Key label

If the first byte of the key identifier is greater than X'20' but less than X'FF', the field is considered to be holding a key label.

The contents of a key label are interpreted as the identifier of a key entry in the PKA storage file. The key label is an indirect reference to an internal key token.

If the first byte of the key identifier is X'FF', the identifier is not valid. If the first byte is less than X'20', the identifier is treated as a key token as described below.

A key label is specified on verbs with the key_identifier parameter as a 64-byte character string, left-aligned, and padded on the right with blanks. In most cases, the verb does not check the syntax of the key label other than the first byte.

A key label has the following form:

Offset	Length	Data
00 - 63	64	Key label name