Hi all,

With OpenSSL, can I create PKCS#7 CMS messages just using a pre-shared symmetric key?

I just need to package the secret with its encryption algorithm identifier, and the PKCS#7 envelope looks ideal for this.

The only additional data that I may wish to add to the message may be the symmetric key identity, which would be a proprietary identifer. Is there any standard compliant way within PKCS#7 to add application specific extensions such as this?

Thanks for any assistance,

Carl

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