z/OS Cryptographic Services ICSF Administrator's Guide
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AES master key verification pattern algorithm

z/OS Cryptographic Services ICSF Administrator's Guide
SA22-7521-17

The AES master key verification pattern is calculated by:

  1. Appending X'01' to the clear key value of 32-byte master key (01 || key value)
  2. Generating the SHA-256 hash of the 33-byte string

The first eight bytes of the hash is the verification pattern

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