2-Key Triple DES

Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption).

Download Chilkat Crypt ActiveX

Dim crypt As New ChilkatCrypt2

Dim success As Long
success = crypt.UnlockComponent("Anything for 30-day trial.")
If (success <> 1) Then
    MsgBox "Crypt component unlock failed"
    Exit Sub
End If

'  Specify 3DES for the encryption algorithm:
crypt.CryptAlgorithm = "3des"

crypt.CipherMode = "ecb"

'  For 2-Key Triple-DES, use a key length of 128
'  (Given that each byte's msb is a parity bit, the strength is really 112 bits).
crypt.KeyLength = 128

'  Pad with zeros
crypt.PaddingScheme = 3

'  EncodingMode specifies the encoding of the output for
'  encryption, and the input for decryption.
'  It may be "hex", "url", "base64", or "quoted-printable".
crypt.EncodingMode = "hex"

'  Let's create a secret key by using the MD5 hash of a password.
'  The Digest-MD5 algorithm produces a 16-byte hash (i.e. 128 bits)
crypt.HashAlgorithm = "md5"
Dim keyHex As String
keyHex = crypt.HashStringENC("secretPassword")

'  Set the encryption key:
crypt.SetEncodedKey keyHex,"hex"

'  Encrypt
Dim encStr As String
encStr = crypt.EncryptStringENC("The quick brown fox jumped over the lazy dog")
MsgBox encStr

'  Now decrypt:
Dim decStr As String
decStr = crypt.DecryptStringENC(encStr)
MsgBox decStr