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SSH Agent interface for Unix clients.
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Client interface for using private keys from an SSH agent running on the
local machine. If an SSH agent is running, this class can be used to
connect to it and retreive L{PKey} objects which can be used when
attempting to authenticate to remote SSH servers.
Because the SSH agent protocol uses environment variables and unix-domain
sockets, this probably doesn't work on Windows. It does work on most
posix platforms though (Linux and MacOS X, for example).
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Open a session with the local machine's SSH agent, if one is running.
If no agent is running, initialization will succeed, but L{get_keys}
will return an empty tuple.
@raise SSHException: if an SSH agent is found, but speaks an
incompatible protocol
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Close the SSH agent connection.
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Return the list of keys available through the SSH agent, if any. If
no SSH agent was running (or it couldn't be contacted), an empty list
will be returned.
@return: a list of keys available on the SSH agent
@rtype: tuple of L{AgentKey}
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Private key held in a local SSH agent. This type of key can be used for
authenticating to a remote server (signing). Most other key operations
work as expected.
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