StreetPass: Difference between revisions
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== 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 == | ||