Usage notes

You can generate the verification pattern for a key when you generate the key. You can distribute the pattern with the key and it can be verified at the receiving node. In this way, users can ensure using the same key at the sending and receiving locations. You can generate and verify keys of any combination of key forms: clear, operational, or external.

The parity of the key is not tested.

For triple-length keys, use KEY-ENC or KEY-ENCD with ENC-ZERO. Clear triple-length keys are not supported.

In the Transaction Security System, KEY-ENC and KEY-ENCD both support enciphered single-length and double-length keys. They use the key-form bits in byte 5 of the control vector (CV) to determine the length of the key. To be consistent, in this implementation of CCA, both KEY-ENC and KEY-ENCD handle single- and double-length keys. Both products effectively ignore the keywords, which are supplied only for compatibility reasons.