On Sun, 4 Jan 2009, Thomas Bader wrote:
> At first sight, everything looks well. However, there's a log message
> which is a bit confusing:
>
> Jan  3 23:09:26 valmar dkim-filter[952]: 3C9D8342EEEF SSL
> error:04067069:rsa routines:RSA_EAY_PUBLIC_DECRYPT:pkcs1 padding too short
>
> (On successful verification, this is the _only_ logged message. In case
> of failed verification, a log line indicating "bad signature data"
> follows.)

The dkim-filter code will log errors that the OpenSSL library reports.  If 
you're getting successful verification, you can probably ignore this.

I'm not an expert about the data structures OpenSSL uses, but the error 
appears to mean the public key retrieved to verify a message was 
corrupted.  However, if it's verifying successfully then I suppose it was 
not corrupted enough to prevent completion of the verify operation.

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