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3answers
45 views

Simplifying SMIME by re-using the Public & Private key across email accounts

I need to simplify (at the cost of security features) an SMIME deployment. How can I generate a CSR that reuses the same public and private key for more than one email address? In other words, I ...
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1answer
198 views

Detecting SMIME type using OpenSSL CMS

Is it possible to detect S/MIME content types (enveloped or signed) using OpenSSL CMS API? I would prefer to avoid pre-parsing S/MIME headers and let OpenSSL to detect whether message is signed or ...
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1answer
199 views

How do I determine S/MIME encryption used?

From what I understand it seems that S/MIME uses PKCS #7 which can handle various different types of encryption. How is the choice of encryption method made by the e-mail client and how do I know what ...
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0answers
12 views

Should an SMIME signing and encryption key have different expiration dates?

Assuming the client supports different keys, what is some rationale that should be considered for signing and encryption keys? For example, since the encryption key needs to be present on each device ...