Does Chilkat Crypt support 3DES? Yes.

Question:
Does the Crypt2 Component support 3DES ??

Setting “CryptAlgorithm” to “3des” or “des” does not change the encoded
output when the “EncryptStringENC” method is used.

Answer:
Yes. The CryptAlgorithm should be set to “DES” (case-insensitive). The KeyLength property determines if it is DES (56 or 64), 3DES (112 or 128) or 2-Key TDES (168 or 192). Each byte in a DES key has a parity bit. An 8-byte key (64 bits) has 8 parity bits and 56 encryption bits. The Chilkat Crypt component will accept either number. In other words, to get Triple-DES (3DES) you may set the key length to either 168 or 192.