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From "Franz Forsthofer (JIRA)" <>
Subject [jira] [Commented] (CAMEL-7002) PGPDataFormat: restrict verifying public keys and allow several signatures
Date Wed, 04 Dec 2013 15:00:46 GMT


Franz Forsthofer commented on CAMEL-7002:

Hello Aki,

Suppose you have two signatures SigA and SigB in the encrypted data and let's suppose that
we have the correspondig two keys keyA and keyB also in the keyring. But we only want to allow
the keyB is used for the verification. The verifier hover detects first keyA and verifies
SigA and you return the information of keyA. Now in a next step we find out that keyA was
used for verification and we abourt the processing although there is a SigB which would not
have lead to the abortion.

Regards Franz

> PGPDataFormat: restrict verifying public keys and allow several signatures
> --------------------------------------------------------------------------
>                 Key: CAMEL-7002
>                 URL:
>             Project: Camel
>          Issue Type: Improvement
>          Components:  camel-crypto
>            Reporter: Franz Forsthofer
>            Assignee: Hadrian Zbarcea
>             Fix For: 2.12.3, 2.13.0
>         Attachments: 0001-PGPDataFormat-signatureUserIds-added.patch
> The contribution consists of two parts.
> The first part is about the verifier.
> During the signature verification with PGPDataFormat currently all public keys contained
in the public keyring are taken into account. So the current semantic is: Verify the signature
against all public keys in the keyring. IF you have a keyring with lot of public keys you
will not want that every identity represented by the public keys can sent to you a signature.
Normally you want to know from which identity the signature comes. Therefore I have introduced
the possibility to restrict the verifying publikc keys; I have introduced the parameter signatureKeyUserids
where you specify the Userids the publc keys must have in order to be allowed to verify a
> The second contribution is about the encryptor. Currently the encrypted part can contain
one signature from one private key. I added now the possibility that several several signatures
can be added from different private keys. The used private keys are defined by the values
of the new paramter signatureKeyUserids. This new functionality is especially useful to ease
the key renewal. For a certain time period you can sent messages containing the signature
from the old key and the new key to the receiver. 

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