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TBD B. Fussell, Ed.
Internet-Draft Cisco Systems, Inc.
Intended status: Informational August 1, 2018
Expires: February 2, 2019
ACVP SSH Key Derivation Function Algorithm JSON Specification
draft-ietf-acvp-subkdf135-ssh-1.0
Abstract
This document defines the JSON schema for using SP800-135 SSH KDF
algorithms with the ACVP specification.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on February 2, 2019.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
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. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Fussell Expires February 2, 2019 [Page 1]
Internet-Draft Sym Alg JSON August 2018
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 2
2. Capabilities Registration . . . . . . . . . . . . . . . . . . 2
2.1. Required Prerequisite Algorithms for KDF135 SSH
Validations . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. KDF135 SSH Algorithm Capabilities JSON Values . . . . . . 4
3. Test Vectors . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Test Groups JSON Schema . . . . . . . . . . . . . . . . . 5
3.2. Test Case JSON Schema . . . . . . . . . . . . . . . . . . 6
4. Test Vector Responses . . . . . . . . . . . . . . . . . . . . 7
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
7. Security Considerations . . . . . . . . . . . . . . . . . . . 8
8. Normative References . . . . . . . . . . . . . . . . . . . . 8
Appendix A. Example SP800-135 SSH KDF Capabilities JSON Object . 9
Appendix B. Example Test Vectors JSON Object . . . . . . . . . . 9
Appendix C. Example Test Results JSON Object . . . . . . . . . . 10
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 11
1. 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 SP800-135
SSH KDF algorithms using ACVP.
1.1. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted in RFC 2119 [RFC2119].
2. 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
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the constructs for advertising support of SP800-135 SSH KDF
algorithms to the ACVP server.
The algorithm capabilities are 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 for details on the
registration message. Each KDF algorithm capability advertised is a
self-contained JSON object.
2.1. Required Prerequisite Algorithms for KDF135 SSH Validations
Some KDF135 algorithm implementations rely on other cryptographic
primitives. For example, SSH 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:
+--------------+--------------+---------------+----------+----------+
| JSON Value | Description | JSON type | Valid | Optional |
| | | | Values | |
+--------------+--------------+---------------+----------+----------+
| algorithm | a | value | SHA, | No |
| | prerequisite | | AES, | |
| | algorithm | | TDES | |
| | | | | |
| valValue | algorithm | value | actual | No |
| | validation | | number | |
| | number | | or | |
| | | | "same" | |
| | | | | |
| prereqAlgVal | prerequistie | object with | see | No |
| | algorithm | algorithm and | above | |
| | validation | valValue | | |
| | | properties | | |
| | | | | |
| prereqVals | prerequistie | array of | see | No |
| | algorithm | prereqAlgVal | above | |
| | validations | objects | | |
+--------------+--------------+---------------+----------+----------+
Table 1: Required Prerequisite Algorithms JSON Values
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2.2. KDF135 SSH Algorithm Capabilities JSON Values
Each algorithm capability advertised is a self-contained JSON object
using the following values.
+----------+-------------+-------------+-----------------+----------+
| JSON | Description | JSON type | Valid Values | Optional |
| Value | | | | |
+----------+-------------+-------------+-----------------+----------+
| algorith | The KDF to | value | "kdf- | No |
| m | be | | components" | |
| | validated | | | |
| | | | | |
| mode | The KDF- | value | "ssh" | No |
| | Component | | | |
| | to be | | | |
| | validated | | | |
| | | | | |
| revision | The | value | "1.0" | No |
| | algorithm | | | |
| | testing | | | |
| | revision to | | | |
| | use. | | | |
| | | | | |
| prereqVa | Prerequisit | array of pr | See Section 2.1 | No |
| ls | e algorithm | ereqAlgVal | | |
| | validations | objects | | |
| | | | | |
| cipher | Block | array | TDES, AES-128, | No |
| | ciphers | | AES-192, | |
| | supported | | AES-256 | |
| | | | | |
| hashAlg | SHA | array | SHA-1, | No |
| | functions | | SHA2-224, | |
| | supported | | SHA2-256, | |
| | | | SHA2-384, | |
| | | | SHA2-512 | |
+----------+-------------+-------------+-----------------+----------+
Table 2: SP800-135 SSH KDF Algorithm Capabilities JSON Values
Note: Some optional values are required depending on the algorithm.
Failure to provide these values will result in the ACVP server
returning an error to the ACVP client during registration.
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3. 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 session would require multiple test vector
sets to be downloaded and processed by the ACVP client. Each test
vector set represents an individual Key Derivation Function (KDF),
such as SNMP, SSH, etc. This section describes the JSON schema for a
test vector set used with SP800-135 SSH KDF 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.
+------------+---------------------------------------------+--------+
| JSON Value | Description | JSON |
| | | type |
+------------+---------------------------------------------+--------+
| acvVersion | Protocol version identifier | value |
| | | |
| vsId | Unique numeric identifier for the vector | value |
| | set | |
| | | |
| algorithm | "kdf-components" | value |
| | | |
| mode | "ssh" | value |
| | | |
| revision | "1.0" | value |
| | | |
| testGroups | Array of test group JSON objects, which are | array |
| | defined in Section 3.1 | |
+------------+---------------------------------------------+--------+
Table 3: Vector Set JSON Object
3.1. 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 secure hash JSON elements of the Test
Group JSON object.
The KDF test group for SSH is as follows:
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+---------+--------------------------------------+-------+----------+
| JSON | Description | JSON | Optional |
| Value | | type | |
+---------+--------------------------------------+-------+----------+
| tgId | Numeric identifier for the test | value | No |
| | group, unique across the entire | | |
| | vector set. | | |
| | | | |
| hashAlg | The SHA type used for the test | value | No |
| | vectors | | |
| | | | |
| cipher | The encryption method used | value | No |
| | | | |
| tests | Array of individual test vector JSON | array | No |
| | objects, which are defined in | | |
| | Section 3.2 | | |
| | | | |
+---------+--------------------------------------+-------+----------+
Table 4: Vector Group JSON Object
3.2. 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 SP800-135 SSH KDF test vector.
+-----------+------------------------------------+-------+----------+
| JSON | Description | JSON | Optional |
| Value | | type | |
+-----------+------------------------------------+-------+----------+
| tcId | Numeric identifier for the test | value | No |
| | case, unique across the entire | | |
| | vector set. | | |
| | | | |
| k | Shared secret value in MPINT | value | No |
| | format (see RFC4251) | | |
| | | | |
| h | Hash value | value | No |
| | | | |
| sessionId | Session ID value | value | No |
+-----------+------------------------------------+-------+----------+
Table 5: Test Case JSON Object
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4. 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.
+------------+---------------------------------------------+--------+
| JSON Value | Description | JSON |
| | | type |
+------------+---------------------------------------------+--------+
| acvVersion | Protocol version identifier | value |
| | | |
| vsId | Unique numeric identifier for the vector | value |
| | set | |
| | | |
| testGroups | Array of JSON objects that represent each | array |
| | test vector group. See | |
| | Table 7 | |
| | | |
+------------+---------------------------------------------+--------+
Table 6: Vector Set Response JSON Object
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.
+-----------+--------------------------------------------+----------+
| JSON | Description | JSON |
| Value | | type |
+-----------+--------------------------------------------+----------+
| tgId | The test group Id | value |
| | | |
| tests | The tests associated to the group | value |
| | specified in tgId | |
| | | |
+-----------+--------------------------------------------+----------+
Table 7: Vector Set Group Response JSON Object
The following table describes the JSON object that represents a
vector set response for SSH.
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+---------------------+-------------------------------------+-------+
| JSON Value | Description | JSON |
| | | type |
+---------------------+-------------------------------------+-------+
| tcId | Numeric identifier for the test | value |
| | case, unique across the entire | |
| | vector set. | |
| | | |
| initialIvClient | Client to server initial IV | value |
| | | |
| initialIvServer | Server to client initial IV | value |
| | | |
| encryptionKeyClient | Client to server encryption key | value |
| | | |
| encryptionKeyServer | Server to client eencryption key | value |
| | | |
| integrityKeyClient | Client to server integrity key | value |
| | | |
| integrityKeyServer | Server to client integrity key | value |
| | | |
+---------------------+-------------------------------------+-------+
Table 8: Vector Set Response JSON Object
5. Acknowledgements
TBD...
6. IANA Considerations
This memo includes no request to IANA.
7. Security Considerations
Security considerations are addressed by the ACVP specification.
8. Normative References
[ACVP] authSurName, authInitials., "ACVP Specification", 2016.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
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Appendix A. Example SP800-135 SSH KDF Capabilities JSON Object
The following is a example JSON object advertising support for SHA-
256.
{
"algorithm": "kdf-components",
"mode": "ssh",
"revision": "1.0",
"prereqVals": [
{
"algorithm":"TDES",
"valValue":"111111"
},
{
"algorithm":"AES",
"valValue":"222222"
},
{
"algorithm": "SHA",
"valValue": "123456"
}
],
"hashAlg": [
"SHA-1",
"SHA2-224",
"SHA2-256",
"SHA2-384",
"SHA2-512"
],
"cipher": [
"TDES",
"AES-128",
"AES-192",
"AES-256"
]
}
Appendix B. Example Test Vectors JSON Object
The following is a example JSON object for SP800-135 SSH KDF test
vectors sent from the ACVP server to the crypto module.
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[
{
"acvVersion": <acvp-version>
},
{
"vsId": 1564,
"algorithm": "kdf-components",
"mode": "ssh",
"revision": "1.0",
"testGroups": [
{
"tgId": 1,
"cipher": "TDES",
"hashAlg": "SHA-1",
"tests": [
{
"tcId": 1,
"k": "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",
"h": "44A4FFE335663340FE1EA25BA61394AE311C69ED",
"sessionId": "76B6014593634CC835DB3F9AFCAE436D7AA2DBA4"
}
]
}
]
}
]
Appendix C. Example Test Results JSON Object
The following is a example JSON object for SP800-135 SSH KDF test
results sent from the crypto module to the ACVP server.
Fussell Expires February 2, 2019 [Page 10]
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[{
"acvVersion": <acvp-version>
},
{
"vsId": 1564,
"testResults": [{
"tgId": 1,
"tests": [{
"tcId": 1,
"initialIvClient": "D58275F599E68471",
"encryptionKeyClient": "D1B16D92ED9AB429546C53A3798998794E323188F094264B",
"integrityKeyClient": "E7F57D7BFFFB588164FAD8E8721478D275789B37",
"initialIvServer": "3F48A283BF85F147",
"encryptionKeyServer": "289241764AB45E7E70F90C779F24533B9D33CD6401962F57",
"integrityKeyServer": "9EE185ACDFE19221B796F2A698C82454B5E2A8C0"
}]
}]
}
]
Author's Address
Barry Fussell (editor)
Cisco Systems, Inc.
170 West Tasman Dr.
San Jose, CA 95134
USA
Email: [email protected]
Fussell Expires February 2, 2019 [Page 11]