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→CCMP Key
== CCMP Key ==
== CCMP Key ==
The StreetPass local-WLAN CCMP data-encryption key is generated by the StreetPass CECD module, where the CCMP key is the 16-byte output from encrypting an all-zero block with AES-CTR via [[PS:EncryptDecryptAes]], with keytype6. The CTR is the first 0x10-bytes from a SHA1-HMAC hash. The SHA1-HMAC key is a 17-byte text string including the NULL-terminator, a seperate HMAC key is used for retail/dev-units, this is determined via [[Configuration_Memory|UNITINFO]] bit0. The data hashed with SHA1-HMAC is a 0x1C-byte buffer.
The StreetPass local-WLAN CCMP data-encryption key is generated by the StreetPass CECD module, where the CCMP key is the 16-byte output from encrypting an all-zero block with AES-CTR via [[PS:EncryptDecryptAes]], with keytype6. The CTR is the first 0x10-bytes from a SHA1-HMAC hash. The SHA1-HMAC key is a 17-byte text string including the NULL-terminator, a seperate HMAC key is used for retail/dev-units, this is determined via [[Configuration_Memory|UNITINFO]] bit0. The data hashed with SHA1-HMAC is a 0x1C-byte buffer, which is described below.
=== Hash Block ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x10
| Unknown, copied from some structure.
|-
| 0x10
| 0x6
| MAC address for host/client?
|-
| 0x16
| 0x6
| MAC address for client/host?
|}
== StreetPass Exchange ==
== StreetPass Exchange ==