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Hey all,</div>
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I have a question similar to <a href="http://openssl.6102.n7.nabble.com/private-key-not-available-for-client-cert-cb-td79369.html" id="LPlnk630154">
http://openssl.6102.n7.nabble.com/private-key-not-available-for-client-cert-cb-td79369.html</a>, that I am actively following, but though it differs in detail.</div>
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What I want to achieve is the following:</div>
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My client applications runs inside a container and needs to establish a mutual TLS connection to a server.</div>
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The client certificate is available in the container.</div>
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The root certificate, as well as the client private key is not available inside the container, but stored in a HSM.</div>
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For sure the private key may never leave the HSM and also the root certificate should not.</div>
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The application cannot directly interfere with the HSM through standardized mechanisms as it is not accessible from inside the container.</div>
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For doing so a proprietary interprocess-communication is required.</div>
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I now want something like a "verify callback" and a "sign callback".</div>
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The "verify callback" would be needed in order to verify the server certificate against the root certificate. It seems to be easy using: <a href="https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_cert_verify_callback.html" id="LPlnk">https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_cert_verify_callback.html</a></div>
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I need the same, something like a "sign callback" also for the private key, when a signature is required during handshake. Such that requests from openSSL to sign something can be forwarded through the inter-process-communication into the HSM. So that the actual
signing happens there.</div>
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This would only be required during handshake. For the actual encryption symmetric keys can be used, such that the encryption takes place in the openSSL library, not in the HSM.</div>
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I assume I need to write a custom ENGINE, but failed with all my approaches.</div>
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Can someone give me brief hint on where to start and which API to look at first?<br>
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Thanks a lot!</div>
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Timo</div>
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