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<link href="#rfc.toc" rel="Contents">
<link href="#rfc.section.1" rel="Chapter" title="1 Introduction">
<link href="#rfc.section.1.1" rel="Chapter" title="1.1 Requirements Language">
<link href="#rfc.section.1.2" rel="Chapter" title="1.2 Default values">
<link href="#rfc.section.2" rel="Chapter" title="2 Test Types and Test Coverage">
<link href="#rfc.section.2.1" rel="Chapter" title="2.1 Test Coverage">
<link href="#rfc.section.2.1.1" rel="Chapter" title="2.1.1 Requirements Covered">
<link href="#rfc.section.2.1.2" rel="Chapter" title="2.1.2 Requirements Not Covered">
<link href="#rfc.section.3" rel="Chapter" title="3 Capabilities Registration">
<link href="#rfc.section.3.1" rel="Chapter" title="3.1 Supported DRBG Algorithms">
<link href="#rfc.section.3.1.1" rel="Chapter" title="3.1.1 Supported values per DRBG option">
<link href="#rfc.section.3.2" rel="Chapter" title="3.2 Required Prerequisite Algorithms for DRBG Validations">
<link href="#rfc.section.3.3" rel="Chapter" title="3.3 Supported DRBG Algorithm Capabilities">
<link href="#rfc.section.4" rel="Chapter" title="4 Test Vectors">
<link href="#rfc.section.4.1" rel="Chapter" title="4.1 Test Groups JSON Schema">
<link href="#rfc.section.4.2" rel="Chapter" title="4.2 Test Case JSON Schema">
<link href="#rfc.section.5" rel="Chapter" title="5 Test Vector Responses">
<link href="#rfc.section.6" rel="Chapter" title="6 Acknowledgements">
<link href="#rfc.section.7" rel="Chapter" title="7 IANA Considerations">
<link href="#rfc.section.8" rel="Chapter" title="8 Security Considerations">
<link href="#rfc.references" rel="Chapter" title="9 Normative References">
<link href="#rfc.appendix.A" rel="Chapter" title="A Example DRBG Capabilities JSON Object">
<link href="#rfc.appendix.B" rel="Chapter" title="B Example Test Vectors JSON Object">
<link href="#rfc.appendix.C" rel="Chapter" title="C Example Test Results JSON Object">
<link href="#rfc.authors" rel="Chapter">
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<meta name="dct.creator" content="Vassilev, A., Ed." />
<meta name="dct.identifier" content="urn:ietf:id:draft-ietf-acvp-subdrbg-1.0" />
<meta name="dct.issued" scheme="ISO8601" content="2018-11-01" />
<meta name="dct.abstract" content="This document defines the JSON schema for testing DRBG implementations from SP 800-90A with the ACVP specification." />
<meta name="description" content="This document defines the JSON schema for testing DRBG implementations from SP 800-90A with the ACVP specification." />
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<table class="header">
<tbody>
<tr>
<td class="left">TBD</td>
<td class="right">A. Vassilev, Ed.</td>
</tr>
<tr>
<td class="left">Internet-Draft</td>
<td class="right">National Institute of Standards and Technology</td>
</tr>
<tr>
<td class="left">Intended status: Informational</td>
<td class="right">November 1, 2018</td>
</tr>
<tr>
<td class="left">Expires: May 5, 2019</td>
<td class="right"></td>
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<p class="title">ACVP Deterministic Random Bit Generator (DRBG) Algorithm JSON Specification<br />
<span class="filename">draft-ietf-acvp-subdrbg-1.0</span></p>
<h1 id="rfc.abstract"><a href="#rfc.abstract">Abstract</a></h1>
<p>This document defines the JSON schema for testing DRBG implementations from SP 800-90A with the ACVP specification.</p>
<h1 id="rfc.status"><a href="#rfc.status">Status of This Memo</a></h1>
<p>This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.</p>
<p>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/.</p>
<p>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."</p>
<p>This Internet-Draft will expire on May 5, 2019.</p>
<h1 id="rfc.copyrightnotice"><a href="#rfc.copyrightnotice">Copyright Notice</a></h1>
<p>Copyright (c) 2018 IETF Trust and the persons identified as the document authors. All rights reserved.</p>
<p>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.</p>
<hr class="noprint" />
<h1 class="np" id="rfc.toc"><a href="#rfc.toc">Table of Contents</a></h1>
<ul class="toc">
<li>1. <a href="#rfc.section.1">Introduction</a>
</li>
<ul><li>1.1. <a href="#rfc.section.1.1">Requirements Language</a>
</li>
<li>1.2. <a href="#rfc.section.1.2">Default values</a>
</li>
</ul><li>2. <a href="#rfc.section.2">Test Types and Test Coverage</a>
</li>
<ul><li>2.1. <a href="#rfc.section.2.1">Test Coverage</a>
</li>
<ul><li>2.1.1. <a href="#rfc.section.2.1.1">Requirements Covered</a>
</li>
<li>2.1.2. <a href="#rfc.section.2.1.2">Requirements Not Covered</a>
</li>
</ul></ul><li>3. <a href="#rfc.section.3">Capabilities Registration</a>
</li>
<ul><li>3.1. <a href="#rfc.section.3.1">Supported DRBG Algorithms</a>
</li>
<ul><li>3.1.1. <a href="#rfc.section.3.1.1">Supported values per DRBG option</a>
</li>
</ul><li>3.2. <a href="#rfc.section.3.2">Required Prerequisite Algorithms for DRBG Validations</a>
</li>
<li>3.3. <a href="#rfc.section.3.3">Supported DRBG Algorithm Capabilities</a>
</li>
</ul><li>4. <a href="#rfc.section.4">Test Vectors</a>
</li>
<ul><li>4.1. <a href="#rfc.section.4.1">Test Groups JSON Schema</a>
</li>
<li>4.2. <a href="#rfc.section.4.2">Test Case JSON Schema</a>
</li>
</ul><li>5. <a href="#rfc.section.5">Test Vector Responses</a>
</li>
<li>6. <a href="#rfc.section.6">Acknowledgements</a>
</li>
<li>7. <a href="#rfc.section.7">IANA Considerations</a>
</li>
<li>8. <a href="#rfc.section.8">Security Considerations</a>
</li>
<li>9. <a href="#rfc.references">Normative References</a>
</li>
<li>Appendix A. <a href="#rfc.appendix.A">Example DRBG Capabilities JSON Object</a>
</li>
<li>Appendix B. <a href="#rfc.appendix.B">Example Test Vectors JSON Object</a>
</li>
<li>Appendix C. <a href="#rfc.appendix.C">Example Test Results JSON Object</a>
</li>
<li><a href="#rfc.authors">Author's Address</a>
</li>
</ul>
<h1 id="rfc.section.1">
<a href="#rfc.section.1">1.</a> Introduction</h1>
<p id="rfc.section.1.p.1">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 NIST-approved DRBG algorithms from SP 800-90A <a href="#SP800-90A" class="xref">[SP800-90A]</a> using ACVP. </p>
<h1 id="rfc.section.1.1">
<a href="#rfc.section.1.1">1.1.</a> Requirements Language</h1>
<p id="rfc.section.1.1.p.1">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 <a href="#RFC2119" class="xref">RFC 2119</a>. </p>
<h1 id="rfc.section.1.2">
<a href="#rfc.section.1.2">1.2.</a> <a href="#defaults_def" id="defaults_def">Default values</a>
</h1>
<p id="rfc.section.1.2.p.1">ACVP has default values for many of the input parameters for testing the DRBG algorithms.For example, the Entropy Input, Nonce, Personalization String, and Addtional Input parameters have default values. The specific details and restrictions on each of these input lengths is specified in <a href="#caps_reg" class="xref">Section 3</a> , <a href="#caps_table" class="xref">Table 5</a> and the notes following it. To indicate a preference for using a default value for any of these parameters, the value zero (0) should be set. If the implementation does not support one of these defaults, the corresponding supported bit length values shall be set explicitly. </p>
<h1 id="rfc.section.2">
<a href="#rfc.section.2">2.</a> <a href="#test_types" id="test_types">Test Types and Test Coverage</a>
</h1>
<p id="rfc.section.2.p.1">The ACVP server performs a set of tests on the IUT's DRBG in order to assess the correctness and robustness of the implementation. A typical ACVP validation session would require multiple tests to be performed for every supported permutation of DRBG capabilities. This section describes the design of the tests used to validate implementations of the DRBG algorithms. There is a single test type for DRBG testing: </p>
<ul class="empty"><li>"AFT" - Algorithm Function Test. In the AFT test mode, the IUT MUST be capable of injecting the values provided by the ACVP server, into their IUT's implementation. The IUT is REQUIRED to run the DRBG function calls, depending on registration options, as defined in <a href="#tests_table" class="xref">Table 8</a> </li></ul>
<p> </p>
<h1 id="rfc.section.2.1">
<a href="#rfc.section.2.1">2.1.</a> <a href="#test_coverage" id="test_coverage">Test Coverage</a>
</h1>
<p id="rfc.section.2.1.p.1">The tests described in this document have the intention of ensuring an implementation is conformant to <a href="#SP800-90A" class="xref">[SP800-90A]</a>. </p>
<h1 id="rfc.section.2.1.1">
<a href="#rfc.section.2.1.1">2.1.1.</a> <a href="#requirements_covered" id="requirements_covered">Requirements Covered</a>
</h1>
<p></p>
<ul class="empty">
<li>SP 800-90A - 7.1 Entropy Input. The IUT is REQUIRED to inject the ACVP server's provided entropy for testing. </li>
<li>SP 800-90A - 7.2 Other Inputs. The IUT is REQUIRED to inject the ACVP server's provided other input information for testing. </li>
<li>SP 800-90A - 7.3 Internal State. Indirect testing of the IUT's DRBG internal state SHALL be inferred through multiple calls to the DRBG "generate" function. Multiple calls SHALL ensure the internal state is successfully mutated for each "generate" invocation. </li>
<li>SP 800-90A - 7.4 The DRBG Mechanism Functions. "Instantiate", "Generate", and "Reseed" DRBG functions SHALL be tested within the ACVP server's provided tests. </li>
<li>SP 800-90A - 8 DRBG Mechanism Concepts and General Requirements. The ACVP server SHALL validate "Instantiate", "Generate", and "Reseed" are properly implemented. Reseeding is partially tested through ACVP test vectors through an explicit reseed operation. </li>
<li>SP 800-90A - 9 DRBG Mechanism Functions. "Instantiate", "Generate", and "Reseed" SHALL be evaluated as a part of ACVP generated tests. </li>
<li>SP 800-90A - 10 DRBG Algorithm Specifications. "Instantiate", "Generate", and "Reseed" DRBG functions in scope SHALL be tested as per the specifications in this section. </li>
</ul>
<p> </p>
<h1 id="rfc.section.2.1.2">
<a href="#rfc.section.2.1.2">2.1.2.</a> <a href="#requirements_not_covered" id="requirements_not_covered">Requirements Not Covered</a>
</h1>
<p></p>
<ul class="empty">
<li>SP 800-90A - 7.1 Entropy Input. The ACVP Server SHALL provide all instances of randomness to utilize from the IUT's perspective, Implementation of the IUT's RBG SHALL NOT be in scope of testing. </li>
<li>SP 800-90A - 7.2 Other Inputs. The ACVP server SHALL provide all instances of randomness throughout the IUT's testing of the DRBG. </li>
<li>SP 800-90A - 7.3 Internal State. Though direct testing of the IUT's internal state SHALL NOT be not performed, the act of testing multiple "generate" outputs from the IUT DRBG helps to ensure a successful IUT implementation. </li>
<li>SP 800-90A - 7.4 The DRBG Mechanism Functions. "Uninstantiate", "Health Test" SHALL NOT be in scope of testing. </li>
<li>SP 800-90A - 8 DRBG Mechanism Concepts and General Requirements. The ACVP server SHALL NOT directly validate internal DRBG state. Additionally, DRBG boundaries are out of scope of ACVP testing. Seed construction is performed by the ACVP server, the IUT is REQUIRED to utilize the ACVP provided seed (via entropy, inputs, etc) to perform validation testing. Reseeds operations that are performed automatically due to a large number of generate operations, SHALL NOT be in scope of ACVP testing. </li>
<li>SP 800-90A - 9 DRBG Mechanism Functions. Error conditions (CATASTROPHIC_ERROR_FLAG or otherwise), reseeding due to end of seed life, uninstantiation, and health checks are out of scope of ACVP tests. </li>
<li>SP 800-90A - 10 DRBG Algorithm Specifications. All previously mentioned DRBG functions that are not in scope - Uninstantiate, Health check, automatic reseed, error conditions - SHALL NOT be tested as part of testing. </li>
<li>SP 800-90A - 11 Assurances. Health check and error handling testing SHALL NOT be performed within the scope of ACVP testing. </li>
</ul>
<p> </p>
<h1 id="rfc.section.3">
<a href="#rfc.section.3">3.</a> <a href="#caps_reg" id="caps_reg">Capabilities Registration</a>
</h1>
<p id="rfc.section.3.p.1">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 DRBG algorithms to the ACVP server.</p>
<h1 id="rfc.section.3.1">
<a href="#rfc.section.3.1">3.1.</a> <a href="#supported_algs" id="supported_algs">Supported DRBG Algorithms</a>
</h1>
<p id="rfc.section.3.1.p.1">The following DRBG algorithms and modes may be advertised by the ACVP compliant crypto module:</p>
<div id="rfc.table.1"></div>
<div id="algs_table"></div>
<table cellpadding="3" cellspacing="0" class="tt full center">
<caption>Supported DRBG Algorithm and Modes JSON Values</caption>
<thead><tr>
<th class="left">JSON algorithm value</th>
<th class="left">JSON mode value</th>
</tr></thead>
<tbody>
<tr>
<td class="left">"hashDRBG"</td>
<td class="left">"SHA-1"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-224"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-256"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-384"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-512"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-512/224"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-512/256"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left"></td>
</tr>
<tr>
<td class="left">"hmacDRBG"</td>
<td class="left">"SHA-1"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-224"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-256"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-384"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-512"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-512/224"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"SHA2-512/256"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left"></td>
</tr>
<tr>
<td class="left">"ctrDRBG"</td>
<td class="left">"TDES"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"AES-128"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"AES-192"</td>
</tr>
<tr>
<td class="left"></td>
<td class="left">"AES-256"</td>
</tr>
</tbody>
</table>
<p id="rfc.section.3.1.p.2">Note 1: The ctrDRBG algorithm in TDES mode shall only be used with the three-key option of the Triple-DES algorithm. </p>
<h1 id="rfc.section.3.1.1">
<a href="#rfc.section.3.1.1">3.1.1.</a> <a href="#value_req_per_option" id="value_req_per_option">Supported values per DRBG option</a>
</h1>
<p id="rfc.section.3.1.1.p.1">DRBG minimum/maximum values for several options such as minimum entropy and nonce, vary depending on the DRBG capabilities registered. The following table depicts those values</p>
<div id="rfc.table.2"></div>
<div id="value_req_per_option_table"></div>
<table cellpadding="3" cellspacing="0" class="tt full center">
<caption>Supported values per DRBG option table</caption>
<thead><tr>
<th class="left">DRBG Algorithm</th>
<th class="left">Mode</th>
<th class="left">Derivation Function</th>
<th class="left">Security Strength</th>
<th class="left">Min Entropy</th>
<th class="left">Max Entropy</th>
<th class="left">Max PersoString</th>
<th class="left">Max Addl String</th>
<th class="left">Min Nonce</th>
</tr></thead>
<tbody>
<tr>
<td class="left">Counter</td>
<td class="left">AES128</td>
<td class="left">TRUE</td>
<td class="left">128</td>
<td class="left">128</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">64</td>
</tr>
<tr>
<td class="left">Counter</td>
<td class="left">AES192</td>
<td class="left">TRUE</td>
<td class="left">192</td>
<td class="left">192</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">96</td>
</tr>
<tr>
<td class="left">Counter</td>
<td class="left">AES256</td>
<td class="left">TRUE</td>
<td class="left">256</td>
<td class="left">256</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">128</td>
</tr>
<tr>
<td class="left">Counter</td>
<td class="left">TDES</td>
<td class="left">TRUE</td>
<td class="left">112</td>
<td class="left">112</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">56</td>
</tr>
<tr>
<td class="left">Counter</td>
<td class="left">AES128</td>
<td class="left">FALSE</td>
<td class="left">128</td>
<td class="left">256</td>
<td class="left">256</td>
<td class="left">256</td>
<td class="left">256</td>
<td class="left">0</td>
</tr>
<tr>
<td class="left">Counter</td>
<td class="left">AES192</td>
<td class="left">FALSE</td>
<td class="left">192</td>
<td class="left">320</td>
<td class="left">320</td>
<td class="left">320</td>
<td class="left">320</td>
<td class="left">0</td>
</tr>
<tr>
<td class="left">Counter</td>
<td class="left">AES256</td>
<td class="left">FALSE</td>
<td class="left">256</td>
<td class="left">384</td>
<td class="left">384</td>
<td class="left">384</td>
<td class="left">384</td>
<td class="left">0</td>
</tr>
<tr>
<td class="left">Counter</td>
<td class="left">TDES</td>
<td class="left">FALSE</td>
<td class="left">112</td>
<td class="left">232</td>
<td class="left">232</td>
<td class="left">232</td>
<td class="left">232</td>
<td class="left">0</td>
</tr>
<tr>
<td class="left">Hash</td>
<td class="left">SHA1</td>
<td class="left">N/A</td>
<td class="left">80</td>
<td class="left">80</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">40</td>
</tr>
<tr>
<td class="left">Hash</td>
<td class="left">SHA2-224</td>
<td class="left">N/A</td>
<td class="left">112</td>
<td class="left">112</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">56</td>
</tr>
<tr>
<td class="left">Hash</td>
<td class="left">SHA2-256</td>
<td class="left">N/A</td>
<td class="left">128</td>
<td class="left">128</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">64</td>
</tr>
<tr>
<td class="left">Hash</td>
<td class="left">SHA2-384</td>
<td class="left">N/A</td>
<td class="left">192</td>
<td class="left">192</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">96</td>
</tr>
<tr>
<td class="left">Hash</td>
<td class="left">SHA2-512</td>
<td class="left">N/A</td>
<td class="left">256</td>
<td class="left">256</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">128</td>
</tr>
<tr>
<td class="left">Hash</td>
<td class="left">SHA2-512/224</td>
<td class="left">N/A</td>
<td class="left">112</td>
<td class="left">112</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">56</td>
</tr>
<tr>
<td class="left">Hash</td>
<td class="left">SHA2-512/256</td>
<td class="left">N/A</td>
<td class="left">128</td>
<td class="left">128</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">64</td>
</tr>
<tr>
<td class="left">Hmac</td>
<td class="left">SHA1</td>
<td class="left">N/A</td>
<td class="left">128</td>
<td class="left">128</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">64</td>
</tr>
<tr>
<td class="left">Hmac</td>
<td class="left">SHA2-224</td>
<td class="left">N/A</td>
<td class="left">192</td>
<td class="left">192</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">96</td>
</tr>
<tr>
<td class="left">Hmac</td>
<td class="left">SHA2-256</td>
<td class="left">N/A</td>
<td class="left">256</td>
<td class="left">256</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">128</td>
</tr>
<tr>
<td class="left">Hmac</td>
<td class="left">SHA2-384</td>
<td class="left">N/A</td>
<td class="left">256</td>
<td class="left">256</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">128</td>
</tr>
<tr>
<td class="left">Hmac</td>
<td class="left">SHA2-512</td>
<td class="left">N/A</td>
<td class="left">256</td>
<td class="left">256</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">128</td>
</tr>
<tr>
<td class="left">Hmac</td>
<td class="left">SHA2-512/224</td>
<td class="left">N/A</td>
<td class="left">192</td>
<td class="left">192</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">96</td>
</tr>
<tr>
<td class="left">Hmac</td>
<td class="left">SHA2-512/256</td>
<td class="left">N/A</td>
<td class="left">256</td>
<td class="left">256</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">2^35</td>
<td class="left">128</td>
</tr>
</tbody>
</table>
<h1 id="rfc.section.3.2">
<a href="#rfc.section.3.2">3.2.</a> <a href="#prereq_algs" id="prereq_algs">Required Prerequisite Algorithms for DRBG Validations</a>
</h1>
<p id="rfc.section.3.2.p.1">Each DRBG implementation relies on other cryptographic primitives (algorithms) - see <a href="#SP800-90A" class="xref">[SP800-90A]</a> . For example, a hashDRBG uses an underlying hash 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:</p>
<div id="rfc.table.3"></div>
<div id="rereqs_table"></div>
<table cellpadding="3" cellspacing="0" class="tt full center">
<caption>Required DRBG Prerequisite Algorithms JSON Values</caption>
<thead><tr>
<th class="left">JSON Value</th>
<th class="left">Description</th>
<th class="left">JSON type</th>
<th class="left">Valid Values</th>
<th class="left">Optional</th>
</tr></thead>
<tbody>
<tr>
<td class="left">algorithm</td>
<td class="left">a prerequisite algorithm</td>
<td class="left">value</td>
<td class="left">"SHA", "HMAC", "AES", "TDES"</td>
<td class="left">No</td>
</tr>
<tr>
<td class="left"></td>
<td class="left"></td>
<td class="left"></td>
<td class="left"></td>
<td class="left"></td>
</tr>
<tr>
<td class="left">valValue</td>
<td class="left">algorithm validation number</td>
<td class="left">value</td>
<td class="left">actual number, e.g. "123456", or "same"</td>
<td class="left">No</td>
</tr>
<tr>
<td class="left"></td>
<td class="left"></td>
<td class="left"></td>
<td class="left"></td>
<td class="left"></td>
</tr>
<tr>
<td class="left">prereqAlgVal</td>
<td class="left">prerequistie algorithm validation</td>
<td class="left">object with algorithm and valValue properties</td>
<td class="left">see above</td>
<td class="left">No</td>
</tr>
<tr>
<td class="left"></td>
<td class="left"></td>
<td class="left"></td>
<td class="left"></td>
<td class="left"></td>
</tr>
<tr>
<td class="left">prereqVals</td>
<td class="left">prerequistie algorithm validations</td>
<td class="left">array of prereqAlgVal objects</td>
<td class="left">see above</td>
<td class="left">No</td>
</tr>
</tbody>
</table>
<h1 id="rfc.section.3.3">
<a href="#rfc.section.3.3">3.3.</a> <a href="#supported_caps" id="supported_caps">Supported DRBG Algorithm Capabilities</a>
</h1>
<p id="rfc.section.3.3.p.1">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 DRBG mode capability advertised is a self-contained JSON object. The following JSON values are used for DRBG mode capabilities:</p>