| RFC 9169 | New ASN.1 Modules for the ERS | December 2021 |
| Housley & Wallace | Informational | [Page] |
The Evidence Record Syntax (ERS) and the conventions for including theseevidence records in the Server-based Certificate Validation Protocol(SCVP) are expressed using ASN.1. This document offers alternative ASN.1modules that conform to the 2002 version of ASN.1 and employ theconventions adopted in RFCs 5911, 5912, and 6268. There are nobits-on-the-wire changes to any of the formats; this is simply a changeto the ASN.1 syntax.¶
This document is not an Internet Standards Track specification; it is published for informational purposes.¶
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are candidates for any level of Internet Standard; see Section 2 of RFC 7841.¶
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained athttps://www.rfc-editor.org/info/rfc9169.¶
Copyright (c) 2021 IETF Trust and the persons identified as the document authors. All rights reserved.¶
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Some developers would like the IETF to use the latest version of ASN.1 inits standards. This document provides alternative ASN.1 modules to assistin that goal.¶
The Evidence Record Syntax (ERS)[RFC4998] provides two ASN.1 modules: one using the 1988 syntax[OLD-ASN1], which has been deprecated by the ITU-T, and another one using the newer syntax[NEW-ASN1], which continues to be maintained and enhanced. This document provides an alternative ASN.1 module that follows the conventions established in[RFC5911],[RFC5912], and[RFC6268].¶
In addition,[RFC5276] specifies the mechanism for conveying evidence records in the Server-based Certificate Validation Protocol (SCVP)[RFC5055]. There is only one ASN.1 module in[RFC5276], and it uses the 1988 syntax[OLD-ASN1]. This document provides an alternative ASN.1 module using the newer syntax[NEW-ASN1] and follows the conventions established in[RFC5911],[RFC5912], and[RFC6268]. Note that[RFC5912] already includes an alternative ASN.1 module for SCVP[RFC5055].¶
The original ASN.1 modules get some of their definitions from placesoutside the RFC series. Some of the referenced definitions are somewhatdifficult to find. The alternative ASN.1 modules offered in this documentstand on their own when combined with the modules in[RFC5911],[RFC5912], and[RFC6268].¶
The alternative ASN.1 modules produce the same bits on the wire as the original ones.¶
The alternative ASN.1 modules are informative; the original onesare normative.¶
<CODE BEGINS> ERS-2021 { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) ltans(11) id-mod(0) id-mod-ers(1) id-mod-ers-v2(2) } DEFINITIONS IMPLICIT TAGS ::= BEGIN EXPORTS ALL; IMPORTS ContentInfo FROM CryptographicMessageSyntax-2010 -- in [RFC6268] { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) modules(0) id-mod-cms-2009(58) } AlgorithmIdentifier{}, DIGEST-ALGORITHM FROM AlgorithmInformation-2009 -- in [RFC5912] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-algorithmInformation-02(58) } AttributeSet{}, ATTRIBUTE FROM PKIX-CommonTypes-2009 -- in [RFC5912] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-pkixCommon-02(57) } ; ltans OBJECT IDENTIFIER ::= { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) ltans(11) } EvidenceRecord ::= SEQUENCE { version INTEGER { v1(1) }, digestAlgorithms SEQUENCE OF AlgorithmIdentifier {DIGEST-ALGORITHM, {...}}, cryptoInfos [0] CryptoInfos OPTIONAL, encryptionInfo [1] EncryptionInfo OPTIONAL, archiveTimeStampSequence ArchiveTimeStampSequence } CryptoInfos ::= SEQUENCE SIZE (1..MAX) OF Attribute ArchiveTimeStamp ::= SEQUENCE { digestAlgorithm [0] AlgorithmIdentifier {DIGEST-ALGORITHM, {...}} OPTIONAL, attributes [1] Attributes OPTIONAL, reducedHashtree [2] SEQUENCE OF PartialHashtree OPTIONAL, timeStamp ContentInfo } PartialHashtree ::= SEQUENCE OF OCTET STRING Attributes ::= SET SIZE (1..MAX) OF Attribute ArchiveTimeStampChain ::= SEQUENCE OF ArchiveTimeStamp ArchiveTimeStampSequence ::= SEQUENCE OF ArchiveTimeStampChain EncryptionInfo ::= SEQUENCE { encryptionInfoType ENCINFO-TYPE.&id ({SupportedEncryptionAlgorithms}), encryptionInfoValue ENCINFO-TYPE.&Type ({SupportedEncryptionAlgorithms}{@encryptionInfoType}) } ENCINFO-TYPE ::= TYPE-IDENTIFIER SupportedEncryptionAlgorithms ENCINFO-TYPE ::= { ... } aa-er-internal ATTRIBUTE ::= { TYPE EvidenceRecord IDENTIFIED BY id-aa-er-internal } id-aa-er-internal OBJECT IDENTIFIER ::= { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9) smime(16) id-aa(2) 49 } aa-er-external ATTRIBUTE ::= { TYPE EvidenceRecord IDENTIFIED BY id-aa-er-external } id-aa-er-external OBJECT IDENTIFIER ::= { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9) smime(16) id-aa(2) 50 } ERSAttrSet ATTRIBUTE ::= { aa-er-internal | aa-er-external, ... } Attribute ::= AttributeSet {{ERSAttrSet}} END<CODE ENDS>¶<CODE BEGINS> LTANS-SCVP-EXTENSION-2021 { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) ltans(11) id-mod(0) id-mod-ers-scvp(5) id-mod-ers-scvp-v2(2) } DEFINITIONS IMPLICIT TAGS ::= BEGIN EXPORTS ALL; IMPORTS id-swb, CertBundle, WANT-BACK, AllWantBacks FROM SCVP-2009 -- in [RFC5912] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-scvp-02(52) } EvidenceRecord FROM ERS-2021 -- in [RFC9169] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) ltans(11) id-mod(0) id-mod-ers(1) id-mod-ers-v2(2) } ; EvidenceRecordWantBack ::= SEQUENCE { targetWantBack WANT-BACK.&id ({ExpandedWantBacks}), evidenceRecord EvidenceRecord OPTIONAL } EvidenceRecordWantBacks ::= SEQUENCE SIZE (1..MAX) OF EvidenceRecordWantBack EvidenceRecords ::= SEQUENCE SIZE (1..MAX) OF EvidenceRecord ExpandedWantBacks WANT-BACK ::= { AllWantBacks | NewWantBacks | ERSWantBacks, ... } NewWantBacks WANT-BACK ::= { swb-partial-cert-path, ... } swb-partial-cert-path WANT-BACK ::= { CertBundle IDENTIFIED BY id-swb-partial-cert-path } id-swb-partial-cert-path OBJECT IDENTIFIER ::= { id-swb 15 } ERSWantBacks WANT-BACK ::= { swb-ers-pkc-cert | swb-ers-best-cert-path | swb-ers-partial-cert-path | swb-ers-revocation-info | swb-ers-all, ... } swb-ers-pkc-cert WANT-BACK ::= { EvidenceRecord IDENTIFIED BY id-swb-ers-pkc-cert } id-swb-ers-pkc-cert OBJECT IDENTIFIER ::= { id-swb 16 } swb-ers-best-cert-path WANT-BACK ::= { EvidenceRecord IDENTIFIED BY id-swb-ers-best-cert-path } id-swb-ers-best-cert-path OBJECT IDENTIFIER ::= { id-swb 17 } swb-ers-partial-cert-path WANT-BACK ::= { EvidenceRecord IDENTIFIED BY id-swb-ers-partial-cert-path } id-swb-ers-partial-cert-path OBJECT IDENTIFIER ::= { id-swb 18 } swb-ers-revocation-info WANT-BACK ::= { EvidenceRecords IDENTIFIED BY id-swb-ers-revocation-info } id-swb-ers-revocation-info OBJECT IDENTIFIER ::= { id-swb 19 } swb-ers-all WANT-BACK ::= { EvidenceRecordWantBacks IDENTIFIED BY id-swb-ers-all } id-swb-ers-all OBJECT IDENTIFIER ::= { id-swb 20 } END<CODE ENDS>¶IANA has assigned two object identifiers from the "SMI Security for LTANS Module Identifier" registry to identifythe two ASN.1 modules in this document.¶
The following object identifiers have been assigned:¶
| OID Value | Description | Reference |
|---|---|---|
| 1.3.6.1.5.5.11.0.1.2 | id-mod-ers-v2 | RFC 9169 |
| 1.3.6.1.5.5.11.0.5.2 | id-mod-ers-scvp-v2 | RFC 9169 |
Please see the security considerations in[RFC4998] and[RFC5276]. Thisdocument makes no changes to the security considerations in thosedocuments. The ASN.1 modules in this document preserve bits on the wireas the ASN.1 modules that they replace.¶