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OpenSSH Hardware Keys and `SSH_SK_PROVIDER` envvar (FIDO2 and U2F)

The OpenSSH tools use the $SSH_SK_PROVIDER environment variable to point to the middleware, though all tools that support security keys accept dedicated command-line or configuration options (e.g. ssh_config SecurityKeyProvider). This provider needs to be available for key generation and signing (e.g. pubkey authentication) operations.

$ SSH_SK_PROVIDER=/path/to/libsk-libfido2 …