you are, of course, correct. The 64-byte restriction did not appear
in S/38 so I ASSumed it wouldn't be there for the AS/400, but
it is. My guess:  IBM want you to purchase their cryptographic
support and not use CIPHER to do it so the DES function has
been deliberately crippled. Maybe this was necessary to
obtain an export license for the microcode?

> -----Original Message-----
> From: Gene_Gaunt/
> [SMTP:Gene_Gaunt/]
> Sent: Wednesday, January 05, 2000 1:58 PM
> To:
> Subject:      RE: cipher length
> CIPHER source lengths over 64 generate MCH5601,
> "Template value not valid".
> Calculating sixteen 48-bit subkeys adds some overhead when
> DES starts; why not do this once and let source length run long?
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