Calculating 3DES Key Check Value (KCV) I am trying to verify a Triple DES Key Component generated by PC Crypto. 
The key portion is:

E6F1081FEA4C402CC192B65DE367EC3E  


and the KCV value that should be returned is:

212CF915


In theory, it should be calculated as: encryption of binary 0's with the key portion with 3DES.

I have been trying the following link, but the calculation doesn't work.
http://tripledes.online-domain-tools.com/

I used the following parametrization on the online tool.



Could anyone confirm that the calculation is performed as I mentioned?
Three problems here:


The online tool used expects a 24-byte (48 hex-character) key; thus you should enter E6F1081FEA4C402CC192B65DE367EC3EE6F1081FEA4C402C as the key, duplicating the first 8 bytes; this is the customary way to extend a two-block triple DES key of 16 bytes to a three-block triple DES key of 24 bytes.
You gave 16 bytes (32 hex chars) as input, which is twice as many bytes as required; this doesn't affect the computation of the KCV though.
The KCV value is supposed to be the first 3 bytes (6 hex chars) of the result, not 4 bytes (8 hex chars).


When this is fixed, the KCV 212cf9 is correctly obtained using the tool.

Note: it is a bad idea to use an online tool in order to check a real key, just like it is a bad idea to use an online RNG to generate a real key.