IBM Computer Hardware 2 User Manual Page 414

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CCA Release 2.54
Function Control Vector
The export (distribution) of cryptographic implementations by USA companies is
controlled under USA Government export regulations. An IBM 4758 becomes a
practical cryptographic engine when it accepts and validates digitally signed
software. IBM has chosen to export the IBM 4758 as a non-cryptographic product,
and to control and report the export of the cryptography-enabling software.
The CCA software that can be loaded into the Coprocessor limits the functionality
of the Coprocessor based on the values in a function control vector (FCV). At the
present time, two capabilities are controlled:
The length of keys used with the DES algorithm for general data encryption
The length of an RSA key used to encipher DES keys.
Notes:
1. Government policies and the FCV do not limit the key-length of keys used in
digital signature operations.
2. The SET services can employ 56-bit DES for data encryption, and 1024-bit
RSA key-lengths when distributing DES keys.
IBM distributes the FCV in a digitally signed data structure. Figure B-49 shows the
format of the data structure that contains the function control vector as distributed
by IBM.
Figure B-49 (Page 1 of 2). FCV Distribution Structure
Offset
Decimal
(Hex)
Length
Decimal
Meaning
000
(000)
390 Package header and validating-key certificate
390
(186)
080 Descriptive text coded in ASCII
470
(1D6)
204 Function control vector (FCV)
This is the information that you supply to the Coprocessor using the
Cryptographic_Facility_Control verb. It consists of the FCV information and
signature that is validated by the CCA code within the Coprocessor.
674
(2A2)
128 Digital signature on the complete structure (excepting this signature itself).
B-42 IBM 4758 CCA Basic Services, Release 2.54, February 2005
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