Network Working Group C. Celi, Ed. Internet-Draft 10 August 2020 Intended status: Informational Expires: 11 February 2021 ACVP Secure Hash Algorithm (SHA) JSON Specification draft-ietf-acvp-sub-sha-01 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 11 February 2021. Copyright Notice Copyright (c) 2020 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. Table of Contents 1. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 2 2. Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 4. Terms and definitions . . . . . . . . . . . . . . . . . . . . 2 5. Supported Hash Algorithms . . . . . . . . . . . . . . . . . . 3 6. Test Types and Test Coverage . . . . . . . . . . . . . . . . 3 6.1. Test Types . . . . . . . . . . . . . . . . . . . . . . . 3 6.2. Monte Carlo tests for SHA-1 and SHA-2 . . . . . . . . . . 4 6.3. Test Coverage . . . . . . . . . . . . . . . . . . . . . . 4 Celi Expires 11 February 2021 [Page 1] Internet-Draft ACVP SHA August 2020 6.3.1. SHA Requirements Covered . . . . . . . . . . . . . . 4 6.3.2. SHA Requirements Not Covered . . . . . . . . . . . . 4 7. Capabilities Registration . . . . . . . . . . . . . . . . . . 5 7.1. Prerequisites . . . . . . . . . . . . . . . . . . . . . . 5 7.2. HASH Algorithm Capabilities Registration . . . . . . . . 6 8. Test Vectors . . . . . . . . . . . . . . . . . . . . . . . . 6 8.1. Test Groups . . . . . . . . . . . . . . . . . . . . . . . 8 8.2. Test Case . . . . . . . . . . . . . . . . . . . . . . . . 8 8.3. Test Vector Responses . . . . . . . . . . . . . . . . . . 9 9. Security Considerations . . . . . . . . . . . . . . . . . . . 10 10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 11. Example Secure Hash Capabilities JSON Object . . . . . . . . 11 12. Example Test Vectors JSON Object . . . . . . . . . . . . . . 11 13. Example Test Results JSON Object . . . . . . . . . . . . . . 13 14. Normative references . . . . . . . . . . . . . . . . . . . . 13 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 14 1. Acknowledgements There are no acknowledgements. 2. Abstract This document defines the JSON schema for testing Secure Hash Algorithm (SHA) 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 Secure Hash Algorithm (SHA) implementations using ACVP. 4. Terms and definitions No terms and definitions are listed in this document. Celi Expires 11 February 2021 [Page 2] Internet-Draft ACVP SHA August 2020 5. Supported Hash Algorithms The following hash algorithms MAY be advertised by the ACVP compliant cryptographic module: * SHA-1 * SHA2-224 * SHA2-256 * SHA2-384 * SHA2-512 * SHA2-512/224 * SHA2-512/256 6. Test Types and Test Coverage This section describes the design of the tests used to validate implementations of SHA-1 and SHA-2. 6.1. Test Types There are two types of tests for SHA-1 and SHA-2: functional tests and Monte Carlo tests. Each has a specific value to be used in the testType field. The testType field definitions are: * "AFT" - Algorithm Functional Test. These tests can be processed by the client using a normal 'hash' operation. AFTs cause the implementation under test to exercise nomral operations on a single block, multiple blocks, or partial blocks. In all cases,random data is used. The functional tests are designed to verify that the logical components of the hash function (block chunking, block padding etc.) are operating correctly. * "MCT" - Monte Carlo Test. These tests exercise the implementation under test under stenuous circumstances. The implementation under test must process the test vectors according to the correct algorithm and mode in this document. MCTs can help detect potential memory leaks over time, and problems in allocation of resources, addressing variables, error handling, and generally improper behavior in response to random inputs. Each MCT processes 100 pseudorandom tests. Each algorithm and mode SHOULD have at least one MCT group. See Section 6.2 for implementation details. Celi Expires 11 February 2021 [Page 3] Internet-Draft ACVP SHA August 2020 6.2. Monte Carlo tests for SHA-1 and SHA-2 The MCTs start with an initial condition (SEED which is a single message) and perform a series of chained computations. The algorithm is shown in Figure 1. For j = 0 to 99 MD[0] = MD[1] = MD[2] = SEED For i = 3 to 1003 MSG[i] = MD[i-3] || MD[i-2] || MD[i-1] MD[i] = SHA(MSG[i]) Output MD[1002] Figure 1: SHA-1 and SHA-2 Monte Carlo Test 6.3. Test Coverage The tests described in this document have the intention of ensuring an implementation is conformant to [FIPS180-4]. 6.3.1. SHA Requirements Covered Sections 3 and 4 in [FIPS180-4] outline the core functions used within the hash algorithms. Normal AFTs test these operations. Section 5 outlines the hash function preprocessing. It is worth noting that not all test cases will cover the message padding process, but through the entire vector set, this operation will be fully tested. 6.3.2. SHA Requirements Not Covered Section 1 in [FIPS180-4] outlines the maximum message sizes for each hash function. Due to the large size (either 2^64 or 2^128 bits) of these maximums, they are not tested by this specification. Section 7 outlines digest truncation for applications where a shortened digest is needed. These operations are not tested via this specification. Celi Expires 11 February 2021 [Page 4] Internet-Draft ACVP SHA August 2020 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 SHA 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 +===============+=============================+===========+ | JSON Property | Description | JSON Type | +===============+=============================+===========+ | algorithm | a prerequisite algorithm | string | +---------------+-----------------------------+-----------+ | valValue | algorithm validation number | string | +---------------+-----------------------------+-----------+ Table 1: Prerequisite Properties 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 Celi Expires 11 February 2021 [Page 5] Internet-Draft ACVP SHA August 2020 "prereqVals": [ { "algorithm": "Alg1", "valValue": "Val-1234" }, { "algorithm": "Alg2", "valValue": "same" } ] Figure 2 7.2. HASH Algorithm Capabilities Registration This section describes the constructs for advertising support of hash algorithms to the ACVP server. +===============+=======================================+========+ | JSON Value | Description | JSON | | | | type | +===============+=======================================+========+ | algorithm | The hash algorithm and mode to be | string | | | validated. | | +---------------+---------------------------------------+--------+ | revision | The algorithm testing revision to | string | | | use. | | +---------------+---------------------------------------+--------+ | messageLength | The message lengths in bits supported | domain | | | by the IUT. Minimum allowed is 0, | | | | maximum allowed is 65535. | | +---------------+---------------------------------------+--------+ Table 2: Hash Algorithm Capabilities JSON Values The value of the algorithm property MUST be one of the elements from the list in Section 5. 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 Secure Hash Algorithm (SHA) algorithms. Celi Expires 11 February 2021 [Page 6] Internet-Draft ACVP SHA August 2020 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 Values | Description | JSON Type | +=============+======================================+===========+ | acvVersion | Protocol version identifier | string | +-------------+--------------------------------------+-----------+ | vsId | Unique numeric vector set identifier | integer | +-------------+--------------------------------------+-----------+ | algorithm | Algorithm defined in the capability | string | | | exchange | | +-------------+--------------------------------------+-----------+ | mode | Mode defined in the capability | string | | | exchange | | +-------------+--------------------------------------+-----------+ | revision | Protocol test revision selected | string | +-------------+--------------------------------------+-----------+ | testGroups | Array of test groups containing test | array | | | data, see Section 8.1 | | +-------------+--------------------------------------+-----------+ Table 3: Top Level Test Vector JSON Elements An example of this would look like this { "acvVersion": "version", "vsId": 1, "algorithm": "Alg1", "mode": "Mode1", "revision": "Revision1.0", "testGroups": [ ... ] } Figure 3 Celi Expires 11 February 2021 [Page 7] Internet-Draft ACVP SHA August 2020 8.1. Test Groups Test vector sets MUST contain one or many test groups, each sharing similar properties. For instance, all test vectors that use the same testType would be grouped together. The testGroups element at the top level of the test vector JSON object SHALL be the array of test groups. The Test Group JSON object MUST contain meta-data that applies to all test cases within the group. The following table describes the JSON elements that MAY appear from the server in the Test Group JSON object: +==========+===========================================+==========+ | JSON | Description | JSON | | Value | | type | +==========+===========================================+==========+ | tgId | Numeric identifier for the test group, | integer | | | unique across the entire vector set | | +----------+-------------------------------------------+----------+ | testType | Test category type (AFT or MCT). See | string | | | Section 6 for more information | | +----------+-------------------------------------------+----------+ | tests | Array of individual test case JSON | array of | | | objects, which are defined in Section 8.2 | testCase | | | | objects | +----------+-------------------------------------------+----------+ Table 4: Test Group JSON Object All properties described in the previous table MUST appear in the prompt file from the server for every testGroup object. 8.2. Test Case Each test group SHALL contain an array of one or more test cases. Each test case is a JSON object that represents a single case to be processed by the ACVP client. The following table describes the JSON elements for each test case. Celi Expires 11 February 2021 [Page 8] Internet-Draft ACVP SHA August 2020 +============+=======================================+===========+ | JSON Value | Description | JSON type | +============+=======================================+===========+ | tcId | Numeric identifier for the test case, | integer | | | unique across the entire vector set. | | +------------+---------------------------------------+-----------+ | len | Length of the message or MCT seed | integer | +------------+---------------------------------------+-----------+ | msg | Value of the message or MCT seed in | integer | | | big-endian hex | | +------------+---------------------------------------+-----------+ Table 5: Test Case JSON Object All properties described in the previous table MUST appear in the prompt file from the server for every testCase object. 8.3. Test Vector Responses After the ACVP client downloads and processes a vector set, it SHALL send the response vectors back to the ACVP server within the alloted timeframe. The following table describes the JSON object that represents a vector set response. +=============+==================================+===========+ | JSON Value | Description | JSON type | +=============+==================================+===========+ | acvVersion | Protocol version identifier | string | +-------------+----------------------------------+-----------+ | vsId | Unique numeric identifier for | integer | | | the vector set | | +-------------+----------------------------------+-----------+ | testResults | Array of JSON objects that | array of | | | represent each test vector | testGroup | | | result, which uses the same JSON | objects | | | schema as defined in Section 8.2 | | +-------------+----------------------------------+-----------+ Table 6: Vector Set Response JSON Object The testGroup Response 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 its response. This structure helps accommodate that. Celi Expires 11 February 2021 [Page 9] Internet-Draft ACVP SHA August 2020 +============+=============================+==================+ | JSON Value | Description | JSON type | +============+=============================+==================+ | tgId | The test group identifier | integer | +------------+-----------------------------+------------------+ | tests | The tests associated to the | array of | | | group specified in tgId | testCase objects | +------------+-----------------------------+------------------+ Table 7: Vector Set Group Response JSON Object Each test case is a JSON object that represents a single test object to be processed by the ACVP client. The following table describes the JSON elements for each test case object. +==============+=======================================+============+ | JSON Value | Description | JSON type | +==============+=======================================+============+ | tcId | Numeric identifier for the | integer | | | test case, unique across | | | | the entire vector set. | | +--------------+---------------------------------------+------------+ | md | The IUT's message digest | string | | | response to an AFT test | (hex) | +--------------+---------------------------------------+------------+ | resultsArray | Array of JSON objects that | array of | | | represent each iteration of | objects | | | an MCT. Each iteration | containing | | | will contain the msg and md | the md | +--------------+---------------------------------------+------------+ Table 8: Test Case Results JSON Object Note: The tcId MUST be included in every test case object sent between the client and the server. 9. Security Considerations There are no additional security considerations outside of those outlined in the ACVP document. 10. IANA Considerations This document does not require any action by IANA. Celi Expires 11 February 2021 [Page 10] Internet-Draft ACVP SHA August 2020 11. Example Secure Hash Capabilities JSON Object The following is a example JSON object advertising support for SHA- 256. { "algorithm": "SHA2-256", "revision": "1.0", "messageLength": [{"min": 0, "max": 65535, "increment": 1}] } Figure 4 12. Example Test Vectors JSON Object The following is an example JSON object for secure hash test vectors sent from the ACVP server to the crypto module. Note the single bit message is represented as "80". This complies with SHA1 and SHA2 being big-endian by nature. All hex strings associated with SHA1 and SHA2 will be big-endian. [ { "acvVersion": }, { "vsId": 1564, "algorithm": "SHA2-512/224", "revision": "1.0", "testGroups": [ { "testType": "AFT", "tests": [ { "tcId": 0, "len": 0, "msg": "00" }, { "tcId": 1, "len": 1, "msg": "80" }] }] }] Figure 5 The following is another example JSON object for secure hash test vectors sent from the ACVP server to the crypto module. Celi Expires 11 February 2021 [Page 11] Internet-Draft ACVP SHA August 2020 [ { "acvVersion": }, { "vsId": 1564, "algorithm": "SHA2-256", "revision": "1.0", "testGroups": [ { "testType": "AFT", "tests": [ { "tcId": 2170, "len": 1304, "msg": "7f65733c73c6d9b06838ca3fd3f0fed4c642c58bba59ed0c8b2ae618c4aa24611d3fc59f427574e0d6f38d1fb8ad8119855b7d5c5e2946a1ebb0685b9f258f903ed035e89dc07d04aabe5f10ab7f069ccb1e76a7d2c972fd34ba9dc44d68df51ebff0a400d0ebec3ea808a3a35ce5304a073fa959f9f39c96e2fce7855dddc4b2bb48ece19c8fdc6a02354c4dd0232fa0c424f4e4c1563ada1f943a23feb4d2706d707" }, { "tcId": 2171, "len": 2096, "msg": "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" }] }] }] Figure 6 The following is an example JSON object for secure hash Monte Carlo test vectors sent from the ACVP server to the crypto module. [ { "acvVersion": }, { "vsId": 1564, "algorithm": "SHA-1", "revision": "1.0", "testGroups": [ { "testType": "MCT", "tests": [ { "tcId": 2175, "len": 20, "msg": "331b04d56f6e3ed5af349bf1fd9f9591b6ec886e", }] }] }] Figure 7 Celi Expires 11 February 2021 [Page 12] Internet-Draft ACVP SHA August 2020 13. Example Test Results JSON Object The following is a example JSON object for secure hash test results sent from the crypto module to the ACVP server. [ { "acvVersion": }, { "vsId": 1564, "testResults": [ { "tcId": 2170, "md": "7115011d389f379798455039d5da962a077d1620d52d7e983af9b49e3c4283f3" }, { "tcId": 2171, "md": "79820a5256eb1371cf8bc94fa17eaedc25aa5d28ae8706cbf77b9a6e3a79acd5" }] }] Figure 8 The following is a example JSON object for secure hash Monte Carlo test results sent from the crypto module to the ACVP server. Reduced to 2 iterations for brevity. [ { "acvVersion": }, { "vsId": 1564, "testResults": [ { "tcId": 10246, "resultsArray": [ { "md": "220b2bd187bd61affab14cdcfe76dce236c56a9072d55b4f6ac0b739e3c023f7" }, { "md": "5eec0361d25bfbc2468d70e2262783145523ffe627052585069413d30ff2caf9" }, { "md": "efbed7619701beda3eeb79946565cf33643b45783f38a4f8a855607bd4d23ce6" }] }] } Figure 9 14. Normative references Celi Expires 11 February 2021 [Page 13] Internet-Draft ACVP SHA August 2020 [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, . [RFC7991] Hoffman, P., "The "xml2rfc" Version 3 Vocabulary", IETF RFC 7991, IETF RFC 7991, DOI 10.17487/RFC7991, December 2016, . [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, . [ACVP] National Institute of Standards and Technology, "Automatic Cryptographic Validation Protocol", ACVP ACVP, 2019. [FIPS180-4] "Secure Hash Standard (SHS)", FIPS FIPS 180-4. [SHAVS] "The Secure Hash Algorithm Validation System (SHAVS)", NIST NIST SHAVS. Author's Address Christopher Celi (editor) Email: christopher.celi@nist.gov Celi Expires 11 February 2021 [Page 14]