[Bug 1750633] Re: signer and verifier have been deprecated

[Robert Mader]

I'd really appreciate a backport of the fix. Some other distributions
shipping with paramiko 2.0 ship it already, for example mageia
(https://advisories.mageia.org/MGAA-2018-0077.html)

It affects everyone doing backups with duplicity over ssh, most notably
when using cronjobs. Probably quite a big group. Unfortunately it's not
enough to just set the log verbosity to error.

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https://bugs.launchpad.net/bugs/1750633

Title:
  signer and verifier have been deprecated

Status in Cursive:
  New
Status in paramiko package in Ubuntu:
  Confirmed

Bug description:
  The cryptography library has deprecated the use of signer and verifier
  as of version 2.0 (see
  https://cryptography.io/en/latest/changelog/#v2-0 for changelog).

  The cursive library uses signer and verifier, and should be updated to
  use sign and verify instead.

  The following is the deprecation warning:

  /opt/stack/cursive/cursive/signature_utils.py:139: DeprecationWarning:
  signer and verifier have been deprecated. Please use sign and verify
  instead.

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