參數(shù)資料
型號(hào)： VMS115
元件分類： 加密電路
英文描述： TELECOM, DATA ENCRYPTION CIRCUIT, PQFP100
封裝： MQFP-100
文件頁(yè)數(shù)： 56/64頁(yè)
文件大?。?/td> 572K
代理商： VMS115
VLSI Technology, a subsidiary of Philips Semiconductors
8/10/99
6
Revision: 2.3
906
Data Sheet
4.2
Packet Data
Incoming packets must begin on 4 byte boundaries and all packet data must be contiguous.
Packet data must always be transferred to the VMS115 4 bytes at a time. The end of the packet
will be determined by the Total Length field in the Opcode Register. Bytes in the last 4 byte seg-
ment beyond the Total Length value will be ignored by the VMS115.
When DES is disabled in the Opcode Register, DES Length and DES Offset are ignored. Simi-
larly, when the Hash function is disabled in the Opcode Register, Hash Length and Hash Offset
are ignored.
The Hash Offset value must be less than or equal to the DES Offset value when both the Hash and
DES functions are enabled in the Opcode Register.
The DES Length must be a multiple of 8 bytes, thus bits 0,1 and 2 of DES Length must be set to
0. If DES Length equals 0, then no packet data will be processed by the DES engine. Likewise, if
Hash Length equals 0, then no packet data will be processed by the Hash engine. If not disabling
Context Data Write
Context Data Read
0
31
32 Bits
104 Bytes
Hash Digest
32 Bits
84 Bytes
0
31
HMAC OPAD Key
a
b
c
d
e
Op Code
HMAC IPAD Key
a
b
c
d
e
HASH Length
DES Length
HASH Offset
DES Offset
Intial Vector (DES)
0
4
3
7
5
6
1
2
DES Key #0
0
4
3
75
6
1
2
DES Key #1
0
4
3
7
5
6
1
2
DES Key #2
0
4
3
7
5
6
1
2
HMAC OPAD Key
a
b
c
d
e
Op Code
HMAC IPAD Key
a
b
c
d
e
HASH Length
DES Length
HASH Offset
DES Offset
Intial Vector (DES)
0
4
3
7
5
6
1
2
DES Key #0
0
4
3
75
6
1
2
DES Key #1
0
4
3
7
5
6
1
2
DES Key #2
0
4
3
7
5
6
1
2
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