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)： 4/64頁(yè)
文件大?。?/td> 572K
代理商： VMS115
VLSI Technology, a subsidiary of Philips Semiconductors
8/10/99
12
Revision: 2.3
906
Data Sheet
digest, or to find two different messages which produce the same message digest.
The following diagram illustrates the typical flow required to compute a Hash Digest. Both the
MD5 and SHA-1 hashing algorithms generate a hash digest from two inputs; a state value and a
data value. The data value is 512-bits and the state value varies depending upon the hash algo-
rithm. The computed digest is 128 bits for MD5 and 160 bits for SHA-1.
Hash Flow Diagram
Generating an HMAC (Hash Message Authentication Code) digest requires several hash opera-
tions. If n is the number of 512-bit blocks which need to be hashed, then the total number of hash
operations is n + 3. Two of the extra three operations can be precomputed prior to data being sent
to the VMS115. The precomputed hash operations result in the IPAD Key and OPAD Key values.
The third extra hash operation is required to actually generate the HMAC Digest, which is the
result of hashing the OPAD Key and the digest result from the last packet data hash operation.
HMAC Flow Diagram
5.1.3.1
Hash Throughput
The following diagram illustrates the hash pipeline when hashing prior to performing DES.
Data
State
- Hash Function Output
- Hash Function Input
Digest
State
Data
Digest
Hash
Algorithmic
IPAD xor Key
Hash
IPAD Key
Packet Data 1
Hash
Digest
. . .
Packet Data n
Hash
Constant
Hash
OPAD xor Key
OPAD Key
Hash
Digest
HMAC
Pre-Computed
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