Loading tor-spec.txt +10 −10 Changes for tor-spec.txt: 10 added lines, 10 removed lines. Original line number Diff line number Diff line Loading @@ -163,7 +163,7 @@ which reveals the downstream node. First, the OP generates a pair of 8-byte symmetric keys (one [K_f] for the 'forward' stream from OP to OR, and one [K_b] for the 'backward' stream from OR to OP. [K_b] for the 'backward' stream from OR to OP). The OP generates a message [M] in the following format: Maximum bandwidth (bytes/s) [4 bytes] Loading Loading @@ -223,15 +223,15 @@ which reveals the downstream node. 3. Cell Packet format The basic unit of communication for onion routers and onion proxies is a fixed-width "Cell." Each Cell contains the following proxies is a fixed-width "cell". Each cell contains the following fields: ACI (anonymous circuit identifier) [2 bytes] Command [1 byte] Length [1 byte] Sequence number (unused, set to 0) [4 bytes] Payload (padded with 0 bytes) [120 bytes] [Total size: 128 bytes] Payload (padded with 0 bytes) [248 bytes] [Total size: 256 bytes] The 'Command' field holds one of the following values: 0 -- PADDING (Padding) (See Sec 6.2) Loading @@ -242,10 +242,10 @@ which reveals the downstream node. The interpretation of 'Length' and 'Payload' depend on the type of the cell. PADDING: Length is 0; Payload is 120 bytes of 0's. CREATE: Length is a value between 1 and 120; the first 'length' PADDING: Length is 0; Payload is 248 bytes of 0's. CREATE: Length is a value between 1 and 248; the first 'length' bytes of payload contain a portion of an onion. DATA: Length is a value between 4 and 120; the first 'length' DATA: Length is a value between 4 and 248; the first 'length' bytes of payload contain useful data. DESTROY: Neither field is used. SENDME: Length encodes a window size, payload is unused. Loading Loading @@ -335,10 +335,10 @@ which reveals the downstream node. side, then let the high bit of the ACI be 1, else 0. 3. To send M over the wire, prepend a 4-byte integer containing Len(M). Call the result M'. Let N=ceil(Len(M')/120). Len(M). Call the result M'. Let N=ceil(Len(M')/248). Divide M' into N chunks, such that: Chunk_I = M'[(I-1)*120:I*120] for 1 <= I <= N-1 Chunk_N = M'[(N-1)*120:Len(M')] Chunk_I = M'[(I-1)*248:I*248] for 1 <= I <= N-1 Chunk_N = M'[(N-1)*248:Len(M')] 4. Send N CREATE cells along the connection, setting the ACI on each to the selected ACI, setting the payload on each to Loading Loading
tor-spec.txt +10 −10 Changes for tor-spec.txt: 10 added lines, 10 removed lines. Original line number Diff line number Diff line Loading @@ -163,7 +163,7 @@ which reveals the downstream node. First, the OP generates a pair of 8-byte symmetric keys (one [K_f] for the 'forward' stream from OP to OR, and one [K_b] for the 'backward' stream from OR to OP. [K_b] for the 'backward' stream from OR to OP). The OP generates a message [M] in the following format: Maximum bandwidth (bytes/s) [4 bytes] Loading Loading @@ -223,15 +223,15 @@ which reveals the downstream node. 3. Cell Packet format The basic unit of communication for onion routers and onion proxies is a fixed-width "Cell." Each Cell contains the following proxies is a fixed-width "cell". Each cell contains the following fields: ACI (anonymous circuit identifier) [2 bytes] Command [1 byte] Length [1 byte] Sequence number (unused, set to 0) [4 bytes] Payload (padded with 0 bytes) [120 bytes] [Total size: 128 bytes] Payload (padded with 0 bytes) [248 bytes] [Total size: 256 bytes] The 'Command' field holds one of the following values: 0 -- PADDING (Padding) (See Sec 6.2) Loading @@ -242,10 +242,10 @@ which reveals the downstream node. The interpretation of 'Length' and 'Payload' depend on the type of the cell. PADDING: Length is 0; Payload is 120 bytes of 0's. CREATE: Length is a value between 1 and 120; the first 'length' PADDING: Length is 0; Payload is 248 bytes of 0's. CREATE: Length is a value between 1 and 248; the first 'length' bytes of payload contain a portion of an onion. DATA: Length is a value between 4 and 120; the first 'length' DATA: Length is a value between 4 and 248; the first 'length' bytes of payload contain useful data. DESTROY: Neither field is used. SENDME: Length encodes a window size, payload is unused. Loading Loading @@ -335,10 +335,10 @@ which reveals the downstream node. side, then let the high bit of the ACI be 1, else 0. 3. To send M over the wire, prepend a 4-byte integer containing Len(M). Call the result M'. Let N=ceil(Len(M')/120). Len(M). Call the result M'. Let N=ceil(Len(M')/248). Divide M' into N chunks, such that: Chunk_I = M'[(I-1)*120:I*120] for 1 <= I <= N-1 Chunk_N = M'[(N-1)*120:Len(M')] Chunk_I = M'[(I-1)*248:I*248] for 1 <= I <= N-1 Chunk_N = M'[(N-1)*248:Len(M')] 4. Send N CREATE cells along the connection, setting the ACI on each to the selected ACI, setting the payload on each to Loading
