(Visual Basic 6.0) Encrypt / Decrypt a File and Verify it has not Changed

Demonstrates how to encrypt and decrypt a file, and verify it has not changed.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

' This requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim success As Long
Dim crypt As New ChilkatCrypt2

crypt.CryptAlgorithm = "aes"
crypt.CipherMode = "cbc"
crypt.KeyLength = 128
crypt.PaddingScheme = 0

Dim ivHex As String
ivHex = "000102030405060708090A0B0C0D0E0F"
crypt.SetEncodedIV ivHex,"hex"

Dim keyHex As String
keyHex = "00010203040506071011121314151617"
crypt.SetEncodedKey keyHex,"hex"

Dim dataFile As String
dataFile = "qa_data/zips/HBIQ040615300005.ZIP"
Dim outFile As String
outFile = "qa_output/HBIQ040615300005.enc"
Dim outFile2 As String
outFile2 = "qa_output/HBIQ040615300005.ZIP"

success = crypt.CkEncryptFile(dataFile,outFile)
success = crypt.CkDecryptFile(outFile,outFile2)

Dim fac As New CkFileAccess
Dim bEqual As Long
bEqual = fac.FileContentsEqual(dataFile,outFile2)
If (bEqual <> 1) Then
    Debug.Print "Decrypted file not equal to the original."
Else
    Debug.Print "Success."
End If