ACVP KAS KDF TwoStep Specification

Internet-Draft	ACVP KAS KDF TwoStep	August 2020
Hammett	Expires 11 February 2021	[Page]

Status of This Memo

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This Internet-Draft will expire on 11 February 2021.¶

Copyright Notice

This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document.¶

1. Acknowledgements

There are no acknowledgements.¶

2. Abstract

This document defines the JSON schema for testing KAS-KDF-TwoStep SP800-56Cr1 implementations with the ACVP specification.¶

3. Introduction

The Automated Crypto Validation Protocol (ACVP) defines a mechanism to automatically verify the cryptographic implementation of a software or hardware crypto module. The ACVP specification defines how a crypto module communicates with an ACVP server, including crypto capabilities negotiation, session management, authentication, vector processing and more. The ACVP specification does not define algorithm specific JSON constructs for performing the crypto validation. A series of ACVP sub-specifications define the constructs for testing individual crypto algorithms. Each sub-specification addresses a specific class of crypto algorithms. This sub-specification defines the JSON constructs for testing KAS-KDF-TwoStep SP800-56Cr1 implementations using ACVP.¶

4. Terms and definitions

No terms and definitions are listed in this document.¶

5. Supported KAS-KDF OneStep

The following key derivation functions MAY be advertised by the ACVP compliant cryptographic module:¶

KAS-KDF / TwoStep / SP800-56Cr1¶

6. Test Types and Test Coverage

The ACVP server performs a set of tests on the KDFs specific to the KAS protocol in order to assess the correctness and robustness of the implementation. A typical ACVP validation session SHALL require multiple tests to be performed for every supported permutation of KDF capabilities. This section describes the design of the tests used to validate implementations of KAS-KDF algorithms.¶

6.1. Test Types

There are two test types for KAS-KDF testing:¶

"AFT" - Algorithm Function Test. In the AFT test mode, the IUT SHALL act as a party in the Key Agreement with the ACVP server. The server SHALL generate and provide all necessary information for the IUT to perform a successful key agreement; both the server and IUT MAY act as party U/V.¶
"VAL" - Validation Test. In the VAL test mode, The ACVP server MUST generate a complete (from both party U and party V's perspectives) key agreement, and expects the IUT to be able to determine if that agreement is valid. Various types of errors MUST be introduced in varying portions of the key agreement process that the IUT MUST be able to detect and report on.¶

6.2. Test Coverage

The tests described in this document have the intention of ensuring an implementation is conformant to [SP800-56Cr1].¶

6.2.1. Requirements Covered

SP 800-56Cr1 - 5 Two-Step Key Derivation. All functionality described in the specification is covered by ACVP testing.¶

6.2.2. Requirements Not Covered

SP 800-56Ar3 / SP 800-56Br2 - ASN.1 encoding for the KDF is not currently supported.¶

7. Capabilities Registration

ACVP requires crypto modules to register their capabilities. This allows the crypto module to advertise support for specific algorithms, notifying the ACVP server which algorithms need test vectors generated for the validation process. This section describes the constructs for advertising support of KAS-KDF-TwoStep SP800-56Cr1 algorithms to the ACVP server.¶

The algorithm capabilities MUST be advertised as JSON objects within the 'algorithms' value of the ACVP registration message. The 'algorithms' value is an array, where each array element is an individual JSON object defined in this section. The 'algorithms' value is part of the 'capability_exchange' element of the ACVP JSON registration message. See the ACVP specification [ACVP] for more details on the registration message.¶

7.1. Prerequisites

Each algorithm implementation MAY rely on other cryptographic primitives. For example, RSA Signature algorithms depend on an underlying hash function. Each of these underlying algorithm primitives must be validated, either separately or as part of the same submission. ACVP provides a mechanism for specifying the required prerequisites:¶

Prerequisites, if applicable, MUST be submitted in the registration as the prereqVals JSON property array inside each element of the algorithms array. Each element in the prereqVals array MUST contain the following properties¶

Table 1: Prerequisite Properties
JSON Property	Description	JSON Type
algorithm	a prerequisite algorithm	string
valValue	algorithm validation number	string

A "valValue" of "same" SHALL be used to indicate that the prerequisite is being met by a different algorithm in the capability exchange in the same registration.¶

An example description of prerequisites within a single algorithm capability exchange looks like this¶

"prereqVals":
[
  {
    "algorithm": "Alg1",
    "valValue": "Val-1234"
  },
  {
    "algorithm": "Alg2",
    "valValue": "same"
  }
]

Figure 1

7.2. Property Registration

The KAS-KDF-TwoStep SP800-56Cr1 mode capabilities are advertised as JSON objects within a root "algorithm" object.¶

A registration SHALL use these properties:¶

Table 2: Registration Properties
JSON Value	Description	JSON Type	Valid Values
algorithm	The algorithm under test	value	KAS-KDF
mode	The mode under test	value	OneStep
revision	The algorithm testing revision to use.	value	"Sp800-56Cr1"
prereqVals	Prerequisite algorithm validations	array of prereqAlgVal objects	See Section 7.2.1
capabilities	The two step configuration objects	array of Section 7.2.2	See Section 7.2.2
	The domain of values representing the min/max lengths of Z the implementation can support.	Domain

7.2.1. Prerequisite Algorithms for KAS KDF Validations

Some algorithm implementations rely on other cryptographic primitives. For example, IKEv2 uses an underlying SHA algorithm. Each of these underlying algorithm primitives must be validated, either separately or as part of the same submission. ACVP provides a mechanism for specifying the required prerequisites:¶

Table 3: Prerequisite Algorithms
JSON Value	Description	JSON Type	Valid Values
algorithm	a prerequisite algorithm	value	CMAC, DRBG, HMAC, KMAC, SHA
valValue	algorithm validation number	value	actual number or "same"
prereqAlgVal	prerequisite algorithm validation	object with algorithm and valValue properties	see above

7.2.2. Two Step KDF Capabilities

Table 4: TwoStepCapabilities Options
JSON Value	Description	JSON Type	Valid Values
macSaltMethod	How the salt is determined (default being all 00s, random being a random salt).	array of string	default, randombased auxiliary functions.
fixedInfoPattern	The pattern used for fixedInfo construction.	string	See Section 7.2.3
encoding	The encoding type to use with fixedInfo construction. Note concatenation is currently supported. ASN.1 should be coming.	array of string	concatenation
kdfMode	The strategy for running the KDF.	string	counter, feedback, double pipeline iteration
macMode	The macMode supported by the KDF.	array of string	CMAC-AES128, CMAC-AES192, CMAC-AES256, HMAC-SHA-1, HMAC-SHA2-224, HMAC-SHA2-256, HMAC-SHA2-384, HMAC-SHA2-512, HMAC-SHA2-512/224, HMAC-SHA2-512/256, HMAC-SHA3-224, HMAC-SHA3-256, HMAC-SHA3-384, HMAC-SHA3-512
fixedDataOrder	The counter locations supported by the KDF.	array of string	none, before fixed data, after fixed data, before iterator
counterLength	The counter lengths supported for the KDF.	array of integer	8, 16, 24, 32
supportedLengths	The supported derivation lengths.	domain	Single range (of literal) expected. Registered value must support the L value provided.
supportsEmptyIv	The KDF supports an empty IV (feedback mode).	boolean	true, false
requiresEmptyIv	The KDF requires an empty IV (feedback mode).	boolean	true, false

Note this capabilities object is very similar to the capability object from SP800-108.¶

7.2.3. FixedInfoPatternConstruction

IUTs SHALL be capable of specifying how the FixedInfo is constructed for the KDF construction.¶

Pattern candidates:¶

literal[0123456789ABCDEF]¶
- uses the specified hex within "[]". literal[0123456789ABCDEF] substitutes "0123456789ABCDEF" in place of the field¶
uPartyInfo¶
- uPartyId { || ephemeralKey } { || ephemeralNonce } { || dkmNonce } { || c }¶
  - "optional" items such as ephemeralKey MUST be included when available for ACVP testing.¶
vPartyInfo¶
- vPartyId { || ephemeralKey } { || ephemeralNonce } { || dkmNonce } { || c }¶
  - "optional" items such as ephemeralKey MUST be included when available for ACVP testing.¶
context¶
- Random value chosen by ACVP server to represent the context.¶
algorithmId¶
- Random value chosen by ACVP server to represent the algorithmId.¶
label¶
- Random value chosen by ACVP server to represent the label.¶

Example (Note that party U is the server in this case "434156536964", party V is the IUT "a1b2c3d4e5"):¶

"concatenation" : "literal[123456789CAFECAFE]||uPartyInfo||vPartyInfo"¶

Evaluated as:¶

"123456789CAFECAFE434156536964a1b2c3d4e5"¶

7.3. Registration Example

{
  "algorithm": "KAS-KDF",
  "mode": "TwoStep",
  "revision": "Sp800-56Cr1",
  "prereqVals": [
    {
      "algorithm": "DRBG",
      "valValue": "123456"
    },
    {
      "algorithm": "SHA",
      "valValue": "123456"
    },
    {
      "algorithm": "HMAC",
      "valValue": "123456"
    }
  ],
  "capabilities": [
    {
      "macSaltMethods": [
        "random",
        "default"
      ],
      "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
      "encoding": [
        "concatenation"
      ],
      "kdfMode": "feedback",
      "macMode": [
        "HMAC-SHA3-224",
        "HMAC-SHA2-512"
      ],
      "supportedLengths": [
        512
      ],
      "fixedDataOrder": [
        "after fixed data",
        "before iterator"
      ],
      "counterLength": [
        32
      ],
      "requiresEmptyIv": false,
      "supportsEmptyIv": false
    }
  ],
  "l": 2048,
  "z": [
    512
  ]
}

Figure 2: Registration JSON Example

8. Test Vectors

The ACVP server provides test vectors to the ACVP client, which are then processed and returned to the ACVP server for validation. A typical ACVP validation test session would require multiple test vector sets to be downloaded and processed by the ACVP client. Each test vector set represents an individual algorithm defined during the capability exchange. This section describes the JSON schema for a test vector set used with KAS-KDF-TwoStep SP800-56Cr1 algorithms.¶

The test vector set JSON schema is a multi-level hierarchy that contains meta data for the entire vector set as well as individual test vectors to be processed by the ACVP client. The following table describes the JSON elements at the top level of the hierarchy.¶

Table 5: Top Level Test Vector JSON Elements
JSON Values	Description	JSON Type
acvVersion	Protocol version identifier	string
vsId	Unique numeric vector set identifier	integer
algorithm	Algorithm defined in the capability exchange	string
mode	Mode defined in the capability exchange	string
revision	Protocol test revision selected	string
testGroups	Array of test groups containing test data, see Section 8.1	array

An example of this would look like this¶

{
  "acvVersion": "version",
  "vsId": 1,
  "algorithm": "Alg1",
  "mode": "Mode1",
  "revision": "Revision1.0",
  "testGroups": [ ... ]
}

Figure 3

8.1. Test Groups JSON Schema

The testGroups element at the top level in the test vector JSON object is an array of test groups. Test vectors are grouped into similar test cases to reduce the amount of data transmitted in the vector set. For instance, all test vectors that use the same key size would be grouped together. The Test Group JSON object contains meta data that applies to all test vectors within the group. The following table describes the KAS-KDF-TwoStep SP800-56Cr1 JSON elements of the Test Group JSON object¶

Table 6: Test Group Properties
JSON Values	Description	JSON Type
tgId	Test group identifier	integer
testType	Describes the operation the client should perform on the tests data	string
tests	Array of individual test cases	See Section 8.2
kdfConfiguration	Describes the Kdf configuration values used for the group	See Section 8.1.1

The 'tgId', 'testType' and 'tests' objects MUST appear in every test group element communicated from the server to the client as a part of a prompt. Other properties are dependent on which 'testType' the group is addressing.¶

8.1.1. KDF Configuration JSON Schema

Describes the KDF configuration for use under the test group.¶

Table 7: KdfConfiguration JSON Object
JSON Value	Description	JSON Type
kdfType	The type of KDF to use for the group.	value - twostep
satMethod	The strategy used for salting.	value - default (all 00s), random
fixedInfoPattern	The pattern used for constructing the fixedInfo.	value - See Section 7.2.3.
fixedInfoEncoding	The pattern used for constructing the fixedInfo.	value - See Section 7.2.3.
macMode	The MAC function used in the KDF.	value
counterLocation	The counter location.	value
counterLen	The counter length.	value
ivLen	The iv length.	value

8.2. Test Case JSON Schema

Each test group contains an array of one or more test cases. Each test case is a JSON object that represents a single test vector to be processed by the ACVP client. The following table describes the JSON elements for each KAS/KTS ECC test vector.¶

Table 8: Test Case JSON Object
JSON Value	Description	JSON Type
tcId	Numeric identifier for the test case, unique across the entire vector set.	kdfParameter
Object representing inputs into the KDF	See Section 8.2.1.	fixedInfoPartyU
Fixed information specific to party U	See Section 8.2.2.	fixedInfoPartyV

8.2.1. KDF Parameter JSON Schema

KDF specific options used for the test case.¶

Table 9: KDF Parameter JSON Object
JSON Value	Description	JSON Type
kdfType	The type of KDF utilized.	value
salt	The salt used for the test case.	value
iv	The iv used for the test case.	value
algorithmId	The random "algorithID" used for the test case when applicable to the fixedInfo pattern.	value
context	The random "context" used for the test case when applicable to the fixedInfo pattern.	value
label	The random "label" used for the test case when applicable to the fixedInfo pattern.	value
z	shared secret z value to be used for the test case.	value

8.2.2. FixedInfo PartyU/V JSON Schema

Fixed information that is included for party U/V for fixed info construction¶

Table 10: Fixed Info JSON Object
JSON Value	Description	JSON Type
partyId	The party identifier	value
ephemeralData	Ephemeral data (randomly) included as a part of the parties fixed info construction	value

8.3. Example Test Vectors JSON

The following is a example JSON object for KAS-FFC test vectors sent from the ACVP server to the crypto module.¶

{
  "vsId": 0,
  "algorithm": "KAS-KDF",
  "mode": "TwoStep",
  "revision": "Sp800-56Cr1",
  "isSample": true,
  "testGroups": [
    {
      "tgId": 1,
      "testType": "AFT",
      "tests": [
        {
          "tcId": 1,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "0ADFBF33C04265B205163B6CDE97BB1B29FE1821B56E7022A74E4054ADC52AC3F339219C6B4C9B158EE95ED440AB1769FFFC33220B28F62C7B2A805B57F39C63",
            "z": "576F1B40A4A640C72DD070C5D80380558D1A642DEEAA8F1978428ADE63D7DA4553780E25103F97E493F2626AB9F67CAA626A1F461BD08266942B7F3C8BD3BA90",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "3A29BC54ADE2C0AD617FFD70112445F87E15B21D67156E10CCBC07D0ECF8649163738EFEEFFAC01488875B8AE14F229CFC6C34EF641D04C928AB4F6DF74834BC",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "806604B8DA9F7E391F8307486CD67D0A"
          },
          "fixedInfoPartyV": {
            "partyId": "20FE389DE49E9CA909D48E9F0BA5BAB2",
            "ephemeralData": "02A918E3A64B8BC17907569DAA75BEC4DA331303460127A86C6CCEF2B62164BAA1459C3AE46A9E6302EE6A4BCA608E2726DAC275F6D1479EE4FC4E45AE8DAFE3"
          }
        },
        {
          "tcId": 2,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "BE4FEA6C28C7F6D571B0EC89CAB2E586053CDE9208CA409D164F03FD58938CFB47E63C3BE589DD512A6F659ECD60AD9EA784213DD81F7AFB8BCFF506192044D6",
            "z": "025E3E3EF6B67354DE9778F793214A7A9CC8C0DD87DA70E27F7C47E63F9E33B89AB20AB6339FFBD8F827C19FE7AA144B89537EB0731A030D1571DEF28E6C7CA0",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "375FA1A86CD4CD1A7833F88BE886545D6ED652BC3F6B173B5A768B01BA740BF1B3AA263B078321DC0FBD1B8A565E84A17398669A5D2F4A5E9AA92B8EB0DCD894",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "181AA0E72E042B9803A213DF7CBB8051",
            "ephemeralData": "C933CCD623CBC35246E713BD690F1C5FEA12722F281EE07BDE3219F2843BC29E58B4F76873CCFB1DA866BC4C045C36D711A440859073EAC09C40A21EE96CB903"
          },
          "fixedInfoPartyV": {
            "partyId": "AA783D9D6B897E04BE1F2004C3F21A35",
            "ephemeralData": "4B5F015CE5974ED4FB992A634A47BEDA77F470EFEE10E7667FEAE1E7B8F53A204B15A97B893E6551FD3FE64F8014F255ADAE070F4E2F31F4DB8B9A4BE84B13E1"
          }
        },
        {
          "tcId": 3,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "3040A6C24E8CDA5E53DDF7C42335FA82383FC3B1F2C95E3D335D9720BD3AB251DF07712EF3824ECDB00C7267B30552225FE5B5889765A2A16F9A459D5A8A6BC5",
            "z": "653DFF10216BDC7C6817F78FAE59FF15400061951EEB9AF309819AE7A2904829C29127688FC1A1A40F62F9CE886A1A3B01D729B59278168DA58ED2C210ECDE61",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "E680F9C99500ED6AB6F40D35783F81DC44AAD381F12EAABB5ABD697C2C57981D97710E0A465EE6D5591BE43C33714A0F0AFE1AA90976D2F48A3F277BD546859A",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "427A430E34956099A11A34996C68B585",
            "ephemeralData": "CE4FCE03CD168399D90D499BA988D7A16738730F0E713B3783A297D3858F7F28623959E2622F15B7E5E0A793F9DF99855CF3F9602E0A2628313132E2CE697980"
          },
          "fixedInfoPartyV": {
            "partyId": "44D5D13558C15CF6EE886E69E005A8EC"
          }
        },
        {
          "tcId": 4,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "F9916CA1F2B351D833AD84391A48DC3753D21E156C32F961F26897376A3ED5AB18689B99B3CF1BFE55EDF56AA1ADEFEF5022395346B1D9942B20710DB2A6C629",
            "z": "BAF85001AAF675464043635BEC546B935A6542DCF401B3744ED1E633F912827A925869FD0DC1DA9392042ACD10D53A9BEBE260BB63F8FC23F55EC38589084A6B",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "10743126EF5675BA21A5D4F025A8D21157703C447D93EFC47F5853827CFC3967F55076E3E6910B2726DE4E53BC7C7C49E03F81C3703FBB875818B8FA7E9B9970",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "50B610281A9C8768B5B7E84E39E866A4"
          },
          "fixedInfoPartyV": {
            "partyId": "BB234C26EFBEB3D13F17366B14917967",
            "ephemeralData": "42D9BB758F33884617A1554CB1F149FE7CB9164F62E775DDCF5B48F640C0E15E783A41C5F9357CF9D12F38A566D69A35A5BF361728C7D4849FB4AA0B2C5A764F"
          }
        },
        {
          "tcId": 5,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "956E5333A9A29004CB4C3CAC3750FACCB46106900B7E7CDA166D6DCB7BE8A2679F195203C4DDD8E34EF6E90D52E39465A15E2C42CDC537E87218118186DEFAB4",
            "z": "6F3EDA174C2DD8C611D126300C6AB0D61D6AEB804D527C87801BDE3AD3F6AD2C8B7E4976633AB154A92AD79105695EBC996514D1A8E40EB8B53D51FD8181F1E9",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "632C996B274A3C313C93645B0B32C5D21960BCC4DF105924E970C19F6BEDE80E86E3C4CA3B771D552AF3E10109F82876DDBDEA6A9077CC27F7D5E244A066251E",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "6929DD85147EE842DE5F921E247B598F"
          },
          "fixedInfoPartyV": {
            "partyId": "3DAC69CEB1620DE4DB065A71DEC68C1C",
            "ephemeralData": "555F54BEC5FCF9269F53C55E6EC8EEB324581E5D12A75274481D01FA0320A1D6D17E742CFD85394975FF1E90784EFA06C3AEE88CBCA848C98C5144FF456F26BD"
          }
        }
      ],
      "kdfConfiguration": {
        "kdfType": "twoStep",
        "l": 512,
        "saltLen": 512,
        "saltMethod": "random",
        "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
        "fixedInfoEncoding": "concatenation",
        "kdfMode": "feedback",
        "macMode": "HMAC-SHA2-512",
        "counterLocation": "after fixed data",
        "counterLen": 32,
        "ivLen": 512
      }
    },
    {
      "tgId": 33,
      "testType": "VAL",
      "tests": [
        {
          "tcId": 161,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "A12858E5715B0A82E684B2D4433768BD56FD2FB701AB7367B0095DEBB1511FB467AEDBE9E70DFEBC4E5375574B8597717CB2D8CB6D560A7D1240F36F1758D65C",
            "z": "366F5863F9B2F6F56FCEDD44D1CF1585C83D7CFBC146C0B8A5835D05F9F4BF1225ECB140BD6BB30CA3DF9B27336CFF4DFB3293B480AB6CE8B016CEACBF9AD50A",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "F611B1D01C10B85CF2FDA62E2E70CE73301D9FCEFFB523D6BDCE5176C8A50A4A0ECA9702E02F6A9B01926AA4812AB7018C9652C9E4E4D58E13910087ACB9EF5C",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "8FA71E55677BC77BEFF5399FF56E8580"
          },
          "fixedInfoPartyV": {
            "partyId": "505F428AAB0F0385F035E11AE22A38A2",
            "ephemeralData": "649B3A141042D4D2DBBB0A40820688C02B6C8AD363C50209ED792E8131DC45171B85F144E636190539A46553451FC083234ED71966617D55E0204B29470E7641"
          },
          "dkm": "ABD671702D3E4F6040DD4EF8CE7F93C048071AA2A4857E9D90DF14EADA758E5CCB702A14039EA0BDE758F688097661FEFC2FB71350CB4205C74F0326807C7E3B"
        },
        {
          "tcId": 162,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "45A57043BECD4048EE868278CF78907DB3C3D6B2740E4C36FFD6CE98775D7966AA80DB17ACFD9DD2D47B85736E43E10F0724A9672BD57321BC1C405C9F14C473",
            "z": "E8257C5D497449D2BA04D3FB79A0BD15FAA76511DD726E80211A8EC6830EBB64CAAEA785704C3AC68FCE36A1BBF738A06D2530E7B6F5758FABECAA833AD8A1F1",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "F33F177DDBFAE1F942E21D41FAE4D01E4177604A34C43721D068D6108781C9A7C5BC1701572E6FF3E331B163872E49D9FC2106762638440B406FAC4BEDC52AF3",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "2ED2A1A8514BB3302CB0C0501C325C0B"
          },
          "fixedInfoPartyV": {
            "partyId": "BA287A7504EDEAE60FE82BC1A974E793",
            "ephemeralData": "A68EF3B1402B3A2A8E1C075302196DCB9DC99F240061F2BD5FE8B1AA77C9E2962239BA28C3D66A0D4A3049A9B2D5775C97214C1D6FC42A60B6B687AA38845BD8"
          },
          "dkm": "E24017258025637EB0175E0916B5C8152AE22185269096B7AD03A21EFB3DFB8AF863A2D574F5F8C91B5B7E59A51F534AB2F93A8FEF15F37A9CDF1B4BBF6DEBAC"
        },
        {
          "tcId": 163,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "4F08A21287BA7AD996B25B9BEED8D734A09E2A958050B6FCE024C6F302B4652C129834785ADF840B9A6BF83E83C8937AB8342FA059E29E8480FCF10BC515448F",
            "z": "4FA641D15099935020D57449CF2DFE5D9430BCD85BBB1EF4367F474FA699AD7CC6FAC9DCA26D1F0D46DCF9FC3302392F88FDC42A378E211882E33E6FA6DA2D1A",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "D1A84B095C875B585BF3677DD4A0D875EFEE2AD3B37F2412032563FDC57A00AD5ACD9D0B78281EB3D177AA5CA1253EE6E104EAA78787E76FB4C4317A3A2CCF05",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "516D813DDD3ECBBAE738572A7DBBC827",
            "ephemeralData": "95E1D0001556173E6F3C505D4DD0658B668B397C01B2A4B44AFCB3C9FCF8604826CFE3F7367D1445C50669B30010346C78B3652FAEBB5578D8077D2A9BDD44D8"
          },
          "fixedInfoPartyV": {
            "partyId": "0C4804B70E4CC537B9AFB66CCE659586",
            "ephemeralData": "D2F7F4316DFADBD61CCD3761899A4B697B515CFDF8E2AA6DCC03834F25EA8C4ACE39B72D03971517B6D4FABCD4E77B1CC3E34AE65CB1BD8924F8C9821291AA16"
          },
          "dkm": "48B0E4139CAF7818490A0FED0AA83509B1E665EA84D6748CC7E03FFB7B4F693D71B9A2B4DAA43F4D9DBA957B437282B9E92325DEBDDD52DEFBD9D2E29594839D"
        },
        {
          "tcId": 164,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "0FA2DB567054A3FD5B4C80F7BC3EB7FDFFEB2DE24A7E15B9825AAC7965CEF61A725D5EA530C7F9239EED953D2086E36FDEE9953A361BB06E470B1D697741EAF1",
            "z": "AD5B5575642BF653381470A00D261602A5444C19EFFDFB7965AE9A70911C9611C35DE20B8F0C467EBE359E88F9EE0E2E847F886CA39BB89067E482ABA9B488D7",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "9D6A8E1B559B812DB1F0B4A88D625EE75943241AF3347C527937A61139F76E73DE2CEA58D66872A9997BA01FED32C80DF5BBA31727660388C26584C7441BA852",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "31A445A08D8089609314ED6CD691D75B",
            "ephemeralData": "4BF9B00CA328F2792D937663B051ED5B9916249AAF8854F0B40AF266C70E63F9510D9787F016AC920214396EBB41944F9F24EF496F793EE381A02350BBF48D67"
          },
          "fixedInfoPartyV": {
            "partyId": "6E6764B019CA8D8A5D395DE0E6752830",
            "ephemeralData": "6357D8183753E697C365BFF5E672BF8AE52394C50FFF15F23AD3045F1A900DBA8B147D79ABD526F3B4FEB930AE727E3D5A40A766C9734DE0D083EE5D469A957C"
          },
          "dkm": "647A0008C671EE83B17A32887ABA2DFD190C33AAE20537599A048171A8B6B760F6674E18E5E465F0104CFBB1DBDB1CADCAE9EA57CCF29241D62D558DFDD8F826"
        },
        {
          "tcId": 165,
          "kdfParameter": {
            "kdfType": "twoStep",
            "requiresAdditionalNoncePair": false,
            "salt": "DF6847F01DF268B26A95870776389BE7E74F3E0E58E4EBB169CF9C6CF0B3071096CA8722FCD33BF455C4ADAC94A44A1E95ACB7E3851A0B668A44C359E6BD7617",
            "z": "E16F10272E509C404C4669428313CE083196F8CD49FAB74E64EFDD972D0933DE4DAF2809DD952873A13775816EE2F8A79CE3C3579813E80979EDBC56C43D77C2",
            "l": 512,
            "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
            "fixedInputEncoding": "concatenation",
            "iv": "C8D7247CBB6AEBF5EE90E13203303B2145A1D5A5CBFBB6722CE373C98A1604836A79B2AA043E4871898E534E8615ECECB6466CC9C0E23B7A8228BB03DB748441",
            "kdfMode": "feedback",
            "macMode": "HMAC-SHA2-512",
            "counterLocation": "after fixed data",
            "counterLen": 32
          },
          "fixedInfoPartyU": {
            "partyId": "7AD3ED7BC9207D09C904B6B924B9C639",
            "ephemeralData": "EA712C47B0CA7183EB1F3BCBDD6282E240473D09C9FD3644BA0DCD343AC49CD6C852D17C48C47A4AC95178723F071018473E3DC18CFBECBCED750B2B143AD563"
          },
          "fixedInfoPartyV": {
            "partyId": "0CC0877A3BFB4C024B12037825B6339A",
            "ephemeralData": "68995A7D9A588A87BC1184EA586876E3D9A5484F4C9FA81B36247B77C6C37DBDB1FB70E3407FDA166FDFC72287D62F12C517735D03C3B7D97D9AFC756FFA6683"
          },
          "dkm": "0A3A1C08B55A60DA29E84FB82A54FA386008B07F74F192E179E99ED509E6AEB6580BA7B6E8D3DAC7E0E0A93D1F25F8F9F95297CA65F36D44A38C586EB7CF9F0C"
        }
      ],
      "kdfConfiguration": {
        "kdfType": "twoStep",
        "l": 512,
        "saltLen": 512,
        "saltMethod": "random",
        "fixedInfoPattern": "uPartyInfo||vPartyInfo||l",
        "fixedInfoEncoding": "concatenation",
        "kdfMode": "feedback",
        "macMode": "HMAC-SHA2-512",
        "counterLocation": "after fixed data",
        "counterLen": 32,
        "ivLen": 512
      }
    }
  ]
}

Figure 4: Vector Set JSON Example

9. Test Vector Responses

After the ACVP client downloads and processes a vector set, it MUST send the response vectors back to the ACVP server. The following table describes the JSON object that represents a vector set response.¶

Table 11: Vector Set Response Properties
JSON Property	Description	JSON Type
acvVersion	The version of the protocol	string
vsId	The vector set identifier	integer
testGroups	The test group data	array

The testGroups section is used to organize the ACVP client response in a similar manner to how it receives vectors. Several algorithms SHALL require the client to send back group level properties in their response. This structure helps accommodate that.¶

Table 12: Test Group Response Properties
JSON Property	Description	JSON Type
tgId	The test group identifier	integer
tests	The test case data	array

The testCase section is used to organize the ACVP client response in a similar manner to how it receives vectors. Several algorithms SHALL require the client to send back group level properties in their response. This structure helps accommodate that.¶

The following table describes the JSON object that represents a test case response for a KAS-KDF-TwoStep SP800-56Cr1.¶

Table 13: Test Case Response Properties
JSON Property	Description	JSON Type
tcId	The test case identifier	integer
testPassed	Was the provided `dkm` valid? Only valid for the "VAL" test type.	boolean
dkm	The derived keying material. Provided by the IUT for "AFT" test type test cases.	hex

Here is an abbreviated example of the response¶

9.1. Example Test Vectors Response JSON

{
  "vsId": 0,
  "algorithm": "KAS-KDF",
  "mode": "TwoStep",
  "revision": "Sp800-56Cr1",
  "isSample": true,
  "testGroups": [
    {
      "tgId": 1,
      "tests": [
        {
          "tcId": 1,
          "dkm": "F30FA60BE892E9506BB1D7F0F69130A1F9142083E7EA64076D1ECDF5103571858FB742F94D96015EE0C747F3AB719A4EE00582064D58C111737BE2E7EEB53CC0"
        },
        {
          "tcId": 2,
          "dkm": "F6BF05D035D95C05B694DADE4DA41D05DC83E6CA100BFB1F13E24639C7DE5AE6B1ED0FECC1860F2246FF62624B805BFE3F15C3BD0639E13FBD69215FC75D066F"
        },
        {
          "tcId": 3,
          "dkm": "D7DC1B2E454D66529F82999006D67B2595D3862C81DB318B75DC005C888F294A652FBC35336CC5BD4510CE9CD38B7216596BAA65D6652D70A127D85767DB3818"
        },
        {
          "tcId": 4,
          "dkm": "677D6B89F0E747EBA608180A711D5964EAAC73690F72365E871D98AD0440DC6645312773651981B0A9C483D01A8783F52A443650ADE9E7924AAA57D8B9AB9111"
        },
        {
          "tcId": 5,
          "dkm": "875FADC0885DB1B0F0D2C38A27CC1169C4F5F4474F539A302169A99EA00689C587CE6B9873CFE681DAC6B02B91D6E47A8B1C53C3A45DAC54B06CC242FCCD5351"
        }
      ]
    },
    {
      "tgId": 33,
      "tests": [
        {
          "tcId": 161,
          "testPassed": true
        },
        {
          "tcId": 162,
          "testPassed": false
        },
        {
          "tcId": 163,
          "testPassed": true
        },
        {
          "tcId": 164,
          "testPassed": true
        },
        {
          "tcId": 165,
          "testPassed": true
        }
      ]
    }
  ]
}

Figure 5: Example Response JSON

[RFC2119]: Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", IETF RFC 2119, IETF RFC 2119, DOI 10.17487/RFC2119, March 1997, <https://www.rfc-editor.org/info/rfc2119>.
[RFC7991]: Hoffman, P., "The "xml2rfc" Version 3 Vocabulary", IETF RFC 7991, IETF RFC 7991, DOI 10.17487/RFC7991, December 2016, <https://www.rfc-editor.org/info/rfc7991>.
[RFC8174]: Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", IETF RFC 8174, IETF RFC 8174, DOI 10.17487/RFC8174, May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[ACVP]: Hammett, R., "Automatic Cryptographic Validation Protocol", 2020.
[SP800-108]: Chen, L., "SP800-108 Recommendation for Key Derivation Using Pseudorandom Functions", 2009, <https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-108.pdf>.
[SP800-56Ar3]: Barker, E., Chen, L., Roginsky, A., Vassilev, A., and R. Davis, "SP800-56Ar3 Recommendation for Pair-Wise Key-Establishment Schemes Using Discrete Logarithm Cryptography", 2018, <https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Ar3.pdf>.
[SP800-56Cr1]: Barker, E., Chen, L., and R. Davis, "SP800-56Cr1 Recommendation for Key-Derivation Methods in Key-Establishment Schemes", 2018, <https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Cr1.pdf>.

Author's Address

Russell Hammett (editor)

Email: russell.hammett@nist.gov