Question & Answer
Question
According to the ICSF (Integrated Cryptographic Services Facility) manual, when CBC (cipher block chaining) mode is used for encryption, plaintext to be encrypted must be a multiple of 8 bytes. When sending data from the application to ICSF, how does VTAM deal with data that is not a multiple of 8 bytes?
Answer
VTAM automatically pads the plaintext data as appropriate to make it a multiple of 8 bytes.
The padding is independent of the value of the ENCRYPTN option.
VTAM uses random data derived from the TOD clock for padding. The last byte of the padding data is always the total length of the padding data field.
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSSN3L","label":"z\/OS Communications Server"},"Platform":[{"code":"PF035","label":"z\/OS"}],"Component":"","Version":"","Line of Business":{"code":"LOB35","label":"Mainframe SW"}}]
Product Synonym
ZOSCS COMMSERVER
Was this topic helpful?
Document Information
Modified date:
19 October 2015
UID
dwa1233952