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curl/docs/cmdline-opts/key.d

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+Long: key
+Arg: <key>
+Protocols: TLS SSH
+Help: Private key file name
+Category: tls ssh
+---
+Private key file name. Allows you to provide your private key in this separate
+file. For SSH, if not specified, curl tries the following candidates in order:
+\&'~/.ssh/id_rsa', '~/.ssh/id_dsa', './id_rsa', './id_dsa'.
+
+If curl is built against OpenSSL library, and the engine pkcs11 is available,
+then a PKCS#11 URI (RFC 7512) can be used to specify a private key located in a
+PKCS#11 device. A string beginning with "pkcs11:" will be interpreted as a
+PKCS#11 URI. If a PKCS#11 URI is provided, then the --engine option will be set
+as "pkcs11" if none was provided and the --key-type option will be set as
+"ENG" if none was provided.
+
+If this option is used several times, the last one will be used.