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): 5/64頁(yè)
文件大小: 572K
代理商: VMS115
VLSI Technology, a subsidiary of Philips Semiconductors
8/10/99
13
Revision: 2.3
906
Data Sheet
Pre-DES Hash and Hash Only Processing
5.1.3.2
HMAC Throughput Calculations
These calculations are for the HMAC performance. The raw numbers in the table are applicable
to Hash only operations and DES Encrypt/Hash operations. The throughput for DES Decrypt/
Hash must account for the injected delay of decrypting data prior to sending it to the Hash engine.
This delay will be 30 clock cycles.
P = packet size in bytes
n = number of 64-byte (512-bit) blocks = Round up to nearest integer [(P + 8)/64]
f = frequency = 80 MHz
Hash Processing
Function
Description
Clock Cycles
LC
Load Context
21
A
Load 16 x 4 bytes into In-Place Buffer
17
B
Word Align and Assemble
17
C
Load Hash FIFO
16
D
Load Hash Block
16
EStartup Cycle
1
F (MD5)
MD5 Hash Processing
128
F (SHA-1)
SHA-1 Hash Processing
160
GHMAC Feedback
6
A
B
D
C
A
D
C
F
0
B
21
170-MD5
202-SHA-1
Clock Cycles
F
315-MD5
379-SHA-1
E
F
G
D
HMAC
LC
42
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