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

[LEDE Bugs]

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FS#786 - Please, add support to ecdsa key type
User who did this: Baptiste Jonglez (bjonglez)
Status: Unconfirmed -> Researching

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=786