z/OS Cryptographic Services ICSF Application Programmer's Guide
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When the Target Key Token CV Is Null

z/OS Cryptographic Services ICSF Application Programmer's Guide
SA22-7522-16

When you use any of the LEFT, BOTH, or RIGHT keywords, and when the control vector in the target key token is null (all B'0'), then bit 3 in byte 59 will be set to B'1' to indicate that this is a double-length DATA key.

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