J1kRf/L9521P70DaJhw/JNCwmCVItuaGEZWUlPZoMB6Q05Da7yYhkhVTHbybyxTcSMeQBsXb8jVqm3HWN3Quy8XITjGkuCsP8AijmXVV2RWa8T1oklN5SZfdaprue0ZWLjUFcZff5eay4igWjXpmVE=</modulus><exponent>AQAB</exponent><p>6RxsBsub9tG0hwRS92vLjxUuBF5adjifmLvB3cr1RnwcgX7EoVWiw/UPBzfiF/B9ZYkvu5EnL3ZTZ0Uae0eDrw==</p><q>u8zniy7nrMDyZHgnMR1yaL/w/bw0jPelo9t3h/1yOetFBRDYKGQQc3njLl/I8NIm0grug+x43vSOprh65m7y/w==</q><dp>ooqX5JEaehq1FyPzuePm9yjcgl1MFHzdA8F/p2g6aGBn+/9pmdk9egeo5+6WbvzYYvEqYE4RFa4a77omgelWrw==</dp><dq>lcTGjzgb6KiDZl5wGvo56JHSNfhnDFjfTzrSK7CS7N/UzkJtsGCEwiLda3lV/cAK142CQ9FNX7k3HnyW/rhSrw==</dq><inverseq>qni6yLGiI0ZsSabZutS+OI+qF8paE4+CMBQxj6BOt/35msm+L8kc+sqgsghy/MoZDnlt9e/lIwc2YBOAZusMCg==</inverseq><d>HTAvSnyJdSu/N2txpcZbvmbe4JvCgqcmcpSealHqpxGziV3W1rZI3O/UeATb1nZD6A0JsO/l0LWz6XM7+gHE0/jkq6LTjvLlN0ob4VtrslGmMJ6ISbiaGq4tL/rsOl3bRRJVc4bNEqDH6IgeUdRjgDe3ZVZeYzsVNHK8KYBWogk=</d></rsakeyvalue>"
RSA.FromXmlString(publicprivatekeyxml)
Dim decryptedKey As Byte() = RSA.Decrypt(getencryptedkey, False)
pwd = System.Text.ASCIIEncoding.Unicode.GetString(decryptedKey)
Dim dk As Byte() = Nothing
Dim div As Byte() = Nothing
crm.getKeysFromPassword(pwd, dk, div)
cryptoKey = dk
cryptoIV = div
File.Delete(encName)
Dim ext As String = Path.GetExtension(encName).ToLower()
If ext <> ".enc" Then
' MessageBox.Show("Please Enter correct File");
Return ""
End If
Catch
End Try
Dim RijndaelCipher As RijndaelManaged
Dim cryptoStream As CryptoStream = Nothing
Dim memoryStream As MemoryStream = Nothing
Dim fsIn As FileStream = Nothing
Dim reader As StreamReader = Nothing, cryptoStreamReader As StreamReader = Nothing
Dim decryptText As [String] = Nothing
Try
RijndaelCipher = New RijndaelManaged()
RijndaelCipher.Mode = CipherMode.CBC
RijndaelCipher.KeySize = 256
RijndaelCipher.BlockSize = 128
RijndaelCipher.Padding = PaddingMode.PKCS7
fsIn = New FileStream(fileSource, FileMode.Open, FileAccess.Read)
reader = New StreamReader(fsIn, Encoding.[Default])
Dim cipherText As [String] = reader.ReadToEnd()
Dim cipherByte As Byte() = System.Text.Encoding.[Default].GetBytes(cipherText)
Dim decryptor As ICryptoTransform = RijndaelCipher.CreateDecryptor(cryptoKey, cryptoIV)
memoryStream = New MemoryStream(data)
cryptoStream = New CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read)
cryptoStreamReader = New StreamReader(cryptoStream)
decryptText = cryptoStreamReader.ReadToEnd()
buffer = decryptText.Substring(14)
Return buffer
Catch ex As FileNotFoundException
If ex.FileName.CompareTo(fileSource) = 0 AndAlso Log.logPermission = True Then
Dim writer As New StreamWriter(Log.logFileLocation)
writer.WriteLine(ex.Message & " i.e. Input file for decryption Buffer")
writer.Close()
End If
Catch ex As Exception
If Log.logPermission = True Then
Dim writer As New StreamWriter(Log.logFileLocation)
writer.WriteLine(ex.Message & "i.e. During Reading Encrypted File to Decrypted Buffer")
writer.Close()
End If
Finally
If reader IsNot Nothing Then
reader.Close()
End If
If cryptoStreamReader IsNot Nothing Then
cryptoStreamReader.Close()
End If
If cryptoStream IsNot Nothing Then
cryptoStream.Close()
End If
If memoryStream IsNot Nothing Then
memoryStream.Close()
End If
If fsIn IsNot Nothing Then
fsIn.Close()
End If
End Try
buffer = decryptText
Return buffer
End Function
Public Sub BufferToEncryptFile(ByVal buffer As String, ByVal folderPath As String)
'sunil code
Const PROVIDER_RSA_FULL As Integer = 1
Const CONTAINER_NAME As String = "KeyContainer"
Dim cspParams As CspParameters
cspParams = New CspParameters(PROVIDER_RSA_FULL)
cspParams.KeyContainerName = CONTAINER_NAME
cspParams.Flags = CspProviderFlags.UseMachineKeyStore
cspParams.ProviderName = "Microsoft Strong Cryptographic Provider"
getPassword()
Dim originalPath As String = folderPath
Try
Dim current As DateTime = DateTime.Now
Dim RSA As New RSACryptoServiceProvider(cspParams)
Dim keyToEncrypt As Byte()
Dim encryptedKey As Byte()
Dim origName As String = folderPath
Dim encName As String = origName & ".enc"
Try
crm.EncryptBuffer(buffer, originalPath & "\EncodedBuffer.enc", cryptoKey, cryptoIV)
Dim data As Byte() = File.ReadAllBytes(originalPath & "\EncodedBuffer.enc")
'delete original file
File.Delete(originalPath & "\EncodedBuffer.enc")
Dim publicprivatexml As String = RSA.ToXmlString(True)
keyToEncrypt = System.Text.ASCIIEncoding.Unicode.GetBytes(pwd)
encryptedKey = RSA.Encrypt(keyToEncrypt, False)
Using bw As New BinaryWriter(File.Create(originalPath & "\Encrypted.enc"))
'Write data
bw.Seek(0, SeekOrigin.Begin)
bw.Write(data)
bw.Write(encryptedKey)
bw.Close()
End Using
Catch ex As CryptographicException
Catch ex As IOException
Catch ex As UnauthorizedAccessException
End Try
Catch ex As Exception
End Try
End Sub
End Class
End Namespace
You have to rewrite by hand. There is no conversion tool to go backwards, there are no namespaces in VB6 and you better know VB6 and your .NET code inside and out.
You're going to be doing a ton of PInvoking of Win32 functions in VB6 to rewrite this code.
No, nobody is going to do this for you and frankly, using VB6 is not a "requirement". It's incredibly stupid in this day and age to do any new development in VB6 as VB6 has been officially dead for quite a number of years now.
