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Currently the SSH block driver supports MD5 and SHA1 for host key fingerprints. This is a cryptographically sensitive operation and so these hash algorithms are inadequate by modern standards. This adds support for SHA256 which has been supported in libssh since the 0.8.1 release. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210622115156.138458-1-berrange@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Acked-by: Richard W.M. Jones <rjones@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>