B4X

2-Key Triple DES (112 bits)

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Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption). B4X

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

Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

'  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 = crypt.HashStringENC("secretPassword")

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

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

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