Datasheet

PUKCL _GF2NEccMul(nu1ModBase) = <Base of the ram location of P>;
PUKCL _GF2NEccMul(u2ModLength) = <Byte length of P>;
PUKCL _GF2NEccMul(nu1CnsBase) = <Base of the ram location of Cns>;
PUKCL _GF2NEccMul(nu1PointBase) = <Base of the ram location of the A point>;
PUKCL _GF2NEccMul(nu1ABase) = <Base of the ram location of the parameters a and b of the
elliptic
curve>;
PUKCL _GF2NEccMul(nu1KBase) = <Base of the ram location of the scalar number>;
PUKCL _GF2NEccMul(nu1Workspace) = <Base of the ram location of the workspace>;
PUKCL _GF2NEccMul(u2KLength) = <Length of the ram location of the scalar number>;
...
// vPUKCL_Process() is a macro command, which populates the service name
// and then calls the library...
vPUKCL_Process(GF2NEccMulFast,&PUKCLParam);
if (PUKCL (u2Status) == PUKCL_OK)
{
...
}
else // Manage the error
43.3.7.4.6 Constraints
No overlapping between either input and output are allowed. The following conditions must be avoided to
ensure the service works correctly:
• nu1ModBase, nu1CnsBase, nu1PointBase, nu1ABase, nu1KBase, nu1Workspace are not aligned
on 32-bit boundaries
• {nu1ModBase, u2ModLength + 4}, {nu1CnsBase, u2ModLength + 8}, {nu1PointBase,
3*u2ModLength+ 12}, {nu1ABase, 2*u2ModLength + 8}, {nu1KBase, u2KLength} or {nu1Workspace,
8*u2ModLength + 44} are not in Crypto RAM
• u2ModLength is either: < 12, > 0xffc or not a 32-bit length
• All overlapping between {nu1ModBase, u2ModLength + 4}, {nu1CnsBase, u2ModLength +8},
{nu1PointBase, 3*u2ModLength + 12}, {nu1ABase, 2*u2ModLength + 8}, {nu1KBase, u2KLength}
and {nu1Workspace, 8*u2ModLength + 44}
43.3.7.4.7 Status Returned Values
Table 43-99. GF2NEccMulFast Service Return Codes
Returned Status Importance Meaning
PUKCL_OK – The computation passed without problem.
43.3.7.5 Projective to Affine Coordinates Conversion
43.3.7.5.1 Purpose
This service is used to perform a point coordinates conversion from a projective representation to an
affine.
43.3.7.5.2 How to Use the Service
43.3.7.5.3 Description
The operation performed is:

  
=

Pr    

 Pr 

  
=

 Pr 

 Pr 
2
In this computation, the following parameters need to be provided:
SAM D5x/E5x Family Data Sheet
Public Key Cryptography Controller (PUKCC)
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1552