TCPM

Internet Engineering Task Force (IETF)                          J. Touch
Internet Draft
Request for Comments: 9235                        Independent consultant
Intended status: Consultant
Category: Informational                                    J. Kuusisaari
Expires: September 2022
ISSN: 2070-1721                                                 Infinera
                                                          March 3,
                                                                May 2022

                            TCP-AO

            TCP Authentication Option (TCP-AO) Test Vectors
                  draft-ietf-tcpm-ao-test-vectors-09.txt

Abstract

   This document provides test vectors to validate implementations of
   the two mandatory authentication algorithms specified for the TCP
   Authentication Option over both IPv4 and IPv6.  This includes
   validation of the key derivation function (KDF) based on a set of
   test connection parameters as well as validation of the message
   authentication code (MAC).  Vectors are provided for both currently
   required pairs of KDF and MAC algorithms: KDF_HMAC_SHA1 and HMAC-
   SHA-1-96, and KDF_AES_128_CMAC and AES-128-CMAC-96.  The vectors also
   validate both whole TCP segments as well as segments whose options
   are excluded for middlebox traversal.

Status of this This Memo

   This Internet-Draft document is submitted in full conformance with the
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   Internet-Drafts are working documents not an Internet Standards Track specification; it is
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   https://www.rfc-editor.org/info/rfc9235.

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Table of Contents

   1. Introduction...................................................3  Introduction
   2.  Conventions used Used in this document..............................4 This Document
   3.  Input Test Vectors.............................................4 Vectors
     3.1.  TCP Connection Parameters.................................4 Parameters
       3.1.1.  TCP-AO parameters....................................4 Parameters
       3.1.2.  Active (client) side parameters......................4 (Client) Side Parameters
       3.1.3.  Passive (server) side parameters.....................5 (Server) Side Parameters
       3.1.4.  Other IP fields Fields and options..........................5 Options
       3.1.5.  Other TCP fields Fields and options.........................5 Options
   4.  IPv4 SHA-1 Output Test Vectors.................................5 Vectors
     4.1.  HMAC-SHA-1-96 (default (Default - covers Covers TCP options)..............6 Options)
       4.1.1.  Send (client) (Client) SYN (covers options)...................6 (Covers Options)
       4.1.2.  Receive (server) (Server) SYN-ACK (covers options)............6 (Covers Options)
       4.1.3.  Send (client) non-SYN (covers options)...............7 (Client) Non-SYN (Covers Options)
       4.1.4.  Receive (server) non-SYN (covers options)............7 (Server) Non-SYN (Covers Options)
     4.2.  HMAC-SHA-1-96 (omits (Omits TCP options).........................8 Options)
       4.2.1.  Send (client) (Client) SYN (omits options)....................8 (Omits Options)
       4.2.2.  Receive (server) (Server) SYN-ACK (omits options).............8 (Omits Options)
       4.2.3.  Send (client) non-SYN (omits options)................9 (Client) Non-SYN (Omits Options)
       4.2.4.  Receive (server) non-SYN (omits options)............10 (Server) Non-SYN (Omits Options)
   5.  IPv4 AES-128 Output Test Vectors..............................10 Vectors
     5.1.  AES-128-CMAC-96 (default (Default - covers Covers TCP options)...........10 Options)
       5.1.1.  Send (client) (Client) SYN (covers options)..................10 (Covers Options)
       5.1.2.  Receive (server) (Server) SYN-ACK (covers options)...........11 (Covers Options)
       5.1.3.  Send (client) non-SYN (covers options)..............12 (Client) Non-SYN (Covers Options)
       5.1.4.  Receive (server) non-SYN (covers options)...........12 (Server) Non-SYN (Covers Options)
     5.2.  AES-128-CMAC-96 (omits (Omits TCP options)......................13 Options)
       5.2.1.  Send (client) (Client) SYN (omits options)...................13 (Omits Options)
       5.2.2.  Receive (server) (Server) SYN-ACK (omits options)............13 (Omits Options)
       5.2.3.  Send (client) non-SYN (omits options)...............14 (Client) Non-SYN (Omits Options)
       5.2.4.  Receive (server) non-SYN (omits options)............14 (Server) Non-SYN (Omits Options)
   6.  IPv6 SHA-1 Output Test Vectors................................15 Vectors
     6.1.  HMAC-SHA-1-96 (default (Default - covers Covers TCP options).............15 Options)
       6.1.1.  Send (client) (Client) SYN (covers options)..................15 (Covers Options)
       6.1.2.  Receive (server) (Server) SYN-ACK (covers options)...........16 (Covers Options)
       6.1.3.  Send (client) non-SYN (covers options)..............16 (Client) Non-SYN (Covers Options)
       6.1.4.  Receive (server) non-SYN (covers options)...........17 (Server) Non-SYN (Covers Options)
     6.2.  HMAC-SHA-1-96 (omits (Omits TCP options)........................18 Options)
       6.2.1.  Send (client) (Client) SYN (omits options)...................18 (Omits Options)
       6.2.2.  Receive (server) (Server) SYN-ACK (omits options)............18 (Omits Options)
       6.2.3.  Send (client) non-SYN (omits options)...............19 (Client) Non-SYN (Omits Options)
       6.2.4.  Receive (server) non-SYN (omits options)............19 (Server) Non-SYN (Omits Options)
   7.  IPv6 AES-128 Output Test Vectors..............................20 Vectors
     7.1.  AES-128-CMAC-96 (default (Default - covers Covers TCP options)...........20 Options)
       7.1.1.  Send (client) (Client) SYN (covers options)..................20 (Covers Options)
       7.1.2.  Receive (server) (Server) SYN-ACK (covers options)...........21 (Covers Options)
       7.1.3.  Send (client) non-SYN (covers options)..............21 (Client) Non-SYN (Covers Options)
       7.1.4.  Receive (server) non-SYN (covers options)...........22 (Server) Non-SYN (Covers Options)
     7.2.  AES-128-CMAC-96 (omits (Omits TCP options)......................23 Options)
       7.2.1.  Send (client) (Client) SYN (omits options)...................23 (Omits Options)
       7.2.2.  Receive (server) (Server) SYN-ACK (omits options)............23 (Omits Options)
       7.2.3.  Send (client) non-SYN (omits options)...............24 (Client) Non-SYN (Omits Options)
       7.2.4.  Receive (server) non-SYN (omits options)............24 (Server) Non-SYN (Omits Options)
   8.  Observed Implementation Errors................................25 Errors
     8.1.  Algorithm issues.........................................25 Issues
     8.2.  Algorithm parameters.....................................25 Parameters
     8.3.  String handling issues...................................26 Handling Issues
     8.4.  Header coverage issues...................................26 Coverage Issues
   9.  Security Considerations.......................................26 Considerations
   10. IANA Considerations..........................................26 Considerations
   11. References...................................................27 References
     11.1.  Normative References....................................27 References
     11.2.  Informative References..................................27
   12. Acknowledgments..............................................28 References
   Acknowledgments
   Authors' Addresses

1.  Introduction

   This document provides test vectors to validate the correct
   implementation of the TCP Authentication Option (TCP-AO) [RFC5925]
   and its mandatory cryptographic algorithms defined in [RFC5926].  It
   includes the specification of all endpoint parameters to generate the
   variety of TCP segments covered by different keys and MAC coverage,
   i.e., both the default case and the variant where TCP options are
   ignored for middlebox traversal.  It also includes both default key
   derivation functions (KDFs) and MAC generation algorithms [RFC5926]
   and lists common pitfalls of implementing the algorithms correctly.

   The experimental extension to support NAT traversal [RFC6978] is not
   included in the provided test vectors.

   This document provides test vectors from multiple implementations
   that have been validated against each other for interoperability.

2.  Conventions used Used in this document This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Input Test Vectors

3.1.  TCP Connection Parameters

   The following parameters are used throughout this suite of test
   vectors.  The terms 'active' and 'passive' are used as defined for
   TCP [RFC793]. [RFC0793].

3.1.1.  TCP-AO parameters Parameters

   The following values are used for all exchanges.  This suite does not
   test key switchover.  The KeyIDs are as indicated for TCP-AO
   [RFC5925].  The Master_Key is used to derive the traffic keys
   [RFC5926].

      Active (client) side KeyID: 61 decimal (0x3d hexadecimal)

      Passive (server) side KeyID: 84 decimal (0x54 hexadecimal)

      Master_Key: "testvector" (length = 10 bytes)

3.1.2.  Active (client) side parameters (Client) Side Parameters

   The following endpoint parameters are used on the active side of the
   TCP connection, i.e., the side that initiates the TCP SYN.

      For IPv4: 10.11.12.13 (dotted decimal)

      For IPv6: fd00::1 (IPv6 hexadecimal)

      TCP port: (varies)

3.1.3.  Passive (server) side parameters (Server) Side Parameters

   The following endpoint parameters are used for the passive side of
   the TCP connection, i.e., the side that responds with a TCP SYN-ACK.

      For IPv4: 172.27.28.29 (dotted decimal)

      For IPv6: fd00::2 (IPv6 hexadecimal)

      TCP port = 179 decimal (BGP)

3.1.4.  Other IP fields Fields and options Options

   No IP options are used in these test vectors.

   All IPv4 packets use the following other parameters [RFC791]: DSCP [RFC0791]:
   Differentiated Services Code Point (DSCP) = 111000 binary (CS7) as is
   typical for BGP, ECN Explicit Congestion Notification (ECN) = 00 binary,
   set DF, the Don't Fragment (DF) bit, and clear MF. the More Fragments (MF)
   bit.

   IPv4 uses a TTL of 255 decimal; IPv6 uses a hop limit of 255 decimal.

   All IPv6 packets use the following other parameters [RFC8200]:
   traffic class = 0xe0 hexadecimal (DSCP = 111000 binary CS7, as is
   typical for BGP, with ECN = 00 binary) and no EHs. Extension Headers
   (EHs).

3.1.5.  Other TCP fields Fields and options Options

   The SYN and SYN-ACK segments include MSS [RFC793], NOP, WindowScale Maximum Segment Size (MSS)
   [RFC0793], No Operation (NOP), Window Scale [RFC7323], SACK Permitted Selective
   Acknowledgment (SACK) permitted [RFC2018], TimeStamp Timestamp [RFC7323], and
   TCP-AO [RFC5925], in that order.

   All other example segments include NOP, NOP, TimeStamp, Timestamp, and TCP-AO,
   in that order.

   All segment URG urgent (URG) pointers are zero [RFC793]. [RFC0793].  All segments
   with data set the PSH push (PSH) flag [RFC793]. [RFC0793].

   Each TCP connection below uses the Initial Sequence Numbers (ISNs) as
   indicated at the front of each corresponding section.

4.  IPv4 SHA-1 Output Test Vectors

   The SHA-1 KDF and MAC algorithms, KDF_HMAC_SHA1 and HMAC-SHA-1-96,
   are computed as specified for TCP-AO [RFC5926].

   In the following sections, all values are indicated as 2-digit
   hexadecimal values with spacing per line representing the contents of
   16 consecutive bytes, as is typical for data dumps.  The IP/TCP data
   indicates the entire IP packet, including the TCP segment and its
   options (whether covered by TCP-AO or not, as indicated), including
   TCP-AO.

4.1.  HMAC-SHA-1-96 (default (Default - covers Covers TCP options) Options)

4.1.1.  Send (client) (Client) SYN (covers options) (Covers Options)

   Client ISN = 0xfbfbab5a

   Send_SYN_traffic_key:

     6d 63 ef 1b 02 fe 15 09 d4 b1 40 27 07 fd 7b 04
     16 ab b7 4f

   IPv4/TCP:

     45 e0 00 4c dd 0f 40 00 ff 06 bf 6b 0a 0b 0c 0d
     ac 1b 1c 1d e9 d7 00 b3 fb fb ab 5a 00 00 00 00
     e0 02 ff ff ca c4 00 00 02 04 05 b4 01 03 03 08
     04 02 08 0a 00 15 5a b7 00 00 00 00 1d 10 3d 54
     2e e4 37 c6 f8 ed e6 d7 c4 d6 02 e7

   MAC:

     2e e4 37 c6 f8 ed e6 d7 c4 d6 02 e7

4.1.2.  Receive (server) (Server) SYN-ACK (covers options) (Covers Options)

   Server ISN = 0x11c14261

   Receive_SYN_traffic_key:

     d9 e2 17 e4 83 4a 80 ca 2f 3f d8 de 2e 41 b8 e6
     79 7f ea 96

   IPv4/TCP:

     45 e0 00 4c 65 06 40 00 ff 06 37 75 ac 1b 1c 1d
     0a 0b 0c 0d 00 b3 e9 d7 11 c1 42 61 fb fb ab 5b
     e0 12 ff ff 37 76 00 00 02 04 05 b4 01 03 03 08
     04 02 08 0a 84 a5 0b eb 00 15 5a b7 1d 10 54 3d
     ee ab 0f e2 4c 30 10 81 51 16 b3 be

   MAC:

     ee ab 0f e2 4c 30 10 81 51 16 b3 be

4.1.3.  Send (client) non-SYN (covers options) (Client) Non-SYN (Covers Options)

   Send_other_traffic_key:

     d2 e5 9c 65 ff c7 b1 a3 93 47 65 64 63 b7 0e dc
     24 a1 3d 71

   IPv4/TCP:

     45 e0 00 87 36 a1 40 00 ff 06 65 9f 0a 0b 0c 0d
     ac 1b 1c 1d e9 d7 00 b3 fb fb ab 5b 11 c1 42 62
     c0 18 01 04 a1 62 00 00 01 01 08 0a 00 15 5a c1
     84 a5 0b eb 1d 10 3d 54 70 64 cf 99 8c c6 c3 15
     c2 c2 e2 bf ff ff ff ff ff ff ff ff ff ff ff ff
     ff ff ff ff 00 43 01 04 da bf 00 b4 0a 0b 0c 0d
     26 02 06 01 04 00 01 00 01 02 02 80 00 02 02 02
     00 02 02 42 00 02 06 41 04 00 00 da bf 02 08 40
     06 00 64 00 01 01 00

   MAC:

     70 64 cf 99 8c c6 c3 15 c2 c2 e2 bf

4.1.4.  Receive (server) non-SYN (covers options) (Server) Non-SYN (Covers Options)

   Receive_other_traffic_key:

     d9 e2 17 e4 83 4a 80 ca 2f 3f d8 de 2e 41 b8 e6
     79 7f ea 96

   IPv4/TCP:

     45 e0 00 87 1f a9 40 00 ff 06 7c 97 ac 1b 1c 1d
     0a 0b 0c 0d 00 b3 e9 d7 11 c1 42 62 fb fb ab 9e
     c0 18 01 00 40 0c 00 00 01 01 08 0a 84 a5 0b f5
     00 15 5a c1 1d 10 54 3d a6 3f 0e cb bb 2e 63 5c
     95 4d ea c7 ff ff ff ff ff ff ff ff ff ff ff ff
     ff ff ff ff 00 43 01 04 da c0 00 b4 ac 1b 1c 1d
     26 02 06 01 04 00 01 00 01 02 02 80 00 02 02 02
     00 02 02 42 00 02 06 41 04 00 00 da c0 02 08 40
     06 00 64 00 01 01 00

   MAC:

     a6 3f 0e cb bb 2e 63 5c 95 4d ea c7

4.2.  HMAC-SHA-1-96 (omits (Omits TCP options) Options)

4.2.1.  Send (client) (Client) SYN (omits options) (Omits Options)

   Client ISN = 0xcb0efbee

   Send_SYN_traffic_key:

     30 ea a1 56 0c f0 be 57 da b5 c0 45 22 9f b1 0a
     42 3c d7 ea

   IPv4/TCP:

     45 e0 00 4c 53 99 40 00 ff 06 48 e2 0a 0b 0c 0d
     ac 1b 1c 1d ff 12 00 b3 cb 0e fb ee 00 00 00 00
     e0 02 ff ff 54 1f 00 00 02 04 05 b4 01 03 03 08
     04 02 08 0a 00 02 4c ce 00 00 00 00 1d 10 3d 54
     80 af 3c fe b8 53 68 93 7b 8f 9e c2

   MAC:

     80 af 3c fe b8 53 68 93 7b 8f 9e c2

4.2.2.  Receive (server) (Server) SYN-ACK (omits options) (Omits Options)

   Server ISN = 0xacd5b5e1

   Receive_SYN_traffic_key:

     b5 b2 89 6b b3 66 4e 81 76 b0 ed c6 e7 99 52 41a
     01 a8 30 7f

   IPv4/TCP:

     45 e0 00 4c 32 84 40 00 ff 06 69 f7 ac 1b 1c 1d
     0a 0b 0c 0d 00 b3 ff 12 ac d5 b5 e1 cb 0e fb ef
     e0 12 ff ff 38 8e 00 00 02 04 05 b4 01 03 03 08
     04 02 08 0a 57 67 72 f3 00 02 4c ce 1d 10 54 3d
     09 30 6f 9a ce a6 3a 8c 68 cb 9a 70

   MAC:

     09 30 6f 9a ce a6 3a 8c 68 cb 9a 70

4.2.3.  Send (client) non-SYN (omits options) (Client) Non-SYN (Omits Options)

   Send_other_traffic_key:

     f3 db 17 93 d7 91 0e cd 80 6c 34 f1 55 ea 1f 00
     34 59 53 e3

   IPv4/TCP:

     45 e0 00 87 a8 f5 40 00 ff 06 f3 4a 0a 0b 0c 0d
     ac 1b 1c 1d ff 12 00 b3 cb 0e fb ef ac d5 b5 e2
     c0 18 01 04 6c 45 00 00 01 01 08 0a 00 02 4c ce
     57 67 72 f3 1d 10 3d 54 71 06 08 cc 69 6c 03 a2
     71 c9 3a a5 ff ff ff ff ff ff ff ff ff ff ff ff
     ff ff ff ff 00 43 01 04 da bf 00 b4 0a 0b 0c 0d
     26 02 06 01 04 00 01 00 01 02 02 80 00 02 02 02
     00 02 02 42 00 02 06 41 04 00 00 da bf 02 08 40
     06 00 64 00 01 01 00

   MAC:

     71 06 08 cc 69 6c 03 a2 71 c9 3a a5

4.2.4.  Receive (server) non-SYN (omits options) (Server) Non-SYN (Omits Options)

   Receive_other_traffic_key:

     b5 b2 89 6b b3 66 4e 81 76 b0 ed c6 e7 99 52 41
     01 a8 30 7f

   IPv4/TCP:

     45 e0 00 87 54 37 40 00 ff 06 48 09 ac 1b 1c 1d
     0a 0b 0c 0d 00 b3 ff 12 ac d5 b5 e2 cb 0e fc 32
     c0 18 01 00 46 b6 00 00 01 01 08 0a 57 67 72 f3
     00 02 4c ce 1d 10 54 3d 97 76 6e 48 ac 26 2d e9
     ae 61 b4 f9 ff ff ff ff ff ff ff ff ff ff ff ff
     ff ff ff ff 00 43 01 04 da c0 00 b4 ac 1b 1c 1d
     26 02 06 01 04 00 01 00 01 02 02 80 00 02 02 02
     00 02 02 42 00 02 06 41 04 00 00 da c0 02 08 40
     06 00 64 00 01 01 00

   MAC:

     97 76 6e 48 ac 26 2d e9 ae 61 b4 f9

5.  IPv4 AES-128 Output Test Vectors

   The AES-128 KDF and MAC algorithms, KDF_AES_128_CMAC and AES-128-
   CMAC-96, are computed as specified for TCP-AO [RFC5926].

   In the following sections, all values are indicated as 2-digit
   hexadecimal values with spacing per line representing the contents of
   16 consecutive bytes, as is typical for data dumps.  The IP/TCP data
   indicates the entire IP packet, including the TCP segment and its
   options (whether covered by TCP-AO or not, as indicated), including
   TCP-AO.

5.1.  AES-128-CMAC-96 (default (Default - covers Covers TCP options) Options)

5.1.1.  Send (client) (Client) SYN (covers options) (Covers Options)

   Client ISN = 0x787a1ddf

   Send_SYN_traffic_key:

     f5 b8 b3 d5 f3 4f db b6 eb 8d 4a b9 66 0e 60 e3

   IP/TCP:

     45 e0 00 4c 7b 9f 40 00 ff 06 20 dc 0a 0b 0c 0d
     ac 1b 1c 1d c4 fa 00 b3 78 7a 1d df 00 00 00 00
     e0 02 ff ff 5a 0f 00 00 02 04 05 b4 01 03 03 08
     04 02 08 0a 00 01 7e d0 00 00 00 00 1d 10 3d 54
     e4 77 e9 9c 80 40 76 54 98 e5 50 91

   MAC:

     e4 77 e9 9c 80 40 76 54 98 e5 50 91

5.1.2.  Receive (server) (Server) SYN-ACK (covers options) (Covers Options)

   Server ISN = 0xfadd6de9

   Receive_SYN_traffic_key:

     4b c7 57 1a 48 6f 32 64 bb d8 88 47 40 66 b4 b1

   IPv4/TCP:

     45 e0 00 4c 4b ad 40 00 ff 06 50 ce ac 1b 1c 1d
     0a 0b 0c 0d 00 b3 c4 fa fa dd 6d e9 78 7a 1d e0
     e0 12 ff ff f3 f2 00 00 02 04 05 b4 01 03 03 08
     04 02 08 0a 93 f4 e9 e8 00 01 7e d0 1d 10 54 3d
     d6 ad a7 bc 4c dd 53 6d 17 69 db 5f

   MAC:

     d6 ad a7 bc 4c dd 53 6d 17 69 db 5f

5.1.3.  Send (client) non-SYN (covers options) (Client) Non-SYN (Covers Options)

   Send_other_traffic_key:

     8c 8a e0 e8 37 1e c5 cb b9 7e a7 9d 90 41 83 91

   IPv4/TCP:

     45 e0 00 87 fb 4f 40 00 ff 06 a0 f0 0a 0b 0c 0d
     ac 1b 1c 1d c4 fa 00 b3 78 7a 1d e0 fa dd 6d ea
     c0 18 01 04 95 05 00 00 01 01 08 0a 00 01 7e d0
     93 f4 e9 e8 1d 10 3d 54 77 41 27 42 fa 4d c4 33
     ef f0 97 3e ff ff ff ff ff ff ff ff ff ff ff ff
     ff ff ff ff 00 43 01 04 da bf 00 b4 0a 0b 0c 0d
     26 02 06 01 04 00 01 00 01 02 02 80 00 02 02 02
     00 02 02 42 00 02 06 41 04 00 00 da bf 02 08 40
     06 00 64 00 01 01 00

   MAC:

     77 41 27 42 fa 4d c4 33 ef f0 97 3e

5.1.4.  Receive (server) non-SYN (covers options) (Server) Non-SYN (Covers Options)

   Receive_other_traffic_key:

     4b c7 57 1a 48 6f 32 64 bb d8 88 47 40 66 b4 b1

   IPv4/TCP:

     45 e0 00 87 b9 14 40 00 ff 06 e3 2b ac 1b 1c 1d
     0a 0b 0c 0d 00 b3 c4 fa fa dd 6d ea 78 7a 1e 23
     c0 18 01 00 e7 db 00 00 01 01 08 0a 93 f4 e9 e8
     00 01 7e d0 1d 10 54 3d f6 d9 65 a7 83 82 a7 48
     45 f7 2d ac ff ff ff ff ff ff ff ff ff ff ff ff
     ff ff ff ff 00 43 01 04 da c0 00 b4 ac 1b 1c 1d
     26 02 06 01 04 00 01 00 01 02 02 80 00 02 02 02
     00 02 02 42 00 02 06 41 04 00 00 da c0 02 08 40
     06 00 64 00 01 01 00

   MAC:

     f6 d9 65 a7 83 82 a7 48 45 f7 2d ac

5.2.  AES-128-CMAC-96 (omits (Omits TCP options) Options)

5.2.1.  Send (client) (Client) SYN (omits options) (Omits Options)

   Client ISN = 0x389bed71

   Send_SYN_traffic_key:

     2c db ae 13 92 c4 94 49 fa 92 c4 50 97 35 d5 0e

   IPv4/TCP:

     45 e0 00 4c f2 2e 40 00 ff 06 aa 4c 0a 0b 0c 0d
     ac 1b 1c 1d da 1c 00 b3 38 9b ed 71 00 00 00 00
     e0 02 ff ff 70 bf 00 00 02 04 05 b4 01 03 03 08
     04 02 08 0a 00 01 85 e1 00 00 00 00 1d 10 3d 54
     c4 4e 60 cb 31 f7 c0 b1 de 3d 27 49

   MAC:

     c4 4e 60 cb 31 f7 c0 b1 de 3d 27 49

5.2.2.  Receive (server) (Server) SYN-ACK (omits options) (Omits Options)

   Server ISN = 0xd3844a6f

   Receive_SYN_traffic_key:

     3c e6 7a 55 18 69 50 6b 63 47 b6 33 c5 0a 62 4a

   IPv4/TCP:

     45 e0 00 4c 6c c0 40 00 ff 06 2f bb ac 1b 1c 1d
     0a 0b 0c 0d 00 b3 da 1c d3 84 4a 6f 38 9b ed 72
     e0 12 ff ff e4 45 00 00 02 04 05 b4 01 03 03 08
     04 02 08 0a ce 45 98 38 00 01 85 e1 1d 10 54 3d
     3a 6a bb 20 7e 49 b1 be 71 36 db 90

   MAC:

     3a 6a bb 20 7e 49 b1 be 71 36 db 90

5.2.3.  Send (client) non-SYN (omits options) (Client) Non-SYN (Omits Options)

   Send_other_traffic_key:

     03 5b c4 00 a3 41 ff e5 95 f5 9f 58 00 50 06 ca

   IPv4/TCP:

     45 e0 00 87 ee 91 40 00 ff 06 ad ae 0a 0b 0c 0d
     ac 1b 1c 1d da 1c 00 b3 38 9b ed 72 d3 84 4a 70
     c0 18 01 04 88 51 00 00 01 01 08 0a 00 01 85 e1
     ce 45 98 38 1d 10 3d 54 75 85 e9 e9 d5 c3 ec 85
     7b 96 f8 37 ff ff ff ff ff ff ff ff ff ff ff ff
     ff ff ff ff 00 43 01 04 da bf 00 b4 0a 0b 0c 0d
     26 02 06 01 04 00 01 00 01 02 02 80 00 02 02 02
     00 02 02 42 00 02 06 41 04 00 00 da bf 02 08 40
     06 00 64 00 01 01 00

   MAC:

     75 85 e9 e9 d5 c3 ec 85 7b 96 f8 37

5.2.4.  Receive (server) non-SYN (omits options) (Server) Non-SYN (Omits Options)

   Receive_other_traffic_key:

     3c e6 7a 55 18 69 50 6b 63 47 b6 33 c5 0a 62 4a

   IPv4/TCP:

     45 e0 00 87 6a 21 40 00 ff 06 32 1f ac 1b 1c 1d
     0a 0b 0c 0d 00 b3 da 1c d3 84 4a 70 38 9b ed 72
     c0 18 01 00 04 49 00 00 01 01 08 0a ce 45 98 38
     00 01 85 e1 1d 10 54 3d 5c 04 0f d9 23 33 04 76
     5c 09 82 f4 ff ff ff ff ff ff ff ff ff ff ff ff
     ff ff ff ff 00 43 01 04 da c0 00 b4 ac 1b 1c 1d
     26 02 06 01 04 00 01 00 01 02 02 80 00 02 02 02
     00 02 02 42 00 02 06 41 04 00 00 da c0 02 08 40
     06 00 64 00 01 01 00

   MAC:

     5c 04 0f d9 23 33 04 76 5c 09 82 f4

6.  IPv6 SHA-1 Output Test Vectors

   The SHA-1 KDF and MAC algorithms, KDF_HMAC_SHA1 and HMAC-SHA-1-96,
   are computed as specified for TCP-AO [RFC5926].

6.1.  HMAC-SHA-1-96 (default (Default - covers Covers TCP options) Options)

6.1.1.  Send (client) (Client) SYN (covers options) (Covers Options)

   Client ISN = 0x176a833f

   Send_SYN_traffic_key:

     62 5e c0 9d 57 58 36 ed c9 b6 42 84 18 bb f0 69
     89 a3 61 bb

   IPv6/TCP:

     6e 08 91 dc 00 38 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 f7 e4 00 b3 17 6a 83 3f
     00 00 00 00 e0 02 ff ff 47 21 00 00 02 04 05 a0
     01 03 03 08 04 02 08 0a 00 41 d0 87 00 00 00 00
     1d 10 3d 54 90 33 ec 3d 73 34 b6 4c 5e dd 03 9f

   MAC:

     90 33 ec 3d 73 34 b6 4c 5e dd 03 9f

6.1.2.  Receive (server) (Server) SYN-ACK (covers options) (Covers Options)

   Server ISN = 0x3f51994b

   Receive_SYN_traffic_key:

     e4 a3 7a da 2a 0a fc a8 71 14 34 91 3f e1 38 c7
     71 eb cb 4a

   IPv6/TCP:

     6e 01 00 9e 00 38 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 00 b3 f7 e4 3f 51 99 4b
     17 6a 83 40 e0 12 ff ff bf ec 00 00 02 04 05 a0
     01 03 03 08 04 02 08 0a bd 33 12 9b 00 41 d0 87
     1d 10 54 3d f1 cb a3 46 c3 52 61 63 f7 1f 1f 55

   MAC:

     f1 cb a3 46 c3 52 61 63 f7 1f 1f 55

6.1.3.  Send (client) non-SYN (covers options) (Client) Non-SYN (Covers Options)

   Send_other_traffic_key:

     1e d8 29 75 f4 ea 44 4c 61 58 0c 5b d9 0d bd 61
     bb c9 1b 7e

   IPv6/TCP:

     6e 08 91 dc 00 73 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 f7 e4 00 b3 17 6a 83 40
     3f 51 99 4c c0 18 01 00 32 9c 00 00 01 01 08 0a
     00 41 d0 91 bd 33 12 9b 1d 10 3d 54 bf 08 05 fe
     b4 ac 7b 16 3d 6f cd f2 ff ff ff ff ff ff ff ff
     ff ff ff ff ff ff ff ff 00 43 01 04 fd e8 00 b4
     01 01 01 79 26 02 06 01 04 00 01 00 01 02 02 80
     00 02 02 02 00 02 02 42 00 02 06 41 04 00 00 fd
     e8 02 08 40 06 00 64 00 01 01 00

   MAC:

     bf 08 05 fe b4 ac 7b 16 3d 6f cd f2

6.1.4.  Receive (server) non-SYN (covers options) (Server) Non-SYN (Covers Options)

   Receive_other_traffic_key:

     e4 a3 7a da 2a 0a fc a8 71 14 34 91 3f e1 38 c7
     71 eb cb 4a

   IPv6/TCP:

     6e 01 00 9e 00 73 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 00 b3 f7 e4 3f 51 99 4c
     17 6a 83 83 c0 18 01 00 ee 6e 00 00 01 01 08 0a
     bd 33 12 a5 00 41 d0 91 1d 10 54 3d 6c 48 12 5c
     11 33 5b ab 9a 07 a7 97 ff ff ff ff ff ff ff ff
     ff ff ff ff ff ff ff ff 00 43 01 04 fd e8 00 b4
     01 01 01 7a 26 02 06 01 04 00 01 00 01 02 02 80
     00 02 02 02 00 02 02 42 00 02 06 41 04 00 00 fd
     e8 02 08 40 06 00 64 00 01 01 00

   MAC:

     6c 48 12 5c 11 33 5b ab 9a 07 a7 97

6.2.  HMAC-SHA-1-96 (omits (Omits TCP options) Options)

6.2.1.  Send (client) (Client) SYN (omits options) (Omits Options)

   Client ISN = 0x020c1e69

   Send_SYN_traffic_key:

     31 a3 fa f6 9e ff ae 52 93 1b 7f 84 54 67 31 5c
     27 0a 4e dc

   IPv6/TCP:

     6e 07 8f cd 00 38 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 c6 cd 00 b3 02 0c 1e 69
     00 00 00 00 e0 02 ff ff a4 1a 00 00 02 04 05 a0
     01 03 03 08 04 02 08 0a 00 9d b9 5b 00 00 00 00
     1d 10 3d 54 88 56 98 b0 53 0e d4 d5 a1 5f 83 46

   MAC:

     88 56 98 b0 53 0e d4 d5 a1 5f 83 46

6.2.2.  Receive (server) (Server) SYN-ACK (omits options) (Omits Options)

   Server ISN = 0xeba3734d

   Receive_SYN_traffic_key:

     40 51 08 94 7f 99 65 75 e7 bd bc 26 d4 02 16 a2
     c7 fa 91 bd

   IPv6/TCP:

     6e 0a 7e 1f 00 38 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 00 b3 c6 cd eb a3 73 4d
     02 0c 1e 6a e0 12 ff ff 77 4d 00 00 02 04 05 a0
     01 03 03 08 04 02 08 0a 5e c9 9b 70 00 9d b9 5b
     1d 10 54 3d 3c 54 6b ad 97 43 f1 2d f8 b8 01 0d

   MAC:

     3c 54 6b ad 97 43 f1 2d f8 b8 01 0d

6.2.3.  Send (client) non-SYN (omits options) (Client) Non-SYN (Omits Options)

   Send_other_traffic_key:

     b3 4e ed 6a 93 96 a6 69 f1 c4 f4 f5 76 18 f3 65
     6f 52 c7 ab

   IPv6/TCP:

     6e 07 8f cd 00 73 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 c6 cd 00 b3 02 0c 1e 6a
     eb a3 73 4e c0 18 01 00 83 e6 00 00 01 01 08 0a
     00 9d b9 65 5e c9 9b 70 1d 10 3d 54 48 bd 09 3b
     19 24 e0 01 19 2f 5b f0 ff ff ff ff ff ff ff ff
     ff ff ff ff ff ff ff ff 00 43 01 04 fd e8 00 b4
     01 01 01 79 26 02 06 01 04 00 01 00 01 02 02 80
     00 02 02 02 00 02 02 42 00 02 06 41 04 00 00 fd
     e8 02 08 40 06 00 64 00 01 01 00

   MAC:

     48 bd 09 3b 19 24 e0 01 19 2f 5b f0

6.2.4.  Receive (server) non-SYN (omits options) (Server) Non-SYN (Omits Options)

   Receive_other_traffic_key:

     40 51 08 94 7f 99 65 75 e7 bd bc 26 d4 02 16 a2
     c7 fa 91 bd

   IPv6/TCP:

     6e 0a 7e 1f 00 73 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 00 b3 c6 cd eb a3 73 4e
     02 0c 1e ad c0 18 01 00 71 6a 00 00 01 01 08 0a
     5e c9 9b 7a 00 9d b9 65 1d 10 54 3d 55 9a 81 94
     45 b4 fd e9 8d 9e 13 17 ff ff ff ff ff ff ff ff
     ff ff ff ff ff ff ff ff 00 43 01 04 fd e8 00 b4
     01 01 01 7a 26 02 06 01 04 00 01 00 01 02 02 80
     00 02 02 02 00 02 02 42 00 02 06 41 04 00 00 fd
     e8 02 08 40 06 00 64 00 01 01 00

   MAC:

     55 9a 81 94 45 b4 fd e9 8d 9e 13 17

7.  IPv6 AES-128 Output Test Vectors

   The AES-128 KDF and MAC algorithms, KDF_AES_128_CMAC and AES-128-
   CMAC-96, are computed as specified for TCP-AO [RFC5926].

7.1.  AES-128-CMAC-96 (default (Default - covers Covers TCP options) Options)

7.1.1.  Send (client) (Client) SYN (covers options) (Covers Options)

   Client ISN = 0x193cccec

   Send_SYN_traffic_key:

     fa 5a 21 08 88 2d 39 d0 c7 19 29 17 5a b1 b7 b8

   IP/TCP:

     6e 04 a7 06 00 38 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 f8 5a 00 b3 19 3c cc ec
     00 00 00 00 e0 02 ff ff de 5d 00 00 02 04 05 a0
     01 03 03 08 04 02 08 0a 13 e4 ab 99 00 00 00 00
     1d 10 3d 54 59 b5 88 10 74 81 ac 6d c3 92 70 40

   MAC:

     59 b5 88 10 74 81 ac 6d c3 92 70 40

7.1.2.  Receive (server) (Server) SYN-ACK (covers options) (Covers Options)

   Server ISN = 0xa6744ecb

   Receive_SYN_traffic_key:

     cf 1b 1e 22 5e 06 a6 36 16 76 4a 06 7b 46 f4 b1

   IPv6/TCP:

     6e 06 15 20 00 38 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 00 b3 f8 5a a6 74 4e cb
     19 3c cc ed e0 12 ff ff ea bb 00 00 02 04 05 a0
     01 03 03 08 04 02 08 0a 71 da ab c8 13 e4 ab 99
     1d 10 54 3d dc 28 43 a8 4e 78 a6 bc fd c5 ed 80

   MAC:

     dc 28 43 a8 4e 78 a6 bc fd c5 ed 80

7.1.3.  Send (client) non-SYN (covers options) (Client) Non-SYN (Covers Options)

   Send_other_traffic_key:

     61 74 c3 55 7a be d2 75 74 db a3 71 85 f0 03 00

   IPv6/TCP:

     6e 04 a7 06 00 73 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 f8 5a 00 b3 19 3c cc ed
     a6 74 4e cc c0 18 01 00 32 80 00 00 01 01 08 0a
     13 e4 ab a3 71 da ab c8 1d 10 3d 54 7b 6a 45 5c
     0d 4f 5f 01 83 5b aa b3 ff ff ff ff ff ff ff ff
     ff ff ff ff ff ff ff ff 00 43 01 04 fd e8 00 b4
     01 01 01 79 26 02 06 01 04 00 01 00 01 02 02 80
     00 02 02 02 00 02 02 42 00 02 06 41 04 00 00 fd
     e8 02 08 40 06 00 64 00 01 01 00

   MAC:

     7b 6a 45 5c 0d 4f 5f 01 83 5b aa b3

7.1.4.  Receive (server) non-SYN (covers options) (Server) Non-SYN (Covers Options)

   Receive_other_traffic_key:

     cf 1b 1e 22 5e 06 a6 36 16 76 4a 06 7b 46 f4 b1

   IPv6/TCP:

     6e 06 15 20 00 73 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 00 b3 f8 5a a6 74 4e cc
     19 3c cd 30 c0 18 01 00 52 f4 00 00 01 01 08 0a
     71 da ab d3 13 e4 ab a3 1d 10 54 3d c1 06 9b 7d
     fd 3d 69 3a 6d f3 f2 89 ff ff ff ff ff ff ff ff
     ff ff ff ff ff ff ff ff 00 43 01 04 fd e8 00 b4
     01 01 01 7a 26 02 06 01 04 00 01 00 01 02 02 80
     00 02 02 02 00 02 02 42 00 02 06 41 04 00 00 fd
     e8 02 08 40 06 00 64 00 01 01 00

   MAC:

     c1 06 9b 7d fd 3d 69 3a 6d f3 f2 89

7.2.  AES-128-CMAC-96 (omits (Omits TCP options) Options)

7.2.1.  Send (client) (Client) SYN (omits options) (Omits Options)

   Client ISN = 0xb01da74a

   Send_SYN_traffic_key:

     a9 4f 51 12 63 e4 09 3d 35 dd 81 8c 13 bb bf 53

   IPv6/TCP:

     6e 09 3d 76 00 38 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 f2 88 00 b3 b0 1d a7 4a
     00 00 00 00 e0 02 ff ff 75 ff 00 00 02 04 05 a0
     01 03 03 08 04 02 08 0a 14 27 5b 3b 00 00 00 00
     1d 10 3d 54 3d 45 b4 34 2d e8 bb 15 30 84 78 98

   MAC:

     3d 45 b4 34 2d e8 bb 15 30 84 78 98

7.2.2.  Receive (server) (Server) SYN-ACK (omits options) (Omits Options)

   Server ISN = 0xa6246145

   Receive_SYN_traffic_key:

     92 de a5 bb c7 8b 1d 9f 5b 29 52 e9 cd 30 64 2a

   IPv6/TCP:

     6e 0c 60 0a 00 38 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 00 b3 f2 88 a6 24 61 45
     b0 1d a7 4b e0 12 ff ff a7 0c 00 00 02 04 05 a0
     01 03 03 08 04 02 08 0a 17 82 24 5b 14 27 5b 3b
     1d 10 54 3d 1d 01 f6 c8 7c 6f 93 ac ff a9 d4 b5

   MAC:

     1d 01 f6 c8 7c 6f 93 ac ff a9 d4 b5

7.2.3.  Send (client) non-SYN (omits options) (Client) Non-SYN (Omits Options)

   Send_other_traffic_key:

     4f b2 08 6e 40 2c 67 90 79 ed 65 d4 bf 97 69 3d

   IPv6/TCP:

     6e 09 3d 76 00 73 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 f2 88 00 b3 b0 1d a7 4b
     a6 24 61 46 c0 18 01 00 c3 6d 00 00 01 01 08 0a
     14 27 5b 4f 17 82 24 5b 1d 10 3d 54 29 0c f4 14
     cc b4 7a 33 32 76 e7 f8 ff ff ff ff ff ff ff ff
     ff ff ff ff ff ff ff ff 00 43 01 04 fd e8 00 b4
     01 01 01 79 26 02 06 01 04 00 01 00 01 02 02 80
     00 02 02 02 00 02 02 42 00 02 06 41 04 00 00 fd
     e8 02 08 40 06 00 64 00 01 01 00

   MAC:

     29 0c f4 14 cc b4 7a 33 32 76 e7 f8

7.2.4.  Receive (server) non-SYN (omits options) (Server) Non-SYN (Omits Options)

   Receive_other_traffic_key:

     92 de a5 bb c7 8b 1d 9f 5b 29 52 e9 cd 30 64 2a

   IPv6/TCP:

     6e 0c 60 0a 00 73 06 40 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 02 fd 00 00 00 00 00 00 00
     00 00 00 00 00 00 00 01 00 b3 f2 88 a6 24 61 46
     b0 1d a7 8e c0 18 01 00 34 51 00 00 01 01 08 0a
     17 82 24 65 14 27 5b 4f 1d 10 54 3d 99 51 5f fc
     d5 40 34 99 f6 19 fd 1b ff ff ff ff ff ff ff ff
     ff ff ff ff ff ff ff ff 00 43 01 04 fd e8 00 b4
     01 01 01 7a 26 02 06 01 04 00 01 00 01 02 02 80
     00 02 02 02 00 02 02 42 00 02 06 41 04 00 00 fd
     e8 02 08 40 06 00 64 00 01 01 00

   MAC:

     99 51 5f fc d5 40 34 99 f6 19 fd 1b

8.  Observed Implementation Errors

   The following is a partial list of implementation errors that this
   set of test vectors is intended to validate.

8.1.  Algorithm issues

   o  Underlying Issues

   *  The underlying implementation of HMAC-SHA-1-96 or AES-128-CMAC-96
      does not pass their corresponding test vectors [RFC2202]
      [RFC4493]

   o
      [RFC4493].

   *  The SNE algorithm does not consider corner cases, possibly because
      the pseudocode in [RFC5925] was not intended as complete, as
      discussed in [RFC9187], the latter of which includes its own
      validation sequence.

8.2.  Algorithm parameters

   o Parameters

   *  KDF context length is incorrect, e.g., it does not include TCP
      header length + payload length (it should, per Section 5.2 of
      TCP-AO
      [RFC5925])

   o [RFC5925]).

   *  KDF calculation does not start from counter i = 1 (it should, per
      Sec.
      Section 3.1.1 of the TCP-AO crypto algorithms [RFC5926])

   o [RFC5926]).

   *  KDF calculation does not include output length in bits, contained
      in two bytes in network byte order (it should, per Sec. Section 3.1.1
      of the TCP-AO crypto algorithms [RFC5926])
   o [RFC5926]).

   *  KDF uses keys generated from current TCP segment sequence numbers
      (KDF should use only local and remote ISNs or zero, as indicated
      in Sec. Section 5.2 of TCP-AO [RFC5925]) [RFC5925]).

8.3.  String handling issues Handling Issues

   The strings indicated in TCP-AO and its algorithms are indicated as a
   sequence of bytes of known length.  In some implementations, string
   lengths are indicated by a terminal value (e.g., zero in C).  This
   terminal value is not included as part of the string for
   calculations.

   o  Password

   *  The password includes the last zero-byte (it should not)

   o  Label not).

   *  The label "TCP-AO" includes the last zero byte (it should not) not).

8.4.  Header coverage issues

   o Coverage Issues

   *  TCP checksum and/or MAC is not zeroed properly before calculation
      (both should be)

   o be).

   *  TCP header is not included in the MAC calculation (it should be)

   o be).

   *  TCP options are not included in the MAC calculation by default.

   There is a separate parameter in the Master Key Tuple (MKT) [RFC5925]
   to ignore options; this document provides test vectors for both
   options-included and options-excluded cases.

9.  Security Considerations

   This document is intended to assist in the validation of
   implementations of TCP-AO, TCP-AO to further enable its more widespread use
   as a security mechanism to authenticate not only TCP payload contents
   but the TCP headers and protocol.

   The Master_Key of "testvector" used here for test vector generation
   SHOULD NOT be used operationally.

10.  IANA Considerations

   This document contains has no IANA issues. This section should be
   removed upon publication as an RFC. actions.

11.  References

11.1.  Normative References

   [RFC791]

   [RFC0791]  Postel, J., "Internet Protocol," Protocol", STD 5, RFC 791, Sept. 1981.

   [RFC793]
              DOI 10.17487/RFC0791, September 1981,
              <https://www.rfc-editor.org/info/rfc791>.

   [RFC0793]  Postel, J., "Transmission Control Protocol," Protocol", STD 7,
              RFC 793, DOI 10.17487/RFC0793, September 1981. 1981,
              <https://www.rfc-editor.org/info/rfc793>.

   [RFC2018]  Mathis, M., J. Mahdavi, S. J., Floyd, S., and A. Romanow, "TCP
              Selective Acknowledgment Options," Options", RFC 2018, Oct. 1996.
              DOI 10.17487/RFC2018, October 1996,
              <https://www.rfc-editor.org/info/rfc2018>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels," Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997. 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC5925]  Touch, J., A. Mankin, A., and R. Bonica, "The TCP
              Authentication
             Option," Option", RFC 5925, DOI 10.17487/RFC5925,
              June 2010. 2010, <https://www.rfc-editor.org/info/rfc5925>.

   [RFC5926]  Lebovitz, G., G. and E. Rescorla, "Cryptographic Algorithms
              for the TCP Authentication Option (TCP-AO)," (TCP-AO)", RFC 5926,
              DOI 10.17487/RFC5926, June 2010. 2010,
              <https://www.rfc-editor.org/info/rfc5926>.

   [RFC6978]  Touch, J., "A TCP Authentication Option Extension for NAT
             Traversal,"
              Traversal", RFC 6978, DOI 10.17487/RFC6978, July 2013. 2013,
              <https://www.rfc-editor.org/info/rfc6978>.

   [RFC7323]  Borman, D., B. Braden, V. B., Jacobson, V., and R.
              Scheffenegger, Ed., "TCP Extensions for High Performance," Performance",
              RFC 7323, Sept.
             2014. DOI 10.17487/RFC7323, September 2014,
              <https://www.rfc-editor.org/info/rfc7323>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words," Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017. 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8200]  Deering, S., S. and R. Hinden, "Internet Protocol Protocol, Version 6
              (IPv6) Specification," Specification", STD 86, RFC 8200, Jul. 2017.
              DOI 10.17487/RFC8200, July 2017,
              <https://www.rfc-editor.org/info/rfc8200>.

11.2.  Informative References

   [RFC2202]  Cheng, P., P. and R. Glenn, "Test Cases for HMAC-MD5 and
             HMAC-SHA-1," HMAC-
              SHA-1", RFC 2202, Sept. 1997. DOI 10.17487/RFC2202, September 1997,
              <https://www.rfc-editor.org/info/rfc2202>.

   [RFC4493]  Song, JH, R. JH., Poovendran, J. R., Lee, J., and T. Iwata, "The
              AES-CMAC
             Algorithm," Algorithm", RFC 4493, DOI 10.17487/RFC4493, June 2006.
              2006, <https://www.rfc-editor.org/info/rfc4493>.

   [RFC9187]  Touch, J., "Sequence Number Extension for Windowed
             Protocols,"
              Protocols", RFC 9187, Jan. 2022.

12. DOI 10.17487/RFC9187, January 2022,
              <https://www.rfc-editor.org/info/rfc9187>.

Acknowledgments

   This work benefited from feedback from Russ Housley and Michael
   Scharf as well as discussions on the IETF TCPM email list and with
   the IESG.

   This document was initially prepared using 2-Word-v2.0.template.dot.

Authors' Addresses

   Joe Touch
   Manhattan Beach, CA 90266 USA
   United States of America
   Phone: +1 (310) 560-0334
   Email: touch@strayalpha.com

   Juhamatti Kuusisaari
   Infinera Corporation
   Sinimaentie 6c
   FI-02630 Espoo, Espoo
   Finland
   Email: jkuusisaari@infinera.com