[smime] [Technical Errata Reported] RFC5652 (5331)

RFC Errata System <rfc-editor@rfc-editor.org> Mon, 23 April 2018 14:39 UTC

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Subject: [smime] [Technical Errata Reported] RFC5652 (5331)
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The following errata report has been submitted for RFC5652,
"Cryptographic Message Syntax (CMS)".

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You may review the report below and at:
http://www.rfc-editor.org/errata/eid5331

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Type: Technical
Reported by: Thomas Stimm <thomas.stimm@escrypt.com>;

Section: 6.1 and 8

Original Text
-------------
EncryptedData ::= SEQUENCE {
   version CMSVersion,
   encryptedContentInfo EncryptedContentInfo,
   unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL }

EncryptedContentInfo ::= SEQUENCE {
   contentType ContentType,
   contentEncryptionAlgorithm ContentEncryptionAlgorithmIdentifier,
   encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL }


Corrected Text
--------------
EncryptedData ::= SEQUENCE {
   version CMSVersion,
   encryptedContentInfo EncryptedContentInfo,
   encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL,
   unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL }

EncryptedContentInfo ::= SEQUENCE {
   contentType ContentType,
   contentEncryptionAlgorithm ContentEncryptionAlgorithmIdentifier }


Notes
-----
- Wrong enumeration of UnprotectedAttributes OPTIONAL [1] instead of [0]. 
- ‘UnprotectedAttributes OPTIONAL’ makes only sense, if ‘EncryptedContent OPTIONAL’ is available.
- It seems that OpenSSL and wolfSSL are using the suggested wrapping and are not following the RFC, here.

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--------------------------------------
RFC5652 (draft-ietf-smime-rfc3852bis-00)
--------------------------------------
Title               : Cryptographic Message Syntax (CMS)
Publication Date    : September 2009
Author(s)           : R. Housley
Category            : DRAFT STANDARD
Source              : S/MIME Mail Security
Area                : Security
Stream              : IETF
Verifying Party     : IESG