Storing private key validation parameters in PKCS#8
draft-mavrogiannopoulos-pkcs8-validated-parameters-00

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Last updated 2017-12-10 (latest revision 2017-08-08)
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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
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   This Internet-Draft will expire on February 9, 2018.

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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).

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   -----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
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