LDN services: Difference between revisions

Line 1,653:

| 0x21 || 0x1 || Encryption type: 1 = plaintext, 2 = AES-128-CTR, 3 = AES-128-GCM, {frames with other values are ignored by [[#Scan]]/[[#ScanPrivate]]}. Must match the type which is currently being used: with [[#Scan]]/[[#ScanPrivate]] this is determined via this field, otherwise [[#SecurityConfig]] is used to determine this.

|-

| 0x22 || 0x2 || Big-endian u16 size for the data starting at +0x48 (+0x38 with EncryptionType3)~~, must be <=0x500~~, and must match {total frame size relative to +0x0 above} - {header_size}.

| 0x22 || 0x2 || Big-endian u16 size for the data starting at +0x48 (+0x38 with EncryptionType3), and must match {total frame size relative to +0x0 above} - {header_size}.

|-

| 0x24 || 0x4 || Big-endian u32 Counter. The initial value is randomly-generated. This is incremented each time the below content is updated (including initial creation). Also used by the Station to determine whether the frame changed compared to a previous one. When comparing against a previous frame, new_counter-prev_counter must be <= 0xFF, and the counters must not match.

Line 1,666:

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. For EncryptionType1-2:

The content data at +{above_header_size} follows, which has the size specified above (which must be >=0x500 with EncryptionType1-2), where all fields are big-endian. For EncryptionType1-2:

{| class="wikitable" border="1"

@@ Line 1,653: / Line 1,653: @@
 | 0x21 || 0x1 || Encryption type: 1 = plaintext, 2 = AES-128-CTR, 3 = AES-128-GCM, {frames with other values are ignored by [[#Scan]]/[[#ScanPrivate]]}. Must match the type which is currently being used: with [[#Scan]]/[[#ScanPrivate]] this is determined via this field, otherwise [[#SecurityConfig]] is used to determine this.
 |-
-| 0x22 || 0x2 || Big-endian u16 size for the data starting at +0x48 (+0x38 with EncryptionType3), must be <=0x500, and must match {total frame size relative to +0x0 above} - {header_size}.
+| 0x22 || 0x2 || Big-endian u16 size for the data starting at +0x48 (+0x38 with EncryptionType3), and must match {total frame size relative to +0x0 above} - {header_size}.
 |-
 | 0x24 || 0x4 || Big-endian u32 Counter. The initial value is randomly-generated. This is incremented each time the below content is updated (including initial creation). Also used by the Station to determine whether the frame changed compared to a previous one. When comparing against a previous frame, new_counter-prev_counter must be <= 0xFF, and the counters must not match.
@@ Line 1,666: / Line 1,666: @@
 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. For EncryptionType1-2:
+The content data at +{above_header_size} follows, which has the size specified above (which must be >=0x500 with EncryptionType1-2), where all fields are big-endian. For EncryptionType1-2:
 {| class="wikitable" border="1"