Description of Figure The Mac Class

This figure consists of boxes labeled as follows:

• Data: Two boxes are labeled this
• MAC (HmacSHA256): Two boxes are labeled this
• Shared Secret Key
• Signal Digest Hash: Two boxes are labeled this
• If data was the same, the hash is the same

Labeled arrows connect these boxes:

• update(): From Data #1 to MAC (HmacSHA256) #1
• doFinal(): From Data #1 to MAC (HmacSHA256) #1
• update(): From Data #2 to MAC (HmacSHA256) #2
• doFinal(): From Data #2 to MAC (HmacSHA256) #2

Unlabeled arrows connect these boxes:

• From Shared Secret Key to MAC (HmacSHA256) (two separate arrows)
• From MAC (HmacSHA256) #1 to Signed Digest Hash #1
• From MAC (HmacSHA256) #2 to Signed Digest Hash #2
• From Signed Digest Hash #1 to If data was the same, the hash is the same
• From Signed Digest Hash #2 to If data was the same, the hash is the same