Visual FoxPro

3DES Encryption, ECB, CBC modes

See more Encryption Examples

3DES encryption. The Chilkat encryption component supports Triple-DES in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) cipher modes. Visual FoxPro

LOCAL loCrypt
LOCAL lcIvHex
LOCAL lcKeyHex
LOCAL lcEncStr
LOCAL lcDecStr

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

loCrypt = CreateObject('Chilkat.Crypt2')

*  Specify 3DES for the encryption algorithm:
loCrypt.CryptAlgorithm = "3des"

*  CipherMode may be "ecb" or "cbc"
loCrypt.CipherMode = "cbc"

*  KeyLength must be 192.  3DES is technically 168-bits;
*  the most-significant bit of each key byte is a parity bit,
*  so we must indicate a KeyLength of 192, which includes
*  the parity bits.
loCrypt.KeyLength = 192

*  The padding scheme determines the contents of the bytes
*  that are added to pad the result to a multiple of the
*  encryption algorithm's block size.  3DES has a block
*  size of 8 bytes, so encrypted output is always
*  a multiple of 8.
loCrypt.PaddingScheme = 0

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

*  An initialization vector is required if using CBC or CFB modes.
*  ECB mode does not use an IV.
*  The length of the IV is equal to the algorithm's block size.
*  It is NOT equal to the length of the key.
lcIvHex = "0001020304050607"
loCrypt.SetEncodedIV(lcIvHex,"hex")

*  The secret key must equal the size of the key.  For 
*  3DES, the key must be 24 bytes (i.e. 192-bits).
lcKeyHex = "000102030405060708090A0B0C0D0E0F0001020304050607"
loCrypt.SetEncodedKey(lcKeyHex,"hex")

*  Encrypt a string...
*  The input string is 44 ANSI characters (i.e. 44 bytes), so
*  the output should be 48 bytes (a multiple of 8).
*  Because the output is a hex string, it should
*  be 96 characters long (2 chars per byte).
lcEncStr = loCrypt.EncryptStringENC("The quick brown fox jumps over the lazy dog.")
? lcEncStr

*  Now decrypt:
lcDecStr = loCrypt.DecryptStringENC(lcEncStr)
? lcDecStr

RELEASE loCrypt