Unless otherwise noted, all String parameters that are either written to, or read from, a TR-31 key block will be in EBCDIC format. Input parameters are converted to ASCII before being written to the TR-31 key block and output parameters are converted to EBCDIC before being returned (see Appendix G. EBCDIC and ASCII Default Conversion Tables). TR-31 key blocks themselves are always in printable ASCII format as required by the ANSI TR-31 specification.

Note that the Padding Block, ID “PB" is not allowed to be added by the user. A Padding Block of the appropriate size, if needed, will be added when building the TR-31 key block in TR-31 Export. If the TR-31 Export callable service encounters a padding block in the optional block data, an error will occur.

This table lists the required cryptographic hardware for each server type and describes restrictions for this callable service.

Table 120. TR-31 Optional Data Build required hardware

Server	Required cryptographic hardware	Restrictions
IBM zSeries 900	None
IBM zSeries 990 IBM zSeries 890	None
IBM System z9 EC IBM System z9 BC	None
IBM System z10 EC IBM System z10 BC	None
z196	None