Key slot of certain destination, for example CA, may contain a few keys, such as odd, even, and IV
key. This function can be used to decrypt only one key at a time. If the key is decrypted
and routed to the same slot entry more than once, the last call may overwrite any previous result.
.....
The key order shall be in big-endianness. The length of decrypted key could be 64/128/192 bits.
If the actual key bytes to load is shorter than 192 bits, the encrypted will be loaded at the most
significant byte of the aucKeyData variable. For example 64-bit DES key is occupying first 8
bytes of aucKeyData variable.
Refer to Load key documentation on how to load 3DES-ABA and 3DES-ABC keys.
Note that some systems may require to load the control word for CA and CP. BHSM_LoadRouteUserKey
can be used for this purpose.