5812-DS00-R datasheet(16/84 Pages) BOARDCOM

16 / 84 page

BCM5812

Advance Data Sheet

3/11/03

B roa dcom Co rpo rat ion

Page 8

Cryptographic Operations

Document

5812-DS01-405-R

Figure 6: Computed HMAC Inner and Outer State

Note

Authentication without encryption for AH or for ESP with the NULL encryption algorithm is supported,

as is NULL authentication for confidentiality-only ESP. However, at least one of encryption or

authentication must be defined.

NULL encryption with NULL authentication is specifically disallowed.

Note

The byte order for 3DES keys, IV, and HMAC inner and outer states may differ from the host CPU string

byte order.

•

DES keys in FIPS-46-3 are numbered left to right, from 1 to 32. The first key byte is in the leftmost

byte position of the first 32-bit word of the key.

•

For example, the test key string <0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef> is represented in

the Command Context as two 32-bit words, <0x01234567, 0x89abcdef>.

•

Single DES uses the same command and structures, with all three keys the same.

•

The offset value in the command context is in 32-bit words, not in bytes.

KEY

16 or 20 bytes

Pad to 64 bytes

IPAD (0x56)

Pad to 64 bytes

MD5/SHA1

ROUND

INNER STATE

KEY

16 or 20 bytes

Pad to 64 bytes

OPAD (0x3c)

Pad to 64 bytes

MD5/SHA1

ROUND

OUTER STATE

KEY

16 or 20 bytes

Pad to 64 bytes

IPAD (0x56)

Pad to 64 bytes

MD5/SHA1

ROUND

INNER STATE

KEY

16 or 20 bytes

Pad to 64 bytes

OPAD (0x3c)

Pad to 64 bytes

MD5/SHA1

ROUND

OUTER STATE

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