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https://issues.apache.org/jira/browse/LOG4J2-3508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17538608#comment-17538608
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Volkan Yazici commented on LOG4J2-3508:
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[~rufusjwb], mind explaining me why do you want this to be included in the
Log4j core rather than maintaining it yourselves in a separate repository,
please? Organizations, users, etc. who want to benefit from your work can use
it from your repository in exactly the same way they would consume it from
Log4j as long as it is available with a compatible license in Maven Central.
> Add a signature appender to the log4j2 core
> -------------------------------------------
>
> Key: LOG4J2-3508
> URL: https://issues.apache.org/jira/browse/LOG4J2-3508
> Project: Log4j 2
> Issue Type: New Feature
> Components: Appenders
> Reporter: Simon Huang
> Priority: Minor
>
> h2. Goal
> Merge our implementation of a Signature appender into the log4j2 core.
> h2. What is a signature appender?
> Hello log4j2 contributors,
> I am a working student at Siemens and my superiours were looking for a way to
> add a signature to their logs. The solution that we came up with is an outer
> appender that works similar to the failover appender, i.e. it adds a
> signature and delegates the appending to another appender.
> You can see our solution at
> [github|https://github.com/simon-hng-smns/log4j2_signature_appender/tree/main]
> as wenn as an [example
> implementation|https://github.com/simon-hng-smns/log4j2_signature_appender/tree/example-implementation].
> We would appreciate any and all feedback, and hope you can guide us to
> necessary changes, in order to incorporate our appender.
> h2. How does it work?
> The SignatureAppender takes in an inner appender, which can now use the
> {{%sign}} PatternConverter.
> {code:xml}
> <Appenders>
> <SignatureAppender name="signatureAppender"
> signatureAlgorithm="SHA256withRSA"
> pathToKeyStore="signatureKeyStore.p12"
> keyStorePassword="password"
> >
> <Console name="console">
> <PatternLayout pattern="[%sign] %m%n"/>
> </Console>
> </SignatureAppender>
> </Appenders>
> {code}
> h3. Creating the signature
> The signature is created using the internal java class {{Signature}}, which
> gets a formatted message and the last signature and signs like this
> {code:java}
> Signature.update(message + lastSignature)
> {code}
> h3. In general the steps are the following:
> # SignatureAppender gets LogEvent creates the formatted message.
> # Using this formatted message and the lastSignature, a signature is created
> which we use to create a LogEvent with the signature as a property
> # This new LogEvent is then send to the inner appender, where it is used by
> the SignaturePatternConverter
>
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