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| Option Explicit
' ....----==== API Declarations ====----....
Private Declare Function CryptAcquireContext Lib "advapi32.dll" _
Alias "CryptAcquireContextA" ( _
ByRef phProv As Long, _
ByVal pszContainer As String, _
ByVal pszProvider As String, _
ByVal dwProvType As Long, _
ByVal dwFlags As Long) As Long
Private Declare Function CryptReleaseContext Lib "advapi32.dll" ( _
ByVal hProv As Long, _
ByVal dwFlags As Long) As Long
Private Declare Function CryptCreateHash Lib "advapi32.dll" ( _
ByVal hProv As Long, _
ByVal Algid As Long, _
ByVal hKey As Long, _
ByVal dwFlags As Long, _
ByRef phHash As Long) As Long
Private Declare Function CryptDestroyHash Lib "advapi32.dll" ( _
ByVal hHash As Long) As Long
Private Declare Function CryptHashData Lib "advapi32.dll" ( _
ByVal hHash As Long, _
pbData As Any, _
ByVal dwDataLen As Long, _
ByVal dwFlags As Long) As Long
Private Declare Function CryptDeriveKey Lib "advapi32.dll" ( _
ByVal hProv As Long, _
ByVal Algid As Long, _
ByVal hBaseData As Long, _
ByVal dwFlags As Long, _
ByRef phKey As Long) As Long
Private Declare Function CryptDestroyKey Lib "advapi32.dll" ( _
ByVal hKey As Long) As Long
Private Declare Function CryptEncrypt Lib "advapi32.dll" ( _
ByVal hKey As Long, _
ByVal hHash As Long, _
ByVal Final As Long, _
ByVal dwFlags As Long, _
pbData As Any, _
ByRef pdwDataLen As Long, _
ByVal dwBufLen As Long) As Long
Private Declare Function CryptDecrypt Lib "advapi32.dll" ( _
ByVal hKey As Long, _
ByVal hHash As Long, _
ByVal Final As Long, _
ByVal dwFlags As Long, _
pbData As Any, _
ByRef pdwDataLen As Long) As Long
Private Declare Sub MoveMemory Lib "kernel32" _
Alias "RtlMoveMemory" ( _
dest As Any, _
Src As Any, _
ByVal Ln As Long)
Private Const PROV_RSA_FULL = 1
Private Const CRYPT_NEWKEYSET = &H8
Private Const ALG_CLASS_HASH = 32768
Private Const ALG_CLASS_DATA_ENCRYPT = 24576&
Private Const ALG_TYPE_ANY = 0
Private Const ALG_TYPE_BLOCK = 1536&
Private Const ALG_TYPE_STREAM = 2048&
Private Const ALG_SID_MD2 = 1
Private Const ALG_SID_MD4 = 2
Private Const ALG_SID_MD5 = 3
Private Const ALG_SID_SHA1 = 4
Private Const ALG_SID_DES = 1
Private Const ALG_SID_3DES = 3
Private Const ALG_SID_RC2 = 2
Private Const ALG_SID_RC4 = 1
Enum HashAlgorithm
MD2 = ALG_CLASS_HASH Or ALG_TYPE_ANY Or ALG_SID_MD2
MD4 = ALG_CLASS_HASH Or ALG_TYPE_ANY Or ALG_SID_MD4
MD5 = ALG_CLASS_HASH Or ALG_TYPE_ANY Or ALG_SID_MD5
SHA1 = ALG_CLASS_HASH Or ALG_TYPE_ANY Or ALG_SID_SHA1
End Enum
Enum encAlgorithm
DES = ALG_CLASS_DATA_ENCRYPT Or ALG_TYPE_BLOCK Or ALG_SID_DES
[3DES] = ALG_CLASS_DATA_ENCRYPT Or ALG_TYPE_BLOCK Or ALG_SID_3DES
RC2 = ALG_CLASS_DATA_ENCRYPT Or ALG_TYPE_BLOCK Or ALG_SID_RC2
RC4 = ALG_CLASS_DATA_ENCRYPT Or ALG_TYPE_STREAM Or ALG_SID_RC4
End Enum
'---------------------------------------------------------------------------------------
' Procedure : EncryptData
' Purpose : Encrypts a byte array.
'---------------------------------------------------------------------------------------
'
Public Function EncryptData( _
data() As Byte, _
ByVal password As String, _
Optional ByVal HashAlgorithm As HashAlgorithm = MD5, _
Optional ByVal encAlgorithm As encAlgorithm = RC4) As Byte()
Dim lRes As Long
Dim hProv As Long
Dim hHash As Long
Dim hKey As Long
Dim lBufLen As Long
Dim lDataLen As Long
Dim abData() As Byte
' Get default provider context handle
lRes = CryptAcquireContext(hProv, vbNullString, _
vbNullString, PROV_RSA_FULL, 0)
' ····----==== Added 11/04/2003 ====----····
If lRes = 0 And Err.LastDllError = &H80090016 Then
' There's no default keyset container!!!
' Get the provider context and create
' a default keyset container
lRes = CryptAcquireContext(hProv, vbNullString, _
vbNullString, PROV_RSA_FULL, CRYPT_NEWKEYSET)
End If
' ····----========----····
If lRes <> 0 Then
' Create a hash object
lRes = CryptCreateHash(hProv, HashAlgorithm, 0, 0, hHash)
If lRes <> 0 Then
' Hash the password
lRes = CryptHashData(hHash, ByVal password, Len(password), 0)
If lRes <> 0 Then
' Derive a key from the hash
lRes = CryptDeriveKey(hProv, encAlgorithm, hHash, 0, hKey)
If lRes <> 0 Then
' Calculate the array size
lBufLen = UBound(data) - LBound(data) + 1
lDataLen = lBufLen
' Get required buffer size
lRes = CryptEncrypt(hKey, 0&, 1, 0, ByVal 0&, lBufLen, 0)
If lRes <> 0 Then
' Initialize the buffer
If lBufLen < lDataLen Then lBufLen = lDataLen
ReDim abData(0 To lBufLen - 1)
MoveMemory abData(0), data(LBound(data)), lDataLen
' Encrypt the data
lRes = CryptEncrypt(hKey, 0&, 1, 0, abData(0), lBufLen, lDataLen)
If lRes <> 0 Then
' Resize the array if the encrypted
' size is <> than the data size
If lDataLen <> lBufLen Then
ReDim Preserve abData(0 To lBufLen - 1)
End If
' Return the encrypted data
EncryptData = abData
End If
End If
End If
' Destroy the key
CryptDestroyKey hKey
End If
' Destroy the hash
CryptDestroyHash hHash
End If
' Release the provider context
CryptReleaseContext hProv, 0
End If
' Raise an error if lRes = 0
If lRes = 0 Then Err.Raise Err.LastDllError
End Function
'---------------------------------------------------------------------------------------
' Procedure : DecryptData
' Purpose : Decrypts a byte array.
'---------------------------------------------------------------------------------------
'
Public Function DecryptData( _
data() As Byte, _
ByVal password As String, _
Optional ByVal HashAlgorithm As HashAlgorithm = MD5, _
Optional ByVal encAlgorithm As encAlgorithm = RC4) As Byte()
Dim lRes As Long
Dim hProv As Long
Dim hHash As Long
Dim hKey As Long
Dim lBufLen As Long
Dim abData() As Byte
' Get default provider context handle
lRes = CryptAcquireContext(hProv, vbNullString, _
vbNullString, PROV_RSA_FULL, 0)
' ····----==== Added 11/04/2003 ====----····
If lRes = 0 And Err.LastDllError = &H80090016 Then
' There's no default keyset container!!!
' Get the provider context and create
' a default keyset container
lRes = CryptAcquireContext(hProv, vbNullString, _
vbNullString, PROV_RSA_FULL, CRYPT_NEWKEYSET)
End If
' ····----========----····
If lRes <> 0 Then
' Create a hash
lRes = CryptCreateHash(hProv, HashAlgorithm, 0, 0, hHash)
If lRes <> 0 Then
' Hash the password
lRes = CryptHashData(hHash, ByVal password, Len(password), 0)
If lRes <> 0 Then
' Derive a key from the hash
lRes = CryptDeriveKey(hProv, encAlgorithm, hHash, 0, hKey)
If lRes <> 0 Then
' Calculate the array size
lBufLen = UBound(data) - LBound(data) + 1
' Initialize the buffer
ReDim abData(0 To lBufLen - 1)
MoveMemory abData(0), data(LBound(data)), lBufLen
' Decrypt the data
lRes = CryptDecrypt(hKey, 0&, 1, 0, abData(0), lBufLen)
If lRes <> 0 Then
ReDim Preserve abData(0 To lBufLen - 1)
' Return the encrypted data
DecryptData = abData
End If
End If
' Destroy the key
CryptDestroyKey hKey
End If
' Destroy the hash
CryptDestroyHash hHash
End If
' Release the provider context
CryptReleaseContext hProv, 0
End If
' Raise an error if lRes = 0
If lRes = 0 Then Err.Raise Err.LastDllError
End Function |
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