Production Specification

07/03/02

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5802-DS03-405-R

Memory Structures

u16 operation_type; /* ModInv (0x48)*/

u16 reserved;

u16 modulus_length; /* Modulus N Length in bits */

u32 N[(modulus_length <= 512)? 16 : (modulus_length <= 768)? 24 : 32]; /* Modulus N */

u32 E[(modulus_length + 31)/32]; /* Exponent (N-2) */

} ModInv_CtxCmdBuf;

/* Master command record */

typedef struct MasterCmd_struct {

u16 numKeysetup; /* Number of Key setups in this MCR*/

u16 flags; /* Completion/error status from chip, per MCR */

/* flags[0] = 1 if processing of the MCR is finished

0 otherwise

flags[1] = 1 if an error occurred

0 if no error occurred

flags[7:2]: reserved

flags[15:8] = error code if an error occurred (i.e. flags[1] == 1),

undefined otherwise

*/

/*

* Following 5 fields occur once per key setup in the MCR

*/

uint firstKeySetupCMDAddr;

DataBufChain firstKeySetupData; /* First descriptor for input key setup data */

u16 reserved;

u16 dLength; /* Total length of the input data for the first key setup */

DataBufChain firstOutputData; /* First descriptor for output key setup data */

/*

* Followed by as many sets of above 5 fields as there

* are key setups in this MCR

*/

} MasterCmd;

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The tables below illustrate memory-based structures used for CPU to chip communication. Fields in quotes refer to structure

names from the description on the previous pages.

IPsec ESP and AH (Bulk Encryption and Authentication) Processing

Each entry in the linked list points at a data buffer that contains actual packet data, a next field that points to the next

descriptor entry in the linked list, and a length field that contains the number of bytes stored in the data buffer.

Table 4:

Data Buffer Chain Entries

MSB

LSB

31 30

29 28

27 26

25

24 23

22 21

20 19

18

17 16

15

14 13

12 11

10 9

876

5432

10

Data Buffer Address dataAddr

Next entry in linked list of data buffers next

Reserved

Data buffer length dataLen