Fixed to catch the error output of the key check.
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@ -213,7 +213,7 @@ class IDF_Form_UserAccount extends Pluf_Form
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$tmpfile = Pluf::f('tmp_folder', '/tmp').$user.'-key';
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file_put_contents($tmpfile, $key, LOCK_EX);
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$cmd = Pluf::f('idf_exec_cmd_prefix', '').
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'ssh-keygen -l -f '.escapeshellarg($tmpfile);
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'ssh-keygen -l -f '.escapeshellarg($tmpfile).' > /dev/null 2>&1';
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exec($cmd, $out, $return);
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unlink($tmpfile);
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if ($return != 0) {
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