Visual FoxPro

AES Encryption

See more Encryption Examples

AES encryption. The Chilkat encryption component supports 128-bit, 192-bit, and 256-bit AES encryption in ECB (Electronic Cookbook), CBC (Cipher-Block Chaining), and other modes. Visual FoxPro

LOCAL loCrypt
LOCAL lcIvHex
LOCAL lcKeyHex
LOCAL lcEncStr
LOCAL lcDecStr

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

loCrypt = CreateObject('Chilkat.Crypt2')

* AES is also known as Rijndael.		
loCrypt.CryptAlgorithm = "aes"

* CipherMode may be "ecb", "cbc", "ofb", "cfb", "gcm", etc.
* Note: Check the online reference documentation to see the Chilkat versions
* when certain cipher modes were introduced.
loCrypt.CipherMode = "cbc"

* KeyLength may be 128, 192, 256
loCrypt.KeyLength = 256

* 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.  AES has a block
* size of 16 bytes, so encrypted output is always
* a multiple of 16.
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 mode.
* 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 = "000102030405060708090A0B0C0D0E0F"
loCrypt.SetEncodedIV(lcIvHex,"hex")

* The secret key must equal the size of the key.  For
* 256-bit encryption, the binary secret key is 32 bytes.
* For 128-bit encryption, the binary secret key is 16 bytes.
lcKeyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
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 16).
* 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

* This is the encrypted output in hex format:
* 4846F83AA211E239AA62A21F527F089EE9DDBEAD30EE15D4E79B607A621B97BEDB9B6F00A9B21F1B43A50B4C1BE0EDF2

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

* This is the decrypted string:
* The quick brown fox jumps over the lazy dog.

RELEASE loCrypt