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SFTP/SCP tests were failing in CI with WinCNG libssh2 since we first added such job. With `curl: (67) Authentication failure`. The reason is that the default `ssh-keygen` RSA private key format changed to OpenSSH (RFC4716) in 2018. libssh2 does not support this format with some of its crypto backends. Fix it by generating keys explicitly in PEM format as necessary via the `-m` option. This format is universally recognized for RSA keys. 2018-08-24: https://www.openssh.com/txt/release-7.8: OpenSSH format becomes default 2010-08-23: https://www.openssh.com/txt/release-5.6: `-m` option first supported This fixed the auth issue, just to reveal a known flakiness issue in libssh2 + WinCNG, causing: ``` curl: (2) Failure establishing ssh session: -8, Unable to exchange encryption keys ``` Ref: https://github.com/curl/curl/actions/runs/14000494428/job/39205633258?pr=16781#step:15:1796 Tracked here: https://github.com/libssh2/libssh2/issues/804 Mitigated in libssh2 tests by retrying them. Due to this, keep ignoring these test results. Also: - add an env to customize key format: `CURL_TEST_SSH_KEY_FORMAT` - display the generated format in the log. - GHA/linux: document the wolfSSH error code causing it to fail tests: ``` curl: (79) wolfssh SFTP connect error -1051 / WS_MATCH_KEY_ALGO_E / cannot match key algo with peer ``` Follow-up to |
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