z/OS Cryptographic Services ICSF Application Programmer's Guide
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ECB Wrapping of DES Keys (Original Method)

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

The wrapping of a double-length key (*K) using a double-length *KEK is defined as follows: 

 e*KEK(KL) || e*KEK(KR) = eKEKL(dKEKR(eKEKL(KL))) || eKEKL(dKEKR(eKEKL(KR)))

Where:

  • KL is the left 64 bits of *K.
  • KR is the right 64 bits of *K.
  • KEKL is the left 64 bits of *KEK.
  • KEKR is the right 64 bits of *KEK.
  • || means concatenation

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