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Subject: [OASIS Issue Tracker] Commented: (EBXMLMSG-45) PMode parameter for Key Transport algorithm
[ http://tools.oasis-open.org/issues/browse/EBXMLMSG-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=36589#action_36589 ]
Pim van der Eijk commented on EBXMLMSG-45:
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According to http://www.w3.org/TR/2013/REC-xmlenc-core1-20130411/#sec-RSA-OAEP, if the value for the key transport algorithm is http://www.w3.org/2009/xmlenc11#rsa-oaep then two other algorithms can be specified:
1) Mask generation function, with values like http://www.w3.org/2009/xmlenc11#mgf1sha256. Default is http://www.w3.org/2009/xmlenc11#mgf1sha1.
2) Key transport message digest function, with values like http://www.w3.org/2001/04/xmlenc#sha256. Default is http://www.w3.org/2000/09/xmldsig#rsa-sha1.
In both cases the defaults are discouraged.
This would mean three new parameters.
> PMode parameter for Key Transport algorithm
> -------------------------------------------
>
> Key: EBXMLMSG-45
> URL: http://tools.oasis-open.org/issues/browse/EBXMLMSG-45
> Project: OASIS ebXML Messaging Services TC
> Issue Type: Improvement
> Components: Core Spec
> Reporter: Pim van der Eijk
>
> For encryption, the core specification currently has a PMode PMode[1].Security.X509.Encryption.Algorithm which identifies "the encryption algorithm to be used" based on W3C XML Encryption algorithm identifiers.
> XML Encryption actually distinguishes two algorithms:
> xenc:EncryptedData / xenc:EncryptionMethod / @Algorithm
> The value is an identifier of a block encryption algorithm like http://www.w3.org/2001/04/xmlenc#aes128-cbc or http://www.w3.org/2001/04/xmlenc#tripledes-cbc.
> xenc:EncryptedKey / xenc:EncryptionMethod / @Algorithm
> The value is an identifier of an algorithm used for Key Transport. XML encryption currently recommends http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p, commonly used values include http://www.w3.org/2001/04/xmlenc#rsa-1_5.
> I assume the PMode parameter identifies the first use. There does not seem to be a parameter for the second one? When using WS-SecurityPolicy, it would be needed to select the correct policy, e.g. Basic128Sha256 versus Basic128Sha256Rsa15.
> (This is not to promote WS-SecurityPolicy, the ebMS3 approach of directly using the W3C Signature and Encryption parameters is actually more future-proof than WS-SecurityPolicy's identifiers, just to note that some implementers of ebMS3 will use security toolkits that are configured using WS-SecurityPolicy).
>
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