Freescale Semiconductor MPC8313E PowerQUICC II Pro Family Reference Manual page 660

Security Engine (SEC) 2.2
Now assume that the channel accesses its next data parcel using Pointer3 again, this time with
length given by Length3. In this case the channel continues to the next line of the link table, and
begins reading the memory segment specified there. As before, the channel concatenates memory
segments from as many link table entries as necessary to obtain the required number of bytes
(Length3).
Similarly, the next data parcel is obtained by using Pointer3 yet again, this time with length given
by Extent4.
Assume that for the current descriptor type, the Extent4 data parcel is the last one to be accessed
through Pointer3. Then the link table entry that supplies the last memory segment for Extent4 has
the R bit set, signifying that this is the last entry in the chain of link tables.
14.3.5 Descriptor Types
An example of how the pointer dwords should be used with the various descriptor types to load keys,
context, and text-data into the execution units, and how the required outputs should be unloaded is shown
below.
Descriptor field Pointer
Type type Dword1
0000_0
Length
aesu_ctr_
undefined
Extent
nosnoop
0001_0
Length
common_
undefined
Extent
nosnoop
1100_0 Length HMAC Key
hmac_snoop_
undefined
Extent
aesu_ctr
0000_1 Length HMAC Key
undefined
Extent
ipsec_esp
0001_1
Length
undefined
Extent
ccmp
0010_1 Length HMAC Key
undefined
Extent
srtp
1000_1 MAC Key
Length
outbound
undefined
tls_ssl_
Extent
block
MPC8313E PowerQUICC™ II Pro Integrated Processor Family Reference Manual, Rev. 2
14-18
Table 14-10. Descriptor Format by Type
Pointer
Dword2
nil Cipher IV Cipher Key
undefined undefined
nil Cipher IV Cipher Key
undefined undefined
HMAC Data AES Key
undefined undefined
HMAC Data Cipher IV
undefined undefined
nil AES-Ctx AES Key
undefined undefined
AES-Ctx AES Key
undefined undefined
Cipher IV Cipher Key
undefined undefined
Pointer Pointer Pointer
Dword 3 Dword4 Dword 5
In FIFO Out FIFO
nil
In FIFO Out FIFO
nil
AES Ctx In FIFO
nil
Cipher Key In FIFO
nil HMAC In
In FIFO In FIFO
nil
In FIFO Out FIFO
In FIFO In FIFO
In FIFO In FIFO
Auth & CIpher Cipher Only
In FIFO MAC Out
Auth only
Pointer
Dword 6
Cipher IV Out
nil nil
Cipher IV Out
nil nil
Out FIFO HMAC Out
nil nil
Out FIFO Cipher IV Out
HMAC Out
Out FIFO AES-Ctx-Out
nil nil
HMAC Out AES-Ctx-Out
nil
Out FIFO Cipher IV Out
nil
Freescale Semiconductor
Pointer
Dword 7
nil
undefined
nil
undefined
undefined
undefined
undefined
undefined
undefined