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Purpose

This exit is called by TIRxxTCP when it detects that the client sent an encrypted cooperative buffer. This exit can be used to decrypt the area pointed to by DCNCRDAT using the length pointed to by DCNCRDTL. The maximum size of the decrypted data cannot exceed the length pointed to by DCMAXDTL.

The decrypted data is not passed on to the server, instead it is used by TIRxxTCP to extract the cooperative buffer security data to populate the OTMA Security Header and OTMA User Header as determined by SECOTMA flag set by the TIRxxTSC exit.