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参数资料
| 型号： | CA95C09-10CT |
| 元件分类： | 加密电路 |
| 英文描述： | TELECOM, DATA ENCRYPTION CIRCUIT, PQFP44 |
| 封装： | TQFP-44 |
| 文件页数： | 25/42页 |
| 文件大小： | 180K |
| 代理商： | CA95C09-10CT |
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Tundra Semiconductor Corporation
CA95C68/18/09
Tundra Semiconductor Corporation
3-55
Figure 3-19 : Multiplexed Control Mode CBC
Programming Flow Chart
RESET
PROGRAM MODE
REGISTER
1.
LOAD
ENCRYPTED
E/D KEY
REMOVE DATA
ENTER
START COMMAND
LOAD
MASTER KEY
LOAD CLEAR
E/D KEY
IS
INPUT FLAG
ACTIVE
?
ENTER
STOP COMMAND
AT
END OF
SESSION
?
YES
NO
YES
2.
3.
NO
YES
4.
ENTER DATA
3A.
3B.
6.
5.
IS
OUTPUT FLAG
ACTIVE
?
7.
8.
9.
10.
LOAD
ENC. 1VE/IVD
LOAD
D KEY
LOAD CLEAR
IVE/IVD
3.1
3.1.A
3.1.B
CBC Operation
Figure 3-19 illustrates the DCP programming sequence for
implementing
the
CBC
method
of
ciphering.
The
programming sequence is identical to the ECB programming
sequence except for an extra step included between steps 3
and 4. The Initialization Vectors (IVs) must be loaded before
beginning to cipher data. These IVs can be loaded in either
clear (step 3.1) or ciphered form (steps 3.1.A and 3.1.B).
3.1
Load
in
eight
bytes
(MSB
rst)
of
the
Initialization Vector through the Master Port.
3.1.A(B)
If the Initialization Vector is entered in encrypted
form, it is decrypted using the Decrypt Session
Key in ECB mode before being stored in the
appropriate register. Load the D Key (if not
already done) prior to executing an encrypted IV
command. The eight IV bytes are then loaded
into the Input Register and decrypted. The bits
(Cipher Type and Encrypt/Decrypt bit) in the
Mode Register are not affected by the decrypting
of the IVs.
CFB Operation
The ow chart for the instruction sequence in CFB mode is
very similar to CBC mode. The DCP can be programmed to
execute in either 1-bit or 8-bit CFB mode. The Input and
Output Registers hold between one and 8 bits depending on
the cipher type and the setting of bits in the Mask Register.
In both modes, the IV is rst ciphered by the algorithm unit
and the result is then XORed with the input byte or bit (see
explanation of Mask Register for CFB-1 mode). The XOR
result is then loaded into the Output Register to be read out
by the CPU. This result is also shifted into the current IV
Register to be used in the next cipher session. When
operating in CFB mode, the Output Register must rst be
emptied before issuing a Stop command to the DCP. If you
must stop in the middle of inputting a block of data while
using ECB or CBC ciphering in Multiplexed Control Mode,
follow this instruction sequence to avoid erroneous data:
1)
Issue a Stop command.
2)
Read all available data from the Output Register.
3)
Reload the Mode Register.
4)
Issue a Start command.
5)
Wait for the input ag to go active and resume data
input.
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