[stunnel-users] Two certificates on same connection

hi,

I am into implementations and generally use stunnel with a certification provided by our third party connections in stunnel for encryption/ decryption both ways.

Recently we had a query from one of our vendors stating we must use one cert to encrypt which they will decrypt using the key provided by us and they will encrypt which must be decrypted using the key provided.

Keeping it simple we have below:

Client Key - clt.pem Client cert - clt.cer Vendor key - vndr.pem our ca certs - ca-cert.pem

Could anyone help me in understanding how do I leverage vendor key for decrypting and clt key for encrypting in stunnel.conf using the above certs. Many Thanks.