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(Tcl) 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.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

set crypt [new_CkCrypt2]

set success [CkCrypt2_UnlockComponent $crypt "Anything for 30-day trial"]
if {[expr $success != 1]} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    exit
}

#  Specify 3DES for the encryption algorithm:
CkCrypt2_put_CryptAlgorithm $crypt "3des"

#  CipherMode may be "ecb" or "cbc"
CkCrypt2_put_CipherMode $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_put_KeyLength $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_put_PaddingScheme $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_put_EncodingMode $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.
set ivHex "0001020304050607"
CkCrypt2_SetEncodedIV $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).
set keyHex "000102030405060708090A0B0C0D0E0F0001020304050607"
CkCrypt2_SetEncodedKey $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).
set encStr [CkCrypt2_encryptStringENC $crypt "The quick brown fox jumps over the lazy dog."]
puts "$encStr"

#  Now decrypt:
set decStr [CkCrypt2_decryptStringENC $crypt $encStr]
puts "$decStr"

delete_CkCrypt2 $crypt

 

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