SG Intec Ltd & Co KG SG-Lock, Developer'S Manual

Page: 35 / 63

Chapter 4: SG-Lock API 29
Parameters
ProductId Indicates the ProductId of the SG-Lock
AppSignKey The 128-bit key used by the application for sign-
ing and verification. Pointer to an array of 4 in-
teger values of 32-bit. Only needed in combined
mode otherwise set 0.
LockSignKeyNum Number of 128-bit key in SG-Lock for signing
and verification.
Mode working mode
0 - create signature
1 - verify signature
LockSignInterval Indicates the partitioning of computing power
between SG-Lock and application (PC-CPU). 0
is SG-Lock only. If >0 the value is used as the
power of 2, where the result of that determines
which block index is signed or verified by the
SG-Lock. E.g. value= 8, 2 ˆ8=256, that means the
first and after that every 256th block is processed
by the SG-Lock and all others by the application
(PC-CPU). That means 1/256= 0.4% of the task
is done by the SG-Lock and 99.6% by the PC-
CPU. The result is a very high acceleration of the
process.
DataLen Count of 32-bit values to process in data array.
Data Pointer to the array of 32-bit values to sign or
verify.
Signature Pointer to an array of 2 integers of 32-bit where
the created signature is given back (signing
mode) or where the signature is given to the func-
tion for verification (verify mode).