It is possible to import a certificate when the ADMIN user has:
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A private key in PEM format.
The private key must not be password-protected. Fluid Topics accepts both RSA and EC private keys.
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A full certificate chain in PEM format.
The first certificate in the chain must correspond to the private key. Then, each successive certificate must sign the previous one, until there is a self-signed certificate. The chain can only have one certificate (when it is a self-signed certificate). To construct the chain, it is possible to concatenate several PEM files.
The private key and certificate chain must be either PKCS #8 or PKCS #1 encoded.