LDN services: Difference between revisions
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When encryption is enabled, the encrypted data is at +0x28 (+0x38 with EncryptionType3) with size {remaining frame size}. The key is derived from the raw 0x20-bytes at +0x0. The CTR/IV is {raw Counter above without byte-swap}, with the rest cleared to zeros. The AAD for AES-128-GCM is at +0x0 size 0x28-bytes. | When encryption is enabled, the encrypted data is at +0x28 (+0x38 with EncryptionType3) with size {remaining frame size}. The key is derived from the raw 0x20-bytes at +0x0. The CTR/IV is {raw Counter above without byte-swap}, with the rest cleared to zeros. The AAD for AES-128-GCM is at +0x0 size 0x28-bytes. | ||
The content data at +{above_header_size} follows, which has the size specified above (which must be >=0x500), where all fields are big-endian: | The content data at +{above_header_size} follows, which has the size specified above (which must be >=0x500), where all fields are big-endian. For EncryptionType1-2: | ||
{| class="wikitable" border="1" | {| class="wikitable" border="1" | ||
| Line 1,693: | Line 1,693: | ||
|- | |- | ||
| 0x4F8 || 0x8 || [6.0.0+] [[#NetworkInfo]]+0x478 | | 0x4F8 || 0x8 || [6.0.0+] [[#NetworkInfo]]+0x478 | ||
|} | |||
For EncryptionType3: | |||
{| class="wikitable" border="1" | |||
|- | |||
! Offset | |||
! Size | |||
! Description | |||
|- | |||
| 0x0 || 0x10 || [[#NetworkInfo]]+0x50 | |||
|- | |||
| 0x1A || 0x2 || Bit7 must be clear. | |||
|- | |||
| 0x26 || 0x1 || s8 [[#NetworkInfo]]+0x66 (NodeCountMax) | |||
|- | |||
| 0x27 || 0x1 || s8 [[#NetworkInfo]]+0x67 (NodeCount) | |||
|- | |||
| 0x28 || NodeCount*0x30 || Array of the below node struct. | |||
|- | |||
| 0x28 + (NodeCount*0x30) || 0x2 || [[#NetworkInfo]]+0x26A (AdvertiseDataSize) | |||
|- | |||
| 0x2A + (NodeCount*0x30) || AdvertiseDataSize || [[#NetworkInfo]]+0x26C (AdvertiseData) | |||
|} | |} | ||
The data here is copied into [[#NetworkInfo]]. | The data here is copied into [[#NetworkInfo]]. | ||
Node data used in the above array (all fields big-endian), which are copied into the [[#NetworkInfo]] [[#NodeInfo|NodeInfo]] array: | Node data used in the above array (all fields big-endian), which are copied into the [[#NetworkInfo]] [[#NodeInfo|NodeInfo]] array. For EncryptionType1-2: | ||
{| class="wikitable" border="1" | {| class="wikitable" border="1" | ||
| Line 1,718: | Line 1,741: | ||
|- | |- | ||
| 0x2E || 0xA || Unused | | 0x2E || 0xA || Unused | ||
|} | |||
For EncryptionType3: | |||
{| class="wikitable" border="1" | |||
|- | |||
! Offset | |||
! Size | |||
! Description | |||
|- | |||
| 0x0 || 0x4 || [[#Ipv4Address]] | |||
|- | |||
| 0x4 || 0x6 || [[#MacAddress|MacAddress]] | |||
|- | |||
| 0xA || 0x1 || | |||
|- | |||
| 0xB || 0x1 || | |||
|- | |||
| 0xC || 0x20 || First 0x20-bytes of [[#UserConfig]]. | |||
|} | |} | ||