[FS#786] Please, add support to ecdsa key type

[LEDE Bugs]

The following task has a new comment added:

FS#786 - Please, add support to ecdsa key type
User who did this - Mieszko Ślusarczyk (spitfire)

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It would be very useful for me - I'm trying to switch to [[https://github.com/ntrippar/sekey|sekey]] which would let me store my key in a more secure way, and it only supports ecdsa keys.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=786#comment3959