5812-DS00-R datasheet(22/84 Pages) BOARDCOM

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BCM5812

Advance Data Sheet

3/11/03

B roa dcom Co rpo rat ion

Page 14

Cryptographic Operations

Document

5812-DS01-405-R

Figure 12: SSL MAC Computation Using MD5

The computation using SHA-1 differs only in the length of the MAC secret (20 bytes) and the number of pad bytes (40 rather

than 48). Figure 13 diagrams the SSL MAC computation using SHA-1.

Figure 13: SSL MAC Computation Using SHA-1

Figure 14 on page 15 shows the command context used for computing the SSL MAC. Table 5 shows the codes for MD5 and

SHA-1. The SSL MAC command context length is always 88 bytes.

This command uses MCR1@. The opcode for this command is 0x01.

SSL MAC Computation (MD5)

Authenticated Length

MAC Secret (16 Bytes)

Content Type

Application Data

PAD1 (48 Bytes of 0x36)

Sequence Number (8 Bytes)

MAC Secret (16 Bytes)

PAD2 (48 Bytes of 0x5C)

Hash value (16 Bytes)

MD5

Output

MD5

Output

SSL MAC Computation (MD5)

Authenticated Length

MAC Secret (16 Bytes)

Content Type

Application Data

PAD1 (48 Bytes of 0x36)

Sequence Number (8 Bytes)

MAC Secret (16 Bytes)

PAD2 (48 Bytes of 0x5C)

Hash value (16 Bytes)

MD5

Output

MD5

Output

SSL MAC Computation (SHA-1)

Authenticated Length

MAC Secret (20 Bytes)

Content Type

Application Data

PAD1 (40 Bytes of 0x36)

Sequence Number (8 Bytes)

MAC Secret (20 Bytes)

PAD2 (40 Bytes of 0x5C)

Hash value (20 Bytes)

SHA-1

Output

SHA-1

Output

SSL MAC Computation (SHA-1)

Authenticated Length

MAC Secret (20 Bytes)

Content Type

Application Data

PAD1 (40 Bytes of 0x36)

Sequence Number (8 Bytes)

MAC Secret (20 Bytes)

PAD2 (40 Bytes of 0x5C)

Hash value (20 Bytes)

SHA-1

Output

SHA-1

Output

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