(PureBasic) 3DES Encryption, ECB, CBC modes

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

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IncludeFile "CkCrypt2.pb"

Procedure ChilkatExample()

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

    crypt.i = CkCrypt2::ckCreate()
    If crypt.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Specify 3DES for the encryption algorithm:
    CkCrypt2::setCkCryptAlgorithm(crypt, "3des")

    ; CipherMode may be "ecb" or "cbc"
    CkCrypt2::setCkCipherMode(crypt, "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.
    CkCrypt2::setCkKeyLength(crypt, 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.
    CkCrypt2::setCkPaddingScheme(crypt, 0)

    ; EncodingMode specifies the encoding of the output for
    ; encryption, and the input for decryption.
    ; It may be "hex", "url", "base64", or "quoted-printable".
    CkCrypt2::setCkEncodingMode(crypt, "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.
    ivHex.s = "0001020304050607"
    CkCrypt2::ckSetEncodedIV(crypt,ivHex,"hex")

    ; The secret key must equal the size of the key.  For 
    ; 3DES, the key must be 24 bytes (i.e. 192-bits).
    keyHex.s = "000102030405060708090A0B0C0D0E0F0001020304050607"
    CkCrypt2::ckSetEncodedKey(crypt,keyHex,"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).
    encStr.s = CkCrypt2::ckEncryptStringENC(crypt,"The quick brown fox jumps over the lazy dog.")
    Debug encStr

    ; Now decrypt:
    decStr.s = CkCrypt2::ckDecryptStringENC(crypt,encStr)
    Debug decStr


    CkCrypt2::ckDispose(crypt)


    ProcedureReturn
EndProcedure