Network Working Group N. Mavrogiannopoulos Internet-Draft Red Hat Updates: 5208 (if approved) August 8, 2017 Intended status: Informational Expires: February 9, 2018 Storing private key validation parameters in PKCS#8 draft-mavrogiannopoulos-pkcs8-validated-parameters-00 Abstract This memo describes a method of storing parameters needed for private key validation in the Private-Key Information Syntax Specification Version 1.2 [RFC5208] (PKCS#8) format. 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 http://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 9, 2018. Copyright Notice Copyright (c) 2017 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 (http://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. Mavrogiannopoulos Expires February 9, 2018 [Page 1] Internet-DrafStoring private key validation parameters in PK August 2017 1. Introduction RSA or DSA private keys generated using the Shawe-Taylor prime generation algorithm describled in [FIPS186-4] allow for parameter validation, i.e., verify whether the primes are actually prime, and were correctly generated. That is done by generating the parameters from a known seed and a selected hash algorithm. Storing these parameters in a private key format such as the RSA Private Key Syntax from PKCS#1 [RFC8017], or common representations for DSA private keys, does not allow attaching information on the parameters needed for validation. The purpose of the document is to describe such a method using the Private-Key Information Syntax Specification Version 1.2 [RFC5208] format. 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 3. ValidationParams attribute The information related to the validated parameters is stored as an attribute in the PrivateKeyInfo structure. The attribute is identified by the id-attr-validated-parameters object identifier and contains as AttributeValue a single ValidationParams structure. id-attr-validated-parameters OBJECT IDENTIFIER ::= {1 3 6 1 4 1 2312 18 8 1} ValidationParams ::= SEQUENCE { algorithm OBJECT IDENTIFIER, seed OCTET STRING } The algorithm identifier in the ValidationParams should be a hash algorithm identifier for the [FIPS186-4] methods. 4. Example Structure The following structure contains an RSA key generated using the [FIPS186-4] section B.3.3 algorithm with SHA2-384 hash. The seed used is '8af4328c87bebcec31e303b8f5537effcb6a91d947084d99a369823b36f01462' (hex encoded). Mavrogiannopoulos Expires February 9, 2018 [Page 2] Internet-DrafStoring private key validation parameters in PK August 2017 -----BEGIN PRIVATE KEY----- MIIE/gIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCpPwXwfhDsWA3q jN2BWg1xfDjvZDVNfgTV/b95g304Aty3z13xPXAhHZ3ROW3pgPxTj9fiq7ZMy4Ua gMpPK81v3pHX1uokC2KcGXbgbAq2Q8ClxSXgEJllRwDENufjEdV10gArt8NlIP0N lota1kQUuI1DMsqc5DTIa35Nq4j1GW+KmLtP0kCrGq9fMGwjDbPEpSp9DTquEMHJ o7kyJIjB+93ikLvBUTgbxr+jcnTLXuhA8rC8r+KXre4NPPNPRyefRcALLt/URvfA rTvFOQfi3vIjNhBZL5FdC+FVAr5QnF3r2+cuDPbnczr4/rr81kzFGWrwyAgF5FWu pFtB5IYDAgMBAAECggEAHZ88vGNsNdmRkfhWupGW4cKCuo+Y7re8Q/H2Jd/4Nin2 FKvUPuloaztiSGDbVm+vejama/Nu5FEIumNJRYMeoVJcx2DDuUxO1ZB1aIEwfMct /DWd0/JDzuCXB0Cu5GTWLhlz0zMGHXihIdQ0DtGKt++3Ncg5gy1D+cIqqJB515/z jYdZmb0Wqmz7H3DisuxvnhiCAOuNrjcDau80hpMA9TQlb+XKNGHIBgKpJe6lnB0P MsS/AjDiDoEpP9GG9mv9+96rAga4Nos6avYlwWwbC6d+hHIWvWEWsmrDfcJlm2gN tjvG8omj00t5dAt7qGhfOoNDGr5tvJVo/g96O/0I8QKBgQDdzytVRulo9aKVdAYW /Nj04thtnRaqsTyFH+7ibEVwNIUuld/Bp6NnuGrY+K1siX8+zA9f8mKxuXXV9KK4 O89Ypw9js2BxM7VYO9Gmp6e1RY3Rrd8w7pG7/KqoPWXkuixTay9eybrJMWu3TT36 q7NheNmBHqcFmSQQuUwEmvp3MQKBgQDDVaisMJkc/sIyQh3XrlfzmMLK+GlPDucD w5e50fHl8Q5PmTcP20zVLhTevffCqeItSyeAno94Xdzc9vZ/rt69410kJEHyBO9L CmhtYz94wvSdRhbqf4VzAl2WU184sIYiIZDGsnGScgIYvo6v6mITjRhc8AMdYoPR rL6xp6frcwKBgFi1+avCj6mFzD+fxqu89nyCmXLFiAI+nmjTy7PM/7yPlNB76qDG Dil2bW1Xj+y/1R9ld6S1CVnxRbqLe+TZLuVS82m5nRHJT3b5fbD8jquGJOE+e+xT DgA0XoCpBa6D8yRt0uVDIyxCUsVd5DL0JusN7VehzcUEaZMyuL+CyDeRAoGBAImB qH6mq3Kc6Komnwlw4ttJ436sxr1vuTKOIyYdZBNB0Zg5PGi+MWU0zl5LDroLi3vl FwbVGBxcvxkSBU63FHhKMQw7Ne0gii+iQQcYQdtKKpb4ezNS1+exd55WTIcExTgL tvYZMhgsh8tRgfLWpXor7kWmdBrgeflFiOxZIL1/AoGAeBP7sdE+gzsh8jqFnVRj 7nOg+YllJAlWsf7cTH4pLIy2Eo9D+cNjhL9LK6RaAd7PSZ1adm8HfaROA2cfCm84 RI4c7Ue0G+N6LZiFvC0Bfi5SaPVAExXOty8UqjOCoZavSaXBPuNcTXZuzswcgbxI G5/kaJNHoEcdlVsPsYWKRNKgPzA9BgorBgEEAZIIEggBMS8wLQYJYIZIAWUDBAIC BCCK9DKMh7687DHjA7j1U37/y2qR2UcITZmjaYI7NvAUYg== -----END PRIVATE KEY----- 5. Compatibility notes For compatibility it is RECOMMENDED that implementations following this document, support generation and validation using the SHA2-384 hash algorithm. This document intentionally ignores [RFC5958] as it enhances PKCS#8 [RFC5208] in a way that makes new keys incompatible with old parsers. 6. Security Considerations All the considerations in [RFC5208] apply. 7. IANA Considerations None. Mavrogiannopoulos Expires February 9, 2018 [Page 3] Internet-DrafStoring private key validation parameters in PK August 2017 8. References 8.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC5208] Kaliski, B., "Public-Key Cryptography Standards (PKCS) #8: Private-Key Information Syntax Specification Version 1.2", RFC 5208, DOI 10.17487/RFC5208, May 2008, . [FIPS186-4] Kerry, C. and P. Gallagher, "FIPS PUB 186-4: Digital Signature Standard (DSS)", FEDERAL INFORMATION PROCESSING STANDARDS PUBLICATION , July 2013. 8.2. Informative References [RFC8017] Moriarty, K., Ed., Kaliski, B., Jonsson, J., and A. Rusch, "PKCS #1: RSA Cryptography Specifications Version 2.2", RFC 8017, DOI 10.17487/RFC8017, November 2016, . [RFC5958] Turner, S., "Asymmetric Key Packages", RFC 5958, DOI 10.17487/RFC5958, August 2010, . Appendix A. Acknowledgements None. Author's Address Nikos Mavrogiannopoulos Red Hat, Inc. Brno Czech Republic Email: nmav@redhat.com Mavrogiannopoulos Expires February 9, 2018 [Page 4]