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(Excel) 2-Key Triple DES (112 bits)Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption).
' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim crypt As Chilkat.Crypt2 Set crypt = Chilkat.NewCrypt2 ' 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" keyHex = crypt.HashStringENC("secretPassword") ' Set the encryption key: crypt.SetEncodedKey keyHex,"hex" ' Encrypt encStr = crypt.EncryptStringENC("The quick brown fox jumped over the lazy dog") Debug.Print encStr ' Now decrypt: decStr = crypt.DecryptStringENC(encStr) Debug.Print decStr |
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