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Re: [lamps] dtaft-ietf-lamps-cmp-updates and rsaKeyLen

Russ Housley <housley@vigilsec.com> Wed, 16 September 2020 19:11 UTC

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From: Russ Housley <housley@vigilsec.com>
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Date: Wed, 16 Sep 2020 15:11:37 -0400
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To: "Brockhaus, Hendrik" <hendrik.brockhaus@siemens.com>
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Subject: Re: [lamps] dtaft-ietf-lamps-cmp-updates and rsaKeyLen
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Hendrik:

I had another though about rsaKeyLen.  RFC 4210 uses CertRequest as defined on RFC 4211 in the certificate request, which is:

   CertRequest ::= SEQUENCE {
      certReqId     INTEGER,        -- ID for matching request and reply
      certTemplate  CertTemplate, --Selected fields of cert to be issued
      controls      Controls OPTIONAL } -- Attributes affecting issuance

   Controls  ::= SEQUENCE SIZE(1..MAX) OF AttributeTypeAndValue

Would it be cleaner to define a new control for the rsaKeyLen?

These controls are already set up as an OID followed by one or more attribute values.  So this seems like a very clean way to provide a minimum RSA key size or a set of elliptic curves.

Russ

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